The cost of a home extension in London varies significantly based on the type of extension, materials, location, and quality of finishes. Here’s a general overview:
1. Single-Storey Extensions
Basic Finish: £1,500 - £2,500 per square meter
Mid-Range Finish: £2,500 - £3,500 per square meter
High-End Finish: £3,500 - £4,500+ per square meter
Example: For a basic 20 square meter extension with a mid-range finish, you might expect to pay around £50,000 - £70,000.
2. Double-Storey Extensions
Adding a second storey generally increases costs by around 50-60% more than a single-storey extension.
Basic Finish: £2,000 - £3,000 per square meter
High-End Finish: £4,000 - £5,000+ per square meter
Example: For a double-storey extension of 20 square meters per floor (40 square meters total), costs might start from £80,000 - £120,000.
3. Kitchen or Side Return Extensions
Kitchen extensions typically have higher costs due to plumbing, gas, and electrical work.
Cost Range: £2,500 - £4,000 per square meter
Side return extensions (extending into the space along the side of a property) are often slightly less but can still reach £30,000 - £50,000.
4. Loft Conversions
Loft conversions can be a cost-effective way to add space, especially in London where space is at a premium.
Dormer Loft Conversion: £30,000 - £50,000
Mansard Loft Conversion: £45,000 - £70,000
Hip-to-Gable Conversion: £40,000 - £65,000
5. Basement Extensions
Basement conversions or dig-outs are among the most expensive types of extensions in London, as they often involve significant structural work and waterproofing.
Cost Range: £4,000 - £6,000+ per square meter
Example: A 20 square meter basement conversion can cost anywhere from £80,000 to £120,000 or more, depending on finishes and additional features.
Additional Costs
Planning Permissions and Surveys: £1,000 - £2,000
Architect and Design Fees: 5-15% of the total project cost
Building Regulations and Inspection Fees: £500 - £1,500
Party Wall Agreements (if required): £1,000 - £2,500
Total Estimate
For a typical London home extension, the total cost range can be anywhere from £50,000 for a basic single-storey addition to £150,000 or more for larger, more complex, or high-end extensions.
These figures can vary, so consulting with architects, contractors, and quantity surveyors is highly recommended to get an accurate quote based on your specific needs and location in London.
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Address: 1 Hawk Hill, Battlesbridge, Wickford SS11 7RJ
Contact Us: 01268 733555
At Bloomsbury Court Interiors, we’re not just providing kitchens, we’re helping you create a space where memories are made. Let us help you make your kitchen the heart of your home.
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