Home Extensions QLD 2026 - Get Free Quotes

Home Extension Costs in QLD for 2026

Home extensions are the dominant residential building project type across Queensland for owners staying in their existing property and adapting it to meet changing needs. Pricing in 2026 sits at $90,000 to $150,000 for a basic 30 square metre single-storey extension, $130,000 to $220,000 for a standard 40 to 50 square metre extension, and $200,000 to $350,000 for a large 60 to 80 square metre extension. Second-storey additions run $200,000 to $500,000 or more depending on scope, Queenslander build-under conversions $80,000 to $200,000, and outdoor rooms or enclosed alfresco spaces $50,000 to $120,000. Per-square-metre rates work out at $2,500 to $4,500 for standard construction and $4,500 to $7,000 for premium specifications.

The cost differential between an extension and a comparable new home build of the same floor area is real and worth understanding. Extensions cost more per square metre than new construction (often 30 to 60 percent more) because of the integration with existing structure, the more constrained working conditions, the design effort to make the new work look right with the old, and the practical complexity of building while the homeowner continues to live in the property. Property owners considering extension versus knock-down rebuild need to compare both options with site-specific pricing rather than rule-of-thumb assumptions. Knock-down rebuild often produces better outcomes for properties needing substantial reconfiguration, while extension typically produces better outcomes where the existing home is well-suited to the family's needs and only needs additional space.

Cost variation between quotes on the same nominal extension scope typically reflects three areas of difference. The first is the actual scope, with subtle differences in what is included for demolition, integration with existing services, and finish replacement in adjacent existing rooms producing meaningful price gaps. The second is the structural assessment of the existing home, with quotes that include comprehensive structural review and any required underpinning, footing replacement, or wall reinforcement landing materially higher than quotes that assume the existing structure is adequate without checking. The third is finish specification within the extension itself, where premium fixtures, joinery, flooring, and tiling can add $30,000 to $80,000 across a typical 50 square metre extension compared to budget specification.

This guide concentrates on residential extensions and covers both the building scope and the planning context across Queensland. Related building work has its own dedicated guides covering general building, granny flat construction as the standalone alternative to extension, renovation services for non-extension residential work, concreting for slabs and footings, excavation and earthmoving for site preparation, and demolition for the partial demolition that often precedes substantial extensions. Specific finish and trade scopes have their own guides including bathroom and kitchen renovation work that often forms part of extension projects, plus decking for outdoor space integration.

What an Extension Includes - Scope of Work

A complete extension project encompasses planning approval, design, structural engineering, partial demolition where required, site preparation, footings and slabs, frame and roof, external cladding, windows and doors, internal lining, electrical and plumbing services, fit-out of new rooms (kitchens, bathrooms, wardrobes, joinery), finishes (flooring, painting, tiling), and integration with the existing home. The scope is essentially a small house build attached to the existing home, with the additional complexity of making the new work blend with the old in both function and appearance. A typical 50 square metre single-storey extension engages a head builder coordinating perhaps a dozen trade specialties across a 14 to 24 week program from site mobilisation to handover.

Standard inclusions on a typical extension scope cover the new building shell (slab or suspended floor, frame, roof, external cladding, windows, doors, insulation), the new fit-out (joinery, kitchen and bathroom where applicable, internal doors, trim, flooring, painting, electrical and lighting), the integration with the existing home (cutting in to existing walls, modifying or extending existing services, finishing the joining surfaces), and the basic external work (extension to existing patios or paths where necessary, restoration of disturbed garden areas). The inclusion list and quality standard are where extension quotes diverge substantially, with carefully written quotes specifying brand and product where finish standard matters and generic quotes leaving the specification open to interpretation.

Common exclusions or extras on standard quotes include the council planning approval cost where required (typically $1,500 to $8,000 in fees plus consultant time), the building approval and Form 16 inspection costs ($2,000 to $5,000), structural engineering for the design ($2,500 to $8,000 depending on complexity), service upgrades to the existing home where the additional load requires them, finishes in adjacent existing rooms that will be modified or affected by the work, painting of the entire existing home (commonly excluded but often desirable when the extension is complete), and any landscaping beyond basic garden restoration. Each of these items can add $5,000 to $30,000 to the project depending on scope.

