Best builders in the South West: Busselton, Margaret River & Dunsborough, WA (2026)
Table of Contents
These are the best-rated builders working the South West: Busselton, Margaret River, Dunsborough and the surrounding wine and forest country. They're ranked on real Google reviews, not on who paid us. This is a region with two very different building briefs at once, high-end custom homes and renovations for the Margaret River and Dunsborough lifestyle-property market, and steady family-home building and renovating through Busselton and the growth suburbs around it. One thing to know up front: builders collect far fewer Google reviews than plumbers or pest controllers, because most people build or renovate once or twice in a lifetime, so the review counts here look smaller than on our other trade pages. Whatever the job, get a fixed-price contract, a registered builder and home indemnity insurance sighted before any money changes hands.
Featured builders
These spots are for Busselton, Margaret River and Dunsborough builders and renovators who want to stand out on this page. None are taken yet, so the full review-ranked list is right below. That ranking is earned off Google reviews and never for sale. Are you a registered builder or renovation company working the South West? Featured spots start at $50 a year.
⭐ 137 Google reviews behind this list
📍 Busselton, Margaret River & Dunsborough, WA
🔄 Updated monthly
How we ranked these builders
- Google reviews do the ranking. We start with every builder's live Google star rating and the number of reviews behind it, pulled fresh from Google Maps.
- Rating, weighted by volume. A 5.0 off one or two jobs isn't proof yet, so we weight the score by review count. Summit South West carries by far the biggest review base of anyone here (82) at a strong 4.9, and sits below the smaller 5.0-rated builders under our rating-first rule.
- Fewer reviews than other trades, on purpose. People build or renovate rarely, so builders gather far fewer Google reviews than a plumber or a pest controller doing dozens of jobs a week. A builder with 7-25 genuine reviews already has a strong track record for this trade. We've judged these on the builder yardstick, not against the review counts you'd see on our plumbing or pest control pages.
- Serving the region, honestly framed. Cape to Cape Builders, Tolcairn Builders, Kidron Homes and Summit South West are all based in Busselton; Homes By Nature is based in Margaret River. All five genuinely work this region rather than servicing it on paper from Perth.
- Builders, not tradies or suppliers. We only counted businesses doing the actual building or renovation project management, not individual trades or building-material suppliers.
CAPE TO CAPE BUILDERS
Cape to Cape Builders tops the page on a perfect 5.0 across 22 reviews, based right in Busselton on West St. Reviewers call out workmanship and a job finished in the timeframe promised, a good sign for a region where trades can be booked out months ahead.
Homes By Nature
A perfect 5.0 from 17 reviews and based right in Margaret River. Reviewers highlight clear communication through the build, useful in a region where owners are often juggling a build from further afield.
Tolcairn Builders
A clean 5.0 from 9 reviews, based in Busselton. Reviewers call out honesty and transparency at every stage of the build, a smaller local operator with a perfect record so far.
5.0
(7 reviews)
4.9
(82 reviews)
What building and renovation work actually costs in the South West (2026)
| Job | Typical cost | What moves the price |
|---|---|---|
| Bathroom renovation (full strip-out and refit) | $18,000-$40,000 | Layout changes, waterproofing, tiling area, fixtures and tapware, moving plumbing, second-storey access |
| Kitchen renovation (full) | $22,000-$60,000 | Cabinetry and stone, appliances, moving services, structural wall removal, high-end finishes |
| Room addition / rear extension (ground floor) | $2,500-$4,500 / m² | Site access, footings on sloping or rocky hills ground, matching the existing roofline and brickwork, finishes |
| Second-storey addition | $280,000-$600,000+ | Engineering, existing footings, staying in the house during the build, structural upgrades, extra glazing for coastal exposure |
| Whole-house renovation (cosmetic to structural) | $120,000-$400,000+ | Extent of structural work, kitchen and bathrooms, re-wire and re-plumb, age and condition of the home |
| New custom home (build only, per m²) | $2,200-$4,000+ / m² | Single vs double storey, spec level, block slope and soil, coastal exposure, bespoke design |
| Knock-down-rebuild (demolition + new home) | $450,000-$900,000+ | Demolition and site clearing, asbestos removal on older homes, home size and spec, sandy coastal block |
| Granny flat / ancillary dwelling | $120,000-$260,000 | Size, kitchen and bathroom fit-out, connecting services, site access, whether it's transportable or built on site |
| Patio, alfresco or outdoor living | $8,000-$40,000 | Size, roof type, decking, flooring, whether it ties into the house structure |
| Home indemnity insurance (builder arranges, on work over $20k) | Built into contract | Contract value; legally required in WA and passed on in the build price |
The South West carries its own build conditions worth pricing in. Around Margaret River and Dunsborough, larger acreage and lifestyle-property blocks mean site works, access, bushfire attack level (BAL) requirements and effluent/septic disposal can all add real cost on top of the build itself, especially on forested or sloping blocks. Busselton and its growth suburbs are mostly straightforward sandy coastal building ground, keeping site costs more predictable, but salt air near the coast still means it's worth paying for external fixings and finishes that hold up rather than cutting corners. Regional trades and materials also mean call-outs and supply can run a touch higher than metro Perth, and timelines can stretch further out during the region's busy tourist and building season. And whatever the job, the big cost driver is scope creep: every extra decided on-site after the contract is signed is a variation, and variations are what blow out an otherwise sensible budget.
Don't get ripped off: red flags
- Not a registered builder. In WA, residential building work over a set value must be carried out by a builder registered with the Building Services Board. Ask for the registration number and check it on the Building and Energy (DMIRS) register before you sign. An unregistered "builder" leaves you with no proper comeback.
