House Extensions in London

Welcome to Fittra, your professional home extension company in London. As an NHBC-registered construction company with over a decade of experience, we’re the trusted choice for high-quality, compliant house extensions in London.


Here’s why Fittra is the perfect partner for your project:


  • We offer hassle-free consultations and economical packages to ensure affordability without compromising quality.


  • Our team of experts understand local regulations and codes. This guarantees your house extension is compliant, adding value and security to your London home.


  • Fittra has a team of builders, architects, engineers, consultants, and designers. Together, they help complete projects to the best standards.


Choose Fittra, and experience the power of a professional house extension in the heart of London.

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Our Process for House Extension in London

Step 1: Consultation & Proposal

At Fittra, we begin your London house extension journey with a free consultation and site meeting. Here, we understand your needs and draw up a 12 – 18-page proposal outlining the cost and timeline. 


As experienced extension builders in London, we guide you through the process step-by-step. This ensures your vision and our expertise align perfectly for the best outcome. 

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Step 2: Planning, Design & Payment

Post consultation, we dive into full architectural and structural design. Also, you’ll have a meeting with our project managers. These experts will offer legal advice and help with planning permission and development research. Doing this ensures we plan, develop and construct with building regulations.


With approval, we request a modest 5% deposit. Alongside this, you’ll also receive a list of trade goods at discounted prices. We guarantee complete transparency to make home extensions in London a hassle-free experience.

Step 3: Construction & Completion

The final phase brings your London house extension to life. During this stage, you’ll have 24/7 project management contact. This allows us to ensure transparency and quality construction as per approved plans.


Before completion, we’ll undergo final snagging protocols and provide you with product warranties. By providing such an honest and quality service, we’re one of the best house extension companies in London.

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Ready to Make Your Dreams A Reality?

House Extension Types

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Double Storey

A double-storey extension offers the advantage of creating extensive space vertically. Perfect for large families or property owners looking to add a large space. This extension type transforms your home without intruding on the garden area. Learn more about how a double-storey extension can be your perfect solution.

Wrap Around

Wrap Around

Combining the rear and side extensions, wrap-around extensions reconfigure your existing space. They offer a significant increase in living space and an improved connection to the garden. Explore how a wrap-around extension can redefine
your living area.

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The ideal way to extend your living space into your garden without affecting the aesthetics. Rear extensions are perfect for adding value to your home. Learn more about rear extensions and how they can improve your property. 

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Side Return

A side return extension offers a clever way to utilise the often-overlooked space at the side of Victorian and Edwardian terraced houses. Perfect for creating a large open-plan kitchen extension, discover more about the potential of a side return extension.

How Much Does A House Extension Cost In UK?

The pricing of a house extension in London is complex. There isn’t one price that fits all, as it depends on various aspects of the project. However, at Fittra, we aim to cater to a wide range of budgets, offering a spectrum of cost-effective packages.


Several factors influence the total cost:

  • The types of materials chosen for your project
  • Any necessary building permits and adherence to planning regulations
  • The inclusion of any special features in your house extension


The cost of extending your home is contingent upon various factors, including the location, size, and desired level of finish. Our average extension costs in London range between £2,000-3,500 per m2, leading to total project costs typically falling between £50,000 and £200,000.


Here are some average costs for different types of extensions:

  • Rear extensions: from £55,000
  • Side return extensions: from £60,000
  • Wrap-around extensions: from £90,000
  • Double-Storey extensions: from £100,000


For customised home additions, labour costs will play a significant role. However, we only use skilled builders and designers for your London house extension project. This ensures your extension is of the highest quality and tailored to your satisfaction.

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Making London House Extensions Simple

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With a decade of practice under our belts, Fittra is a trusted name for home extensions in London.

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Accreditations from reputable bodies like NFB, FMB, NHBC, TrustMark, and the Considerate Constructors Scheme back Fittra’s reputation as a top-tier London extension builder.

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Bespoke Projects

Catering to a diverse clientele, we invite you to view our projects, showcasing our proficiency in building extensions in London.

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Tailored Pricing

Fittra offers free consultations, requires only a 5% deposit, and provides trade discounts. Flexibility and affordability are at the heart of our company.

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With Fittra, all new products come with a comprehensive warranty, ensuring our customers always choose us as their home extension contractors.

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We are fully insured with £5M public and products liability insurance and £10M employer’s liability insurance, making us a safe choice for your London home extension.

Let's Get Your Project Started



Why Work With US

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at all stages

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with project manager

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liability insurance

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of works

Integrated, In-house Team Will Work On Your Project

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Benefits from our trade discounts
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£5M public & products liability
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10% only deposit payments
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Detailed cost breakdown

In the End You Will Get




Our Projects

Do you have questions?

Frequently Asked Questions

How much does a house extension cost in London?

The cost per square foot for a house extension in London varies depending on the project’s size and complexity. At Fittra, we strive to offer competitive prices without diminishing quality. Our home extension cost per m2 averages from £2,000-3,500. You must note, however, that prices can vary depending on materials, specialised features, etc.

Does an extension add value to a house in the UK?

Absolutely! A home extension in London can add upwards of 10 – 12 per cent to your property’s value. At Fittra, we have a decade of experience carrying out extension projects that meet our client’s needs. Whether you’re looking to create extra living space or improve the aesthetic appeal of your property, we’re here to help.

Are house extensions in London subject to planning permission?

Yes, most house extensions in London do require extension planning permission. However, some smaller projects may fall under ‘permitted development rights’. We oversee planning so your extension building project adheres to local regulations. This gives you peace of mind that your project is in professional hands.

How long does a house extension project in London typically take?

The timeline for a house extension project in London can vary, depending on the project’s size and complexity. At Fittra, we pride ourselves on efficient and quality project management. As experienced house extension contractors, we complete most extensions within a few months. However, a more specific timeframe can be provided once we understand the exact requirements of your project.

What types of house extensions are common in London?

In London, the most common types of house extensions include rear extensions, side return extensions, wrap-around extensions, and double-storey extensions. At Fittra, one of the leading extension companies in London, we offer all of these and more. We work closely with you to choose the best extension type to meet your needs and enhance your property’s value.

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Work time

Mon-Fr: 8.00 am – 5.00 pm
Sat: 8.00 am – 1.30 pm




Park Parade Gunnersbury Avenue, W3 9BD



02082 438568

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