Home Extension Cost in Sydney (2026)
A Sydney extension is the dearest in the country, and sandstone, tight access and approvals are usually why.
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 $599/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 Sydney
Sydney carries the highest trade labour rates nationally, so before a single wall goes up the build component of an extension already runs above every other capital. The sandstone shelf under many suburbs makes excavation for footings, a lower level or a slab harder and dearer, and the city's dense mix of Federation terraces and apartments means extensions often happen on tight blocks with difficult access, or under strata rules that add approval cost and time an owner of a free-standing house never faces.
Heritage and character controls are common across the inner suburbs and can shape what is possible and how it must be detailed, lifting design and documentation cost. Add the highest tip and disposal fees in the country for the demolition and spoil an extension generates, and Sydney sits clearly at the top of the range, with the gap between a modest add-on and an upper-floor addition over rock particularly wide.
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.