WA · Pilbara & Kimberley
Home builders in Onslow
A builder’s licence is permission to trade. It is not a solvency test. 2,361 construction companies entered external administration last financial year, more than any other industry in the country — and no regulator checks whether the one quoting your Onslow job can still pay its framer on Friday. We run the Four-Point Builder Check™: licence with Building and Energy WA, insurance sighted, still trading, and genuinely working in Onslow. Then one name and the reasoning behind it — or a straight no.
- Costs you nothing, ever
- No obligation to use them
- Details never sold
Why this is harder than it looks in Onslow
- Onslow is not a generic block
Mapped here: 2 residential zones, 3 overlay families, 4 heritage records, bushfire-prone land. A builder who prices the house and discovers the site is a builder whose quote moves — and the variations land on you, not on them. The ones who work Onslow regularly already know which of these reach which streets.
- A current licence tells you nothing about solvency
Every one of the companies behind that figure held a valid licence the day before it failed. The certificate on the wall says they are permitted to build. It does not say they can pay their framer on Friday.
What building in Onslow actually involves
Three special control areas over one small town
Onslow carries three mapped special control areas under the Ashburton Local Planning Scheme No. 7, and they are unusually varied for a townsite of 189.13 km²:
Onslow coastal hazard area. Coastal processes — erosion and inundation — drive setbacks and can decide whether a site is developable at all.
Onslow airport height restrictions area. This limits building height by reference to aircraft approach surfaces rather than to streetscape, which is a control most homeowners never meet. It can bind a two-storey house or a tall roof form where the ordinary scheme height would not.
Waste water treatment plant odour buffer. A buffer of this kind constrains sensitive land uses near the plant, and a dwelling is a sensitive use.
Each sits over the zone and adds its own requirements, and each is an address question rather than a town-wide one. Establish which reach your lot with Shire of Ashburton before a design is drawn — it is entirely possible for a block to sit inside more than one.
An R-code range, and a townsite being expanded
Residential land maps R12.5 to R30, including a split R12.5/30 code. A split code means the density depends on conditions set in the scheme — typically servicing or a structure plan — rather than being fixed, so it is worth confirming which limb applies to your parcel.
The Onslow Townsite Expansion Structure Plan is endorsed here. Where a structure plan covers land, it sets density, lot layout and staging, and it takes precedence over assumptions drawn from the zone alone.
Four heritage places, eight on the survey
Four places sit on statutory heritage instruments and eight on the local heritage survey. That is a light footprint against Roebourne's ten statutory listings, and most parcels will be clear — but the check on inHerit costs a few minutes and the survey is where an older Onslow building is most likely to appear.
Cyclone, and the things we cannot source
Onslow is on the north-west coast, where the cyclone wind region is the design basis for structure, tie-downs, roof fixings and glazing. Confirm the region for the site with the council and your engineer; it is not an optional specification.
Bushfire-prone land is mapped here. Slope and acid sulfate we cannot answer — Western Australia publishes neither as a statewide layer we read — so ask the Shire with the coastal hazard question.
What you are dealing with in Onslow
Six things a builder prices differently. This is the suburb-level picture — which of them reaches your block is an address check.
- Bushfire Mapped BAL assessment; glazing, decking and screening spec.
- Flood Not mapped Sets a minimum floor level. Flood report first.
- Heritage 4 records Impact statement; limits demolition, form and materials.
- Slope Not checked No Western Australian scheme maps landslip as a special control area, and there is no statewide layer
- Soil Not checked DWER publishes acid sulfate risk as regional map sheets, not one statewide layer we can read a blank from
- Density controls 2 zones · R12.5–R30 What may be built, and how much. Set parcel by parcel.
What is mapped in Onslow
Read from Landgate SLIP, not a summary of it.
- Council
- Shire of Ashburton
- Planning scheme
- Ashburton Local Planning Scheme No. 7
- Overlays mapped here
- Onslow airport height restrictions area - special control area · Onslow coastal hazard area - special control area · Waste water treatment plant odour buffer special control area
- Residential zones mapped
- Residential
Urban development - Bushfire-prone land
- Mapped in this suburb
- Heritage places mapped
- 4
- Urban growth area
- Yes
- R-Code density
- R12.5 to R30
Planning data from Landgate SLIP (CC BY 4.0), read 2026-09-19. Suburb-level, not a report on your block — check your address on the WA planning scheme maps.
Residential density codes mapped here
The mechanism
The Four-Point Builder Check™
Every one of them is something you could do yourself. What we sell is that it has been done, dated and published — and repeated on a schedule, because a check that happened once is worth nothing.
- 01 · Licence
Looked up on Building and Energy WA's own public register — number, class and status, with the date we looked recorded.
- 02 · Insurance
Public liability plus whatever warranty or indemnity cover WA requires. Sighted by us, not self-declared on a form.
- 03 · Still trading
Solvency re-checked on a schedule. A licence stays current right up until the day a company fails.
- 04 · Works in Onslow
Confirmed with the builder against the suburbs they genuinely service — not a radius drawn on a map.
