Home Extension Cost in Brisbane (2026)
Brisbane's elevated Queenslanders make building-under the natural extension, and termites set the ground rules.
Your home extension details
Approximate added floor area in square metres.
Your estimate sits within the typical range.
Site access, slope and connecting to existing services can add tens of thousands, get a site assessment early.
Where the money goes
Estimated breakdown for your configuration
💰 Ways to save
- Single-storey on a flat, accessible block is the cheapest way to add space.
- A simpler roofline and standard ceiling heights keep costs down.
or from $543/week over 5 years , indicative finance
How we estimate this
Home extensions in Australia are typically priced per square metre, about $2,400/m² for a basic single-storey addition to $4,500/m²+ for premium or double-storey work in 2026.
Pricing reviewed: June 2026.
What a home extension costs in Brisbane
The iconic timber-and-tin Queenslander sits high on stumps, so a great many Brisbane extensions build in underneath rather than out, turning an under-house void into living space. That is often cheaper per square metre than a ground-up addition because the roof and structure already exist, though it brings its own work in waterproofing, drainage, ceiling height and bringing the new space up to habitable standard. Post-war lowset brick homes extend out at grade more conventionally.
High termite pressure makes treated framing, barriers and clearances a genuine cost in any timber extension, and the subtropical climate drives ventilation, insulation and a storm-worthy roof detail. Labour sits around the national baseline in a well-supplied capital, so Brisbane extends more cheaply than the southern capitals for the same scope, with the home's elevated structure often working in the owner's favour.
Compare against the national picture: Home Extension Cost in Australia →
Home Extension Cost in other cities
Frequently asked questions
How much does a home extension cost per square metre in Australia?
In 2026, single-storey extensions typically cost $2,400–$3,500/m² and double-storey $3,500–$4,500/m²+, depending on finish and site conditions.
Is it cheaper to extend or move house?
Extending avoids stamp duty, agent fees and moving costs. For many families a well-planned extension adds value above its cost, though this varies by suburb.
Do I need council approval for a home extension?
Most extensions need development approval or a complying development certificate. Requirements vary by state and council, your builder or a private certifier can advise.