Commercial Kitchen Exhaust Cleaning Costs WA 2026 - Get Free Quotes

What Commercial Kitchen Exhaust Cleaning Covers

Commercial kitchen exhaust cleaning covers the entire path that cooking vapour takes from the appliance to the outside air. That path starts at the canopy hood above the cooking line, passes through the grease filters, into the plenum chamber behind them, along the ductwork through the building, and out through a roof mounted or wall mounted exhaust fan. Grease condenses at every point along that route. A clean that addresses only the visible stainless steel and the filters has cleaned perhaps a fifth of the system.

The filters are the part most kitchens handle themselves, and they are the easiest part to do badly. Baffle filters need to be removed, degreased and refitted the correct way around, and a filter that has been put back inverted does not drain properly. Mesh filters, which are still found in older installations, clog faster and are considerably harder to clean thoroughly. Filters are the first line of defence for everything downstream. A kitchen that maintains them well genuinely slows how quickly the rest of the system loads up, which shows in the deposit readings at the next service. It is the one part of the system a kitchen controls day to day.

Behind the filters sits the plenum, which is the chamber the extracted air passes through before it enters the duct. It is the single most consistently neglected part of a commercial kitchen exhaust system, because it is out of sight and requires the filters to be removed to reach. Grease accumulates there heavily. Any contractor whose scope does not explicitly include the plenum is quoting a partial clean, and the difference between a quote that includes it and one that does not is a common reason two prices look so different.

Ductwork is where the real fire risk concentrates and where the cost of a thorough clean sits. Horizontal runs collect pooled grease at low points, vertical risers carry it as a film on all four internal surfaces, and bends accumulate more heavily than straight sections. Cleaning duct properly means physical access at intervals along its length, scraping and degreasing back toward bare metal, and then verifying the result. This is the part of the job that separates a genuine exhaust hygiene contractor from a general commercial cleaning business with a pressure washer. The equipment and the training are different, and so is the reporting.

The exhaust fan at the end of the system is a mechanical asset as well as a grease trap. Impellers accumulate deposit unevenly, which puts them out of balance and shortens bearing life. A fan that is cleaned and serviced regularly moves the air volume it was designed to move, and our exhaust fan installation page covers replacement where servicing is no longer economical, and a kitchen with an underperforming fan becomes hot, smoky and unpleasant to work in long before anyone identifies the cause. Our commercial air conditioning guide covers the make up air side of the same equation.

Fire Risk and Why This Is a Compliance Item

Kitchen exhaust systems are one of the most common origins of serious commercial building fires in Australia. The mechanism is straightforward. Grease deposit inside the duct is combustible, an ignition source sits directly beneath it in the form of open flame cooking, and the duct itself provides a ready made path for fire to travel through the building's structure into ceiling spaces and roof voids. A fire that starts in a canopy and enters the duct is no longer a kitchen fire. It becomes a building fire with a head start.

Deposit thickness is the measure that matters. Industry practice across Australia treats accumulation approaching two hundred microns as the point at which cleaning is due, and heavier accumulation as an active hazard. That measurement is taken at multiple points through the system rather than at the easiest access point, because deposit is never uniform. A report that quotes a single figure for an entire system has not really measured it, and thickness readings taken only at the canopy tell you very little about the state of the riser.

Insurance is where the consequences usually land first. Most commercial property and business interruption policies covering food premises now include conditions about kitchen exhaust hygiene, and after a fire the insurer will ask for the cleaning history. A venue that cannot produce dated reports showing regular cleaning to a recognised interval is in a poor position, regardless of whether the exhaust system actually started the fire. This is the practical reason the documentation matters as much as the cleaning itself. One without the other leaves the venue exposed.

The other exposure is the business interruption rather than the building damage. A kitchen fire closes the venue, and in a leased tenancy it can trigger obligations to the landlord and to neighbouring tenants whose premises were affected. Small hospitality businesses very rarely survive an extended forced closure. Set against that, a quarterly cleaning agreement is one of the cheapest risk controls available to a food business.

Fire suppression systems are a related but separate obligation. Wet chemical suppression over the cooking line is standard in commercial kitchens, and those systems require servicing at defined intervals under AS 1851. Ansul and Amerex are the systems most commonly encountered in Australian kitchens. The suppression system and the exhaust cleaning are usually performed by different contractors, and coordinating them into the same shutdown is both cheaper and more sensible than arranging two separate closures. Our commercial fire compliance guide covers the servicing regime in detail. Aligning the two visits also means the kitchen only closes once.

