House Extension Costs 2025

How much does a house extension cost in 2025?

Tel: 07754 271410

Are you considering adding more living space to your home with a house extension in 2025? Understanding the costs involved is crucial for proper budgeting and planning.

House Extension Cost per Square Meter 2025

The cost of a house extension in 2025 is typically calculated per square meter of new internal space. According to industry experts, the average cost per square meter in 2025 ranges from £2,000 to £3,500 (excluding VAT). This means that a 30m² kitchen extension could cost anywhere between £60,000 and £105,000, plus 20% VAT.

House Extension Cost: What You Need to Know in 2025

Wondering about house extension costs in 2025? House extension costs vary widely. The average house extension price depends on several factors. Single-storey house extension costs differ from double-storey house extensions. Your typical house extension cost might include:

House extension cost per m2 can range from £2,000 to £3,500.

Small house extension cost might start at £20,000, while a large house extension cost could exceed £100,000. Most House extension costs in the UK average around £40,000-£60,000

What is involved when pricing an extension?

Factors Affecting Extension Costs

While the average cost per square meter provides a general estimate, several factors can significantly impact the overall cost of your house extension:

Type of Extension: The type of extension you choose will affect the cost. Single-storey extensions are generally less expensive than double-storey or wrap-around extensions.
Quality of Finish: The quality of materials and finishes you select can greatly influence the cost per square meter. Basic finishes may cost £1,000 – £1,700/m², while high-end finishes can range from £1,900 – £2,200/m² for a single-storey extension.
Location: Extension costs can vary depending on your location, with higher prices typically found in areas like London and the surrounding regions.
Complexity of Design: Intricate designs, unique shapes, or challenging site conditions can increase the overall cost of your extension project.

Additional Costs to Consider

Beyond the construction costs, there are several additional expenses to factor into your budget:

Architectural and design fees
Planning permission and building regulation fees
Structural engineering costs
Site preparation and groundworks
Utility connections (e.g., plumbing, electrical)
Landscaping and exterior work

Cost Calculation Example

To illustrate the potential costs, let’s consider a 25m² single-storey extension with good quality finishes in an average location:

Construction cost: 25m² x £1,800/m² (average for good quality) = £45,000
Architectural fees: Approximately £3,000 – £5,000
Planning and building regulation fees: Approximately £1,000 – £2,000
Additional costs (e.g., groundworks, utilities): Approximately £5,000 – £10,000

Total estimated cost: £54,000 – £62,000 (excluding VAT)

Keep in mind that these are rough estimates, and actual costs may vary based on your specific project requirements and location.

Costs Guidline for Budget Extensions to Premium Extensions

Here’s a bullet point list of house extension costs for different sizes, as well as budget and premium extension prices:

20m² extension:
- Budget: £30,000 – £40,000
- Average: £40,000 – £50,000
- Premium: £50,000 – £60,000
30m² extension:
- Budget: £45,000 – £60,000
- Average: £60,000 – £75,000
- Premium: £75,000 – £90,000
40m² extension:
- Budget: £60,000 – £80,000
- Average: £80,000 – £100,000
- Premium: £100,000 – £120,000
Budget extension costs (per m²):
- £1,500 – £2,000 per m²
Premium extension costs (per m²):
- £2,500 – £3,000+ per m²

Please note that these are rough estimates, and actual costs can vary significantly based on factors such as location, design complexity, materials used, and the specific requirements of your project.

Contact us about your Home Extension Project

Whether you’re looking for a 30m2 extension in Hampshire, or a Wrap-around extension in Surrey, or an extensive house conversion in London, our team is dedicated to bringing your vision to life. Get in touch with us today, and let’s embark on a journey of creating spaces that reflect your style and stand the test of time. Your dream home project starts with a simple click or a call – reach out to us so we can guide you the right way.

07754 271410

Office / Service Area

Hampshire | Surrey | London UK

email

office@homebuildextensions.co.uk

Phone

07754 271410

Extending your home to fit your future

Get in touch with us at Home Build Extensions, to discuss your house extension project and guide you through the best way to gain the most from your new open space extension, or an extra bedroom for your new born.