Thinking About Building a Granny Flat? Here’s What to Expect
Thinking about building a granny flat in Perth but unsure where to start? Whether you’re adding extra living space for family, creating a rental investment, or looking for a custom-designed granny flat, understanding the step-by-step process is key.
At Granny Flats by Hallmark, we specialise in high-quality, custom-built granny flats in Perth. Our team manages everything from council approvals to construction, ensuring a seamless and stress-free experience. Here’s what you can expect when working with us.
Step 1: Planning and Design
Before construction begins, you’ll need to plan and design your granny flat based on your needs and budget.
Key considerations:
- Purpose – Will it be used for family, guests, or as a rental property?
- Size & layout – Perth regulations allow granny flats up to 70m², but the best layout depends on your land and requirements.
- Attached or detached? – Some homeowners prefer a standalone granny flat, while others choose an extension to their existing home.
Building with Granny Flats by Hallmark
When you build with Granny Flats by Hallmark, we work closely with you to create a custom design that suits your block, lifestyle, and budget. We offer a range of granny flat designs in Perth, ensuring you find the perfect fit.
Need inspiration? Explore our granny flat designs in Perth here.
Step 2: Approvals and Permits
Do you need council approval to build a granny flat in Perth?
Yes, granny flats require approval under Western Australia’s building regulations. You’ll need to submit plans to your local council for approval before construction can begin.
What’s required?
- Development application (if applicable) – Depending on your local council’s zoning and planning rules.
- Building permit – Required to ensure your granny flat meets safety and structural standards.
- Service connections – Approval for water, sewerage, and electricity connections.
Building with Granny Flats by Hallmark
We handle the entire approval process for you, working with your local council to ensure your granny flat is fully compliant with Perth regulations. Our team will submit the required applications, liaise with authorities, and keep you updated every step of the way.
Getting council approval can seem complex, but working with Granny Flats by Hallmark ensures everything is handled correctly.
Step 3: Site Preparation & Foundation Work
Once approvals are in place, the construction process begins.
What to expect during site preparation?
- Clearing and levelling the site to ensure a stable foundation.
- Soil testing to check if the ground is suitable for building.
- Laying plumbing and electrical connections before the slab is poured.
Building with Granny Flats by Hallmark
Our experienced team manages the entire site preparation process, ensuring that everything is set up correctly before construction begins. If your block requires levelling or additional work, we’ll discuss the options with you upfront, so there are no surprises.
Step 4: Granny Flat Construction
With the site prepared, the actual building process begins.
Construction timeline:
- Frame construction – Timber framing goes up first
- Roofing – Protects the structure from weather.
- Internal fit-out – Walls, flooring, and ceilings installed.
- Plumbing and electrical work – All internal services connected.
- Final finishes – Painting, cabinetry, and fixtures installed.
Building with Granny Flats by Hallmark
We ensure your granny flat is built on time and within budget, using quality materials and skilled tradespeople. Throughout the build, we’ll keep you updated on progress and ensure everything meets our high construction standards.
Step 5: Final Inspections and Handover
Before moving in, we do a final check to make sure everything is ready to call your new granny flat home.
What happens during this stage?
- Builder’s final quality check – Ensuring finishes are complete.
- Handover – The keys are handed over, and your new granny flat is ready to use!
Building with Granny Flats by Hallmark
We manage all approvals so that your granny flat is ready for immediate use. Our team will also conduct a detailed quality check before handover to ensure everything is finished to the highest standard.
How Much Does It Cost to Build a Granny Flat in Perth?
- Basic granny flats: Start from $120,000
- Mid-range granny flats: Typically $150,000–$180,000
- Premium custom granny flats: $200,000+
- Factors that affect cost:
- Size & layout – Larger designs cost more.
- Site preparation – Uneven or sloped land may increase costs.
- Upgrades & materials – Higher-end finishes add value but cost more.
For a personalised quote, speak with an experienced granny flat builder in Perth to discuss your budget and requirements. At Granny Flats by Hallmark we would love the opportunity to give you a quote for your granny flat build.
Final Thoughts
Building a granny flat in Perth is a straightforward process when you work with an experienced builder who can manage design, approvals, and construction from start to finish.
Building with GrannyFlats by Hallmark
At GrannyFlats by Hallmark, we take care of everything from council approvals to the final handover, so you can enjoy a stress-free building experience.
Thinking about building a granny flat? Contact Granny Flats by Hallmark, your local Perth Granny Flat Builder
