Underpinning Services QLD 2026 - Get Free Quotes

Underpinning Costs in QLD for 2026

Underpinning is the engineering trade that strengthens or extends the foundations of an existing building when the original footings can no longer adequately support the structure. The work is typically driven by foundation movement that has produced visible distress in the building above (cracking walls, sticking doors, sloping floors), with the underpinning rectifying the failed support and restoring stable foundation conditions. Pricing in 2026 sits at $2,000 to $5,000 per pier for mass concrete underpinning, $3,000 to $6,000 per zone for resin injection, $1,500 to $4,000 per pier for screw piles, and $2,500 to $5,500 per pier for helical piles. Project totals run $8,000 to $80,000 or more depending on scope.

The underpinning project as a whole always involves more than just the underpinning work itself. Geotechnical investigation by a qualified engineer identifies the soil conditions and the cause of the foundation movement, typically costing $1,500 to $4,000. Structural engineering design specifies the underpinning methodology, pier locations, and load transfer details, typically costing $2,500 to $8,000. Council building approval under the Building Act 1975 (Qld) is typically required, adding $1,000 to $3,000 in fees plus certifier scope. The engineering and approval scope is essential rather than optional; underpinning work without proper investigation and design produces unreliable outcomes and creates substantial risk of further movement after the work is complete.

Cost variation between quotes on the same nominal underpinning scope typically reflects three areas of difference. The first is the engineering investigation, with quotes that include comprehensive geotechnical investigation and detailed structural design landing meaningfully higher than quotes that assume cookie-cutter approaches without site-specific analysis. The second is the underpinning method recommended, with mass concrete, resin injection, and pile-based options producing different costs and different outcomes for the same nominal foundation problem. The third is the project scope, with quotes that address the full extent of foundation distress versus quotes that propose minimal intervention producing fundamentally different project sizes. Underpinning is one of the building trades where the cheapest quote frequently produces the worst outcome, because inadequate scope produces failed rectification and the need to do the work again.

This guide concentrates on residential underpinning and covers both the trade scope and the engineering and regulatory framework specific to Queensland. Related building work has its own dedicated guides covering general building, concreting for the broader concrete work involved in underpinning, excavation and earthmoving for the substantial excavation involved in mass concrete approaches, building inspection for the assessment work that often identifies the need for underpinning, drainage for the corrective drainage work that frequently accompanies underpinning, and retaining wall construction for the related earth-retention work on sloping sites.

What Underpinning Is and When It's Needed

Underpinning extends or strengthens the existing footings of a building by transferring load to deeper or wider foundation elements. The original footings of most Queensland residential buildings are designed to bear on the soil immediately beneath them, with depth and width specified to suit the soil's bearing capacity and reactivity at the time of construction. When something changes (the soil moves, water gets in, trees take moisture out, or the original footings prove inadequate for actual conditions), the building above can settle, tilt, or move differentially, producing the visible distress that prompts underpinning consideration. The underpinning work creates new foundation elements that bypass the failed soil or that distribute load to deeper stable layers.

Common causes of foundation movement in Queensland include reactive clay drying and wetting cycles producing seasonal movement on M and H class sites under AS 2870, water damage from leaking plumbing, blocked stormwater, or poor surface drainage saturating soil under footings, tree root activity drawing moisture from foundation soils causing differential drying, original construction defects where footings were undersized for the actual soil conditions, fill settlement under sections of the building that were built on uncompacted fill, and erosion or undermining from external causes. Quality geotechnical investigation identifies the specific cause and informs the most appropriate underpinning method for the situation rather than applying a generic approach.

The decision to underpin involves cost-benefit analysis that the property owner needs to work through with the engineer's input. Minor settlement that has stabilised may be acceptable to live with, particularly where the visible distress is cosmetic rather than structural. Active ongoing movement requires intervention because the distress will worsen over time, eventually reaching the point where rectification is much more expensive or where the building is no longer safely habitable. Insurance considerations also matter; foundation movement damage may be covered under home insurance policies in some circumstances (typically sudden water damage events) but not in others (gradual reactive clay movement is commonly excluded). The engineer's investigation typically informs both the technical underpinning approach and the insurance claim positioning.

