Home Extension Cost in Melbourne (2026)
Melbourne's reactive clay and period housing stock are the two forces that set the price of an extension.
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 $577/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 Melbourne
Extensive reactive clay across Melbourne means an extension's footings and slab must be engineered for ground movement, and that engineering is non-negotiable where new work ties into an existing structure that may settle differently. The inner and middle suburbs are dominated by Victorian and Edwardian period homes, so an extension usually has to marry new construction to heritage fabric, match or restore period detail, and work within character controls, all of which lift design and build cost above a plain new structure.
Against that, Melbourne has one of the deepest and most competitive building markets in the country, with abundant builders, chippies and trades, so a well-shopped extension lands at fair value and labour sits just under Sydney. Cold winters push heating, glazing and insulation up the spec, which a quality extension here carries as standard rather than an extra.
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.