General requirements for a suitable block to build a granny flat are:

  • Maximum floor area 60m2
  • Blocks 450m2 or greater
  • Land zoned residential
  • 3m rear set back from property boundary (for blocks 900m2 & under)

No! The government is encouraging the construction of granny flats in most areas via ‘Complying Development Applications’.

Under Complying Development, approvals can be obtained as quickly as 10 working days (if your property meets the criteria for Complying Development).

If your property is not suitable for Complying Development then a Development Application can be lodged with your local council.

In most cases yes. However it’s best to purchase an up-to-date Section 149 (versions 2 & 5) Planning Certificate from your local council. This will confirm whether or not there are any specific restrictions on your block that may prevent you building a granny flat.

P J Cook Building can also happily arrange for a Section 149 (versions 2 & 5) on your behalf for a fee of only $133


Simply call P J Cook Building on 0406 299 318 to arrange a time and we will meet you onsite to examine your block suitability & complete a site measure of your chosen design


Our design team can customise one of our standard designs to suit your own personal requirements and budget.

Alternatively, you can choose from our large range of standard 2 bedroom designs. We have over [21] 2 bedroom designs so you are destined to find a suitable design that works for you, your budget & your backyard

All of our granny flats are mini versions of new homes & are built onsite. We do not build kit homes

Once work commences onsite, the construction process normally takes 12 weeks for a granny flat build [Conditions apply]


Refer to your BC4 contract for specific details on these inclusions


Providing the laneway to your property is at least 3m wide and the dimensions of your lot (excluding the area for the laneway) is at least 12m x 12m

If your block & granny flat design meet the relevant criteria outlined in the SEPP then a private certifier can approve the plans on behalf of Council within just 10 working days of lodgement

The maximum size is 60 square metres – excluding carports, patio, alfresco areas, etc.


Most granny flats and homes are built on a slab on ground. However if your block is in a flood affected area or your land contours are slopey, we may suggest to build on piers.  This decision is dependent on your site conditions


Brick veneer is an additional cost. If you elect to use brick veneer, the interior floor space is reduced by 3-4 square meters as the overall area is measured from outside of building to outside of building


The P J Cook Building team handle the entire process from design to handover

Ideally yes.

We recommended you send us the following documents so that we can confidently provide you with the correct information & design ideas.

  • An up-to-date Section 149 planning certificate [versions 2 & 5] or the full copy of purchase of sale & any other relevant information
  • Contour survey to AHD level
  • Any council existing sewer diagrams or any other relevant information

Once contracts are signed, our experienced team commence work onsite within 6-8 weeks (for all projects with complying development [CDC] approvals)

Yes. We have a large range of external 3D facades & materials to choose from.

All appliances come with manufacturer 24 month warranty.

Bathroom & laundry items come with a Reece Plumbing manufacture 12 month warranty.

HWS comes with a Reece Plumbing manufacture 10 year warranty.

There is a 6 year structural warranty following our maintenance period which is 13 weeks/upon practical completion.