Tradie Profile

Granny Flats Australia

4.8 (94 reviews)

Castle Hill, NSW

About this business

Granny Flats Australia designs and builds granny flats (mini homes) for investment, rental income or additional living space, managing everything from planning and council approvals through to construction. They differentiate themselves by offering tailored, full-service builds with luxury inclusions, customised floorplans, a display centre for walkthroughs and end-to-end project management.

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Service areas

Servicing Castle Hill and surrounding locations.

See what local homeowners are saying

  • TZTina Z15 Dec 2025

    Granny Flats Australia is exceptional! My site was very awkward and narrow to build on, but Granny Flats Australia did a phenomenal job to complete a beautiful 2-bedroom granny flat, just like a mini-...

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    Granny Flats Australia is exceptional! My site was very awkward and narrow to build on, but Granny Flats Australia did a phenomenal job to complete a beautiful 2-bedroom granny flat, just like a mini-home! I had granny flats built by different builders previously, but in my honest opinion, Granny Flats Australia is the BEST by far! Good value, knowledgeable, honour their promises, professionalism, streamlined process starting from day 1 until completion, and good quality workmanship. That's why I am now building another granny flat with Granny Flats Australia! Many thanks to Rod, Norman, Michael, Felicity, Liz, Martin, Dani, Chelsey!! You are all truly amazing!

  • JLJillian L4 Oct 2025

    For any Sydney siders considering building a granny flat, I would definitely recommend Granny Flats Australia. If you’re after a reputable and solution orientated company, want great customer service...

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    For any Sydney siders considering building a granny flat, I would definitely recommend Granny Flats Australia. If you’re after a reputable and solution orientated company, want great customer service and want a smooth construction process but also be involved with the customisation of your mini home, GFA is the company for you! The entire process from start to finish was seamless and reliable. I’m happy with the final outcome and enjoyed the experience with GFA. I’d like to say thank you to the team, Rod, Felicity, Norman, Michael and Danielle - the team are valuable assets to your company and really make GFA standout. Felicity supported with transforming my vision into reality, and I commend her and the architect/engineering teams for their agility and problem solving with making the limited space work (51sqm is the size of our granny flat). Norman was great during pre construction and during the external builds, he was thorough and kept me well informed about all the works to be done and was helpful with his recommendations. We were then handed over to Michael, who’s an absolute gun! He ensured works progressed timely and smoothly, communicated clearly and even offered to help if we noticed any defects after the keys were handed over. My only feedback would be to provide clearer explanations during the material selection process, especially when it comes to custom or add on materials. I originally selected a splash back panel that was an add on, however was notified during the last stages of the project that the company hadn’t worked with the supplier’s material before so they couldn’t guarantee warranty or final finish of the splash back. This is understandable, however I would have appreciated if this was communicated up front during the material selection meeting and to work through alternatives earlier on instead of deciding last minute on secondary options, which were done close to completion of the project. Thankfully we managed to land on splash back tiles that we were satisfied with, so thanks Felicity for working through this with me.

  • PKPAVANI K12 Aug 2024

    We had a fantastic experience with Granny Flats Australia while building our owner-occupied granny flat. From the beginning, Rod impressed us with his extensive knowledge and realistic approach to the...

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    We had a fantastic experience with Granny Flats Australia while building our owner-occupied granny flat. From the beginning, Rod impressed us with his extensive knowledge and realistic approach to the quote. As the project progressed, we had the pleasure of working with Liz, Martin, Norm, Michael, Chelsea, and Danielle. They consistently surprised us with their seamless teamwork, timely communication, and prompt responses to all our queries. The quality of the work exceeded our expectations, and we couldn’t be happier with the final result. Highly recommend!

  • VOvovantuoi14 May 2025

    My experience in building the flat with Granny Flat Australian was very pleasant and excellent. They delivered the result as specified in the contract in a professional and trustworthy manner. All sta...

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    My experience in building the flat with Granny Flat Australian was very pleasant and excellent. They delivered the result as specified in the contract in a professional and trustworthy manner. All staffs are friendly and helpful.The newly built flat is of high quality with beautiful design, and is great value for money. My big thank you and highly recommendation. Well done all staffs at Granny Flat Australian. Van Tuoi Vo ( Mt. Pritchard NSW 2170)

  • AMAdam M19 Nov 2023

    A big thank you to the Granny Flats Australia team. We are very happy that we chose them for our project. Some things that could have been done better: response time for questions about material selec...

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    A big thank you to the Granny Flats Australia team. We are very happy that we chose them for our project. Some things that could have been done better: response time for questions about material selections, knowledge about passive solar design, high performance windows and low VOC paints, setting expectations for when the project would begin and communication around the timeline of milestones. Some things that were awesome: initial meeting at showroom to discuss project, creation of initial quote, friendliness and responsiveness of reception staff, friendliness of all workmen and staff on site, cleanliness of site, responsiveness of external and internal construction managers, and the actual end product/workmanship. The team were also helpful with aspects of the job that were related to our project, but not their responsibility, such council contributions, tree removal and damage to our property caused by the skip bin operator. Some things that the pre-construction team could start doing: advise clients on passive solar design and high performing materials that promote a low energy footprint. If we ever decide to build another one, then I would absolutely consider using them again and will recommend them to our family and friends.

  • TKTony K10 Sept 2025

    I just wanted to thank the team for the wonderful experience they provided. Their effort and support truly went above and beyond. As with any build, unexpected challenges came up, but they were consis...

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    I just wanted to thank the team for the wonderful experience they provided. Their effort and support truly went above and beyond. As with any build, unexpected challenges came up, but they were consistently on top of everything and handled it all with professionalism. The architect was especially impressive, he modify the floor plan to suit exactly what I wanted. This company delivers a truly bespoke and high quality service, both in their workmanship and the products they use. The attention to detail reflects prestige and care at every step. A big thank you to Rod, Martin, Norman, Michael, and the rest of the team. I’ll definitely be recommending your company!

Frequently asked questions

How much do builders typically charge?
Builder costs vary widely depending on the job type and complexity. Minor repairs are generally much less than extensions, small builds or structural alterations that need foundations, framing or specialist input. Most quotes include a call‑out fee plus labour and materials, and the page shows live pricing to help you compare options.
Do builders charge call-out fees?
Call‑out fees are common and typically cover travel and an initial inspection or assessment. This fee is usually separate from hourly labour and materials, and after‑hours or weekend attendance often attracts higher rates. Ask whether a call‑out or minimum charge applies when requesting quotes.
Do builders need a licence in Australia?
Yes. Building work generally needs to be carried out by a licensed builder in every state and territory, and NSW builders are regulated by NSW Fair Trading. Builders should be able to provide their state builder/contractor licence number and show appropriate insurances and ABN/GST registration. In Victoria, domestic building insurance is required above a state threshold for certain contracts.
How do I get a quote from Granny Flats Australia?
Granny Flats Australia lists through their website on this profile, so you can contact them directly for pricing and availability. Share a short scope and photos to get a faster quote.
What areas does Granny Flats Australia service?
Granny Flats Australia services Castle Hill and surrounds. Contact them to confirm service areas.
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