Australian Standards and WA Food Regulation

AS 1851 is the routine service standard for fire protection systems and equipment, and it is the document that establishes kitchen exhaust hygiene as a maintenance obligation rather than a housekeeping preference. It sets out inspection and cleaning requirements including deposit thickness assessment. AS 1668.1 covers the use of ventilation and air conditioning in buildings for fire and smoke control, and it is the standard that governs how kitchen exhaust ductwork must be constructed, routed and provided with access for cleaning. Copies are available through Standards Australia.

AS 1668.2 addresses mechanical ventilation for occupant comfort and contaminant control, and AS 4674 covers the design, construction and fitout of food premises. Together those documents set the expectation that a commercial kitchen has adequate extraction, adequate make up air, and surfaces that can actually be cleaned. Where a fitout has been designed without reference to them, the resulting kitchen is frequently impossible to clean properly no matter which contractor is engaged. Our retail shopfitting guide covers the fitout side of food premises work. Getting ventilation right at that stage is far cheaper than retrofitting it.

In Western Australia the food safety layer sits under the Food Act 2008, administered by local governments through their environmental health officers. Food premises are registered with the local government and inspected on a risk basis, and the Food Standards Code applies through that Act. Standard 3.2.2 covers food safety practices and general requirements, and Standard 3.2.3 covers food premises and equipment. An environmental health officer inspecting a kitchen will look at the canopy and filters, because a grease laden canopy above a cooking line is both a fire risk and a contamination risk.

Standard 3.2.3 also matters at the fitout stage rather than only in operation. Local governments in WA generally require food premises plans to be assessed before construction, and that assessment covers ventilation and the ability to clean the installation. A venue that submits plans late, or that varies the layout after approval without telling anyone, can find itself unable to open on schedule. Health information for WA is published through the WA Department of Health, and the registration process runs through the local government.

Work health and safety obligations under the Work Health and Safety Act 2020 apply to the cleaning work itself. Roof access to exhaust fans is work at height, ductwork can present confined space risk depending on its dimensions and configuration, and the chemicals used for degreasing are caustic. A contractor who arrives to clean a roof fan on a two storey building without any fall protection plan is creating a risk for both parties, because the duty extends to the person who controls the workplace. Current guidance is published by WorkSafe WA.

How Often Cleaning Is Actually Needed

Cooking method drives frequency far more than kitchen size does, and this is the most common misunderstanding in the trade. Deep frying and char grilling produce the heaviest grease loading by a wide margin. Wok cooking is similarly heavy because of the volume of oil vapour and the intensity of the heat. Baking, boiling and steaming produce comparatively little grease. A small burger shop running two fryers and a char grill will load its duct faster than a much larger kitchen doing predominantly oven work.

Trading hours multiply whatever the cooking method produces. A venue serving lunch five days a week and one serving three meals a day seven days a week have very different accumulation rates even with identical equipment. Twenty four hour operations, which include some hospital, mine site and hotel kitchens, accumulate continuously. When a contractor asks about trading hours and menu before quoting a frequency, they are doing the assessment properly rather than padding the scope.

As a working guide, heavy use kitchens with frying and grilling typically need quarterly cleaning, moderate use kitchens every six months, and light use kitchens such as those in offices, schools or venues doing predominantly reheating annually. These are starting points rather than rules. The reliable approach is to clean, measure the deposit at the next inspection, and adjust the interval based on what the system actually shows. A contractor who sets an interval and then never revisits it is not managing the risk. They are running a subscription.

Seasonal variation catches some venues out. A restaurant in a tourist area, a club that runs functions through summer, or a school canteen that shuts for a term all have uneven loading through the year. Setting a fixed calendar interval against uneven use means either cleaning when it is not needed or leaving it too long. Aligning the schedule with the trading pattern rather than the calendar is straightforward once someone thinks about it.

Filters sit on a completely different cycle to the rest of the system. They need attention weekly or fortnightly in a busy kitchen, and most venues handle that in house. The important point is that good filter maintenance genuinely slows the loading of everything downstream, which can extend the interval between full system cleans. It is one of the few maintenance tasks where in house effort has a direct and measurable effect on an external contractor's cost.

