Granny flats are a popular choice for families who want to keep their loved ones close, or for homeowners who want to generate extra income. But with so many builders out there, how do you choose the right one for your needs?

Keep reading to find out everything you need to know, including:

• What granny flat builders can do
• The most common issues
• The cost of hiring a granny flat builder
• How to hire a reputable local builder
• Benefits of granny flats
• Getting quotes from granny flat builders

What tasks can granny flat builders take care of?

Granny flat builders provide a comprehensive service, from design and planning to construction and handover. They will work with you to create a granny flat that meets your needs and budget, and obtain the necessary council approvals.

Once the design is approved, they will construct your granny flat to the highest standards, using quality materials and construction methods. They will also ensure that it complies with all relevant building codes and regulations.

Some of the specific tasks that builders can take care of, include:

• Site preparation
• Foundation work
• Framing
• Roofing
• Electrical work
• Plumbing work
• Insulation
• Drywall
• Flooring
• Painting
• Landscaping

In addition, some granny flat builders may offer:

• Appliance installation
• Furniture selection and placement
• Gardening and landscaping

Read more: Unique granny flat ideas

Most common granny flat issues

Although granny flats offer a number of advantages, there are some potential drawbacks to be aware of. 

One of the most common problems with building a granny flat is space. Granny flats are typically smaller than traditional homes, so it's important to make the most out of every square metre. This means carefully planning its layout and choosing the right furniture and fittings. 

Another common problem for granny flats is noise. As they’re often located close to the main house, it's important to choose materials and construction methods that will minimise noise pollution. This may include using soundproofing materials in the walls and ceilings, and installing double-glazed windows.

Other common problems with granny flats include:

• Issues with council approval which can be complex and time-consuming
• Susceptibility to mould and mildew

Cost of hiring a granny flat builder

Builders charge between $2,000 and $5,000 per square metre for a basic granny flat, depending on the size, complexity, materials, and location.

You can expect to pay between $120,000 and $140,000 for a one-bedroom granny flat of approximately 36 square metres, and between $145,000 and $155,000 for a two-bedroom granny flat of approximately 60 square metres.

Any quotes provided by a granny flat builder should include a cost breakdown for:

• Design and planning
• Site preparation
• Construction
• Connection to services
• Landscaping

You may also need to factor in the cost of council approval, which can vary depending on your location.

Read more: How much does a granny flat cost?

How to hire a reputable granny flat builder

If you are considering building a granny flat, it is important to choose a reputable and experienced builder. 

Ask these key questions to determine if they are a match for your project:

• How many years of experience do you have?
• What is your design process?
• What materials do you use to build granny flats?
• What is your construction process?
• What is your warranty policy?
• What are the most common challenges you face when building granny flats?
• How do you overcome these challenges?
• What are the latest trends in granny flat design?
• Do you have any experience building granny flats on my type of property?

Reputable builders should also be able to provide advice and guidance on a wide range of topics, so be sure to ask about:

• Choosing the right type of granny flat for your needs
• Selecting the right materials and finishes
• Budgeting for your granny flat project
• Obtaining council approval
• Maintaining your granny flat

Benefits of granny flats

Granny flats offer a variety of financial and personal benefits. They provide much-needed extra space for families, teenagers, young adults, elderly parents, or guests. They’re also versatile and can be used for a variety of purposes. For example, a granny flat could start as a home office, transform into a teenage retreat, and then later be used as a rental property. This makes them a good investment for people with a variety of needs, even if those needs change over time.

Granny flats can also add value to your property and save you money on energy bills. They are typically smaller than traditional homes, so they require less energy to heat and cool. Additionally, they can be designed to be energy-efficient, which can further reduce your energy costs.

Read more: Can I build an extension on a granny flat? and tenting out a granny flat

Getting quotes for granny flat builders

The best way to get quotes for granny flat builders is to contact multiple builders and request a quote. Be sure to provide the builders with as much information as possible about your project, such as the size and type of dwelling you want to build, the materials you want to use, and the desired finish.

It is also important to trust your gut feeling when choosing a builder. If you feel comfortable with a particular builder and you are confident that they can deliver on your expectations, then they are probably the right builder for you.

*Costs and prices in this article are indicative and should only be used as a guide. They also vary locally and are subject to market forces.