Home builders in Thornlie
City of Gosnells · Gosnells Local Planning Scheme No. 24 · Perth South East Knockdown rebuild
- Council
- City of Gosnells
- Planning scheme
- Gosnells Local Planning Scheme No. 24
- Residential zones mapped
- Residential
- Bushfire-prone land
- Mapped in this suburb
- Urban growth area
- Yes
- R-Code density
- R20 to R100
Planning data from Landgate SLIP (CC BY 4.0), read 2026-09-14. Suburb-level, not a report on your block — check your address on the WA planning scheme maps.
Builders serving Thornlie
None yet — tell us what you're building and we'll go and find one.
What building in Thornlie actually involves
Thornlie is coded R20 to R100 — the highest R-code mapped anywhere on this site — inside a single Residential zone across 11.59 km².
R100 is apartment density, in a suburban postcode
The R-code is dwellings per hectare, so R100 assumes a hundred. R20, at the other end of the same suburb, assumes twenty. That is a fivefold spread, and it is the whole story of Thornlie: one zone, one scheme, and a density answer that changes completely from street to street. A design drawn for an R20 block will not meet the setback, open space and overlooking assumptions R100 land is planned around, and the reverse is equally true.
One zone makes the code the only variable
Residential is the only residential zone mapped. That is unusual and it is useful: the question is never which zone, only which code. Get the code on the title and most of the planning picture follows.
Centres and mixed use alongside
District centre, Local centre and Mixed use land are mapped within the suburb. None is residential, and each changes what can be built next door.
Bushfire
Part of Thornlie is inside a designated Bush Fire Prone Area, so an affected block needs a Bushfire Attack Level assessment.
What to ask a builder
Ask for the R-code on the lot before anything else — here it is the single fact that decides the project. Ask whether the design in front of you was drawn for that code.
Local landmarks in Thornlie
- Haven Park
- Barson Park
- Empire Park
- Baseball Park
- Claridge Park
- Teakwood Park
Named plans that apply in Thornlie
Structure plans covering land here, as the authority names them. Which one governs your lot decides its density, layout and staging — check the address before you assume the zone alone sets the rules.
- Forest Lakes District Centre Precinct Structure Plan
Endorsed by the Western Australian Planning Commission. The plan that covers your lot sets its density, lot layout and staging.
Source: catalogue.data.wa.gov.au/dataset/local-planning-schemes, read 2026-09-14.
Questions about building in Thornlie
What R-codes apply in Thornlie?
R20 to R100 — the highest code mapped anywhere on this site. R100 assumes a hundred dwellings per hectare and R20 assumes twenty, a fivefold spread within one suburb.
What zone is Thornlie?
Residential, and only that. The question here is never which zone but which R-code, which makes the code on the title the single most important fact.
Can I use a standard project home design?
Check the code first. A plan drawn for an R20 block will not meet the setback, open space and overlooking assumptions that R100 land is planned around.
Is there commercial land in Thornlie?
Yes — District centre, Local centre and Mixed use land are all mapped in the suburb. None is residential, and each changes what can be built next door.
Is Thornlie bushfire prone?
Part of it is inside a designated Bush Fire Prone Area, so an affected block needs a Bushfire Attack Level assessment.