How Much Does a House Extension Cost in London?

One of the most common questions homeowners ask is: How much does a house extension cost in London?
The answer depends on several factors, including size, design, materials, and the complexity of the build.

Average Cost of a House Extension in London

In London, house extension costs typically range between £1,800 to £3,000 per square metre. A standard rear extension may cost between £40,000 to £80,000, while larger or double-storey extensions can exceed £100,000.

Factors That Affect Extension Costs

• Size and layout of the extension
• Structural work such as steel beams
• Finishing level (standard vs luxury)
• Planning permission & building control
• Access to the property

Is a House Extension Worth It?

A professionally built extension can increase your property value by 15–25%, making it one of the best home investments in London.

At Homes Construction & Renovations, we provide transparent pricing, expert advice, and fully managed house extension services across London.

📞 Contact us today for a free site visit and detailed quotation.

07344784162