Site-specific scope items that warrant explicit confirmation at quoting include the structural review of the existing home (essential for second-storey additions and recommended for any extension making substantial connections to the existing structure), assessment of the existing services capacity (electrical and plumbing capacity often need upgrade to support additional rooms), termite management for the new work and any reinstatement of disturbed termite barriers, asbestos assessment on pre-1990 homes where existing materials will be disturbed during the work, and any specific finishes the property owner wants matched to the existing home for visual coherence. Quality builders address these items methodically during their initial site inspection rather than treating them as variations after contract signing. Specialist carpentry work for matched timber elements and built-in wardrobes for new bedrooms are commonly part of the broader extension scope.

Extension Types - Single-Storey, Second-Storey, Build-Under

Single-storey extensions are the most common extension pattern across Queensland and add new floor area at the same level as the existing home (or on a defined adjacent level for sloping sites). The typical configurations include rear extensions adding living space, bedrooms, or master suite to the back of the house, side extensions widening the home where block dimensions allow, wrap-around extensions combining rear and side work, and front extensions adding entry presence (less common because of front setback requirements). Single-storey extensions work well on most suburban Queensland blocks, with the constraints typically being block dimensions, side and rear setback rules, and any character or heritage overlay considerations.

Second-storey additions involve building a new upper floor on top of the existing single-storey home. The work is substantially more complex than single-storey extension because the existing structure (footings, walls, roof) needs to be assessed for structural capacity to carry the additional load, and either confirmed adequate or upgraded to suit. The existing roof is removed and replaced with the new upper floor, and a new roof above the upper floor. Internal stair construction, services routing through the existing home to serve the new upper floor, and substantial protection of the existing home during the period when the roof is removed all add to project complexity. Second-storey additions typically take 24 to 40 weeks total and run $200,000 to $500,000 or more depending on size and structural complexity, with the work substantially disrupting the existing home for months.

Queenslander build-under is a Queensland-specific extension type using the substantial unused space below the elevated main floor of traditional Queenslander homes. Many Queenslanders sit on stumps with two to three metre clearance below the main floor, originally used as open laundry, storage, or workshop space. Build-under conversion encloses this space with new walls, installs insulation and waterproofing, completes services, and fits out the resulting rooms as living areas. Pricing typically runs $80,000 to $200,000 depending on scope, with the lower end covering basic build-under for additional bedrooms and storage and the upper end covering substantial conversions including new bathrooms, kitchens, or self-contained apartments. The build-under approach often produces excellent value because the existing structure provides much of the building shell at no cost.

Outdoor extensions including covered alfresco spaces, sunrooms, conservatories, and outdoor rooms with various levels of enclosure occupy a useful middle ground between full extensions and outdoor structures. Covered patios with simple roof structure but no enclosure are the cheapest option at typically $20,000 to $50,000, with detailed pricing on our pergola builders guide for traditional pergola structures. Outdoor rooms with full enclosure (walls, windows, ceiling) but without complete climate control sit at $50,000 to $90,000. Sunrooms with complete climate control and living-grade finish run $80,000 to $120,000 and effectively function as additional internal living space. The choice between these options depends on how the space is intended to be used and the climate conditions in the specific Queensland location.

QLD Planning and Council Requirements

Building approval under the Building Act 1975 (Qld) is required for all extension work and is typically obtained from a private certifier who reviews the design against the National Construction Code, the Queensland Development Code, and any specific overlays applicable to the property. The certifier issues the building approval, performs Form 16 inspections at key construction stages (footings, frame, plumbing rough-in, lock-up, final), and issues the Form 21 certificate of completion at handover. Building approval cost typically runs $2,000 to $5,000 across the project. The Australian Building Codes Board publishes the National Construction Code that sets the technical requirements for the construction.

Planning approval requirements vary substantially by council and zone. Many extensions on standard residential lots in non-overlay zones can proceed as Self-Assessable development under the Planning Act 2016 (Qld) and individual council planning schemes, requiring only the building approval. Extensions that exceed certain size thresholds, are in character or heritage overlay zones, are in flood-prone or bushfire-prone overlays, are in low-density residential zones with specific design controls, or trigger any other planning code provisions require Code-Assessable or Impact-Assessable planning applications. The planning application process adds 6 to 16 weeks to the project program depending on council backlog and any objections received during public notification on Impact-Assessable applications.