How this works
- 01Tell us about the build
Six questions, about three minutes.
- 02We match it against Onslow
Against the 2 residential zones mapped here, 3 overlay families, bushfire-prone land, growth-area status — and against which builders hold the right licence class for it, have done it before, and actually work under Shire of Ashburton.
- 03One recommendation, with the reasoning
Not six quotes to sift. We negotiate on your behalf; you deal with the builder directly. Builders pay us, only once you sign.
What you get, and what it costs you
- One builder, not a list
We read your brief against what is actually mapped in Onslow — 2 residential zones, 3 overlay families, 4 heritage records — and against which builders hold the right licence class, have built under these constraints before, and genuinely work under Shire of Ashburton. You get one name and the reasoning in writing.
- Or a straight no
The same business day you get one of two things: our recommendation, with the reasons — or a plain email saying we have not got a builder in Onslow we would put our name to yet, and what we are doing about it. No drip campaign, no being passed around.
- It costs you nothing, ever
The builder pays us, and only if you sign with them. You are never charged, and you are never under any obligation to use the builder we name. How the fee works.
We are not a builder, we do not manage your build, and we do not hold your money.
Fair questions before you send anything
- You have no builders listed in Onslow yet. What use is that?
A fair question, and the honest answer is that a list is not what we do. We do not publish a builder until the licence is checked, the insurance is sighted and we have confirmed they are still trading — so an empty list here means we have not finished that work in Onslow, not that we cannot help. Send the brief and we go and find one for your block. If we cannot, you get told that, the same day, rather than being added to a mailing list.
- Why not just get three quotes myself?
You can, and for a simple job you probably should. The difficulty on a block in Onslow is that quotes are only comparable when they assume the same things — and with 2 residential zones mapped here, two builders can price the same house against different assumptions about the site and both be quoting honestly. Sorting that out is the part we do.
Builders serving Onslow
Questions about building in Onslow
What are the special control areas in Onslow?
Three: a coastal hazard area, an airport height restrictions area, and a waste water treatment plant odour buffer. Each sits over the zone and adds its own requirements, each is an address question, and a block can sit inside more than one.
Can the airport limit my house height?
It can. An airport height restrictions area limits building height by reference to aircraft approach surfaces rather than to streetscape, so it can bind a two-storey house or a tall roof form where the ordinary scheme height would not. Check whether it reaches your lot with the Shire of Ashburton.
What does a split R12.5/30 code mean?
That the density depends on conditions set in the scheme — typically servicing or an endorsed structure plan — rather than being fixed. Confirm which limb applies to your parcel before assuming a yield.
Is there a structure plan over Onslow?
The Onslow Townsite Expansion Structure Plan is endorsed. Where a structure plan covers land it sets density, lot layout and staging, and it takes precedence over assumptions drawn from the zone alone.
How much heritage is mapped?
Four places on statutory heritage instruments and eight on the local heritage survey — a light footprint. Most parcels will be clear, but check the address on inHerit, because the survey is where an older Onslow building is most likely to appear.
Does cyclone region affect the design?
Yes, fundamentally. On the north-west coast the cyclone wind region is the design basis for structure, tie-downs, roof fixings and glazing rather than an upgrade to it. Confirm the region for the site with the Shire and your engineer.
What to ask a builder about a block in Onslow
Each one is here because of something mapped in Onslow. Take them to whoever quotes.
- 01
Which of the 2 residential zones mapped in Onslow covers this address, and what does that one permit that the others do not?
- 02
What bushfire attack level have you built to in Onslow before, and what did it change in the glazing, decking and screening?
- 03
Have you had an application through Shire of Ashburton where a heritage control applied, and how long did the assessment take?
- 04
What R-code is this block, and what does it set for minimum and average site area per dwelling?
Local landmarks in Onslow
- Thalanyji Oval
- Thevenard Island Nature Reserve
- Onslow Hospital
- Onslow Primary School
Named plans that apply in Onslow
Structure plans covering land here, as the authority names them. Which one governs your lot decides its density, layout and staging — check the address before you assume the zone alone sets the rules.
- Onslow Townsite Expansion Structure Plan
Endorsed by the Western Australian Planning Commission. The plan that covers your lot sets its density, lot layout and staging.
Source: catalogue.data.wa.gov.au/dataset/local-planning-scheme-zones-and-reserves-dop-025, read 2026-09-19.
No catch
What you are agreeing to
- Nothing. There is no contract with us, no account to create, no card, and nothing to cancel.
- No obligation to use whoever we recommend. Take the name and the reasoning and do what you like with it, including nothing.
- No phone number needed to start. Give us one if you want to be called; otherwise we write.
- One builder contacts you, not six. And only after you have seen the brief and said yes.
- Your details go to that builder and nobody else. Never sold, never auctioned, never shared with a panel.
- If we have nobody in Onslow, we say so. That is a real answer we give, and the empty builder list above is the proof we mean it.
Building in Onslow?
Licence checked with Building and Energy WA, insurance sighted, still trading, genuinely working in Onslow. If we cannot find one worth recommending, we will say so.
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