House Extension Cost

The cost of house extensions can vary greatly depending on a number of factors. These include the size and complexity of the extension, the build quality, the materials used and the location.

As a general guide, a simple house extension might cost anywhere from £10,000 to £30,000. A more complex extension could cost anything up to £100,000 or more.

There are a number of ways to keep costs down when extending your house. One is to use lower-cost materials such as timber frame construction. Another is to do some or all of the work yourself. This can be a great way to save money but it’s important to make sure you have the necessary skills and experience before embarking on a DIY project.

If you’re thinking of extending your house, it’s a good idea to get several quotes from different builders to compare costs. It’s also worth speaking to your local planning authority to find out if there are any restrictions on the size and type of extension you can have.

Factors that will affect the cost of your house extension

  • The size of the extension (in square metres)
  • The complexity of the project
  • The materials used
  • The location of your property
  • Whether you use traditional or modern construction methods

Everything You Need to Know About the Cost of House Extensions 

Adding a house extension is an exciting and practical way to add more space and value to your home. But before you dive into the process, it’s important to consider the cost of house extensions. The cost of a house extension is affected by many factors, such as size, complexity, materials used, location, and design. In this blog post, we’ll take a look at each of these factors so that you can get an idea of how much your dream house extension might cost. 

Size and Complexity 

The size and complexity of a project are two key factors that affect the cost of house extensions. Generally speaking, larger extensions will cost more than smaller ones because they require more labour and materials. Similarly, complex designs with intricate details will also increase project costs due to the extra labour required for installation. 

Materials Used

The materials used in a house extension project can also greatly affect its overall cost. Certain materials, such as wood or stone, may be more expensive than others, like brick or concrete, depending on where you live and what type of material you choose. Additionally, any special features like skylights or built-in cabinetry will also increase your total project costs.   


The location of your house extension can play a role in its overall cost as well. In some cases, local building codes may require certain types of construction or materials that could drive up expenses. Additionally, if there is an existing structure on the property that needs to be removed prior to construction, then this could add to the total cost as well. Finally, if there are any other restrictions or requirements imposed by local authorities, then this should be taken into account when budgeting for your project too. 


The final factor that affects the cost of a house extension is design. If you opt for a custom-designed solution, then this could add significantly to your project costs due to the extra time required for design work and planning approvals from local authorities (if necessary). On the other hand, if you choose an off-the-shelf solution, then this could reduce costs since these designs typically require less time and effort during installation than custom solutions do.

This is general information only and does not constitute financial advice. For more specific advice about house extension costs, please speak to a qualified professional.