What a Proper Clean Includes

A complete exhaust clean works through the system in sequence rather than treating it as one job. Filters are removed and cleaned or exchanged. The canopy interior, including the grease gutters and drain points, is degreased. The plenum behind the filters is opened and cleaned. Ductwork is accessed at intervals along its length and cleaned toward bare metal. The exhaust fan is cleaned, and the discharge area around it is addressed. Anything less than that sequence leaves grease somewhere in the system.

Chemical selection and application matter more than the pressure of the water. Caustic degreasers dissolve the deposit so it can be removed, and they need contact time to work. Rushing that step means scrubbing rather than dissolving, and scrubbing does not reach far into a duct. The chemicals are also hazardous to skin and eyes and can damage some finishes, so protection of the surrounding kitchen surfaces and equipment is part of a properly conducted job.

Containment separates a professional job from a mess. Cooking equipment, benches and floors need protection before any chemical goes on, and the run off has to be captured rather than allowed to find its way across the kitchen. A crew that arrives with plastic sheeting, absorbent matting and a plan for the waste water is doing the job properly. A crew that starts spraying without covering anything will leave the kitchen needing a second clean before it can be used. That second clean is rarely included in the price. Ask what protection is allowed for before the crew arrives.

Verification is what turns cleaning into a compliance activity. Deposit thickness should be measured before and after at multiple points, and photographs taken at the same points each visit build a record that shows the system's condition over time. Access panel locations should be noted so the next contractor is not searching for them. Where an area could not be reached, that should be stated in the report rather than quietly omitted, because an unreachable section of duct is a finding that the building owner needs to act on.

Timing is almost always after hours. Cleaning cannot happen while food is being prepared, and the chemicals used are not compatible with an operating kitchen. Most commercial cleans run overnight or on a closure day, and the labour is priced accordingly. A quote that looks unusually cheap is worth checking against the proposed working hours, because a price based on daytime access to a kitchen that trades all day is not a price that can actually be delivered.

A kitchen clean is not the same job as an exhaust clean, and the two get confused. General kitchen deep cleaning covers floors, walls, equipment and the visible surfaces of the canopy. Exhaust hygiene covers the interior of the extraction system. Some contractors offer both, which is convenient, but they should be scoped and priced as separate items. Our commercial cleaning page covers the general kitchen and premises side of the work.

Canopy Types, Filters and Odour Control

Canopy design has a direct effect on how much grease reaches the ductwork and how easily the system can be maintained. A well designed canopy captures the rising plume completely, which means adequate overhang beyond the cooking surface and sufficient capture velocity. Undersized canopies let vapour escape into the kitchen, which is why some kitchens are permanently greasy on surfaces well away from the cooking line. Retrofitting a larger canopy is disruptive, so this is a decision best made at fitout rather than corrected later.

Baffle filters are the standard in Australian commercial kitchens and they work by forcing the airstream through a series of sharp changes in direction. Grease droplets cannot follow the turns, so they impact on the baffle surface and drain down into the gutter. They are effective, robust and straightforward to clean. Mesh filters, still found in older installations, capture by trapping rather than impaction, and they clog quickly and are far harder to clean thoroughly. Replacing mesh with baffle filters is an inexpensive upgrade with an immediate benefit downstream.

Filters must be correctly sized and correctly oriented to work, and both are commonly wrong in practice. A gap where a filter should sit lets unfiltered air straight into the plenum, and a filter fitted upside down cannot drain, so the collected grease sits in the airstream and is re-entrained. Missing filters are usually the result of one being taken away for cleaning and never returned. A quick visual check of the filter bank is something kitchen staff can do daily and it catches most of these problems.

Some kitchens run additional treatment beyond filters. Ultraviolet systems installed in the canopy break down grease vapour before it enters the duct, which reduces duct loading substantially where they are maintained properly. Electrostatic precipitators charge grease particles and collect them on plates. Both reduce how quickly ductwork loads up, and both introduce their own maintenance obligation, because a UV lamp past its service life or a fouled precipitator cell does nothing while still appearing to be installed. Neither removes the need for duct cleaning entirely.

Water wash canopies use a built in spray system to wash the plenum and filters on a cycle, usually overnight. They reduce manual cleaning in the canopy itself and are common in high volume kitchens. They do not clean the ductwork beyond the plenum, so the duct and fan still require scheduled attention, and the wash system itself needs servicing including the detergent dosing and the drainage. A venue with a water wash canopy that believes it has no further obligation has misunderstood what the system does.

