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Granny Flat & Secondary Dwelling Design Sydney

Granny flats and secondary dwellings designed for clarity, compliance and repeatability across sites.

Secondary dwellings, including granny flats, designed for clarity, compliance and repeatability across sites. Layouts respond efficiently to NSW planning controls, site constraints and approval pathways, with documentation prepared for smooth assessment and construction.

The focus is on proportion, functionality, resolution and cost precision.

Well suited to homeowners, investors and builders delivering single or multiple granny flat projects.

Secondary Dwellings · LCG Architects Sydney

Granny flat rules in NSW, in plain terms

In NSW a secondary dwelling can often be approved as complying development under the Housing SEPP, which means a private certifier rather than a council DA. The usual conditions are a lot of at least 450 square metres, a dwelling of up to 60 square metres of floor area, and compliance with the setback, height, landscaping and privacy standards in the SEPP. Where a site does not meet those standards, a DA to council is still available and we design for that pathway instead.

We check your block against the controls before the design starts, so you know early which pathway applies and what it means for size, position and programme.

Designing a granny flat that works

A good secondary dwelling is about proportion and placement: a layout that lives well at 60 square metres, a position on the block that keeps privacy for both homes, and a connection to services that is practical to build. We resolve orientation, stormwater, access and the relationship to the main house, then document the dwelling so the builder of your choice can price it accurately.

For investors and builders running several granny flat projects, we set up a repeatable drawing standard so each site is documented to the same quality without starting from scratch.

Where we design

Secondary Dwellings across Sydney

We design and document secondary dwellings projects from our Lindfield studio for homeowners, investors and builders across these areas, each resolved to its council's own planning controls.

Our other services

Siting a granny flat around existing services

Where the sewer, stormwater and other services run decides where a granny flat can sit on the block. Locating those services and surveying the site before design avoids a redesign later, and both are done within the LCG group.

FAQ

Frequently asked questions

Can my granny flat be approved without a DA?

Often, yes. If the block is 450 square metres or more and the design meets the Housing SEPP standards, a private certifier can approve it as complying development, which is usually faster than a council DA. We confirm which pathway your site qualifies for before design begins.

How big can a granny flat be in NSW?

Under the Housing SEPP a secondary dwelling is limited to 60 square metres of floor area for complying development. Councils may allow a different size under their own LEP through a DA, and we advise on that where it applies.

Can a granny flat be detached or attached?

Either. It can be a detached building in the yard, an attached extension, or a conversion of part of the existing house, provided the controls on setbacks, height and private open space are met.

Do you handle the certifier and the approval?

We prepare the full documentation set and coordinate the consultants the approval needs, such as a survey, BASIX and engineering, and liaise with the certifier or council through assessment. Construction is by the builder of your choice.

How long does it take to get a granny flat approved?

Complying development can be approved within weeks of a complete submission; a council DA typically takes longer. The biggest factor is a complete and coordinated set of drawings, which is what we focus on.

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Ready to get moving?

Send through your site details and a note on what you are planning. We will come back with the right pathway and next steps.

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