House Extension Services In London: Add Space & Value To Your Home

Home extensions in London are a great way to create extra space and improve your living environment without the hassle of moving. 

Whether you need a larger kitchen, an extra bedroom, or simply more room for your family, our expert house extension builders in London can deliver high-quality solutions tailored to your needs.

Why Choose A House Extension Instead Of Moving?

Choosing a house extension instead of moving means avoiding the stress and costs of selling, buying, and relocating. With a carefully planned extension, you can stay in the home you love, enhance your lifestyle, and increase your property’s value at the same time.

Side House Extensions In London

Side extensions are popular in London, particularly in terraced or semi-detached houses with narrow alleyways or unused spaces. These extensions make use of underutilised areas to create more functional rooms.

Side Return Extensions For Terraced & Semi-Detached Homes

A side return extension involves extending into the narrow strip of land at the side of your property.

This is a common choice for terraced house extensions and semi-detached house extensions, as it opens up kitchens and dining rooms while adding more natural light.

Rear (Back) House Extensions

Rear extensions involve extending the back of your property into the garden. This type of extension is ideal for creating larger open-plan living areas, extended kitchens, or even new bedrooms.

Single And Double-Storey Extensions

• Single-storey extensions are excellent for expanding kitchens and living spaces.

• Double-storey extensions provide additional bedrooms or bathrooms upstairs, offering long-term value.

Front House Extensions

A front house extension involves adding extra space to the front of your home, which can help create more room while improving the appearance of your property. 

This type of extension is ideal for expanding a living room, creating a new bedroom, or adding a home office. 

However, you’ll likely need planning permission, especially in areas with strict building regulations, so it’s important to check with your local council. 

The design should blend well with your home’s style, and working with an architect can help achieve this. 

Keep in mind that the cost will depend on factors like the size, materials, and complexity of the project, and some properties may have space limitations, making a front extension difficult to achieve.

Factors That Affect House Extension Costs

Several factors can influence the overall cost of a house extension in London:

1. Size and Complexity: Larger or double-storey extensions are naturally more expensive.

2. Building Materials: Premium finishes, glass extensions, or bespoke designs increase costs.

3. Planning and Regulations: Extensions that require planning permission or structural work add to the budget.

4. Location: Accessibility and restrictions in central London can raise costs.

Understanding these factors helps you budget realistically for your project.

Are House Extensions Worth It?

Yes, a well-planned house extension is a valuable investment. It can increase your home’s value significantly while providing the space your family needs.

How Much Are House Extensions In The UK?

The cost of a house extension in the UK varies based on design and location. On average:

• Single-storey house extensions cost between £1,500 and £2,500 per m².

• Double-storey house extensions can range from £2,000 to £3,000 per m².

For more accurate pricing, many homeowners use a house extension cost calculator UK, but it’s always best to request a tailored quote.

Benefits Of A House Extension

A house extension offers far more than just extra square footage, it’s an investment in comfort, lifestyle, and property value. Some of the key benefits include:

• More Living Space: Create a bigger kitchen, a new home office, or a playroom for children.

• Added Property Value: A well-built extension can increase your home’s value by 15–25%.

• Lifestyle Improvement: Enjoy open-plan layouts, brighter rooms, and spaces designed around your needs.

• Future-Proofing: Whether you’re working from home or expanding your family, extensions adapt to life changes.

• Cost-Effective Alternative To Moving: Avoid stamp duty, estate agent fees, and moving costs.

For many London homeowners, a house extension is more affordable and practical than relocating, offering a long-term solution that blends seamlessly with your existing home.

Types Of House Extensions In London

There are several popular extension types to consider:

• Rear House Extension: Extends into the garden, ideal for kitchens and family rooms.

• Side House Extension / Side Return Extension: Makes use of narrow side alleys, common in terraced and semi-detached homes.

• Front House Extension: Expands the front of the house but usually requires planning permission.

• Double-Storey Extension: Maximises both ground and upper floor space, adding bedrooms and bathrooms.

• Terraced House Extension: Designed specifically for narrow London terraced homes.

• Semi-Detached House Extension: Creates symmetry while maximising shared-wall properties.

• Glass Extension On House: Modern and stylish, bringing in natural light.

• Garden Room Extension Attached To House: Versatile space for offices, gyms, or relaxation.

Each option varies in cost and feasibility. Our house extension builders guide you to the most practical solution for your property.

House Extension Planning Permission Guide

Before building an extension, it’s essential to understand whether you need planning approval.

• Permitted Development Rights: Many single-storey rear or side extensions can be built without planning permission, provided they meet height and size limits.

• Full Planning Permission: Required for double-storey, front-facing, or complex designs.

• Conservation Areas & Listed Buildings: Extensions in protected zones require special consent.

• House Extension Plans: We provide architectural drawings and handle applications to ensure compliance.

Our team makes the planning permission process straightforward, handling paperwork and approvals on your behalf.

House Extension Cost In London: What To Expect

London house extension costs vary by design, property type, and location. Typical ranges include:

• Single-storey extensions: £45,000 – £75,000

• Double-storey extensions: £60,000 – £100,000+

• Glass or premium extensions: Higher due to bespoke materials

Key cost factors include foundation work, plumbing, electrics, finishes, and location restrictions. While online house extension cost calculators can give a rough estimate, the most accurate way to know your budget is through a site visit and a tailored quote.

House Extensions Frequently Asked Questions

How long does a house extension take?

Single-storey builds usually take 10–16 weeks. Double-storey or complex designs may take longer, especially with planning permission involved.

Do I need planning permission for a house extension?

Many small rear or side extensions fall under permitted development, but larger or front-facing projects usually require approval.

What’s the difference between renovating and extending?

Renovation upgrades interiors without changing the property’s footprint, while extensions increase the physical size of the home.

Can you design and build extensions for terraced and semi-detached homes?

Yes, we specialise in terraced house extensions and semi-detached house extensions, ensuring practical layouts and compliance with local planning rules.

Ready To Extend Your Home?

At Chaboun Construction, we are experienced house extension builders in London with expertise in design, planning, and construction. 

Whether you want a rear, side, or modern glass extension, we’ll create a space that adds value and transforms your home.

Contact us today for a free consultation and no-obligation quote.