Timing of underpinning work is generally not urgent in the days-to-weeks sense but is meaningful in the months-to-years sense. Foundation movement that has been progressing for years rarely accelerates suddenly, so property owners typically have time to commission proper investigation and engineering before committing to a contractor. Most underpinning projects complete within 6 to 12 months from initial concern through completion, with the geotechnical investigation, engineering design, council approval, and trade scheduling all consuming portions of the timeline. Acting promptly avoids the additional damage that progressive movement produces and the inflation of project scope as cosmetic damage becomes structural damage requiring more substantial rectification.

Signs Your House May Need Underpinning

Diagonal cracks in brick or render walls running typically from corners of windows and doors, becoming wider toward the top, are a classic sign of foundation movement. Brick walls show stepped cracks following the mortar joints, while rendered surfaces show smoother diagonal cracks that may close in some seasons and open in others. Hairline cracks that have stabilised are typically less concerning than wider cracks (greater than 5 millimetres) that are continuing to move. Cracks that consistently open and close with seasonal soil moisture cycles indicate active reactive clay movement. Property owners noticing these crack patterns should commission a building inspection or engineer's assessment rather than simply patching the cosmetic damage; the cracks indicate underlying structural movement that will continue regardless of cosmetic repair.

Doors and windows that stick, jam, or won't close properly indicate frame distortion typically caused by foundation movement. Internal doors showing inconsistent gaps between door and frame at the top versus the bottom, external doors that catch on jambs that previously cleared cleanly, and windows that won't slide smoothly all suggest foundation-induced frame movement. Cosmetic adjustment (planing the door, adjusting the latch, lubricating the slide) provides temporary relief but doesn't address the underlying cause; the doors and windows will continue to drift out of alignment as long as the foundation movement continues. Property owners should treat door and window issues as potential symptoms of foundation problems rather than unrelated maintenance issues.

Sloping or uneven floors indicate substantial foundation movement and warrant prompt assessment. Floors that have always been slightly uneven (typical in older homes built before precise levelling was standard) are different from floors that have noticeably moved over time. A spirit level run across floors in different rooms can identify localised slopes that suggest specific zones of foundation distress. Marbles or balls rolling consistently in one direction across floors indicate substantial differential movement. Tiled floors are particularly revealing because the rigid tile assembly cracks rather than absorbs the movement, with cracked or broken tiles in patterns matching foundation distress lines providing visible evidence. Floor movement of more than 20 millimetres across a typical room is substantial and typically warrants engineering investigation.

Visible separation between the building and adjoining structures (chimneys pulling away from the main wall, roof structures separating from wall plates, exterior cladding gaps growing), water penetration following crack patterns in external walls, and visible foundation movement at the slab edge or stump bases all indicate substantial foundation distress requiring engineering attention. Property owners should commission a building inspection if any of these signs are present, with the inspector's report typically identifying whether engineering investigation is needed. Many home insurance policies cover building inspection or engineer's report fees as part of claim documentation, particularly where the movement is suspected to result from a covered event (storm damage, plumbing leak, neighbouring excavation work).

Underpinning Methods - Mass Concrete, Resin, and Piles

Mass concrete underpinning is the traditional method and remains the dominant approach for residential underpinning in Queensland. The work involves excavating sections of soil beneath the existing footing, typically in sequenced bays of 1 metre length to maintain stability of the surrounding soil, and pouring concrete to extend the footing downward to a deeper bearing layer. The new mass concrete pier supports the footing above and transfers load to deeper soil. Standard mass concrete underpinning extends footings 0.5 to 2 metres deeper, depending on engineering design and the depth of stable bearing soil. Pricing of $2,000 to $5,000 per pier covers excavation, concrete supply and pour, formwork, and reinstatement. Mass concrete suits the majority of residential underpinning scopes but is the most invasive method, requiring substantial excavation around the building and extended construction time.

Resin injection underpinning uses expanding polyurethane resin injected at strategic points beneath the footing to lift and stabilise the foundation soil and transfer load to deeper layers. Mainmark Teretek is a well-known proprietary resin system used in Australia, with similar products available from other suppliers. The resin is injected through small ports drilled through the slab or footing, expands rapidly (within seconds), and cures to a stable load-bearing material within minutes. Resin injection is suited to specific failure modes including soft fill or compressible soil under the footing, and is less suited to gross structural failure where mass concrete or piles are the appropriate response. The substantial advantages of resin injection are minimal excavation, fast completion (often 1 to 3 days for whole-house work), and low disruption to landscaping and surrounds, with pricing of $20,000 to $60,000 for whole-house coverage where the method is suited.

