Yes, many Blackett properties may be suitable for a granny flat, especially the suburb’s established homes on larger residential blocks. Under the NSW Housing SEPP, a secondary dwelling can qualify for Complying Development on a lot of at least 450m², provided the property and design meet the required standards. The secondary dwelling is generally limited to 60m² of floor area. Blackett is within Blacktown City Council, and many residential streets contain R2 Low Density Residential land, where secondary dwellings are permitted. Local property records also show numerous established blocks around 550 to 650m², although lot sizes vary and should always be checked individually. Before choosing a design, it is also important to check flood, drainage and bushfire-prone land mapping, as these site constraints can affect the approval pathway and where a granny flat can be positioned.
Get inspiration from our recent granny flat projects across Blackett and surrounds — and see how we’ve turned different properties into practical new spaces.
Blackett has several characteristics that make a granny flat particularly practical for established homeowners. At the 2021 Census, 74.2% of Blackett households were family households, while 51.2% of occupied homes were rented, significantly higher than the NSW rental share of 32.6%. The suburb is also dominated by separate houses, which account for 89.1% of occupied dwellings, creating greater potential for suitable properties to make better use of existing backyard space. Blackett is close to the Mount Druitt town centre, Mount Druitt Hospital and Mount Druitt Station, which provides T1 and T5 train connections across Western Sydney. For homeowners planning ahead, a granny flat can provide independent accommodation for parents or adult children, while retaining the option to use the dwelling as a rental property as circumstances change.
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The three things that shape a granny flat build in Blackett: the planning rules, the ground you’re building on, and what the market gives back.
Median house price in Blackett
Typical granny flat rent
Key local landmark
your block
nearest station
A granny flat in Blackett can be approved through a private certifier as complying development when the lot is 450m2 or larger, the secondary dwelling is no more than 60m2 (or 25% of the main house, whichever is less), and setbacks, height and landscaping meet Housing SEPP 2021 standards. This pathway typically takes 10 to 15 business days once documentation is complete. Bushfire prone land does not rule out a CDC, but the design must meet the mapped Bushfire Attack Level, so the RFS map is the first thing we check. Blocks inside a flood planning area can still qualify, but floor levels and fill must meet the council's flood controls, which we check against the flood certificate before design.
Not meeting one complying development requirement does not rule a project out. Where a block in Blackett is under 450m2, sits in a heritage conservation area, or is affected by a flood or bushfire control, a development application can be lodged with Blacktown City Council. Assessment times are longer than a CDC, but the council does approve secondary dwellings through this route.
Blackett is administered by Blacktown City Council and assessed under the Blacktown LEP 2015. The whole suburb falls within the one council area. Granny Flats X confirms the consent authority for your specific block during the initial property assessment.
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The things Blackett homeowners ask us most. Can’t find yours? Call us — we’ll give you a straight answer.
Usually 12-14 weeks from approval. We fast-track the council paperwork.
Yes. Most Blackett blocks support 60m² 2-bedroom layouts.
Yes, but we handle the entire approval process for you.
