🏡 Converting a Double Garage into a Granny Flat: A Smart Way to Add Value and Space

Convert Garage to Granny Flat

Are you looking to add extra living space to your property without the cost of building from scratch? Converting a double garage into a self-contained granny flat is a popular and practical solution. Whether it’s for elderly parents, teenage children, a rental opportunity, or even a private home office or studio—this cost-effective transformation can unlock incredible potential right in your backyard.

✅ Why Convert a Double Garage into a Granny Flat?

A double garage offers a solid structure, typically around 35–45m², which is an ideal base size for a compact, functional dwelling. By repurposing the space, you can:

• Maximize your property’s footprint

• Increase rental income potential

• Accommodate multigenerational living

• Create a private space for guests or remote work

• Add resale value to your property

Garage Conversion

🧱 What’s Involved in the Conversion?

Converting a garage into a livable granny flat involves more than a simple makeover. Here's what typically needs to be done:

1. Design & Approval

You’ll need a well-thought-out floor plan that complies with your local council’s regulations. Most councils treat garage conversions as change of use, so you’ll likely need:

• Planning approval

• Building approval

• Engineering and energy compliance reports

2. Insulation & Waterproofing

Garages aren’t usually built for year-round comfort. Walls, floors, and ceilings will need proper insulation and possibly waterproofing, especially if converting to a bathroom or kitchen.

3. Plumbing & Electrical

You’ll need professional trades to run plumbing for kitchens and bathrooms, as well as new electrical circuits for lighting, heating/cooling, and appliances.

4. Windows & Doors

Standard garages often lack sufficient natural light and ventilation. You’ll likely need to replace the garage door with a large window or sliding doors and add windows where needed.

5. Interior Fit-Out

Fit out the interior with:

• Bathroom and kitchenette

• Bedroom/living zone

• Flooring, lighting, and paint

• Storage solutions

🏗️ Sample Layout Ideas

• Studio Design: Open-plan with bed, kitchenette, lounge, and compact bathroom

• 1 Bedroom Layout: Separate bedroom, open living/kitchen space, and full-size bathroom

• Office + Guest Suite: Private office with a pull-out bed and bathroom

💰 What Does It Cost?

Garage conversions are typically more affordable than building a new granny flat from the ground up. Depending on location, finishes, and design, you can expect costs to start from $12,000–$100,000+, which is often far less than a new build.

⚖️ Things to Consider

• Zoning and Council Regulations

• Access and Privacy for the flat

• Parking Requirements (especially if removing a garage from a property)

• Stormwater and drainage needs

• Bushfire/Flood/Heritage overlays (if applicable)

📐 Need Help Getting Started?

We offer affordable concept plans and custom design services for converting garages into granny flats—tailored to your block, budget, and needs. Our designs are ready to submit for approval or can be adapted to suit.

👉 Contact us today to discuss your garage conversion and see how easy it can be to turn underused space into smart living.