Brisbane City Council's planning controls under Brisbane City Plan 2014 are the largest single planning context in Queensland and apply to a substantial portion of the state's extension activity. Standard low-density residential zones support most extensions through Self-Assessable development pathways, while character zones, heritage zones, low-medium density residential zones near transit, and various overlay zones apply additional controls. Other Queensland councils maintain similar planning regimes adapted to local conditions. Property owners considering extension work should confirm the planning context of their specific lot through the council planning website or via a town planner before committing to a design, particularly for substantial extensions or work in any overlay zone.

Building approval timing is typically 2 to 6 weeks from submission to issue on a properly documented application, while planning approval where required runs 6 to 16 weeks. Extensions starting from concept through to construction commencement typically take 4 to 9 months total when planning approval is required and 2 to 4 months when only building approval is required. Property owners need to factor this approval lead time into the project program rather than expecting construction to commence immediately after engaging a builder. Council infrastructure charges may apply to substantial extensions, with costs varying by council and by the extension's specific impact on infrastructure capacity. These charges can add $2,000 to $15,000 to the project for substantial work.

Character Zones and Overlays

Brisbane's Traditional Building Character Overlay applies to pre-1947 timber-and-tin houses across many inner suburbs and significantly constrains extension options. The overlay aims to preserve the character of these properties at street view, with controls on demolition, additions visible from the street, and modifications to character-defining elements. Extensions in character overlay areas typically need to be located behind the existing home rather than in front, with design responses that preserve or enhance the original character rather than overshadowing it. Side extensions on character properties are constrained by setback and visibility rules, and second-storey additions on Queenslanders often require substantial design effort to maintain character at street view. Compliance with the overlay typically adds $10,000 to $30,000 to project cost compared to non-overlay equivalent work.

Heritage overlays apply to properties listed on the Queensland Heritage Register under the Queensland Heritage Act 1992 and to other locally significant properties. Heritage controls are substantially stronger than character controls and may effectively prevent substantial extension work or impose detailed design requirements that produce a higher-cost outcome. Property owners purchasing heritage-listed properties or those in heritage precincts should confirm the implications for any planned extension work before completing the purchase, as heritage controls can substantially affect the property's adaptability over time. Heritage architects and consultants specialise in this work and are typically engaged early in the project to help navigate the requirements.

Flood-prone and bushfire-prone overlay areas apply to properties in mapped flood and bushfire risk zones, with specific design and construction requirements addressing the relevant risks. Flood-prone areas typically require minimum floor levels above the defined flood event level, which can produce substantial additional structural and access cost. Bushfire-prone areas require construction to specific Bushfire Attack Level (BAL) ratings under AS 3959, with construction cost increasing with the BAL rating. Properties at BAL-29 or BAL-40 typically pay $20,000 to $60,000 more for the additional construction requirements compared to non-bushfire equivalent work, while properties at BAL-FZ (flame zone) face substantially more involved construction or in some cases may not be able to be extended further.

QBCC Licensing and Builder Selection

Extension construction valued at $3,300 or more requires the head builder to hold an appropriate QBCC licence under the Queensland Building and Construction Commission Act 1991. The relevant licence classes are Builder Open (covering all residential and commercial building work) and Builder Low Rise (covering buildings up to two storeys, classes 1 and 10), both of which authorise extension construction. Specialist trade subcontractors operate under their own QBCC trade licences for their specific trade scope. Property owners can verify any builder's QBCC licence status, financial category, and disciplinary history free of charge through the QBCC online register before engaging them.

The Home Warranty Scheme operated by QBCC provides essential insurance protection for residential building work above the licensable threshold including extension construction. Cover includes non-completion of work due to insolvency, death, or licence cancellation of the builder, plus defective work cover for specified periods following completion. The premium is paid by the builder at contract signing and is required before work commences. For extension work, defective work cover applies for six years from completion for structural defects and twelve months for non-structural defects. Property owners signing extension contracts should specifically confirm Home Warranty Scheme cover is included with the QBCC certificate number provided. Builders unable or unwilling to issue the certificate should be approached cautiously.

Builder selection for an extension warrants particular attention because the work combines new construction with substantial integration into the existing home, and quality differences between builders produce substantial differences in finished outcome. Specialist extension builders with strong track records on similar properties typically deliver better results than generalists adding extension work to broader scopes. Reviewing recent completed extensions from each shortlisted builder, ideally with site visits to talk with previous clients about the experience, provides a meaningful basis for selection beyond pricing alone. Three to four written quotes from QBCC-licensed builders who have all visited the site provides the cost benchmark. Standard contract templates compliant with the Domestic Building Contracts Act 2000 are available through the QBCC website.

