House Extensions in London – Expert Design & Build Services

If you’re looking for high-quality house extensions in London, we provide complete design and construction solutions tailored to your home. Whether you want to expand your kitchen, add a new living area, or maximise space with a double-storey extension, our experienced team manages every stage—from initial consultation to final handover.

We specialise in creating functional, modern, and value-boosting extensions that are fully compliant with UK building regulations and tailored to London properties.

Types of House Extensions We Offer

We deliver a wide range of bespoke extension solutions to suit different property types and budgets.

Rear Extensions

Rear extensions are one of the most popular ways to expand your home, ideal for creating open-plan kitchen and dining spaces. They maximise unused garden space and significantly improve natural light.

Side Return Extensions

Perfect for Victorian and terraced homes in London, side return extensions transform narrow, unused alleyways into functional living areas.

Wraparound Extensions

A combination of rear and side extensions, wraparound designs offer the most space and flexibility—ideal for large kitchen-diners or family rooms.

Double Storey Extensions

Double storey extensions allow you to expand both ground and first floors, adding bedrooms, bathrooms, or office space while increasing property value.

Kitchen Extensions

We design and build modern kitchen extensions that combine style, functionality, and seamless indoor-outdoor living.

How Much Does a House Extension Cost in London?

The cost of a house extension in London can vary depending on size, design, and complexity.

Typical Price Ranges:

• Small extension: £30,000 – £60,000

• Medium extension: £60,000 – £100,000

• Large / double-storey: £100,000 – £150,000+

Cost Per Square Metre:

• £1,800 – £3,500+ per m² depending on specification

Factors That Affect Cost:

• Size and layout

• Structural work required

• Quality of materials and finishes

• Planning and architectural fees

• Access to the property

We provide transparent quotes with no hidden costs, ensuring you can plan your project with confidence.

Planning Permission & Building Regulations

Not all extensions require planning permission. Many projects fall under permitted development rights, but this depends on the size and type of extension.

You may need planning permission if:

• The extension exceeds size limits

• Your property is in a conservation area

• You are making major structural changes

All extensions must comply with UK building regulations, covering:

• Structural safety

• Insulation and energy efficiency

• Fire safety

• Drainage and ventilation

We handle the entire process, including drawings, applications, and approvals.

Our House Extension Process

We follow a structured approach to ensure a smooth and stress-free experience.

1. Initial Consultation

We discuss your ideas, requirements, and budget.

2. Design & Planning

Our team will refer a few architectural agents to design and plan the extension discussing the requirements and budget.

3. Approval & Preparation

We ensure all permissions and regulations are in place before starting.

4. Construction

Our skilled builders complete the project efficiently with minimal disruption.

5. Completion & Handover

We deliver a high-quality finish and ensure everything meets your expectations.

Why Choose Us for House Extensions in London?

• Experienced local builders

• Fully managed design & build service

• Transparent pricing

• High-quality craftsmanship

• Compliance with all UK regulations

• Strong track record of successful projects

We understand London properties and how to maximise space while maintaining structural integrity and style.

Recent House Extension Projects

We have completed a wide range of extension projects across London, including:

• Modern rear kitchen extensions

• Side return transformations

• Large wraparound family spaces

• Double-storey home expansions

Other Services we offer to complement your extension project include:

Complete bathroom renovation services in London to complement your extension project

Complete facade restoration for older and heritage buildings

Frequently Asked Questions

How long does a house extension take?

Most extensions take between 8–16 weeks depending on size and complexity.

Do I need an architect?

For most extensions, architectural drawings are required. We provide this as part of our service.

Can I live in my home during the build?

In many cases, yes. We plan projects to minimise disruption.

What is the most cost-effective extension?

Rear extensions are typically the most affordable and provide excellent value.

Will an extension add value to my home?

Yes—well-designed extensions can significantly increase property value, especially in London.

Get a Free Quote for Your House Extension

Ready to transform your home? Contact us today for a free consultation and no-obligation quote. Our team will guide you through every step and help bring your vision to life.