Custom new builds
Your architect's or our designer's plans, built once and built level. Single and double storey, hills blocks and coastal sand.
Typically $2,400–$3,400/m²
Midland · Perth hills to coast
Custom homes and extensions, built level and priced straight.
Ironbark Building Co. runs a tight site: fixed-price contracts, one supervisor from slab to keys, and a payment schedule you can read before you sign. New builds, second storeys and major extensions across the Perth metro.
Registered Building Practitioner BP 00000 HIA member Home indemnity insured
The build, laid open
Five stages. Five claims. No mystery invoices.
Scrub through a WA residential build from slab to practical completion. The house goes up on the drawing; the progress-payment ledger fills beside it — the same staged structure your contract will use.
What we build
Six ways we take a block or a floor plan further.
Honest anchors from the 2026 Perth market. Every job is priced from your drawings and soil test — these ranges are where realistic budgets start, not teaser rates.
Second-storey additions
Go up without moving out — engineered on the existing footprint, with the ground floor liveable for most of the build.
From $320,000
Major extensions
Kitchens, living wings and parents' retreats that read as original — matched rooflines, matched render, one contract.
From $180,000
Structural renovations
Wall removals, steel beams, reconfigured floor plans — engineered, certified and left plumb.
From $95,000
Granny flats
Self-contained ancillary dwellings to 70m² — for parents, adult kids or rental income, approvals handled.
From $165,000
Knock-down rebuilds
Keep the street you love, replace the house that's done. Demolition, site works and the new build under one roof.
Demolition + build from $520,000
18 yrsBuilding across the Perth metro
BP 00000Registered Building Practitioner (placeholder)
Fixed priceSigned before slab — variations in writing only
InsuredHome indemnity + $20M public liability
Owners, after handover
The reviews we'd want to earn.
Demonstration copy — on the live site these would be the client's real, verified reviews.
★★★★★
Our second storey went up while we lived downstairs, and the schedule they pinned to the fridge in week one was the schedule they kept. Two claims came in exactly as quoted; the third was $400 under.
★★★★★
Hills block, sloping site, bushfire zone — three builders passed. Ironbark priced it straight, explained the site costs line by line, and the slab went down within a week of the date on the contract.
★★★★★
The extension matches the 1960s brickwork so well the neighbours ask which part is new. One supervisor the whole way through, and he answered his phone every single time.
Where we build
Hills to coast, from a Midland base.
Our workshop sits in Midland, which puts the scarp, the river corridor and the coast all inside an hour's reach — and means the supervisor is on your site, not on the freeway.
- Midland — HQ
- Mundaring
- Kalamunda
- Ellenbrook
- Guildford
- Bassendean
- Morley
- Mount Lawley
- Subiaco
- Wembley
- Scarborough
- City Beach
- Fremantle
- Victoria Park
Straight answers
The questions every builder should answer before you sign.
How long does a custom build really take?
Longer than the brochure says. From first design meeting to keys, allow 14–20 months: roughly 3–5 months for design, engineering and approvals, then 10–14 months of construction depending on size, site and the season you pour the slab. We put dates in the contract and report against them monthly — but we won't quote you a nine-month fantasy to win the job.
Fixed-price or cost-plus — which do you use?
Fixed-price for almost everything. Once your drawings, engineering and selections are locked, the contract price is the price; variations only happen in writing, priced before the work is done. Cost-plus (a margin over actual costs) can suit genuinely open-ended heritage or structural-unknown work, and if we recommend it we'll show you exactly why and cap the exposure. If a builder pushes cost-plus on a straightforward new build, ask harder questions.
What does your $/m² figure actually include?
Our $2,400–$3,400/m² range covers the full build: site works on a standard block, slab, structure, roof, lockup, full internal fit-out to a quality spec, and painting. It excludes demolition, land, unusually reactive soils, steep-site retaining and pools — the things no honest builder can price without seeing your block and your soil test. The site consult is where the number gets real.
How do progress payments work?
You pay in stages that follow the build — the ledger further up this page shows the shape: a deposit at signing (capped at 6.5% on contracts over $500,000 under WA law), then claims at slab, plate height, roof cover, lockup and practical completion. Each claim is invoiced only when the stage is physically complete, and you're welcome to walk the site before paying. Exact percentages are fixed in your contract before you sign.
Do you build in the hills — bushfire zones, sloping blocks?
Yes — it's half our order book. We build to BAL ratings up to BAL-40, engineer for reactive clay and granite, and price retaining and site works as visible line items rather than burying them in "provisional sums" that balloon later. Our Midland base means hills sites get the same supervision frequency as the flats.
Can we make changes once the build has started?
Yes, through a written variation: we price the change, you approve it, then it's built. What we don't do is verbal "she'll be right" changes that surface as surprises on the final invoice. The earlier a change lands, the cheaper it is — moving a wall on paper costs nothing; moving it after lockup costs real money, and we'll tell you which is which.
Book a site consult
Bring us the block, the plan, or just the idea.
A site consult is 45 minutes on your block or at your kitchen table: what's buildable, what it'll roughly cost, and what order to do things in. No obligation, no design fee until you engage us.
(08) 9000 0220 — Mon–Fri 7:00–4:30Consult request noted.
On the live site, this lands straight in the office diary — and we'd call you within one business day to lock in a time on your block.
Because this is a demonstration page, nothing was actually sent — your details never left this browser.
Demonstration only · no data transmitted