Free instant estimate
Frankston granny flat cost calculator
Set the size and options below for a rough turnkey price on a Frankston granny flat. Treat it as a guide: a firm quote follows a site visit that checks access, soil, services and council rules.
What sits behind the estimate
- It is a turnkey figure covering design, engineering, council or certifier approvals and a standard fit-out of kitchen, bathroom, flooring and painting.
- It assumes a flat block with good access, reasonable soil, and power, water and sewer within about 10 metres.
- The figures are a guide and usually exclude GST. A firm price depends on the site, the state and council rules, and your choice of finish.
- Landscaping, driveways, decks, fencing, pools and tree removal outside the building footprint are not included.
- Major retaining walls, bushfire (BAL) or flood upgrades and long service runs are only counted when you tick a site extra above.
Questions about the estimate
How much does a granny flat cost in Frankston?
Built turnkey, a Frankston granny flat typically costs $1,900 to $2,600 per square metre in 2026. For a 60 m² two-bedroom flat that works out at roughly $118,000-$164,000, depending on the finish and the site.
What is in a turnkey price?
Turnkey means one price from plans and approvals to a finished dwelling you can move into: kitchen, bathroom, flooring, paint and connections. Get the inclusions list in writing, because some builders leave site costs out.
Why is the estimate a range rather than one number?
Two blocks that look the same can price very differently once slope, soil class, trees, the length of the service runs and the finish level are counted. A firm quote needs someone to inspect the site.
Is my block suitable for a granny flat?
That turns on your zone, lot size and setbacks, and whether services can reach the site. Rules differ between states and councils, so check your title and the council's requirements before paying for plans.
Is GST in the estimate?
The figures are a guide, and residential builds are usually quoted plus GST. A written quote should say plainly whether GST is in the price.
How long from approval to move-in?
Building takes roughly 8-16 weeks on site after approval. Before that, design, engineering and council or private certifier approval take several weeks to a few months.
Want an exact figure for your Frankston granny flat?
Written quotes are free and carry no obligation.