Do I need council approval for a granny flat in NSW?
The NSW rules for secondary dwellings, detached, attached or inside the house, cited to the clause, and a free check of your lot.
In NSW a granny flat always needs approval. In zones R1, R2, R3 and R4 on a lot of at least 450 m² it can be approved with a complying development certificate if it is no more than 60 m² (more where the council's LEP allows) and meets the Housing SEPP standards below; otherwise, and always in zone R5, it needs a development application. A heritage item, a heritage conservation area or Class 1 or 2 acid sulfate soils on the lot rules out the complying route.
The standards
Granny flats are not exempt development. These are the standards for the faster complying development route, from Housing SEPP Chapter 3 Part 1 (sections 49 to 57) and Schedule 1.
| Zones R1, R2, R3, R4 and R5, where a dwelling house is permitted; complying route in R1, R2, R3 and R4 only | Housing SEPP s 49, 50, 54(1)(a) |
| Complying route: lot of at least 450 m² | s 54(2)(c) |
| Inside the existing house, with no external change but an extra entrance: complying with no minimum lot size and no Schedule 1 standards; a heritage conservation area or acid sulfate soils do not rule it out, a heritage item on the land does | s 54(3) |
| Floor area no more than 60 m², or more where the LEP allows | s 52(2)(c), Sch 1 cl 4(1) |
| One principal dwelling and one secondary dwelling only; the lot cannot then be subdivided | Sch 1 cl 2(1)(a), s 51 |
| Street frontage at the building line at least 12 m (lots 450-900 m²), 15 m (900-1,500 m²) or 18 m (over 1,500 m²) | Sch 1 cl 2(1)(b) |
| Site coverage of all buildings no more than 50%, 40% or 30% for those lot sizes | Sch 1 cl 3 |
| House, granny flat and attached structures together no more than 330 m² (450-600 m² lots), 380 m² (600-900 m²) or 430 m² (over 900 m²) | Sch 1 cl 4(2) |
| No higher than 8.5 m | Sch 1 cl 6(1) |
| Side setback at least 0.9 m, 1.5 m or 2.5 m and rear setback at least 3 m, 5 m or 10 m (more for buildings over 3.8 m high), for lots of 450-900 m², 900-1,500 m² and over 1,500 m² | Sch 1 cl 9, 10 |
| No extra parking required | Sch 1 cl 2(3) |
| On bush fire prone land: Planning for Bush Fire Protection, road access within 200 m and a fire-fighting water supply | s 57 |
| Development application route: a detached granny flat on at least 450 m² is a non-discretionary standard, so the council cannot ask for more | s 53(2)(a) |
Land where the complying route is not available
| Complying route for one attached to or separate from the house not available on land listed in Codes SEPP cl 1.19(1), which includes heritage conservation areas, Class 1 or 2 acid sulfate soils, foreshore areas and coastal hazard land | Housing SEPP s 54(2)(b) |
| Nor where there is a heritage item, draft heritage item or State Heritage Register listing | Codes SEPP cl 1.17A(1)(d), 1.18(1)(c3) |
If it does not meet the standards
Where the complying route is not available, a granny flat needs a development application (DA) to the council, assessed against the LEP and the council's development control plan. Outside zones R1 to R5 the Housing SEPP rules do not apply and the council's LEP decides whether one is allowed.
Before you build: the soil test. A granny flat slab and footings is designed to the site's soil. The builder or engineer will need the site classification under AS 2870, which comes from how reactive the clay on the lot is.
Free AS 2870 site class calculator · Desktop geotechnical report for the address
Other projects
Rules current to the version in force from 23 October 2026: State Environmental Planning Policy (Exempt and Complying Development Codes) 2008 and State Environmental Planning Policy (Housing) 2021. Plain-English summaries; the legislation is the authority. The address check uses the NSW zoning, cadastre, heritage, bush fire prone land, acid sulfate soils and flood planning maps we hold, which can lag the council's. It is a guide, not a planning certificate or legal advice. Based on content from the New South Wales Legislation website at 12 November 2026. For the latest information on New South Wales Government legislation please go to https://www.legislation.nsw.gov.au. © State of New South Wales. Licensed under CC BY 4.0: https://creativecommons.org/licenses/by/4.0/
Common questions
Do I need council approval for a granny flat in NSW?
In NSW a granny flat always needs approval. In zones R1, R2, R3 and R4 on a lot of at least 450 m² it can be approved with a complying development certificate if it is no more than 60 m² (more where the council's LEP allows) and meets the Housing SEPP standards below; otherwise, and always in zone R5, it needs a development application. A heritage item, a heritage conservation area or Class 1 or 2 acid sulfate soils on the lot rules out the complying route.
What if it does not meet the standards?
Where the complying route is not available, a granny flat needs a development application (DA) to the council, assessed against the LEP and the council's development control plan. Outside zones R1 to R5 the Housing SEPP rules do not apply and the council's LEP decides whether one is allowed.
Where do these rules come from?
From the NSW Housing SEPP Chapter 3 Part 1 (sections 49 to 57) and Schedule 1. The rules are statewide, so they are the same in every council area, but the lot's zone, size and planning overlays change which ones apply.