The short version
Ask any roofer how long a re-roof takes and the honest answer starts with "it depends". That is not a dodge. Two houses on the same street can have very different jobs ahead of them once the old roof comes off.
As a rough guide for a standard single-storey suburban house in Perth:
- Steel to steel (for example, old corrugated iron to COLORBOND steel) often takes around three to five working days on site.
- Tile to steel is typically in a similar range, sometimes a day or two longer because of the weight and volume of tiles to remove.
- Tile to tile usually takes longer again, often around a week or more, because tiles are laid individually and ridge capping is bedded and pointed by hand.
- Asbestos cement to steel adds a separate removal stage before the new roof goes on, which can add a day or more.
Two-storey homes, steep pitches, complex roof shapes with lots of hips and valleys, and larger floor areas all push those figures out. Treat every number here as a typical range, not a promise.
Before anyone climbs a ladder
The days on the roof are only part of the story. Most of the calendar time in a roof replacement is spent before the crew arrives.
Inspection and quoting
Your roofer needs to see the roof, and ideally the roof space, before pricing the job. That visit is usually short, but getting several quotes and comparing them can take a couple of weeks. If you want to know what a roofer looks at, our guide on what happens during a roof inspection walks through it.
Permits and approvals
In WA, building work is regulated under the Building Act 2011, and your local government is the permit authority. A straight like-for-like re-roof may not need a building permit, but structural changes, a different roof form or a switch to a heavier material often will. If a permit is required, the processing period becomes part of your timeline. Our article on whether your roof needs a building permit in WA covers the questions to ask, and the safe step is always to check with your local government's building services before work starts.
Materials and scheduling
Popular COLORBOND colours and profiles are usually easy to source, but less common colours, specific tile ranges and custom flashings can take longer. Your roofer also has to fit you into their schedule, which tends to be tighter in the run-up to winter.
What a typical week on site looks like
Every crew works a little differently, but most re-roofs follow a similar pattern. The table below shows how the work is often divided on a straightforward single-storey job.
| Stage | What happens | Typical share of the job |
|---|---|---|
| Set-up | Scaffolding or edge protection, skip bin, material delivery | Part of day one |
| Strip-off | Old sheets or tiles removed, a section at a time | One to two days |
| Repairs | Battens, fascia and any damaged timber fixed or replaced | Varies widely |
| Underlay | Sarking or a roof blanket laid over the battens | Usually alongside install |
| Install | New sheets or tiles fixed, valleys, flashings and ridge capping finished | Two to four days |
| Finish | Gutters and downpipes refitted or replaced, clean-up, final check | Part of the last day |
Good crews strip and re-cover the roof in sections so the house is never left open overnight. That approach can look slower on paper, but it protects your ceilings and contents. For a fuller explanation of each step, see our roof replacement process guide.
What makes a re-roof take longer
If your job runs over the typical range, it is usually for one of the reasons below. None of them mean anything has gone wrong; they are just things nobody can fully see until work begins.
Weather
Perth's wet season runs roughly from May to September, and winter cold fronts can bring strong winds and heavy showers. Roofers will not strip a large area with rain on the way, and high winds make handling long steel sheets unsafe. Summer brings its own problems: on long runs of 35-degree days, crews often start at first light and stop early in the afternoon. A job that would take four days in October might stretch across two weeks in July.
Asbestos
Many Perth homes and sheds built between the 1950s and 1980s have asbestos cement roofing. WorkSafe WA requires a licensed asbestos removalist for removing more than 10 square metres of non-friable asbestos, so the removal is a separate, regulated stage with its own preparation, wrapping, disposal and sometimes clearance steps. Our asbestos roof replacement page explains how this usually fits into the wider project.
Hidden structural problems
Once tiles or sheets are off, the crew may find rotten battens, termite damage, sagging rafters or fascia boards that have softened from years of overflowing gutters. These need fixing before a new roof goes on, and serious structural work may need an engineer's input or a permit. This is the single most common reason a re-roof runs past its expected finish date.
Access and roof complexity
A simple gable roof on a flat block is the quickest kind of job. Add a second storey, a steep pitch, a narrow side setback, a pool next to the house or a dozen valleys and hips, and everything slows down. Scaffolding takes longer to set up, materials take longer to lift, and every intersection needs careful flashing.
Changing materials
Going from tiles to steel is common in Perth and usually straightforward, but it may involve new battens at different spacings, a roof blanket for insulation and noise, and new flashings at walls and chimneys. Going the other way, from steel to tiles, is less common and can involve checking whether the frame can carry the extra load.
How to keep your project on track
You cannot control the weather, but you can avoid most of the delays that come from planning.
- Get quotes early. Starting the process in late summer or early autumn gives you a better chance of finishing before winter.
- Ask about a roof space inspection. A roofer who has looked inside the ceiling is less likely to be surprised by what they find.
- Sort out permits first. Confirm with your local government whether approval is needed before booking a start date.
- Choose materials promptly. Settling on a colour and profile early lets your roofer order without holding up the schedule. Bring home a few samples and look at them in your own light.
- Clear the site. Move cars, outdoor furniture and pot plants away from the house, and give the crew clear access along the sides.
- Agree how variations are handled. Ask in advance how extra work, such as replacing rotten battens, will be quoted and approved, so decisions do not stall the job.
It also helps to choose your roofer carefully. We ask the contractors we work with to hold the registrations and insurance the job needs, and you should ask to see them before work starts. Our guide on how to choose the right roofing contractor in Perth has a checklist of questions worth asking about scheduling.
Thinking about cost alongside time
Longer jobs usually cost more, because labour, scaffolding hire and skip bins are all time-based. Asbestos removal and structural repairs add both days and expense. Rather than guessing, have a look at our roof replacement cost guide to understand what drives the price of a typical Perth re-roof.
Get a timeframe for your own roof
The only way to know how long your re-roof will take is to have someone look at it. Roofing Perth can arrange a free, no-obligation on-site quote from a local contractor, who can give you a realistic schedule based on your roof's size, condition and material. Request your quote here.