Designing the Extension

Extension design quality determines whether the finished work feels like an integral part of the home or an obviously bolted-on addition, and the difference is more about design effort than construction cost. Quality extension design considers the existing home's proportions, materials, window patterns, roof lines, and finish details, then designs new work that complements rather than competes with the existing. The new work doesn't need to perfectly replicate the existing (and often shouldn't, particularly on properties where the original architectural style is dated), but the relationship between old and new should feel intentional and harmonious rather than accidental. Architects and experienced building designers contribute substantially to good outcomes by working through these design considerations methodically rather than producing generic floor plans.

Floor plan integration matters as much as exterior aesthetics. The extension's relationship to existing rooms, the circulation between old and new spaces, the placement of doorways and openings, and the visual continuity through living areas all affect how the finished home functions for daily use. Common design problems on poorly-considered extensions include awkward circulation through small linking corridors, mismatched ceiling heights at the join between old and new, visible joins between floor finishes that highlight the addition, and natural light asymmetries where the new work extracts light from existing rooms or fails to bring adequate light into the new space. Quality designers consider these factors at concept stage and adjust the design to produce coherent outcomes.

Material selection on extensions typically involves three approaches. Matching materials replicate the existing home's external finishes (weatherboards, render, brick, roofing) to produce a continuous appearance suggesting the extension was always there. Complementary materials use different but harmonious external finishes that mark the extension as new while sitting comfortably with the existing. Contrasting materials make the extension visibly different from the existing, often using contemporary finishes like cement-fibre cladding (James Hardie Linea, Stria, or Axon are common in QLD), Colorbond cladding, or rendered finishes against a traditional weatherboard or brick original. Each approach is valid, with the choice driven by the property's character, the homeowner's preference, and any council overlay requirements.

Windows, doors, and natural light deserve specific design attention on extensions because of their substantial contribution to liveability and energy efficiency. Window orientation following sound passive design principles (north-facing living areas where possible, smaller and shaded windows on east and west facades, openable windows for cross-ventilation) produces homes that feel comfortable across the Queensland year without excessive reliance on air conditioning. Major Australian window brands including Trend Windows, Stegbar, A&L, Bradnam's, and others supply quality residential systems suited to Queensland conditions. Window selection also affects building approval compliance through the energy efficiency provisions of the National Construction Code, with the specifying details working back from required performance through the design's window-to-wall ratio.

Living Through the Extension Build

Living in the home through an extension build is the practical reality on most extension projects and warrants planning before construction commences. The construction noise, dust, and disruption typically affect daily life for the duration of the build, with the most intensive disruption during demolition (where existing walls are removed for integration), structural work (where existing roofs, walls, or floors are modified), and services work (where existing electrical, water, and drainage systems are interrupted to extend into the new space). Property owners with the means to relocate temporarily during the most intensive 2 to 4 week period often find the project substantially less disruptive, while owners staying through the full build need to accept noise and dust as part of daily life for several months.

Site management practices on a quality extension build include daily clean-up of work areas, dust isolation barriers between construction areas and lived-in areas, weather protection of any internal spaces exposed to the outdoors during the work, and clear communication between the builder and the homeowner about which days will involve substantial disruption. Reputable builders take site management seriously and maintain a clean, orderly site rather than working around accumulated debris and tools. Property owners should expect to see daily housekeeping and prompt response to any specific concerns raised about site conditions, with the builder's responsiveness being a useful indicator of how well the broader project will be managed.

Practical living arrangements during extension work include closing off affected areas with temporary partitions, arranging temporary kitchen or bathroom facilities where the existing facilities are out of action, ensuring vehicle access through any construction-affected driveway, securing valuables and personal effects against site access, and maintaining appropriate insurance cover during the construction period. Homeowner insurance policies typically have specific provisions or exclusions for properties under substantial construction, and property owners should confirm coverage with their insurer before work commences. Builders' contract works insurance covers the construction work itself but does not cover the existing home's contents or structures that are not part of the construction scope.

