Building Permit WA 2026: Complete Guide for Homeowners and Owner-Builders
Summary
In Western Australia you apply for a building permit through your local government, but in most cases a private building surveyor issues the certificate of design compliance first. That certificate is the real bottleneck, not the council. Budget $1,200 to $3,500 for certification on a house extension or granny flat, plus a council permit fee of 0.32% of the estimated construction value (minimum around $115) and the Building Services Levy at 0.137% on work over $45,000. A certified application must be decided in 10 business days. An uncertified one gets 25. Owner-builders also need an owner-builder approval from the Building and Energy division of DMIRS before the permit can issue, and that approval is where most of the lost weeks actually sit.
Table of Contents
Last year we drew a rear extension for a couple in Bayswater who had already paid a deposit to a builder, then decided to take it on themselves once the quote came back at $340,000. Reasonable decision. They rang us in March expecting to be on site by May. They got their permit in September. Nothing went wrong. No refusal, no objection, no fight with the shire. They just hadn’t accounted for owner-builder approval, a bushfire attack level assessment that nobody had mentioned, or the fact that the certificate of design compliance can’t be signed until every consultant report is complete and consistent with the drawings.
That’s the pattern in WA. The permit itself is fast on paper. Ten business days for a certified application under the Building Act 2011. The work that has to happen before you’re allowed to submit is what eats the calendar, and it isn’t advertised anywhere. So this is the honest version: what the permit costs, what the sequence looks like, and which stages consistently run longer than owner-builders expect.
The WA system is split in two, and that changes everything
Most states run approvals through the council. WA doesn’t, quite. Your local government (city, town, or shire) issues the building permit, but it does not usually assess whether your design complies with the National Construction Code. That job belongs to a building surveyor, and on residential work you’ll almost always be paying a private one.
The surveyor issues a certificate of design compliance (CDC). You then lodge that certificate with the council as part of a certified application, and the council’s role becomes largely administrative: check the paperwork, check the fees, check that you have the right to build there, issue the permit. That’s the 10-business-day pathway.
The alternative is an uncertified application, where the council’s own surveyor does the compliance assessment. It exists mainly for single houses and outbuildings. It takes 25 business days by statute and often longer in practice, and the fee is higher at 0.32% with a $105 minimum plus their assessment time. We recommend certified for almost every project we draw. You control the surveyor, so you control the response time.
What it costs and how long it takes
Before the table, one thing worth being blunt about. The council fee is the number people search for, and it’s the smallest number in the list. A $250,000 extension attracts roughly $800 in council permit fees. The certification, the consultant reports, and the drafting are multiples of that.
| Item | Typical WA cost (2026) | Statutory or practical timeframe |
|---|---|---|
| Certificate of design compliance (private surveyor) | $1,200 – $3,500 residential | 5 – 20 business days after complete documents |
| Council building permit fee (certified) | 0.19% of construction value, minimum $110 | 10 business days |
| Council building permit fee (uncertified) | 0.32% of construction value, minimum $115 | 25 business days |
| Building Services Levy (work over $45,000) | 0.137% of construction value | Paid at lodgement |
| Construction Training Fund levy (work over $20,000) | 0.2% of construction value | Paid before permit issues |
| Owner-builder approval (Building and Energy) | $147 application fee | 4 – 8 weeks |
| Development approval, where required | $150 – $2,500 depending on value | 6 – 12 weeks |
| Structural engineering | $1,800 – $4,500 | 2 – 4 weeks |
| BAL assessment (bushfire prone areas) | $450 – $1,200 | 1 – 2 weeks |
| Energy efficiency assessment (NCC 7 star) | $500 – $1,100 | 1 – 2 weeks |
Add it up honestly for a granny flat or a decent extension and the pre-construction paperwork sits between $6,000 and $14,000 before a single brick is laid. That is not a hidden cost. It’s just one nobody quotes you up front.
Stage by stage, from concept to permit in hand
The sequence matters more than the individual durations, because most of these stages can’t run in parallel. A surveyor can’t certify drawings that reference an engineering design that doesn’t exist yet.
Stage 1: Work out whether you need development approval first (1 to 3 weeks)
A building permit is not planning permission. In WA, development approval (DA) sits under the local planning scheme and the Residential Design Codes, and it’s assessed separately by the same council. If your project meets every deemed-to-comply provision in R-Codes Volume 1 (setbacks, boundary walls, open space, plot ratio, car parking, overshadowing), you can often skip DA entirely and go straight to building permit. Miss one provision and you’re in a design review process that adds 6 to 12 weeks.
The provisions that catch people are boundary setbacks on narrow lots, outdoor living area orientation, and the 50% front setback averaging rule in older suburbs. Check this before you commission drawings. We do it at concept stage for exactly that reason. Redrawing a design because the western setback is 300mm short is a waste of everyone’s money.
Stage 2: Owner-builder approval, if you’re not using a registered builder (4 to 8 weeks)
For work over $20,000 on a single dwelling, you either engage a registered building contractor or you apply to Building and Energy for owner-builder approval. You must own the land, you can’t have held an approval in the last six years, and you must intend to occupy the dwelling. The application costs $147.
