What is the Average Cost of a Granny Flat?

Granny flats have been growing in popularity over the past few years. Families are looking for ways to create more space, and granny flats provide an affordable option. If you're considering adding a granny flat to your property, you may be wondering what the average cost is. In this blog post, we will discuss the cost of granny flats.

Granny Flat Size and Prices

1 Bedroom

$150,000 – $200,000

2 Bedroom

$250,000 – $300,000

3 Bedroom

$300,000 – $350,000


$280,000 – $320,000

What is a Granny Flat?

A granny flat is a small, self-contained living unit that is attached to or located on the same property as a single-family home. Granny flats can be used for a variety of purposes, including providing extra space for relatives or guests, generating rental income, or accommodating aging parents or adult children.

What Does it Cost to Build a Granny Flat?

The cost of building a granny flat will vary depending on a number of factors, including the size of the unit, the materials used, the location, and any special features or amenities that are included. In general, you can expect to pay between $150,000 and $200,000 to build a basic granny flat. If you want a more luxurious unit with upscale finishes and features, the cost could be closer to $320,000. It all depends on the granny flat designs you choose and the level of finish you select.

Custom Built Granny Flats vs Kits vs Flat Packs

There are three main options for granny flats: custom-built units, kits, and flat packs. Custom-built units are the most expensive option, but they offer the greatest flexibility in terms of design and finishes. Kits are pre-fabricated units that come with everything you need to assemble the unit on your property. Flat packs are similar to kits, but they do not include all of the necessary materials, so you will need to purchase some additional items to complete the assembly.

What Are The Inclusions?

When you're considering the cost of a granny flat, it's important to think about what is included in the price. For example, a kit or flat pack may not include all of the necessary materials, so you will need to factor in the cost of these items. Additionally, custom-built units will typically include some type of warranty or guarantee. Be sure to ask about what is included in the price so that you can accurately compare your options.

Other Costs to Consider

In addition to the cost of the granny flat itself, there are a few other costs to consider. First, you will need to pay for site preparation, which may include leveling the ground and bringing in utilities. Additionally, you will need to obtain any necessary permits or approvals from your local council. These costs can range from a few hundred dollars to a few thousand dollars, depending on the complexity of the project.

Do I Need Council Approval to Build a Granny Flat?

In most cases, you will need to obtain council approval to build a granny flat. The approval process can be complex and time-consuming, so it's important to factor in these costs when you're budgeting for your project.

Will a Granny Flat Increase the Value of My Home?

Adding a granny flat to your property can increase the value of your home, but it's important to keep in mind that this value will vary depending on the location of your property and the current market conditions. In general, granny flats tend to be most valuable in areas where there is high demand for housing.

Building a granny flat is a significant investment, but it can be a great way to provide extra space for your family or generate rental income. When you're considering the cost of a granny flat, be sure to factor in the cost of materials, site preparation, permits, and council approval. Additionally, keep in mind that the value of your granny flat will vary depending on the location of your property and the current market conditions.


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