Screw piles use steel piles with helical (screw-thread) plates at the lower end, driven into the ground by hydraulic torque equipment until the pile reaches the required bearing capacity in deeper stable soil. Once driven, the pile is connected to the existing footing through a pile cap or load transfer detail, with the load now bypassing the failed soil and transferring to the deeper bearing layer. Screw piles work well on sites where deep stable soil is available but the surface soils are inadequate, including reactive clay sites where the deeper soil profiles are more stable than the surface clay. Pricing of $1,500 to $4,000 per pier reflects the relatively quick driving process and the modest excavation required at the pile head. Quality screw pile work is supported by load testing of representative piles to verify the design capacity.

Helical piles are similar to screw piles but typically use larger-diameter piles with multiple helical plates, providing greater load capacity and reaching deeper bearing layers. The driving process uses similar hydraulic torque equipment but applied to substantial pile sections. Helical piles suit larger structures or sites with deeper unstable layers requiring more substantial pile reach, with pricing of $2,500 to $5,500 per pier reflecting the larger pile size and the more substantial driving equipment. Helical piles are less common than mass concrete or screw piles on standard residential underpinning but provide a viable alternative on properties where the engineer's analysis identifies their suitability.

Beam and base underpinning uses a reinforced concrete beam constructed below the existing footing connecting to bearing piers at intervals, distributing load across the beam to the piers. The approach works well where the original footing is itself deteriorated and benefits from the stiffening effect of the new beam, or where mass concrete piers at intervals work better than continuous footing replacement. Mini piles (small diameter driven or bored piles) provide another variation suited to access-constrained sites where standard pile equipment cannot be used. Each method has specific suitable applications, and the engineer's recommendation should be based on the specific site conditions, structural requirements, and access constraints rather than a generic preference for any particular method.

Geotechnical Investigation and Engineering Design

Geotechnical investigation establishes what's actually beneath the building and what the soil conditions are doing. Standard residential geotechnical investigation involves drilling 2 to 4 boreholes around the perimeter of the building, taking soil samples at depths matching the existing footings and to deeper levels potentially relevant to underpinning, performing field and laboratory tests to characterise the soils, and documenting the findings in an engineer's geotechnical report. The investigation identifies the soil profile (clay, sand, fill, rock layers), the soil's reactivity and bearing characteristics, the depth to stable bearing soil, the moisture content and any evidence of recent moisture changes, and any factors specific to the site (groundwater, root activity, fill content). Standard residential investigation typically costs $1,500 to $4,000 depending on site complexity and the number of boreholes required.

AS 2870 (Residential slabs and footings) is the central Australian Standard governing residential foundation design and is the framework within which underpinning is typically designed. The site classification system under AS 2870 categorises soils as A (very stable), S (slightly reactive), M (moderately reactive), H1 (highly reactive level 1), H2 (highly reactive level 2), E (extremely reactive), or P (problem site requiring special engineering). Brisbane and South East Queensland soils are predominantly M and H1 class, with H2 sites in some specific areas and P classifications applying to fill, slip-prone, or other complex sites. The original residential footings were designed for the AS 2870 site classification known at construction; failure often results from the actual classification being more reactive than the original design assumed.

Engineering design for underpinning combines the geotechnical investigation findings with the structural assessment of the existing building to specify the underpinning methodology, the number and location of piers, the depth requirements for each pier, the load transfer detail at each pier head, the construction sequence to maintain building stability during the work, and any related rectification work required. Standard residential underpinning design typically costs $2,500 to $8,000 depending on complexity and any specific engineering analysis required. The engineer's design forms the basis for the council building approval submission and provides the construction reference for the underpinning contractor. Detailed Australian Standards including AS 2870 are published by Standards Australia and form the technical reference for the work.

