Short answer: In Western Australia a home or granny flat can be designed by a building designer who is not separately registered, so one team can take your project from design through engineering and the building permit pack. EcoPrestige’s Domestic One Stop package does this for a fixed $16,200 incl GST when the module supply is under $800,000, all inclusive, starting with $4,000 + GST.
Who can design a granny flat in Perth?
WA does not run a registration scheme for building designers of houses. The State’s Building and Energy reform program is reviewing how designers are regulated, so check the current position before you sign anything. What does not change is the approval step: a building permit is issued by your local government, and a certified application needs a certificate of design compliance from a registered building surveyor.
What the One Stop package covers
- Site review and concept layout for your block
- Design and documentation for the modules
- Structural engineering for the steel frame and footings
- Energy report
- Soil test and land survey (sites up to 700 m2)
- The building permit pack prepared to your surveyor’s checklist
- Coordination with your local council on planning questions
As the manufacturer, EcoPrestige is responsible for every module: built and inspected in an offsite factory to Australian engineering and QA, then delivered to site.
Do I need planning approval as well?
Often you do not, but it depends on your lot, zoning and the Residential Design Codes that apply to ancillary dwellings. Your council confirms whether development approval is needed. We check this at the start, before design money is spent.
How long does it take?
Your design is delivered within 10 business days of receiving your site details. Council, surveyor and certifier timing is outside our control and we plan around it.
What does it cost?
The One Stop package is $16,200 incl GST for supply under $800,000, all inclusive, starting with $4,000 + GST. Module supply is priced to your design. Freight is quoted to your site. See the modular home prices page and the design to delivery process.
Related guides
- What building class is my modular building?
- Modular construction in Perth
- Granny flat design and permit in Adelaide
Terms, approvals and building laws vary from state to state. We confirm what applies to your site before you commit.
Frequently asked questions
Can a building designer draw my granny flat in Perth?
Yes. WA does not separately register building designers for houses. A registered building surveyor still issues the certificate of design compliance for a certified application.
Who issues the building permit in WA?
Your local government issues the building permit. A certified application includes a certificate of design compliance from a registered building surveyor.
How much is the One Stop package in Perth?
$16,200 incl GST for module supply under $800,000, all inclusive, starting with $4,000 + GST. Supply is priced to your design.
Is the design fee credited against the modules?
No. The One Stop fee covers design, engineering and the permit pack. Module supply is priced separately.
Do I need development approval for a granny flat in Perth?
It depends on your lot, zoning and the Residential Design Codes. Your council confirms it, and we check it before design starts.
*Rules vary by state. Design and building work is carried out by the licensed or registered practitioner your state requires.