How Much Does a Renovation Cost in Perth?

If you’ve started planning a renovation, “how much will this cost?” is almost certainly the first question on your mind — and it’s not an easy one to answer in a single number. Renovation cost in Perth depends on the scope of your project, the age and condition of your existing home, and exactly what you want your finished space to look like.

This guide breaks down the starting prices for second storey additions, ground floor extensions, major renovations and the key factors that push costs up or down.

What Does a Renovation Cost in 2026?

There’s no single, honest answer to “what’s the average renovation cost in Perth” — and any business that gives you one figure for every home is guessing. Every renovation is individually designed and costed around your home, your block, and your brief. As a rough guide, we typically see ground floor extensions and major home renovations starting around $300,000, and second storey additions starting from $380,000.

These are approximate figures, not fixed quotes — no two renovations are the same, as scope is unique to each project. Where your project lands compared to the figures above comes down to the factors below.

What Factors Affect Renovation Costs in Perth

Scope and inclusions

What you want included is the single biggest driver of renovation costs. A standard second storey addition could include a main bedroom, ensuite and living room, whereas larger projects may include a second bathroom, extra bedrooms, or a larger living footprint. The more rooms, fixtures and finishes you include, the higher the investment.

Structural changes

Major renovations on to existing dwellings that involve structural changes to walls, floor or ceilings possibly will require additional engineering to support existing structure so what may seem like a small change on the surface may be involved and carry associated costs.

Working at heights and build method (second storey builds)

Any second storey addition, modular or built on-site, needs to meet Worksafe requirements for working at heights and scaffolding – these requirements will change on each renovation depending on various factors.

If you go with a modular second storey, there are alternative logistics to factor in:

• Traffic management and Western Power escorts, which may be required depending on your location
• Crane hire, with the type and size of crane influenced by your site and the scale of the modular components being lifted into place

These logistics are why modular builds carry their own set of cost considerations on top of the standard requirements for working at heights.

Design complexity and custom design

A renovation or extension that’s designed to blend seamlessly with your existing home — rather than sitting as an obvious “add-on” — takes experience and attention to detail to get right. That investment in design pays off in the final result, but it is a factor in your overall renovation pricing.

Site access and location

Your block’s access, slope, soil conditions and proximity to neighbouring properties can all affect how straightforward (or how involved) construction will be, which in turn affects price.

How Much Should I Budget for a Home Renovation in Perth?

Because every renovation is custom designed and costed, the right way to budget is to treat the rough figures we’ve provided as a starting reference point, not a guaranteed price, and to build in contingency for the inclusions and finishes that matter most to you. To get a true understanding of what your renovations may cost, is to speak to one of our experienced Senior Renovation Designers.

Get an Accurate Renovation Pricing Guide for Your Home

Every home, block and brief is different — the only way to get a genuinely accurate figure is a custom design and quote. If you’re planning a second storey addition, ground floor extension or major renovation in Perth, get in touch with the team at Summit Renovations — we are experts for renovations in Perth, and we’ll walk you through design, approvals and construction from the very first meeting.

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