If you are thinking of adding more space to your home, then you must go for a house extension. With this option, you can get a bigger kitchen and even an extra bedroom. You get more space without looking for a bigger home.
In this blog, we will explain everything you need to know about the house extensions UK cost. We will tell you about the different types of extensions. Plus, we will also talk about planning permission and price estimates. We want to keep things simple and useful for every property holder in this country.
Why Choose a House Extension?
Moving can be expensive and time-consuming. This is the reason why many people choose to extend their homes instead of moving. With a house extension, you stay in the place you love. This way, you make it work better for your needs. You also increase the value of your home. This can be a smart investment for the future.
What is a House Extension Cost in the UK?
This is one of the most common questions. The answer depends on many things, such as the size of the house. It also depends on the type of house and the location. The cost also depends on the materials used. On average, a single-storey extension may cost between £1,800 and £2,500 per square metre. A double-storey extension might cost £2,000 to £3,000 per square metre.
For example:
- A small 15m² extension might cost around £30,000–£37,000.
- A larger 30m² extension could cost £55,000–£70,000 or more.
If you are planning for 2025, keep in mind that material and labour prices may change. So, always check the cost of house extension UK 2025 from experts.
Types of House Extensions and Their Cost
There are many types of house extensions. Each one has a different purpose and cost. Let’s look at the most common options:
1. Rear Extension
This adds space to the back of your house. It is great for bigger kitchens and living areas.
Average cost: £30,000 to £50,000
2. Side Return Extension
This fills the unused space along the side of your home.
Average cost: £25,000 to £45,000
3. Wrap-Around Extension
This combines a rear and side extension. It gives you a large and open-plan space.
Average cost: £50,000 to £80,000
4. Double-Storey Extension
You get space on two floors. It is more cost-effective per square metre than a single storey.
Average cost: £60,000 to £100,000+
5. Garage Conversion
You change your garage into a room. This is cheaper than building a new space.
Average cost: £15,000 to £30,000
All these options help you understand the types of house extensions and their cost in the UK.
UK Home Extension Price Guide
We will give you a rough idea of what you can expect to pay:
| Type of Extension | Size | Estimated Cost Range |
| Single-Storey | 15–30m² | £30,000 – £70,000 |
| Double-Storey | 30–60m² | £60,000 – £120,000+ |
| Side Return | 10–20m² | £25,000 – £45,000 |
| Wrap-Around | 25–50m² | £50,000 – £80,000 |
| Garage Conversion | 10–20m² | £15,000 – £30,000 |
Always get detailed quotes from the best builders. Some builders offer fixed prices. There are others who charge based on time and materials. A clear budget plan helps avoid hidden costs later.
Planning Permission Cost UK Extension
Planning permission depends on what kind of extension you are building. Some projects fall under “permitted development,”. This means you don’t need full planning permission. But if your extension changes the structure and is near boundaries, you might need approval.
Here are some fees that may be charged:
- Planning application fee (England): £258
- Building regulations application: £300 to £750, depending on the project
- Architect or designer fees: 7% to 15% of the project cost
Check with your local council to confirm the planning permission cost UK extension in your area. It is always better to check first rather than face delays later.
Extra Costs to Consider
When calculating the total cost, remember to include:
- VAT (usually 20%)
- Architect and designer fees
- Surveys and structural reports
- Interior fittings (kitchen units, flooring, lighting)
- Waste removal
- Insurance and legal costs, if needed
These extras can add 15–20% to your total budget.
Ways to Keep Costs Under Control
- Set a clear budget before starting.
- Choose simple designs to reduce costs.
- Use cost-effective materials.
- Get multiple quotes from trusted builders.
- Plan for at least 10% as a backup in case of changes.
When Is the Best Time to Build?
Spring and summer are the right times for building work in the UK because of better weather. But this can also mean higher prices and less availability. If you plan early, you can book experts in advance. This helps in avoiding peak-season costs.
Conclusion
Planning a house extension is a big step, but it can be very rewarding. Some of you may want more room for your family. There may be some who want to add value to your home. Understanding the house extensions UK cost is the first step. You need to pick the right type of extension. You have to think of budgeting for permissions and extras. This UK home extension price guide can help you make better choices. Always take your time and get professional advice. Make sure you choose the right team. For more details, contact us at Weston Construction Ltd.
FAQs
1. Do I need an architect for a house extension?
It depends on your project. For complex designs, hiring an architect can help with plans. They can also help with permissions and smooth construction.
2. Can I stay in my house during the extension work?
Yes. But it may get noisy and dusty. If major work is involved, you might prefer to move out for a few weeks.
3. How long does a house extension take to complete?
Most single-storey extensions take around 10–14 weeks. Double-storey and complex projects may take 4–6 months.
4. Is it cheaper to convert a loft or build an extension?
Loft conversions are often cheaper than ground extensions. This is because they use existing space. But they may give less flexibility.
5. Will a house extension increase my council tax?
Possibly. If your property value increases after the extension, the Valuation Office Agency may reassess your council tax band.
