Most Perth renovations run longer than the homeowner expected, and in most cases the builder’s construction estimate was accurate. The gap sits either side of construction — design, approvals, procurement, and the weeks lost to decisions nobody made on time.
A related guide to consider while planning this work is How Long Does a Kitchen Renovation Take?.
Perth adds three variables the eastern states do not have in the same form: a choice between two building permit routes with a fifteen-day difference in processing time, masonry construction that is inherently slower than framing, and geographic isolation that adds freight time to anything not held locally.
End-to-End Timelines by Project Type
Bathroom renovation
- Design and product selection — 2 to 6 weeks
- Builder availability and booking — 4 to 12 weeks
- Building permit, where required — 10 to 25 business days depending on route
- Construction on site — 3 to 4 weeks
- Total: 2 to 5 months
Kitchen renovation, no structural work
- Design and cabinetmaker documentation — 3 to 6 weeks
- Joinery manufacture — 4 to 6 weeks after site measure
- Construction on site — 4 to 6 weeks, including a 7 to 10 day pause for stone templating
- Total: 3 to 4 months
Kitchen renovation with a load-bearing wall removed
- Design and structural engineering — 4 to 8 weeks
- Certified building permit — about 10 business days
- Demolition, propping, steel installation and making good — 2 to 4 weeks
- Joinery manufacture and installation — 6 to 9 weeks
- Total: 4 to 6 months
Whole-house cosmetic renovation
- Planning and selections — 4 to 8 weeks
- Construction — 8 to 14 weeks
- Total: 4 to 6 months
Covered alfresco or patio
- Design and documentation — 3 to 8 weeks
- Building permit — 10 to 25 business days
- Planning approval if deemed-to-comply is not met — 60 to 90 days
- Construction — 3 to 8 weeks
- Total: 3 to 5 months, or 6 to 9 months if planning approval is triggered
Ground-floor extension, deemed-to-comply
- Design and documentation — 8 to 16 weeks
- Certified building permit — about 10 business days
- Tender and contract — 4 to 8 weeks
- Construction — 16 to 28 weeks
- Total: 6 to 12 months
Extension requiring planning approval
- Design and documentation — 10 to 20 weeks
- Planning approval — 60 to 90 days
- Certified building permit — about 10 business days
- Tender and contract — 4 to 8 weeks
- Construction — 16 to 28 weeks
- Total: 9 to 18 months
Second-storey addition
- Structural assessment of existing walls and footings — 2 to 4 weeks
- Design and documentation — 12 to 22 weeks
- Planning approval, usually required — 60 to 90 days
- Certified building permit — 2 to 3 weeks
- Tender and contract — 4 to 8 weeks
- Construction — 26 to 42 weeks
- Total: 12 to 22 months
Where the Time Actually Goes
The permit route decision
A genuinely Perth-specific lever. A certified building permit (BA1), where a private building surveyor issues a certificate of design compliance, is processed by the local government in up to 10 business days. An uncertified permit (BA2), lodged directly, takes up to 25 business days.
That is three additional weeks for the sake of avoiding a building surveyor’s fee. On any project with a construction programme attached, the certified route is almost always the right choice — and for structural work it is generally the only option.
The planning approval question
The larger variable. Work designed within the deemed-to-comply provisions of the Residential Design Codes needs only a building permit. Work that departs from them requires planning approval, which takes up to 60 days, or 90 with neighbour consultation.
The triggers to check before designing:
- Setbacks against your R-Code density coding
- Building and wall height
- Site coverage and open space
- Boundary wall length and height
- Overshadowing and privacy
- Heritage listing or a heritage area
- Bushfire prone areas and special control areas
Ask your designer to demonstrate deemed-to-comply compliance clause by clause. It is worth two to three months. See our guide to Perth approvals.
Masonry is slower than framing
The structural reality of building in Perth. Bricklaying is labour-intensive, weather-dependent and paced by mortar cure rather than by how fast someone can swing a nail gun.
Practical consequences:
- A double-brick extension takes longer to reach lock-up than a framed one of the same size
- Removing a load-bearing brick wall takes days rather than hours — propping, needling, brick-by-brick removal, steel installation, packing, and making good
- Chasing services into masonry is slower than running them through a stud wall
- Bricklayers are periodically in short supply during construction booms, and a trade shortage shows up directly in your programme
- Masonry demolition generates far more waste tonnage, and waste handling takes time
Budget more programme for a masonry renovation than the equivalent eastern-states figure would suggest.