The engineer also typically specifies any complementary rectification work that addresses the cause of the foundation movement rather than just the symptoms. Drainage rectification is the most common complementary work, with most residential foundation movement involving water management issues that need addressing alongside the structural underpinning. Detailed scope for drainage work sits on our drainage, French drain, and stormwater drainage plumbing guides. Tree management may also be specified where root activity is identified as contributing to the movement, with detailed scope on our stump grinding and removal guide. Combining the underpinning with the corrective drainage and tree work avoids future movement from the same causes and substantially improves the long-term value of the underpinning investment.

QBCC Licensing and Builder Selection

Underpinning work valued at $3,300 or more (effectively all underpinning work) requires the contractor to hold the appropriate QBCC licence under the Queensland Building and Construction Commission Act 1991. The relevant licence classes include Builder Open and Builder Low Rise (covering all building work including underpinning), specialist trade licences (concreting for the concrete work, bricklaying for any related masonry rectification), and various pile installation licences for pile-based methods. Specialist underpinning contractors typically operate under one of these licence categories appropriate to their primary methods. Property owners can verify any contractor'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 underpinning above the licensable threshold. Cover includes non-completion of work due to insolvency, death, or licence cancellation of the contractor, plus defective work cover for specified periods following completion. For underpinning, defective work cover applies for six years from completion for structural defects and twelve months for non-structural defects. The premium is paid by the contractor at contract signing. Property owners signing underpinning contracts should specifically confirm Home Warranty Scheme cover is included with the QBCC certificate number provided. Underpinning is among the most claim-prone categories of residential building work because the underlying causes can persist or recur, making the QBCC cover particularly valuable.

Contractor selection for underpinning warrants particular attention because the work is technically complex, depends heavily on engineering quality, and quality differences between contractors produce substantially different long-term outcomes. Specialist underpinning contractors with strong track records on similar foundation problems typically deliver better results than general builders adding underpinning to broader scopes. Reviewing recent completed underpinning projects from each shortlisted contractor, ideally including conversation with previous clients about both the work itself and the long-term performance, provides a meaningful basis for selection beyond pricing alone. Three to four written quotes from QBCC-licensed contractors who have all reviewed the engineer's design provides the cost benchmark.

Insurance and Underpinning

Home insurance coverage of underpinning costs depends substantially on the cause of the foundation movement and the specific terms of the policy. Sudden water damage events including burst plumbing, blocked stormwater causing localised saturation, or damage from neighbouring excavation work are commonly covered under home insurance policies as accidental damage events. Gradual reactive clay movement, long-term drainage issues, or movement from settlement of original construction is commonly excluded as either gradual deterioration or original construction defect. The boundary between covered and excluded causes can be unclear, with insurers and policyholders sometimes disputing the categorisation.

Insurance claim documentation typically requires an engineer's report identifying the cause of the movement, the building damage, and the proposed rectification work. Quality engineering reports for insurance purposes specifically address whether the cause matches a covered event and provide the technical evidence supporting the claim. Property owners with potential insurance claims should engage engineers experienced with insurance work who understand both the technical and the documentation requirements. Insurance assessors typically engage their own engineering review, with the policyholder's engineer's report providing the basis for negotiation rather than the final determination. The Insurance Council of Australia provides guidance on residential building insurance claim processes.

Where insurance covers the underpinning work, the insurer typically arranges contractors directly through their builder networks rather than reimbursing the homeowner for contractor costs. The work scope is determined by the engineer's report and the insurer's policy interpretation, with the homeowner's preferences for specific contractors or methods sometimes constrained by the insurer's arrangement. Where insurance does not cover the work, the homeowner pays directly and has full discretion over contractor selection and scope. Some homeowners find combinations of partial insurance coverage and self-funded scope work, with the insurance covering rectification of the building damage caused by movement and the homeowner funding the underpinning work that prevents future movement. Statutory consumer guarantees under the Australian Consumer Law administered by the Australian Competition and Consumer Commission apply regardless of insurance arrangements.

Reactive Clay and Foundation Movement in QLD

Reactive clay is the dominant residential soil type across most of South East Queensland and the central context for understanding foundation movement and underpinning need across the region. The clay's reactivity comes from the swelling and shrinking behaviour of clay minerals (particularly smectite) in response to moisture changes, with the soil expanding when wet and contracting when dry. The volume changes can be substantial, with M class soils typically moving 30 to 50 millimetres seasonally and H class soils 50 to 90 millimetres or more. Buildings designed and constructed correctly for the actual reactivity class accommodate this movement without distress. Buildings designed for less reactive conditions than they actually face commonly develop the cracking and distortion that prompts underpinning consideration.

