Building a House Extension in London

Building a house extension in London can not only transform your home, but also enhance its functionality and value.

There are many reasons for needing an extension. There are just as many varieties of costs associated with the build, the materials used, the various rooms you can extend, and the different types of extensions available in our vibrant and diverse city!

It can be a lot to navigate, but we can help you with this entire process. With decades of experience – and hundreds of 5 star TrustPilot reviews under our belts – you’re in safe hands.

You can also read our essential guide to extensions here.

See Some Examples of Our Extension Projects

Understand The Different types of Extensions in London

Rear Extensions

Steel beams may be required to support the structure, especially in large or multi-story extensions. Steel is strong and can allow for open-plan living spaces with minimal structural support.

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Side Extensions

Side extensions are built along the side of the house, typically extending into a driveway or garden area. They can be used to expand living areas or create additional bedrooms.

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Wraparound Extensions

Wraparound extensions combine rear and side extensions to maximise space and create a cohesive, open living area.

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Loft Conversions

While not technically extensions, loft conversions are a common way to add extra rooms and space to London properties. They involve converting the attic into usable living areas, such as bedrooms, offices, or playrooms.

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Basement Extensions

In central London, where space is at a premium, basement extensions are popular. These involve excavating below ground to create additional living space, such as bedrooms, gyms, or home theatres.

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Conservatories and Orangeries

These glass extensions are primarily used for creating light-filled spaces that connect to the garden. They are often used for dining rooms, lounges, or cosy reading nooks.

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ser extension type conservatories and orangeries

Moving House Is Expensive in London: Why An Extension Is A Better Option

You need more space

In London, one of the main reasons homeowners consider an extension is simply the need for more living space. Many properties in the city have limited square footage, and as families grow or lifestyles change, the need for extra room becomes clear. A house extension adds valuable space without the need to move, helping you make the most of your home.

Extensions can include anything from an extra bedroom or utility room, to a rear kitchen or additional living space. As London specialists, we focus on making the build process straightforward and stress-free, ensuring every project runs smoothly from start to finish. London residential architecture is incredibly diverse – but we haven’t met a project we couldn’t handle yet.

You need more space

Increase property value

A home extension in London can make a real difference to how your space works and feels. In a busy property market, using your space well can also make your home significantly more appealing if you ever decide to move.

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It’s expensive to move house

Relocating in London can be costly and stressful. Between stamp duty, estate agent fees, and hiring movers, the expenses quickly add up. Extending your current home gives you extra space without all the disruption, letting you stay put while making your home work harder for you.

Expensive to relocate

Customise your space

House extensions give you the chance to shape your home around your needs. Whether it’s extra bedrooms, a bigger kitchen, a home office, or another type of space, you can create rooms that fit your lifestyle and how you want to live.

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Materials associated with the build

Glass

Glass

Glass extensions, often in the form of conservatories or orangeries, are an elegant way to bring natural light and a sense of the outdoors into your home. They are particularly popular for kitchen and dining room extensions.

Wood

Timber

Timber frame extensions are known for their versatility and eco-friendliness. They can be clad in a variety of materials, including wood, render, or brick, to achieve your desired look.

Brick

Brick

Brick is a traditional and popular choice for extensions in London. It offers a timeless aesthetic, durability, and excellent insulation properties. You can select from various brick styles and colours to match your existing property.

Steel

Steel

Steel beams may be required to support the structure, especially in large or multi-story extensions. Steel is strong and can allow for open-plan living spaces with minimal structural support.

How much does a house extension cost?

The cost of a London extension can vary depending on factors like location, size, design, materials, and labour. On average, a standard extension is around £2,500–£3,500 per square metre, with single-story extensions generally costing less than two-story ones. Costs can be higher in central London and more affluent areas. The good news is that there are ways to spread the cost, such as finance options, to make it more manageable.Building a house extension in London can be a smart investment, giving you extra space, adding value to your property, and allowing you to shape your home around your needs. The overall cost and approach will always depend on the type of extension, materials, and your individual circumstances.

A successful project comes down to having the right team in place, from architects and builders to designers, fitters, and project managers who understand your priorities. Choosing experienced, trusted and highly rated professionals helps keep the process smooth and the end result exactly as you imagined.

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What’s inside?

  • Loft Conversions & Extensions – Styles, benefits & design options
  • Step-by-Step Process – From consultation to completion
  • Transparent Pricing – Understand costs upfront
  • Finance Options – Flexible solutions to suit your budget

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