Freight and isolation
A real Perth consideration that owners from other cities underestimate. Anything not held locally comes across the Nullarbor, and that adds a week or two to many lead times.
A related guide to consider while planning this work is How Much Does a Home Renovation Cost in Perth? A 2026 Price Guide.
- Custom joinery — 4 to 8 weeks after site measure, generally made locally
- Stone and porcelain benchtops — 2 to 5 weeks from template, but slab selection is more limited than in eastern capitals and specialty material may need to be freighted
- Imported and specialty tiles — 8 to 16 weeks if not in local stock
- Specified tapware in a non-standard finish — 6 to 14 weeks
- Windows and doors, custom sizes — 6 to 14 weeks
- Frameless shower screens — 2 to 3 weeks after tiling completes, made locally
- Structural steel — 3 to 6 weeks
- Matched roof tiles — Perth profiles are frequently discontinued; salvage sourcing can take weeks
- Appliances — check local stock before specifying; a model available next week in Sydney may be six weeks away in Perth
The practical rule: choose from what is held locally where you can, and order anything that is not before demolition rather than during construction.
Summer heat
Perth’s extended heat affects the programme in ways that are easy to overlook. External work in a run of 40-degree days slows for genuine safety reasons, roof work becomes difficult, and concrete and render need care in extreme heat. Most contracts allow extensions of time for inclement weather, and extreme heat qualifies.
Where possible, schedule roofing and external masonry work outside the peak of summer.
The Christmas shutdown
The construction industry effectively closes from mid-December to mid or late January — which in Perth coincides with the hottest part of the year. A project that has not reached a sensible pause point by early December loses six weeks, and materials ordered in November may not arrive until February.
Discovery
Perth’s housing stock reveals problems when opened, though less dramatically than the timber cities. The recurring items: asbestos, corroded galvanised plumbing, salt damp behind render, corroded wall ties in coastal properties, under-slab plumbing at end of life, and walls that turn out to be load-bearing when the plan assumed otherwise.
Allow two to four weeks of programme for what will be found in any pre-1980 home.
Owner decisions
Owner indecision is among the largest causes of delay on residential projects, and under standard contracts it entitles the builder to an extension of time. Complete all selections before construction starts — every tile, tap, handle and paint colour, documented in a schedule.
A Realistic Construction Sequence
For a Perth double-brick renovation with an opened floor plan and a rear alfresco:
- Weeks 1–2 — site establishment, dust containment, strip-out of finishes
- Weeks 3–5 — propping, structural steel installation, load-bearing wall removal, making good
- Weeks 6–8 — new openings, lintels, brickwork adjustments
- Weeks 9–12 — services rough-in including chasing into masonry, cavity insulation, surveyor inspections
- Weeks 13–15 — plastering and rendering, ceiling insulation
- Weeks 16–19 — waterproofing to wet areas, tiling
- Weeks 20–23 — joinery installation, stone templating and fitting
- Weeks 24–26 — painting, flooring, fit-off of plumbing and electrical
- Weeks 27–30 — alfresco construction, landscaping, making good, cleaning and defects
Note the dependencies. The structural work comes first because everything else attaches to the result. Waterproofing cannot start until linings are complete. Tiling cannot start until the membrane has cured — and Perth’s dry heat can deceive an inexperienced applicator into rushing that. The shower screen cannot be measured until tiling is finished.
Reading the Builder’s Programme
Ask for a construction programme showing each trade’s period on site and the dependencies. Specifically request:
- The critical path — where any delay pushes completion
- Owner decision points marked with the date each selection is needed. This single request prevents most owner-caused delay.
- Procurement dates for each long-lead item, with freight time allowed for anything from the eastern states
- Building surveyor inspection hold points
- Allowances for extreme heat and the Christmas shutdown
- The bricklayer’s availability, which on a masonry project is frequently the constraint
Extensions of Time
Standard contracts entitle the builder to an extension of time for defined events: inclement weather including extreme heat, variations you instruct, delay in your decisions, latent site conditions such as asbestos or salt damp, delays in approvals or inspections beyond their control, material shortages in some contract forms, and the statutory shutdown.