Service Connections and Upgrades

Service capacity assessment on the existing home is an important early step in extension planning because additional rooms typically increase load on the electrical, plumbing, hot water, and HVAC systems. Existing electrical service capacity is the most common limiting factor, with older homes commonly having 60 to 80 amp main service that is barely adequate for current loads and substantially constrained for additional rooms. Service upgrade to 100 amp single-phase or three-phase service requires coordination with Energex for South East Queensland or Ergon Energy for regional Queensland, and typically costs $2,000 to $6,000 for the service upgrade plus internal wiring upgrades to suit. Properties on outdated wiring (cloth-covered cable, aluminium wire, knob-and-tube) may require substantial rewiring as part of the extension scope.

Plumbing capacity for additional rooms depends on the size of the existing water service, the condition of existing pipework, and the specific demand of the new rooms. Adding a single bathroom to an extension typically does not exceed the capacity of standard suburban water service, but adding multiple bathrooms or a substantial new wing can drive water service upgrades. Existing pipework condition matters because connecting new pipework to deteriorated original galvanised or aged copper pipework produces flow constraints that affect both old and new bathrooms. Many extension projects warrant partial or full re-plumb of the existing home as part of the broader scope, with detailed pricing on our plumbing services guide. Hot water capacity may also need upgrade, with detailed scope on our hot water system installation guide.

Heating, cooling, and ventilation upgrades commonly accompany substantial extensions to maintain comfort across the expanded floor area. Existing split system air conditioning may not provide adequate coverage for the extended space, with options ranging from additional split systems to replacement with ducted systems serving the whole expanded home. Ducted ventilation in extensions requires careful planning of duct routes through the new and existing structures, and is best designed at the structural design stage rather than retrofitted late in the project. Insulation specification across the extension to current National Construction Code requirements typically delivers better thermal performance than the existing home; extensions can be designed to a higher standard than the existing without requiring upgrade of the existing, but combined upgrade often produces better overall outcomes. Detailed scope for related electrical services work commonly forms part of the broader extension trade scope.

Extension Costs in Greater Brisbane and SE QLD

Greater Brisbane extension pricing varies substantially across the metropolitan area driven primarily by character zone overlays and the property age and type. Inner Brisbane character home extensions running through the Traditional Building Character Overlay constraints typically run $4,000 to $6,000 per square metre for standard work and $5,500 to $8,000 per square metre for premium work, reflecting both the design effort required to comply with the overlay and the typical premium specification expected on inner suburb work. Middle ring suburb extensions on standard residential properties run $3,000 to $5,000 per square metre depending on specification. Outer suburban extensions across Logan, Ipswich, Moreton Bay, and Redland typically run $2,500 to $4,500 per square metre, with the lower end available on simple straightforward additions to modern brick veneer homes.

The Gold Coast and Sunshine Coast follow similar pricing patterns to Brisbane suburban rates, with coastal property values supporting a higher proportion of premium and architectural extension work than typical Brisbane suburban projects. Hinterland and acreage properties in both regions support more elaborate extensions on larger blocks, with substantial extensions on prestige rural-residential properties running $4,000 to $7,000 per square metre. Coastal properties within the cyclone wind region from approximately Maryborough northwards face additional engineering and construction requirements that add to project cost. Coordinating extension construction with related work such as pool construction, landscaping, and decking often produces better overall outcomes than treating each as separate engagements.

Regional Queensland Extension Pricing

Toowoomba and the Darling Downs region offer extension pricing slightly below Brisbane outer suburban rates reflecting the lower cost base and the established local trade market. Standard 50 square metre single-storey extensions typically run $115,000 to $180,000. Bundaberg, Hervey Bay, and the Wide Bay region offer broadly similar pricing with stable contractor supply across most of the year. Tropical North Queensland extension construction in Cairns, Townsville, Mackay, and Rockhampton operates within different engineering constraints than southern Queensland because of cyclone wind loading requirements under AS 1170.2. Cyclone-rated construction adds modestly to material specifications and engineering requirements, with standard extensions typically running $130,000 to $220,000 for a 50 square metre single-storey addition reflecting the additional engineering scope.

Mining-influenced regional centres including Mount Isa, Gladstone, Emerald, and the Bowen Basin towns produce extension market dynamics that fluctuate with mining activity cycles. During strong mining cycles, contractor demand from industrial and commercial work draws labour away from residential extension work, raising local rates and extending lead times by months. During softer cycles, residential capacity becomes available and rates moderate. Property owners in these regions benefit from understanding the local market when planning major extension work. Remote rural areas of western Queensland, the Cape York peninsula, and the Gulf country involve substantial freight and travel implications, with extension construction typically running $30,000 to $60,000 above urban benchmarks reflecting freight and accommodation cost. Property owners in these regions often combine extension with other significant property work such as roof restoration, painting, and structural rectification to share mobilisation costs.