Brisbane suburb soils vary substantially across the metropolitan area, with the dominant reactive clay punctuated by sandy soils, basalt-derived soils, and rock-bound soils in specific locations. Inner Brisbane suburbs commonly have established Brisbane Tuff (volcanic rock) at moderate depth providing stable bearing for deeper underpinning, with the surface soils being reactive alluvial clay above the rock. Outer suburbs across Logan, Ipswich, Moreton Bay, and Redland include various soil types with the central characteristic being substantial reactivity in the surface profile. The specific soil conditions on any property should be established through geotechnical investigation rather than assumed from the suburb context.

Tree-induced foundation movement is a substantial subset of reactive clay movement in Queensland. Established trees draw substantial moisture from soils within their root zone (typically extending out to one or two times the tree's height), and the moisture extraction produces clay shrinkage. Buildings within the tree's root zone may experience differential settlement on the tree side as the soil shrinks. Removal of established trees in this context can paradoxically produce a different problem; the soil that has been chronically dry under the tree may rebound (heave) as moisture returns over months or years, producing the reverse pattern of movement. Quality management of foundation movement in tree-affected zones requires consideration of both the current condition and the trajectory of soil moisture change over the years following any tree management.

Climate variability affecting rainfall patterns over multi-year periods produces foundation movement on reactive clay sites that runs in cycles rather than constant trends. Wet years produce soil expansion that can cause heave-type movement, while dry years produce contraction that can cause settlement. Buildings with marginal foundation design may show alternating directions of movement across decades, making underpinning design challenging because the engineer needs to anticipate both directions of future movement rather than just the current direction. Quality engineering accommodates this complexity by designing for both upward and downward soil movement potential rather than assuming the recent history will continue. Detailed soil reactivity classification under AS 2870 provides the framework for this analysis.

Underpinning Costs in Greater Brisbane and SE QLD

Greater Brisbane underpinning pricing varies modestly across the metropolitan area, with the main differentiators being access conditions and the specific reactive clay context. Inner Brisbane character home properties typically run at the upper end of standard ranges because of constrained access (narrow side passages limiting machine excavation, established gardens affecting work area, the substantial established homes themselves providing logistical challenges) and the tendency for reactive clay to produce more severe movement on these older homes. Middle ring suburbs offer easier access. Outer suburban areas across Logan, Ipswich, Moreton Bay, and Redland offer the most competitive pricing reflecting larger blocks, easier access, and the established local underpinning market.

The Gold Coast and Sunshine Coast follow similar pricing patterns to Brisbane, with the additional consideration that some coastal suburbs sit on different soil profiles (sandy soils, mixed alluvium, fill from previous development) producing different underpinning patterns than typical Brisbane reactive clay. Hinterland and acreage properties in both regions involve longer travel times for plant and engineers, with substantial underpinning projects typically running modestly higher than equivalent suburban work. Coordinating underpinning with related rectification work such as drainage rectification, painting, and any structural rebuilding work covered by bricklaying often produces better overall outcomes than treating each as separate engagements. Specialist carpentry input is commonly required for restoration of timber elements affected by foundation movement, and outdoor structures including pergolas may need realignment as part of the broader rectification.

Regional Queensland Underpinning Pricing

Toowoomba and the Darling Downs region offer underpinning pricing similar to Brisbane outer suburban rates, with the basalt-derived soils typical of much of the region producing different underpinning patterns than Brisbane reactive clay. Fill-induced settlement on properties built on filled creek lines or filled slopes is more common in the region than reactive clay movement. Bundaberg, Hervey Bay, and the Wide Bay region offer broadly similar pricing with stable contractor supply across most of the year. Tropical North Queensland underpinning in Cairns, Townsville, Mackay, and Rockhampton typically runs at modestly higher pricing reflecting longer travel times for specialist contractors and the smaller local market for the trade.

