House Extensions in Clapham

Transform your SW4 property with expert house extensions. Specialising in side returns, rear extensions, and wraparound builds across Clapham.

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Why Clapham Homeowners Choose Us

Add Value

Extensions can add 15-20% to your property value in SW4

Quick Build

Most extensions completed in 8-12 weeks

SW4 Specialists

Deep knowledge of Clapham planning requirements

FMB Accredited

Full insurance and quality guarantees

House Extension Options in Clapham

Side Return Extension

From £48,000

Perfect for terraced and semi-detached properties. Typically adds 15-20m² of space.

Ideal for kitchen extensions
Often permitted development
8-10 week build time

Single-Storey Rear

From £70,000

Extend into your garden. Creates open-plan living spaces with natural light.

Up to 6m depth (semi-detached)
Bi-fold or sliding doors
10-12 week build time

Wraparound Extension

From £90,000

Combines side and rear extensions for maximum space. Transforms ground floor living.

Adds 30-40m² typically
Open-plan kitchen-diner
12-14 week build time

Clapham Extension Expertise

Conservation Area Planning

Parts of Clapham are within conservation areas. We have extensive experience navigating additional planning requirements while achieving your design goals.

Victorian Property Specialists

Clapham's Victorian terraces require sensitive extension design. We blend modern additions seamlessly with period features and traditional materials.

Party Wall Expertise

With predominantly terraced housing, party wall agreements are essential. We manage the entire process professionally, protecting your interests and your neighbours'.

Local Knowledge

We understand Clapham's streets, parking restrictions, and delivery access. Our team coordinates all logistics efficiently to minimise disruption to you and your neighbours.

House Extension Costs in Clapham

Side Return Extension (15m²)£48,000 - £65,000

Single-Storey Rear (25m²)£70,000 - £90,000

Wraparound Extension (35m²)£90,000 - £130,000

Two-Storey Extension (50m²)£130,000 - £200,000

What's Included:

• All structural work and foundations
• Roofing, windows, and doors
• Plastering and basic decoration
• Electrics and heating first fix
• Building control and certifications

Note: Prices exclude kitchen fitting, flooring, and final decorations. VAT included at 20%.

Frequently Asked Questions

Many single-storey rear extensions in Clapham qualify for permitted development, meaning no planning permission is needed. However, properties in conservation areas around Clapham Common may require planning approval from Lambeth Council. We provide free planning assessments during your initial consultation.

House extension costs in Clapham range from £48,000 for a side return to £130,000+ for a wraparound extension. Single-storey rear extensions typically cost £70,000-£90,000. Prices include structural work, building regulations, and standard finishes.

A side return extension takes 8-10 weeks, single-storey rear extensions take 10-12 weeks, and wraparound extensions take 12-14 weeks. We provide detailed schedules before work begins and keep you updated via our client portal.

Yes, well-designed extensions typically add 15-20% to Clapham property values. With strong demand in SW4, quality extensions often return more than their cost, especially open-plan kitchen-diners.

Yes, if your Clapham property is terraced or semi-detached, you'll need party wall agreements with adjoining neighbours. We handle the entire process including surveyor appointments and neighbour notifications.