What to Look For in Extension Quotes

A detailed quote for extension construction should set out the scope clearly with floor plan and gross floor area, the structural engineering approach and any existing structure modifications required, the specification of finishes by room with brand and product names where relevant, the inclusions and exclusions list with each item explicitly identified, the planning and building approval responsibility, the service upgrade scope and any related utility connection costs, the QBCC licence number of the builder, the financial category, the QBCC Home Warranty Scheme premium, and the payment milestones tied to verifiable construction stages. Quotes vague on any of these elements should be revised before comparison.

Site visits matter substantially for accurate extension quoting because the work depends on existing conditions that cannot be assessed from photographs alone. The structural condition of existing footings and walls, the routing of existing services, the condition of existing roof and external finishes, the access conditions for construction equipment, and the practical constraints of building while maintaining the existing home's occupancy all need on-site assessment. Reputable builders expect to spend 60 to 120 minutes on site for a substantial extension quote, take photographs and measurements, and welcome the questions a property owner raises during the inspection. Quotes that arrive without a substantial site visit should be approached cautiously.

Before signing any contract for extension construction, key items to verify include the QBCC licence is current and appropriate to the scope through the QBCC online register, the financial category permits the contract value, the QBCC Home Warranty Scheme premium is included, the public liability insurance certificate is current and provides minimum $5 million cover, references from recent comparable completed extensions are provided and ideally followed up, site visits to recent completed projects are offered to verify quality, and the contract terms comply with the Domestic Building Contracts Act 2000. The contract should provide for variations through documented variation orders rather than verbal scope changes during the work, with the cost impact specified in writing. Statutory consumer guarantees under the Australian Consumer Law administered by the Australian Competition and Consumer Commission apply regardless of contract terms. Tradies looking for work in this trade and adjacent specialties can find current opportunities through our builder jobs, carpenter jobs, bricklayer jobs, and residential renovation jobs pages, plus broader Queensland opportunities through the QLD tradie job leads board.

Compliance, Warranty, and Long-Term Value

Compliance documentation on extension construction in Queensland produces the trail that protects the property owner through subsequent ownership and any future insurance, warranty, or sale arrangement. The contract documentation, the QBCC Home Warranty Scheme certificate, the engineer's design and certification, the council planning approval where required, the building approval and Form 16 inspection records, the service connection certificates from each utility, and the Form 21 final certificate at completion together form the project documentation set. Property owners should retain all documentation indefinitely with the property records, with copies provided to the conveyancer at any subsequent property sale and to insurers for property insurance purposes. Documentation gaps frequently surface at conveyancing inspections and can delay or compromise property sale.

Warranty cover on extension construction combines the QBCC Home Warranty Scheme cover (six years for structural defects, twelve months for non-structural defects), the builder's own workmanship warranty (typically two to seven years on items not covered by the QBCC scheme), the manufacturer warranties on supplied products and appliances, and the statutory consumer guarantees under the Australian Consumer Law. Property owners should retain all warranty documentation including product registration cards and contractor warranty letters for the duration of the relevant warranty periods. Defects emerging within the warranty period should be raised promptly with the relevant warranty provider, with documented written notification rather than verbal complaints providing the basis for any subsequent dispute resolution.

The economics of extension construction as an investment in property value work most favourably when the project is designed and specified to support long-term ownership and the property's relationship to its market segment. Extensions that take a 3-bedroom home to 4-bedroom configuration in a 4-bedroom suburb typically deliver strong value because the extended home matches market expectations. Extensions that push a property well beyond its suburb's typical configuration may not recover the full extension cost at sale. Premium specification on extensions in suburbs where premium homes are common delivers value; the same specification in modest suburbs may not. Quality design and construction produce extensions that perform well for 30 to 50 years with reasonable maintenance, while poorly designed and built extensions can require substantial rectification within 10 to 15 years. Three formal written quotes from QBCC-licensed builders who have all visited the site provides the basis for selecting the operator whose scope, approach, and pricing best suits the project. Post your extension job on The Quote Yard to connect with QBCC-licensed Queensland builders who provide site-assessed quotes for your specific project.