Garage Conversion Cost Calculator.Know what it should cost.

A garage conversion in Australia typically costs between $18,000 and $75,000 in 2026, with most projects landing around $38,000. Pricing varies with size, finish level, complexity and your location. Use the calculator above for a range tuned to your project.

Usually yes — converting a garage into habitable space changes its classification under the Building Code. Sleeping rooms and self-contained flats almost always require approval.

It depends on the market. In family-suburb areas, off-street covered parking is often valued; in inner-city areas, an extra room may add more.

Once approvals are in place, a straightforward conversion typically takes 4–8 weeks on site. Adding a bathroom or kitchenette brings in more trades and extends the build, and the approval process itself can add several weeks before work starts.

A standard conversion covers insulating and lining the walls and ceiling, levelling and finishing the floor, replacing the garage door with a framed wall and window, and upgrading power, lighting and ventilation. Landscaping, driveway changes and replacement parking such as a new carport are normally excluded, so check each quote's scope carefully.

Habitable rooms must meet the National Construction Code, which sets minimum ceiling heights and requires natural light, ventilation, insulation and working smoke alarms. Plumbing and electrical work must be done by licensed trades everywhere in Australia. Keep the compliance certificates, as you'll need them for insurance and resale.

Garage slabs usually sit lower than the house floor and slope towards the door, so building up and levelling the floor is one of the most common extras. Damp, cracked slabs, low ceilings and poor drainage all add work, which is why two similar-sized garages can produce very different quotes.