Odour control is a separate requirement that arises where discharge is close to neighbours, which describes most inner suburban Perth venues and every mixed use building. Carbon filtration, ozone injection and UV treatment are the common approaches, and each carries a consumable or maintenance cost that should be understood before installation. Local governments can impose conditions relating to odour, and a venue that receives complaints will generally be asked to demonstrate that its system is being maintained. Odour equipment left unserviced stops working long before anyone notices. The complaints usually arrive first, and by then the local government is generally involved.

Access Panels, Ductwork and Design Problems

AS 1668.1 requires kitchen exhaust ductwork to be provided with access for cleaning, and the practical form that takes is hinged or removable access panels at intervals along the duct and at every change of direction. Systems built to the standard can be cleaned. Systems built without adequate access cannot, no matter which contractor is engaged, and the honest answer from a good contractor is that sections of the duct are unreachable. That answer is uncomfortable but it is far better than a report implying the whole system was cleaned.

Retrofitting access panels is the fix, and it is straightforward work. Panels are cut into the duct at the required intervals, framed and fitted with a gasketed cover that maintains the integrity of the duct. The cost sits between one hundred and eighty and four hundred and fifty dollars per panel depending on location and access. On a system that has never been properly cleanable, that one off spend usually pays for itself within a few cleaning cycles because the contractor stops charging for the difficulty of working around the problem.

Duct routing creates its own problems in older Perth buildings, particularly where a food tenancy has been fitted into premises never designed for one. Long horizontal runs with minimal fall allow grease to pool. Ducts routed through ceiling spaces above other tenancies create both a fire path and an access problem. Flexible ducting, which occasionally appears in kitchen exhaust installations, is not appropriate for grease laden air and cannot be cleaned properly. Any of these is a finding worth raising with the building owner rather than working around indefinitely.

Make up air is the other half of the ventilation equation and it is regularly overlooked. An exhaust system removes a large volume of air from the kitchen, and that air has to be replaced from somewhere. Where no make up air is provided, the kitchen goes into negative pressure, doors become hard to open, the exhaust fan cannot achieve its design flow, and cooking smells migrate into the dining room. Adding make up air is a mechanical services job rather than a cleaning one, but the exhaust contractor is frequently the first to identify it.

Fire dampers appear in ductwork where it passes through fire rated construction, and they have their own inspection and testing obligations under AS 1851. They are not part of a cleaning scope, but a cleaning contractor working inside the duct is well placed to notice one that is obstructed by grease or has been painted or wired open. That observation belongs in the report. Our commercial fire compliance page covers damper testing and the broader passive fire protection regime. A damper wired open defeats the compartmentation the building relies on.

Roof Fans, Discharge and Environmental Obligations

The exhaust fan is usually roof mounted, and reaching it safely is a substantial part of the job on any building above single storey. Roof anchor points, harnesses, static lines or a scissor lift may all be required depending on the roof and the pitch. Buildings with compliant roof access systems get cleaned more cheaply and more often than those without, because the contractor is not pricing in the cost of establishing safe access every visit. Installing a permanent anchor system is a capital cost that reduces every future service.

Grease discharge around the fan is a recurring problem that building owners frequently do not know about until it becomes visible. Where a fan is not fitted with an effective grease containment system, extracted grease settles on the roof around the discharge point. It stains the roof sheeting, degrades some coatings, and creates a slip hazard for anyone working up there, and removing it is specialist pressure cleaning rather than a hose down. It also washes into the gutters when it rains. From there it enters the stormwater system, which in Perth usually means a soakwell rather than a piped network.

That stormwater path matters more in Perth than in many other Australian cities. Across most of the Swan Coastal Plain, roof water goes to soakwells rather than to a piped drainage network, which means it enters shallow groundwater relatively directly. Grease and the caustic chemicals used to remove it are both contaminants. A cleaning contractor who rinses a roof fan and lets the run off go straight down the downpipe has created an environmental problem, and the obligation sits with the occupier as much as with the contractor.

Wash water from the kitchen side of the job has a parallel obligation. Grease laden waste water should go to a grease arrestor rather than directly to sewer, and trade waste consent from the water service provider governs what may be discharged. Water Corporation covers most of the state, while Aqwest in Bunbury and Busselton Water operate their own licensed schemes with their own requirements. Our commercial plumbing maintenance guide covers grease arrestors and trade waste in more detail. Consent conditions differ between providers, so check which one applies to your address. Getting that wrong is a compliance problem rather than a plumbing one.

