Cost to Build a House in Perth

What it actually costs to build a house in Perth

The cost to build a house in Perth is driven by four things: the land you are building on, how big the house is, how complicated it is to build, and the level of finish you choose.

Two homes of identical floor area, on two blocks a street apart, can differ significantly in cost. Site works, retaining and specification account for most of that gap.

What we can do is explain how the number is built up. That way you can read a quote properly, and work out where your own project is likely to land. If you would rather skip to a figure for your specific block, get in touch and we will work through it with you.

1. The block and site works

This is the biggest source of surprise in most budgets. In fact, it is the largest single variable in the cost to build a house in Perth.

Slope, retaining, sand pads and fill, rock, groundwater, tree removal and demolition all add cost. So do service connections and difficult access. All of it lands before a single wall goes up.

By contrast, a flat, cleared, serviced lot with easy street access is the cheapest starting point you can have.

2. Size, storeys and footprint

Floor area matters. However, shape matters nearly as much.

A second storey brings structural, stair, access and scaffolding costs. A single-storey home of the same area avoids all of them.

Complex rooflines, long wall runs and lots of corners all cost more. A simple, efficient footprint encloses the same space for less.

3. Specification and finishes

Kitchens, joinery, stone, tiling, tapware, glazing, flooring, doors and hardware cover an enormous range of prices.

Fortunately, this is the part of the budget you control most directly. It is also where the gap between a mid-range and a high-end build mostly lives.

4. Design complexity

Cantilevers, large spans, extensive glazing, voids and suspended slabs all require more engineering and more skilled trade time. So do integrated pools and non-standard materials.

They can be worth it. Even so, they should be costed while the design is still on paper.

What building cost guides do and do not tell you

Building cost guides can be a useful starting point when planning a home in Perth, but broad estimates only tell part of the story. Your construction costs will depend on your design, site conditions, materials and finishes. A realistic budget starts with understanding your block and what you want from your home.

Costs people forget to budget for

Site works and retaining

These are rarely fixed until a contour survey and geotechnical report exist. On a sloping or filled block this line alone can add significantly to the budget.

Approvals and authority fees

Development approval where required, the building permit and the Building Services Levy administered by Building and Energy, the Construction Training Fund levy on higher-value work, plus water and power connections and any shire-specific charges.

Landscaping and external works

Driveways, paths, fencing, retaining outside the building footprint, reticulation, lawn and planting are usually excluded from a build contract and often total more than people expect.

The finishing layer

Window treatments, security screens, letterbox, clothesline, TV and data cabling, appliances beyond the standard package, and furniture. Individually small, collectively significant.

Next steps

The most useful thing you can do is get a realistic figure for the cost to build a house in Perth on your own block, rather than a general one. We look at your site, your brief and your budget together and tell you what is achievable — including when the answer is that a different approach would serve you better.

Read about how our building process works, see completed projects, or learn how long a custom build takes in Perth. We build custom homes across the Perth metro area.