Mining-influenced regional centres including Mount Isa, Gladstone, Emerald, and the Bowen Basin towns produce underpinning market dynamics that fluctuate with broader mining activity. During strong mining cycles, contractor demand from industrial and infrastructure work draws specialist labour away from residential rectification, raising local rates and extending lead times. During softer cycles, residential capacity becomes available. Mining-related ground movement occasionally drives underpinning need in specific localities affected by historical mining subsidence, with these projects sometimes involving specialist engineering beyond standard residential scope. Remote rural areas of western Queensland, the Cape York peninsula, and the Gulf country involve substantial freight and travel implications, with underpinning typically running 30 to 50 percent above urban benchmarks reflecting the specialist nature of the trade and the limited local supplier base.

What to Look For in Underpinning Quotes

A detailed quote for underpinning work should set out the engineer's design reference (with the engineer's name and registration), the underpinning method, the number and depth of piers or zones, the construction sequence including any temporary support requirements during the work, the load transfer detail at each pier head, the related drainage or rectification work where included in scope, the council approval and inspection responsibility, the QBCC licence number of the contractor, the public liability insurance position, the QBCC Home Warranty Scheme premium, and the payment milestones tied to verifiable construction stages and engineer inspection points. Quotes vague on any of these elements should be revised before comparison.

Site visits are essential for accurate underpinning quoting because the work depends on conditions that cannot be assessed from photographs or descriptions. The actual access for excavation and pile equipment, the proximity to neighbouring structures and trees, the specific manifestation of the building distress that drives the work, the related drainage or surface conditions, and the practical constraints of working on the existing occupied building all need on-site assessment. Reputable underpinning contractors expect to spend 60 to 90 minutes on site for a substantial residential quote, take photographs and detailed measurements, and welcome the questions a property owner raises during the inspection. Quotes that arrive without a thorough site visit and review of the engineer's design should be treated cautiously.

Before signing any contract for underpinning work, 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, the contractor has reviewed and understands the engineer's design (with any proposed deviations specifically noted in writing), references from recent comparable completed projects are provided and ideally followed up with conversation about long-term performance, and the contract terms comply with the Domestic Building Contracts Act 2000. Tradies looking for work in this trade and adjacent specialties can find current opportunities through our builder jobs, concreter jobs, excavator and earthworks jobs, and bricklayer jobs pages, plus broader Queensland opportunities through the QLD tradie job leads board.

Compliance, Warranty, and Long-Term Value

Compliance documentation on underpinning work in Queensland produces the trail that protects the property owner through subsequent ownership and any future insurance or warranty claim. The contract documentation, the QBCC Home Warranty Scheme certificate, the geotechnical investigation report, the engineer's design and certification, the council building approval, the Form 16 inspection records during construction, the engineer's witness inspection at key construction stages, 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 underpinning combines the QBCC Home Warranty Scheme cover (six years for structural defects, twelve months for non-structural defects), the contractor's own workmanship warranty (typically two to seven years on items not covered by the QBCC scheme), the engineer's professional indemnity insurance covering design errors, and the statutory consumer guarantees under the Australian Consumer Law. Property owners should retain all warranty documentation and engage the relevant warranty provider promptly if any subsequent movement or defect emerges. Documented written notification rather than verbal complaints provides the basis for any subsequent dispute resolution. Photographs of pre-work conditions and progress documentation through the build provide useful supporting evidence for any future warranty claim or insurance matter, and quality contractors typically maintain this documentation as standard project practice.

Preventing Future Movement

Long-term value on underpinning investment depends substantially on addressing the cause of the original foundation movement rather than just the structural symptoms. Drainage management is the single most important preventive measure on most reactive clay sites, with proper stormwater management, surface grading, and any required subsoil drainage substantially reducing the moisture variation that drives clay reactivity. Tree management within the building's foundation zone reduces moisture extraction by established trees, though tree management itself requires careful consideration of soil rebound effects following removal. Plumbing inspection and repair of any leaking water or drainage services prevents the localised saturation that can cause sudden settlement events. Quality preventive maintenance extends the useful life of completed underpinning indefinitely and avoids the need for repeat work as new movement zones develop. Three formal written quotes from QBCC-licensed underpinning contractors who have all reviewed the engineer's design provides the basis for selecting the operator whose approach and pricing best suits the project. Post your underpinning job on The Quote Yard to connect with QBCC-licensed Queensland underpinning specialists who provide assessed quotes for your specific project.