Granny Flats in Adelaide
A granny flat is a self-contained secondary dwelling on the same block as an existing house. Adelaide granny flats are hugely popular for teenager retreats, aged parents, home offices and rental income, but the rules on what you can and cannot rent out separately vary by council.
Best for
- •Older parents who want independence next door
- •Adult children saving for their first home
- •Home-based businesses and studios
- •Landlords adding a second rental income stream
Typical timeline
A typical Adelaide granny flat runs 6 to 10 months from design to handover, faster than a full home because most fit under the 60m² threshold that streamlines consent.
Council & overlay notes
Playford, Salisbury, Onkaparinga and Marion are granny-flat friendly with clear pathways. Burnside and Adelaide City can be tougher because of heritage and character zoning.
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Key decisions you'll face
Attached or detached
Detached granny flats give privacy and are easier to lease separately. Attached extensions cost less because they share a wall and services.
Can you legally rent it out?
Some councils allow separate leases, others treat granny flats as ancillary to the main dwelling. Get this in writing before you build.
Site drainage
A second roof on the same block doubles stormwater load. Councils will ask how you plan to handle it.
Where builds go wrong
Setback requirements
Most councils require the granny flat to sit a minimum distance from the boundary and the main dwelling. Under 60m² is often exempt from planning consent but still needs building consent.
Sewer connection cost
If the granny flat is more than a few metres from the existing sewer point, expect a five-figure connection cost that gets missed in early quotes.
How the process runs
- 1
Confirm your block can host one
Check setbacks, private open space and off-street parking under your council's development plan.
- 2
Decide attached vs detached
Detached gives privacy and rental flexibility. Attached saves money but limits future options.
- 3
Get quotes from granny-flat specialists
Not every builder is set up for small dwellings. Look for someone who has delivered granny flats in your council area.
- 4
Lodge for consent
Under 60m² usually needs only building consent. Larger builds need planning consent too.
- 5
Build, connect services, and move in
Construction on a slab-and-frame granny flat runs 3 to 5 months once site works start.
Common questions
How big can my granny flat be?▾
Under 60m² of habitable floor area is usually the cutoff for streamlined planning consent, though the exact rule varies by council. Larger granny flats need full development approval.
Can I rent my granny flat separately?▾
It depends on your council. Some allow separate tenancies, others only allow it to house family. Confirm with council in writing before you build.
Does it need its own driveway?▾
Not required in most cases but recommended if the granny flat is intended for a separate tenant. Off-street parking allocation matters at planning consent stage.
Will building a granny flat add to my rates?▾
Yes, adding habitable floor area typically increases your capital improved value and therefore your council rates. The uplift is usually modest.
Do I need a separate meter?▾
You can either sub-meter the granny flat under the main house account or install a separate connection. Separate is cleaner if you plan to rent it out.
Granny Flat guidance for a specific Adelaide suburb
Local overlays, character rules and site conditions all shift the plan. Pick your suburb for a per-suburb read.
Northern Adelaide
Southern Adelaide
Adelaide Hills
North-Eastern Adelaide
Fleurieu Peninsula
Also worth considering
Renovation & Extension
Renovating an existing house is often cheaper than knocking it down and starting over, especially when the bones are good and the location is prized.
Dual Occupancy
Dual occupancy is two dwellings on one title where the block is not subdivided.
Modular Home
Modular homes are built in a factory in sections, then trucked to site and craned into position.