Granny Flats Perth WA

Perth granny flats can differ from one another so it is easier to give an exact time frame once we have had an onsite inspection and consultation with you. These are crucial in a construction project because, through this, we are able to discuss any other necessary details needed for the construction of your granny flat project.

We offer quick construction times with top-quality services. Our team can build a typical granny flat in under 14 weeks. Bear in mind, that this timeframe doesn’t include the administration time required for the council to approve documentation and engineering for the granny flat build on your property.

The final cost of building a granny flat in Perth WA depends on the size of the design, the complexity of your block, site conditions, and the inclusions selected. 

1-bedroom designs start from $193,000. We provide a detailed, fixed price quote within 5 business days of your initial consultation, so you know exactly what you are committing to before you sign anything.

A $500 concept design fee applies, which is deducted from your build cost if you proceed.

Since April 2024, most granny flats in WA under 70m2 no longer require planning approval from your local council, provided the design complies with setback, height, and site coverage requirements under the Residential Design Codes (R-Codes). 

However, a building permit is always required regardless of planning exemptions. Prestige handles all building permit applications and compliance submissions as part of our service.

For a full breakdown, see our granny flat approval guide.

Under current R-Code exemptions, granny flats in WA can be built up to 70m2 without requiring planning approval.

Some local councils may allow up to 100m2 with approval. The 350m2 minimum lot size restriction was removed in April 2024, meaning smaller lots and strata properties may now qualify.

Always confirm the specific requirements for your council area before proceeding.

Yes. Since the April 2024 R-Code changes, granny flats in WA can be rented to anyone, not just family members. You can rent through a real estate agent on a standard residential tenancy agreement or manage the tenancy directly.

Some council areas may have additional conditions around separate metering or parking. With the current WA rental shortage, a well-built granny flat can generate solid ongoing income.

Our standard specification is comprehensive. Every granny flat includes steel frame construction, engineer designed concrete slab, COLORBOND roof, R4.0 ceiling insulation, R2.5 wall insulation, split system reverse cycle air conditioner, LED downlights, Euro 600mm kitchen appliances (oven, rangehood, electric hot plate), glass splashback, vinyl plank flooring throughout, block out roller blinds, 3-blade fan with light to bedrooms, hobless shower, and light/fan/heater combo to bathrooms.

A full specification sheet is available on request or you can see the complete list on this page above.

A site-built granny flat is constructed from the ground up on a concrete slab at your property by a registered builder. It is covered by full statutory warranties, home indemnity insurance, and a building permit.

A kit home or transportable unit is prefabricated off-site and either delivered as flat-pack components or installed as a completed unit. Prestige only builds site-built granny flats.

Site-built dwellings generally offer greater design flexibility, higher build quality, and more straightforward compliance with WA council requirements.

We recommend an onsite consultation before providing a final quote because every block is different. Soil conditions, site access, existing structures, and council-specific requirements all affect the final price.

After the visit, we provide drawings within 5 business days and a detailed quote shortly after. A $500 concept design fee applies to produce the final design and costing. This is deducted from your contract price if you proceed with the build.

Yes. Prestige Homes and Granny Flats services Rockingham, Mandurah, Bunbury, Baldivis, Thornlie, Armadale, Ferndale, Dawesville, and Fremantle, along with surrounding south-of-river Perth suburbs.

 If you are outside these areas, contact us and we will confirm whether we can help.

Every granny flat includes a 6-month builder's warranty that activates at PCI (practical completion inspection) key handover. This covers defects or items not noticed at the first inspection.

All fitted appliances carry their own manufacturer's warranty separately. Statutory structural warranties apply as required under WA building legislation. A lifetime structural guarantee is also included, conditions apply.

Yes, in most cases. One of the most significant changes introduced in April 2024 was the removal of the 350m2 minimum lot size requirement for granny flats in WA.

This means smaller residential lots and strata properties can now qualify for a granny flat build, provided the design meets setback, height, and site coverage requirements.

If you are unsure whether your block qualifies, our team can advise you during the initial onsite consultation at no cost.

Once a complete and compliant application is submitted, building permits for standard granny flat builds in Perth typically take around 10 business days to be issued. More complex applications, or those involving council planning approval, may take longer.

Prestige Homes manages the entire permit application process on your behalf and will give you a realistic timeline once your design and site details are confirmed.

Rental returns for a granny flat in Perth WA vary depending on the size, suburb, condition, and market at the time of listing.

As a general guide, well-presented 1-bedroom and 2-bedroom granny flats in Perth's southern suburbs are currently achieving strong weekly rents given the tight rental market across WA

For an accurate rental estimate in your specific suburb, we recommend speaking with a local property manager alongside your build consultation.

Yes. All designs in the Prestige range can be modified to suit your block dimensions, lifestyle needs, and personal preferences. Common customisation requests include adjusting room layouts, altering window positions, upgrading kitchen or bathroom fixtures, or changing cladding and roof colours. Any changes are scoped and priced during the design phase before you commit to a contract. Your $500 concept design fee covers this customisation process and is deducted from your build cost if you proceed.