- A deposit over the legal cap. Under WA's home building contract rules the deposit is capped at 6.5% of the contract price. Anyone asking for 10, 20 or 30 per cent up front is breaking the rules and putting your money at risk. Walk away.
- No home indemnity insurance. For residential work over $20,000, the builder must take out home indemnity insurance and give you the certificate before they take a deposit or start. It protects you if they die, disappear or go insolvent mid-build. No certificate, no start.
- No written contract, or a vague one. Building work over the WA threshold needs a proper written contract with a fixed scope, a fixed price or a clear pricing basis, and a schedule of progress payments. A one-page quote with "the rest TBC" is how disputes start.
- Progress payments not tied to stages. You should pay in stages against work completed, deposit, slab, plate height, lock-up, fit-out, practical completion, not big lump sums ahead of the work. Paying well ahead of the build leaves you exposed if it stalls.
- The quote is thousands cheaper than everyone else. On a build, the lowball quote is usually the most expensive in the end, either it's missing scope that comes back as variations, or the finishes are stripped down to hit the number. Compare quotes on identical scope and specification.
- Cash discounts and "start Monday" pressure. A builder pushing a cash deal, no contract, or urgency to sign today is a builder to avoid. Good builders have a waitlist and work to a contract.
- Vague on the building permit. Nearly all structural work needs a building permit from the local council or a private certifier. If a builder shrugs off permits or offers to "do it without", you wear the risk when you sell or insure.
- No allowances spelled out. Watch for "prime cost" and "provisional sum" allowances set artificially low, for tiles, tapware, flooring or site works, so the headline price looks sharp and blows out later. Ask what each allowance assumes.
- Won't give references or show finished work. A builder proud of their work will happily point you to a recent finished home or a client to ring. Reluctance is a tell.
Before you hire: quick checklist
- Registered builder. Confirm the builder or company holds current registration with the WA Building Services Board and check the number on the Building and Energy register. It's a legal requirement for residential work, not a nice-to-have.
- Written contract on the right terms. Get a proper written building contract with a fixed scope, the price or pricing basis, the progress-payment schedule and the finish allowances all spelled out before any money changes hands.
- Deposit within the cap. Check the deposit is no more than 6.5% of the contract price, the WA legal maximum. Anything higher is a warning sign.
- Home indemnity insurance certificate. For work over $20,000, sight the home indemnity insurance certificate before you pay a deposit or let work start.
- Building permit sorted. Confirm who's obtaining the building permit and that it's in place before structural work begins.
- Right builder for the job. Match the builder to the project, a volume new-home builder, a custom builder and a renovation specialist each suit different work. Ask to see a recent finished job like yours.
- Allowances and variations. Understand every prime-cost and provisional-sum allowance, and how variations are priced and approved, before you sign. This is where budgets blow out.
- Recent, specific reviews and references. Look for recent reviews that mention the actual build or reno, and ask for a client or two you can call. A steady stream beats one old burst of five stars.
Frequently asked
How did you rank these builders?
By their live Google star rating and the number of reviews behind it, pulled from Google Maps. We rank by star rating first, and break ties by review volume, which is why Cape to Cape Builders (5.0 from 22 reviews) leads the page ahead of Summit South West, which actually has the biggest review base on the page (82) at a strong 4.9. We checked each business genuinely services the Busselton-Margaret River-Dunsborough area, and flagged which are locally based.
Which areas does this cover?
Busselton, Margaret River, Dunsborough and the surrounding South West wine and forest region. Every business on this page was checked to genuinely service this area.
Are these paid placements?
No. This list is ordered on Google review data. Businesses can pay for a "Featured" spot at the top of the page, clearly marked as Featured, but that never changes where anyone sits in the review-based ranking below it.
Why are the review counts lower than your other trade pages?
Because building and renovating isn't a job most homeowners do more than once or twice in a lifetime. A plumber or pest controller might do dozens of jobs a week and rack up reviews fast; a builder might finish a handful a year. A builder sitting on 7-25 reviews has genuinely done the work to earn them, so we judge this trade on its own yardstick rather than against busier trades.
Does my builder have to be registered in WA?
Yes. Residential building work over a set value in Western Australia must be carried out by a builder registered with the Building Services Board, administered by Building and Energy within DMIRS. You can check a builder's registration on the public register. Always confirm registration before you sign, and be wary of anyone who can't give you a number. This is general information, not legal advice, so check your specific job with Building and Energy WA if you're unsure.
How much deposit can a builder ask for?
Under WA's home building contract rules, the deposit on a residential building contract is capped at 6.5% of the contract price. If a builder asks for more up front, that's a warning sign. After the deposit you should pay in stages against completed work, not in large lump sums ahead of the build. Again, general information rather than legal advice, so check the current rules with Building and Energy WA.
What is home indemnity insurance and do I need it?
Home indemnity insurance protects you, the owner, if your builder dies, disappears or becomes insolvent before the work is finished or a warranty issue arises. In WA it's required for residential building work over $20,000, and the builder must arrange it and give you the certificate before taking a deposit or starting work. Don't let a build begin without sighting that certificate.
Should I get a fixed-price contract?
For most home builds and renovations, a fixed-price contract on a clearly defined scope is the safest way to keep control of your budget. The catch is variations: any change once the build starts is priced as a variation, and that's where a tidy fixed price can blow out. Lock the scope, the finishes and the allowances down in the contract before work begins, and make sure the contract sets out how variations are priced and approved.
How often is this page updated?
Monthly. Ratings and review counts move, new builders earn their spot, and we re-pull the data so the list stays honest and current. As South West builders build up reviews, expect this list to shift.
Are you a builder in Busselton, Margaret River or Dunsborough?
Get in front of homeowners who are ready to build or renovate. Claim your free listing, or ask about a Featured spot on this page.
Last updated: July 2026