Granny Flat Builders Perth
Hallmark is the leading builder of premium quality, Custom Granny Flats in the Northern-Perth region.
Granny Flat designs you’ll love...
We have something for everyone.
Select a design from our 'Granny Flats by Hallmark' range or have our Designer work with you to design something custom to suit your individual needs.
Check out our designs, download our design brochure of reach out if you're looking for something more specific.
The Hallmark Difference...
Granny Flats by Hallmark is a family-owned and operated building company that has proudly served Perth and surrounding areas for over 25 years.
You may be familiar with our sister company, Hallmark Developments, known for delivering quality craftsmanship and reliable service.
We specialise in premium custom granny flats designed to suit your lifestyle, with a focus on quality and affordability.
Led by local Perth builder Mark Gethin, our team brings hands-on experience, personalised support, and a commitment to making the building process straightforward and stress-free.
Take a look at our range of thoughtfully designed granny flats, made to suit Perth families, investors, and homeowners alike. We specialise in Custom Designed Granny Flats so every design can be personalised to your liking.
See the real results we've delivered across Perth. From sleek finishes to clever use of space, our completed builds show the quality and care that goes into every granny flat we construct. Let these transformations inspire your own backyard project.
There’s a lot that goes into building a granny flat but you don’t need to worry about that. We handle the big stuff like council approvals, design, and construction so you can focus on the exciting part! Here's what to expect when building a granny flat with us.
''Perth’s Best Granny Flat Builder''
Here at Granny Flats by Hallmark we are so thankful for the wonderful people we get to work with on a daily basis. Our reviews speak for themselves with our clients always speaking highly of us and the job we have done for them
Ready to Get Started?
Perth’s Favourite Granny Flat Builder Blog...
Granny Flat Financing Options: How Homeowners in Perth Are Funding Their Builds
How Homeowners in Perth Are Financing Their Granny Flats Building a granny flat in Perth is a fantastic way to add extra space and potential rental...
Attached vs. Detached Granny Flats: Which One Should You Build in Perth?
Should You Build an Attached or Detached Granny Flat? More Perth homeowners are investing in granny flats to create extra space, increase property...
Can You Turn a Garage Into a Granny Flat in Perth?
Thinking About Turning Your Garage Into a Granny Flat? Here’s What You Need to Know If you have an underused garage, you might be wondering if it...