Custom Designed Granny Flats Perth


We are a leading builder of premium quality, affordable Granny Flats in Perth WA.

We work with our clients to design bespoke Granny Flats that meet your individual needs.

With over 25 years experience we are able to work closely with you to overcome any challenges and produce a high quality result.

View our Past Projects here.

Granny Flat Designs

We design Granny Flat Floor Plans which are optimized for residential properties in Perth.

Every site is unique and so are our plans.

  • Open Plan Designs.
  • Brick or timber frame
  • Builders Reg No 13838
  • Specifications to suit your budget

Our Process

Here at Hallmark Developments, we take care of everything from;

  • Building Code Compliance
  • Quick Approval Process
  • Custom Designs
  • High Quality Finishes

Enquire for your complimentary consultation.

Looking at other ideas for your home or considering building?

Please take a look at our Home Building website

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Get In Touch With Us


4/49 Boranup Ave Clarkson WA 6030

Postal Address:
PO Box 2693,
Clarkson, WA 6030