The contract specifies how a claim must be made, usually in writing within a set number of days. The entitlement is generally to time rather than automatically to money. A builder who simply runs late without claiming has not extended the date.
Scheduling Around the Perth Year
- Ideal: start in late summer or autumn, structural and masonry work through the mild months, lock-up before winter, internal work through winter and spring, alfresco and landscaping in spring.
- Workable: start in winter, accepting some weather delay on external work, finishing internally through spring.
- Difficult: external masonry and roofing work scheduled through January and February.
- Avoid: a November start, which reaches demolition just as the industry shuts down and the heat arrives.
Landscaping is the other seasonal consideration. Planting in autumn or early winter establishes far better in Perth’s sandy soils than planting into a dry summer, and water restrictions limit establishment watering.
Living Through It
Occupying a house during a masonry renovation is harder than during a framed one, and the main reason is dust.
- Masonry demolition generates enormous dust. Brick and mortar dust is fine, pervasive and gets everywhere. Agree the containment approach with the builder in writing before work starts — sealed barriers, negative-pressure extraction, and daily clean-down.
- Chasing services into brick produces dust over an extended period, not just during demolition.
- Summer occupancy is harder, because the house cannot be sealed and air-conditioned while walls are open.
- Structural work requires vacating the affected area entirely while propping is in place.
- Storage — $180 to $400 per month for a typical household
- Temporary accommodation — $2,000 to $5,000 per month for a Perth family home
Two weeks of accommodation during the structural and chasing phases often costs less than the programme extension caused by working around a household — and considerably less than the decisions made by people living in brick dust.
The Last Ten Per Cent
The final stage consistently takes longer than expected. Fit-off, painting touch-ups, the shower screen measured after tiling, the joinery adjustment, the surveyor’s final inspection, and the defects list.
Allow three to six weeks between “it looks finished” and “it is finished”. Building that into your expectations prevents the frustration that otherwise dominates the end of an otherwise successful project.
The Perth renovations that finish close to programme are not the ones with the fastest builders. They are the ones where the design met the deemed-to-comply provisions, the certified permit route was used, the structural engineering was resolved before demolition, and everything not held locally was ordered before the first brick came out.
Why Perth Projects Slip
Looking across projects that ran materially over, the causes cluster:
- Planning approval nobody anticipated, because the design breached a deemed-to-comply provision — typically two to three months
- The uncertified permit route chosen to save a fee — three weeks
- Structural design resolved after demolition rather than before, which in masonry stops the job entirely while an engineer is engaged
- Long-lead items ordered after demolition, with eastern-states freight adding weeks at the back end
- Bricklayer availability during a construction boom
- Owner selections made during construction rather than before — cumulatively four to ten weeks
- A missed surveyor inspection requiring completed masonry work to be opened up
Five of those seven are entirely within the owner’s control, and four are resolved before a builder is engaged.
Reading the Builder’s Programme
Ask for a construction programme showing each trade’s period on site and the dependencies between them. Specifically request:
- The critical path — the sequence where any delay pushes completion
- Owner decision points marked with the date each selection is needed
- Procurement dates for each long-lead item, with freight allowed for anything from the eastern states
- Building surveyor inspection hold points, which stop work until cleared
- The bricklayer’s and steel fixer’s booked periods, which on a masonry project are frequently the constraint
- Allowances for extreme heat and the Christmas shutdown
Ask for it to be updated monthly and reviewed at your site meeting. A builder who cannot produce or maintain one is telling you how the project will be run.
The Last Ten Per Cent
The final stage of a Perth renovation consistently takes longer than anyone expects. Fit-off, painting touch-ups, the shower screen measured after tiling, the joinery adjustment, the surveyor’s final inspection, and the defects list.
Allow three to six weeks between “it looks finished” and “it is finished”. Building that into your expectations prevents the frustration that otherwise dominates the end of an otherwise successful project — and it is the period in which pressuring a builder to finish produces the worst quality decisions of the whole job.
One Perth note on defects: schedule a formal inspection after the first full summer. Sealant failure under UV, shading system performance, cooling capacity and thermal movement in large glazed assemblies only reveal themselves in a genuine heatwave. Reporting within the defects liability period and the six-year Home Indemnity period matters.