Fan servicing is worth bundling with cleaning because the technician is already up there. Bearings, belts, mountings and the electrical connection all deteriorate in a hot greasy environment, and a fan that seizes takes the kitchen out of service immediately. Checking and adjusting belt tension, greasing bearings and confirming the isolator works are quick tasks during a scheduled visit and expensive ones as an emergency callout. Any electrical work on the fan itself requires a licensed electrical contractor, which our commercial electrician page covers.

Reporting, Certification and Insurance

The report is the product as much as the clean is. A useful exhaust hygiene report records the date, the areas cleaned, deposit thickness readings before and after at identified locations, photographs at consistent points, the condition of access panels and the fan, any areas that could not be reached, and the recommended date for the next service. That document is what an environmental health officer, an insurer or a prospective purchaser will ask to see. A one line invoice saying the canopy was cleaned is not evidence of anything. Ask what the report will contain before engaging anyone.

Photographic records build value over time in a way that single reports do not. Images taken at the same locations each visit show whether the system is loading faster or slower than expected, which lets the cleaning interval be adjusted on evidence rather than on guesswork. They also protect the venue, because a photograph of clean bare metal duct is difficult to argue with after an incident. Ask whether photographs are included and whether they are location tagged rather than a generic handful.

Insurers have become considerably more specific about this in recent years. Policies covering food premises commonly require exhaust cleaning at stated intervals by a competent contractor, with records retained. The requirement varies between insurers, so the sensible step is to read the policy schedule and set the cleaning interval to satisfy it rather than assuming a general standard applies. Where the policy specifies an interval shorter than the contractor has recommended, the policy wins. It is worth reading the schedule rather than assuming.

Keeping the records in one place is a small discipline that repays itself. Exhaust cleaning reports belong in the same file as fire suppression service records, fire equipment servicing, and the food business registration and inspection reports. When an incident occurs or a lease is being assigned, having that file complete turns a stressful search into a straightforward handover, and a building inspection at that point becomes considerably simpler. Records belong to the business rather than to whichever contractor produced them, and they should transfer if the contractor changes.

Landlord and tenant responsibility for exhaust cleaning is worth settling in writing early. In most commercial leases the tenant operating the food business carries the obligation, but the exhaust system frequently passes through and discharges from parts of the building the landlord controls. Where the duct is in a common riser or the fan is on a shared roof, access arrangements and repair responsibility need to be clear. Disputes about this surface at the worst possible time. That is usually after a fire or during a lease assignment, when neither party has room to negotiate.

Mixed Use Buildings and Shared Systems

Mixed use developments across Perth increasingly place food tenancies at ground level with residential apartments above, and that arrangement makes kitchen exhaust a whole of building issue rather than a tenancy one. The duct from a ground floor restaurant typically rises through a shared riser to discharge at roof level, passing through or adjacent to residential floors on the way. A fire in that duct is a fire in the residential building. The stakes are considerably higher than in a standalone commercial premises.

Responsibility in a strata scheme depends on whether the affected element is lot property or common property under the Strata Titles Act 1985. The canopy and the duct within the tenancy are generally the lot owner's or occupier's responsibility. The riser and the roof fan are frequently common property, which puts them under the strata company. Establishing the boundary from the registered plan before an issue arises avoids the situation where a cleaning contractor cannot proceed because nobody will authorise access to half the system.

Odour is the complaint that generates the most correspondence in mixed use buildings. Residents above a food tenancy notice cooking smells, and the cause is usually either a discharge point too close to windows and balconies, an under performing fan, or a system that has not been cleaned. Cleaning frequently improves the situation because a heavily loaded system moves less air and holds odour. Where the discharge location is the underlying problem, that is a design issue requiring a mechanical services solution rather than a cleaning one.

Access coordination is the practical difficulty in these buildings. Reaching a roof fan may require passage through residential common areas, a lift booking, and notice to residents. Building managers commonly restrict working hours and may require after-hours access to be arranged through the building security system, which pushes the job into a narrow overnight window. None of this is unreasonable but all of it costs time, and a contractor who has not been told about it will either not turn up prepared or will vary the price. Our strata and body corporate plumbing page covers the same access and approval dynamic. Telling the contractor about those restrictions before they quote avoids a revised price later.

Where a new food tenancy is being fitted into a mixed use building, the exhaust design should be resolved before the lease is signed rather than after. Retrofitting a compliant duct route and discharge point into an existing building is expensive and occasionally impossible, and discovering that after committing to a lease is a serious problem for a new business. Our office fitout and retail shopfitting guides cover the approvals sequence for commercial fitouts in WA. Both put the mechanical services decisions well before the lease signature.

Regional and Remote WA

Kitchen exhaust cleaning in regional Western Australia costs more for structural reasons rather than opportunistic ones. The specialist contractor base outside Perth is thin, and many regional venues are serviced by contractors travelling from the metropolitan area. Travel time, vehicle costs and accommodation are real expenses that appear in the price. A quote for a Kalgoorlie or Karratha venue priced at Perth rates has either not understood the logistics or is planning to revise the number later.

Batching is the most effective control available to regional operators. Where several venues in a town coordinate their cleaning into the same week, the mobilisation cost is shared rather than repeated. Hospitality groups with multiple regional sites do this routinely, and independent operators can achieve the same result informally by talking to other venues nearby. It is one of the few situations where competitors have a shared interest in coordinating. Most are happy to once it is raised.

Mine site and camp kitchens are a substantial part of the WA market and they operate differently to commercial hospitality. Volumes are high, service is continuous, and the kitchens are frequently in modular or transportable buildings with compact duct runs and roof mounted fans in exposed locations. Site access requirements add real overhead, including inductions, permit systems and competency verification before any work starts. Contractors experienced in that environment price the overhead because it exists rather than because they can.

Remote sites also concentrate the consequences of failure. A fire in a camp kitchen serving several hundred workers is not simply a property loss, because there is no alternative catering nearby and no fire brigade minutes away. That reality is why resource sector clients generally maintain shorter cleaning intervals and better documentation than the average metropolitan venue. It is a reasonable model for any operator whose business stops entirely if the kitchen stops. Very few hospitality businesses can absorb an extended closure.

Coastal regional venues from Geraldton through Broome face an additional maintenance issue with the fan rather than the duct. Salt laden air corrodes fan housings, fixings and electrical enclosures, and a fan that is already coated in grease holds the salt against the metal. Specifying appropriate materials at replacement and washing down the fan during service both extend its life considerably. Businesses working through their broader regulatory obligations can start at ABLIS.

What to Look Out For and Getting Useful Quotes

The most useful information a venue can provide is the cooking equipment list, the trading hours and the duct layout. Cooking method determines loading, trading hours determine when work can happen, and the duct run determines how much of the job is accessible. A photograph of the canopy and the roof fan is worth more than a paragraph of description. Providing that upfront produces comparable quotes. Withholding it produces three prices for three different assumptions, which is not a comparison at all.

Ask specifically what the scope covers and be alert to what is missing. Filters, canopy interior, plenum, ductwork, fan and discharge area are separable items, and a quote that lists only the canopy is a partial clean at a partial price. The plenum and the duct are the two most commonly excluded elements, and they are the two that matter most for fire risk. Where a contractor has excluded something, ask what it would cost to include rather than assuming it was an oversight.

Site visits before quoting are the norm for anything beyond a small cafe. Access to the roof, the state of the existing access panels, the duct route and the working hours available all affect price materially, and none of them can be assessed reliably over the phone. A contractor willing to quote a large kitchen sight unseen is pricing assumptions, and the variations tend to arrive once the work has started and the kitchen is out of service. The other trades a commercial kitchen relies on are listed on our WA services hub. Several of them touch a commercial kitchen at some point, and coordinating them saves closures.

Warning signs are fairly consistent. A quote with no mention of deposit thickness measurement or reporting suggests the compliance side is not being taken seriously. Reluctance to specify which sections of duct will be accessed is another. Unusually low pricing on a large kitchen frequently means daytime work that cannot actually be delivered, or a canopy only scope described as a system clean. A contractor who cannot say which standard they work to is not the contractor for a fire safety obligation.

Check the insurance rather than assuming it is in place. Public liability cover is standard and the certificate should be current, and where the contractor employs staff, workers compensation should be confirmed separately. This work involves caustic chemicals, roof access and occasionally confined spaces, so the injury exposure is real and an uninsured incident on your premises becomes your problem. Ask also whether the crew attending holds relevant height safety training, because that is the control that matters most on a roof mounted fan.

Programmed agreements generally beat reactive booking on both price and compliance. A quarterly or six monthly agreement locks in a rate, ensures the record stays continuous, and means somebody other than the venue owner is tracking when the next service is due. Confirm what the agreement includes, whether filter exchange is covered, and what the arrangement is if the interval needs to change. Guidance on how the consumer guarantees apply is available from Consumer Protection WA and the ACCC.