Home extensions
Home extensions in Melbournefrom ground floor to second storey
We build home extensions across Melbourne, from single-room additions to second storeys and knockdown rebuilds, and coordinate the permits and approvals. Serving Tarneit, Point Cook, Werribee, Hoppers Crossing, Dandenong and beyond.
Pricing
How much does a home extension cost in Melbourne?
Home extensions in Melbourne generally cost $1,800 to $4,500 or more per square metre, depending on the type of extension, structural complexity and finishes. A 50–80 m² ground-floor extension often lands around $150,000–$250,000, and second storeys cost more because of the extra structural engineering. Your written itemised quote breaks the work down line by line.
| Scope | Indicative Melbourne ranges |
|---|---|
| Ground-floor extension | $1,800 – $3,000/m² |
| Second-storey addition | $2,500 – $4,500/m² |
| Granny flat (60 m²) | $120,000 – $180,000 |
| Knockdown rebuild | $400,000 – $850,000+ |
Prices vary with site conditions, structural requirements, material selections and planning overlays. Ranges are a guide only; your quote is based on your scope.
What we do
Extensions we build
Ground-floor extension
Expand outward for open-plan living, extra bedrooms or a larger kitchen.
Second-storey addition
Build up when you can't build out.
Granny flat / DPU
A dependent person's unit or rental space, self-contained and built with the approvals it needs.
Knockdown rebuild
Start fresh on your existing block with a new home — see our new home builds.
Garage conversion
Turn an under-used garage into living space, a home office or a studio.
Finishes & details
The kind of finish to expect
How it works
How an extension runs
- 01
Free consultation
Site visit, your brief and an initial feasibility check.
- 02
Design & permits
A written itemised quote for the agreed scope plus architectural plans and council submissions
- 03
Site preparation
Demolition if needed, excavation and footings.
- 04
Structural frame
Timber or steel frame erected and roof installed.
- 05
Lock-up
External cladding, windows and doors — weather-tight.
- 06
Internal fit-out
Plumbing, electrical, plastering, flooring and painting.
- 07
Finishing & fixtures
Kitchen, bathroom, cabinetry and final touches.
- 08
Handover
Final inspection and the required completion paperwork, then a full walkthrough.
FAQ
Common questions
Comparing quotes? Our checklist shows what a complete renovation quote should include.
Do I need a building permit for a home extension?
Yes — home extensions in Victoria need a building permit, and many also need a planning permit depending on overlays, setbacks and scope. We coordinate the permit applications, council liaison and documentation, and your quote shows what's included.
How long does a home extension take?
A standard ground-floor extension typically takes 12–16 weeks from slab to handover, second storeys 16–24 weeks and knockdown rebuilds 6–9 months. Planning permit times vary by council and application, so ask your council or surveyor for current estimates.
Can I live at home during the extension?
For ground-floor extensions, usually yes, with dust and noise management. For second storeys you can often stay during the early stages but may need to move out for a few weeks while the roof is off and structural work is under way. We'll advise case by case.
How much does a home extension cost per square metre?
Ground-floor extensions typically cost $1,800–$3,000/m² depending on finishes. Second storeys range from $2,500–$4,500/m² because of the extra structural work. These are guide prices — every project is quoted individually with line-item pricing.
Do you handle council approvals?
Yes. We coordinate architectural drawings, engineering, energy ratings and council submissions with your building surveyor and council — for example Wyndham City, Casey, Hume or Brimbank.
What's included in your quote?
Everything from demolition to handover: structural engineering, permits, all trades (framing, plumbing, electrical, plastering, tiling, painting), project management, site supervision and rubbish removal. Fixtures and fittings are selected by you within agreed allowances.
How do I get started?
Request a free quote online or call us. We'll reply to arrange a site visit, then send you a written quote for the agreed scope.
Ready to extend your home?
Free consultation and a written itemised quote.
Planning a home extension?
Related services
Home extensions across Melbourne's west and southeast
Local information for some of the suburbs we service: