Logo with the words "Granny Flats" in cursive script above "BY HALLMARK" in uppercase letters with a gold line underneath.
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Logo with the words "Granny Flats" in cursive script above "BY HALLMARK" in uppercase letters with a gold line underneath.

Quinns Rocks Granny Flat

Modern white kitchen with island, stainless steel appliances, and wood-look flooring, featuring large windows overlooking a backyard pool.

Quinns Rocks

Completed 2025

We recently completed this custom-designed 1-bedroom, 1-bathroom Granny Flat in Quinns Rocks, Perth, featuring a modern kitchen, open-plan living, and a smart study nook overlooking the existing pool. With a separate laundry, large Master Bedroom and private entry, this fully self-contained residence offers both independence and comfort.

Designed to complement the main home, this Granny Flat highlights our expertise in Perth Granny Flat construction — balancing style, functionality, and privacy. Whether for family, guests, or as a rental opportunity, this project showcases how a professional Granny Flat builder can deliver spaces that are practical, stylish, and perfectly integrated with existing properties.

Modern white kitchen with island, stainless steel appliances, and wood-look flooring, featuring large windows overlooking a backyard pool.
Modern bathroom with a walk-in shower, glass partition, wall-mounted showerhead, large mirror cabinet, black vanity, and white walls.
Minimalist bedroom with a white bed, white walls, dark carpet, air conditioner, and large glass doors leading to an outdoor area.
Minimalist bedroom with a white bed, mirrored closet doors, carpeted floor, and wall-mounted air conditioner; hallway and door to outside visible in the background.
Modern single-story house with light tan brick walls, a black tiled roof, and a paved walkway leading to a bright entryway under a clear blue sky.
Small entryway with a wooden-framed glass door, a large wall mirror, and a built-in wooden bench with white shelving above. Light wood flooring and neutral walls.
Single-story house with a brown-tiled roof, double garage, white walls, and paved driveway under a clear blue sky.
Modern kitchen with white countertops, a gas stove, and a large island, featuring sliding glass doors opening to a backyard with a pool.
A laundry room with a stacked washer and dryer is visible through an open door, leading to a bright open-plan living area with large windows and wood flooring.
Cursive text reading "Opening Flair by Hallmark.

Granny Flats by Hallmark are Perth’s Best Granny Flat Builder. Based in Clarkson (Perth) and building Granny Flats Across Perth’s Northern Suburbs. Locally Owned and Operated by Mark Gethin

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View our other Granny Flat Projects...

''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

  
 
 
 
 
 
 
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 Drew & Tamara Coulthard profile picture 
 
 
 Drew & Tamara Coulthard 
 
28 July 2025
 
 
 Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google. 
We had a superb experience when Mark and his team built a custom designed garage and upstairs ancillary accommodation from our drafted plans.  The project was delivered quite quickly in a very tight access space with minimal disruption to our backyard.  Nothing was too much trouble as we changed a few things during the build.  The tradespeople were all lovely, trustworthy, quality and professional.  We would definitely look to Mark if we were to do a similar build again in the future.  Thank you team for a great experience and putting us at ease for what can be a very stressful exercise.
  
 
 
 
 
 
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 Elad Feldman profile picture 
 
 
 Elad Feldman 
 
28 July 2025
 
 
 Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google. 
+5
Hallmark did a great job building our granny flat. Mark was fantastic to deal with—honest, reliable, and made the whole process easy. The build was high quality and finished on time. Would happily recommend them to anyone!
  
 
 
 
 
 
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 belinda o profile picture 
 
 
 belinda o 
 
28 July 2025
 
 
 Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google. 
We couldn't be happier with the experience we had with Hallmark Developments for our home addition. From start to finish, their quality of work was outstanding, with every detail handled meticulously. Mark and his team were extremely professional, always keeping us informed and providing honest advice that made the process smooth and worry-free. They were also impressively prompt, completing the project on time without cutting corners. It's rare to find a company that combines such high-quality craftsmanship with transparency and efficiency. We highly recommend Hallmark Developments to anyone looking for a reliable and skilled builder!"
  
 
 
 
 
 
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 Fran profile picture 
 
 
 Fran 
 
26 June 2025
 
 
 Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google. 
Had Mark build a large custom granny flat, from start to finish was amazing. Nothing was an issue and easy to work with.
Highly recommend build to anyone thinking of putting an addition on their property Thank you mark wonderful job!
  
 
 
 
 
 
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 Murray Woodington profile picture 
 
 
 Murray Woodington 
 
2 April 2025
 
 
 Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google. 
Outstanding experience.  From 1st consultation to handover we've been more than impressed with the first class service and attention to detail delivered by Mark and the team.
We now have two amazing spaces to enjoy the wonderful West Oz lifestyle.
  
 
 
 
 
 
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 Lolly Evans profile picture 
 
 
 Lolly Evans 
 
2 October 2024
 
 
 Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google. 
A personalized, professional experience during these build works from Mark and his team. What we thought would be a nightmare at the back yard with noise, drilling, digging and more, turned out to be a fun experience with his team as we communicated, chatted, drank coffee or tea on the freezing days and just shared opinions about the growth of the works as they happened.

Mark and team were always open to suggestions and feedback as works progressed, and this made the entire experience smooth running, to deadline, with a super quality finish, exceeding our expectations.. Thanks Hallmark!. Well done- John and Lauretta.

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Modern house exterior with brick and white walls, large windows, and illuminated lights. A tiled porch leads to glass sliding doors.

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. 

Our Granny Flat Designs
Spacious bedroom with sloped ceiling, large window, and glass doors. Contains a bed, sofa, armchair, floor lamp, and a pendant light. Neutral tones and minimal decor.

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.

Our Finished Projects
Modern single-story house with large glass doors, flat roof, and exterior lighting. A small rectangular garden bed with shrubs is in the foreground, surrounded by a paved patio area.

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. 

Our Process