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.

Connolly Pool House Build Perth

Based on The Gum - Built 2015.

A modern backyard with a Connolly flair features a small pool, two white lounge chairs, and a glass-walled pool house. Surrounded by trees and greenery under a clear blue sky, it's the ideal oasis.

There’s no better way to showcase Perth’s perfect weather than with this Hallmark Pool House Granny Flat design.


This beauty is based on The Gum from our Studio Design range and offers our clients a four-season area to enjoy their stunning pool and garden views, with all of the mod cons.


Opting for a BBQ Kitchen with sink and wine fridge, of course, I envisage lots of parties and gatherings for sure.


The bi-fold doors on two sides of the Studio allow the space to be opened up for that inside, outside connection us Aussie’s love.


Working with the existing footprint of the house and pool area, we managed to slip this Granny Flat into the space with stylish flair opening up the views and creating an overwhelming sense of space this area was previously lacking.


Cheers to this entertainer’s delight in Perth’s coastal corridor.

Modern white house in Connolly with large glass doors opening to reveal a living area and dining table, set against a green lawn. A stylish granny flat is nestled among the surrounding trees, offering both privacy and charm.
The serene outdoor patio of this modern Connolly home features two white lounge chairs, a small table with drinks, and a wicker basket. Open folding doors reveal stunning tree views, making it an ideal spot for guests or as a cozy granny flat retreat.
Modern open-plan dining area in this Connolly home features a wooden table and wicker chairs. Glass doors lead to a patio with outdoor seating and lush greenery views. A ceiling fan and pendant lights add charm, making it an inviting space even for a cozy granny flat setup.
This modern Connolly house features large glass doors surrounded by a wooden deck, lush greenery, and patio chairs under clear blue skies. A stylish granny flat adds versatility to the property, offering additional space and comfort.
A modern living room featuring Connolly dark leather sofas, a sleek glass coffee table, and open sliding doors that lead to a patio with outdoor seating and a lush lawn.
A modern backyard sunroom with glass walls and a wood deck serves as a charming granny flat. Equipped with patio chairs and a small garden, it's surrounded by trees and a fence under a clear blue sky.
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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''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