Start this the day you decide to owner-build. It runs independently of the design work, and the permit cannot issue without it. We’ve watched more projects stall here than anywhere else in the WA process.
Stage 3: Drawings, consultants, and documentation (4 to 8 weeks)
This is where the actual design happens: floor plans, elevations, sections, site plan with levels, wall and roof construction details, window schedules, and the drainage layout. Running alongside it, the structural engineer sizes footings, beams, and lintels, the energy assessor runs the NatHERS or elemental compliance path against NCC 2022’s 7-star requirement, and if your block is mapped bushfire prone you need an accredited BAL assessment.
Realistically, a two-bedroom granny flat is 4 weeks of documentation. A two-storey addition on a sloping Mount Lawley block is 8, sometimes more once retaining and existing-structure surveys get involved. We would rather tell you 8 and deliver in 6 than the reverse.
Stage 4: Certificate of design compliance (1 to 4 weeks)
The surveyor checks the whole package against the NCC and the Building Act. If something’s missing or inconsistent, it comes back for amendment, and that loop is what turns a 5-day certification into a 4-week one. Complete documentation is the entire game here.
Stage 5: Council lodgement and permit issue (2 to 5 weeks)
Certified applications must be determined in 10 business days. In practice, a clean lodgement at most Perth metro councils lands between 8 and 20 business days, because the clock pauses whenever they request further information. Common requests: proof of ownership, a signed consent from an adjoining owner for a boundary wall, or evidence of the Construction Training Fund levy payment.
Owner-builder budget checklist. Every fee, levy, consultant, and connection cost on this page, in a spreadsheet you can actually work from. Grab the owner-builder budget checklist before you set your contingency.
Where owner-builders lose the weeks
The frustrating part is that the delays are almost never technical. In seven years of drawing plans for owner-builders across four states, we can count on one hand the projects that were genuinely refused on design grounds. What kills timelines is sequence.
Three examples. Someone commissions drawings, then discovers at certification that their block needs a BAL rating, so the wall construction has to change and the drawings go back for revision. Someone lodges before their owner-builder approval comes through, and the council holds the file for six weeks doing nothing. Someone assumes a septic or a sewer connection is a plumbing detail to sort out later, then finds the Water Corporation needs a separate application that takes a month.
None of that is complicated. It’s just ordering.
The other pattern is the quote that flatters you. If a supplier hands you a granny flat package price and tells you approvals are “included,” ask what the number is. Ask whether it covers certification, the two levies, the BAL report, and the energy assessment. Ask whether owner-builder approval is your job or theirs. A package price with no line items behind it is the same as a $49 flight that becomes $310 once you’ve added a bag and a seat. The advertised figure isn’t a lie. It’s just not the figure you’ll pay.
What Draftee does. We’re a drafting firm. We produce the documentation your building surveyor and council need: measured plans, elevations, sections, construction details, site plans, and the consultant coordination that holds it together. We draw the plans, we don’t sell buildings. That means we have no reason to talk you into a bigger footprint, a particular supplier, or a design you didn’t ask for. If a smaller build gets you the same outcome for less money, we’ll say so, and we’ll still get paid the same.
How to keep the application moving
The single most useful thing you can do is front-load the unknowns. Not the design, the constraints.
Order a Certificate of Title and a sewer location plan from Landgate and the Water Corporation before you brief anyone. Check the council’s online mapping for bushfire prone designation, heritage listing, tree preservation, and acid sulfate soils. Get a contour and feature survey if your block has more than 500mm of fall across the building envelope. That’s maybe $1,500 and two weeks spent before design starts, and it removes the majority of mid-project surprises.
Then lodge the owner-builder application immediately, even if your drawings are three months away. It costs $147 and it runs in the background.
And when the surveyor or the council asks for further information, answer the same week. Every request pauses the statutory clock, so a three-day reply and a three-week reply produce very different permit dates from identical applications. Not sure whether your project even triggers a permit? Run it through our permit checker before you spend money on anything.
Approvals in WA aren’t slow. People are just sequential when they could be parallel.
Ready to draw? Send us your block details, your rough idea, and whatever survey or title documents you already have. We’ll tell you what documentation your project needs, what it will cost, and how long it will take. No sales call. Tell us about your block.
Continue Your Research
House Extension Cost 2026: A Realistic Guide to Building Costs
1 Bedroom Granny Flats WA Price List 2026: Real Costs for a Perth Ancillary Dwelling
Shed to Granny Flat Conversion 2026: What You Need to Know
Draftee provides architectural drafting and documentation services. We are not lawyers, building surveyors, or builders, and nothing on this page is legal, planning, or construction advice. Regulatory requirements, fees, and timeframes change and are applied differently by each local government, so verify every detail with your council and your registered building surveyor before you commit money to a project.
Last updated and changelog
Last updated: 19 August 2026
Changelog:
– 19 August 2026: Initial publication
