community
Builders in Perth 2026, Home Extensions, Renovations, Cost Guide, and How to Find a Licensed Builder Near You
Perth builder guide 2026: how much home extensions, alfresco additions, and full renovations cost in Perth, DEMIRS builder licence requirements, R-Code setback rules, and how to get accurate quotes for your Perth renovation project.
How we reported this
Builders in Perth 2026
Perth has a buoyant residential building industry driven by a strong economy and population growth. All building work in WA must be performed by a DEMIRS-registered builder. Perth's outdoor lifestyle drives strong demand for alfresco additions, patio enclosures, pool-house builds, and rear extensions that open onto outdoor entertaining. demirs.wa.gov.au
How Much Does a Home Extension Cost in Perth 2026?
- Single-storey rear extension (30sqm, basic), typically $65,000-$118,000 in Perth
- Single-storey rear extension (30sqm, mid-range), typically $112,000-$172,000 in Perth
- Second-storey addition (full floor, approx 100sqm), typically $228,000-$368,000 in Perth
- Granny flat / ancillary dwelling (60sqm), typically $128,000-$205,000 in Perth
- Alfresco addition (covered, 30sqm), typically $38,000-$82,000 in Perth
- Kitchen renovation (mid-range), typically $22,000-$55,000 in Perth
- Bathroom renovation (mid-range), typically $14,000-$34,000 in Perth
Perth Alfresco Additions and R-Code Rules
Perth's outdoor-living culture makes alfresco additions one of the most popular builder requests in WA. Alfresco additions within residential zones must comply with WA's R-Codes (Residential Design Codes) for setbacks, site coverage, and open space. Most Perth councils allow patios and pergolas as exempt development under certain size and setback limits. DEMIRS builder registration required for enclosed structures. demirs.wa.gov.au
This article was compiled by AI and screened before publishing. See our editorial standards.