Extension builders in London

Name: Extension Builder
Brand: MyBuilder
SKU: extension-builder
Rating: 4.6 (19 reviews)

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Some of our top rated extension builders in London

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Plastering and painting services
Rating: 5 out of 5
Extension Builder in London
Small family business with years of experience in : *Plasterering@external house insulation, k render, silicone render, sand cement render, damp proof render, skiming. *painting and decorating *tiling /bathroom refurbishment All work will be carried with great quality finish in a tidy manner with best prices you can get on the market.
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Latest review:
Wow, what a service. Needed a room and a half done quickly, Ady responded immediately and gave me his quote and said he could do it straight away. He blew the other quotes out the water, 12 hours later he was at my door material the lot, no fuss just got on with it. Would highly recommend him to anybody looking foe an excellent plasterer. Thanks again Day.
LOLLI DESIGN
No reviews yet
Extension Builder in London
With years of hands-on experience in plastering, skimming, insulation, drywall installation, and general building works, we take pride in turning your vision into reality. We work closely with homeowners, architects, and design studios to ensure every project is completed on time, on budget, and to the highest standards
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B.C.R BUILDING CONTRACTORS LIMITED
No reviews yet
Extension Builder in London
Battersea Clapham Renovations are a home renovation company based in South West London. We specialise in high-quality residential refurbishments, extensions, and loft conversions. We offer end-to-end services—from design and planning to construction and finishing—tailored to each client’s needs. With a focus on craftsmanship, sustainability, and local expertise, we help homeowners transform their spaces efficiently, on time, and within budget.
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ALBRISE LTD
New on MyBuilder
Extension Builder in London
ALBRISE LTD - Carpentry & Construction Services ALBRISE LTD is a London based construction and property refurbishment company. We specialise in first and second fix carpentry, including timber framing, stud walls, doors, skirting boards, flooring and finishing work. Our additional services include house renovations, extensions, roofing, external wall insulation (EWI) and rendering, plumbing, electrical work, CCTV and network installations. We are committed to quality workmanship, attention to detail, safety and customer satisfaction, serving London and surrounding areas.
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Star building and construction ltd
Rating: 5 out of 5
Extension Builder in London
We have wide range of tradesmen available to carry out all different kind of jobs from Installing floors, building an extension, loft conversions, new builds and house renovations. We are dedicated to ensure that all our work meets the standards of our clients, hence why all our tradesmen are handpicked for each job. We thank you in advance for your consideration and welcome you to look through our portfolio. You
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Latest review:
New extension, kitchen, shower room, flooring, fiber glass roof, roof light, new electrics, plumbing, boiler installation, removal of chimney, rear patio, soakaway, painting and decorating Satnam has exceeded our expectations in carrying out the complete job to our satisfaction within the agreed time to a very high standard. We are extremely pleased with his work. Satnam helped us select good quality products from suppliers for much less cost than if we were to source them ourselves. He was honest, courteous, professional, flexible, open to changes and made suggestions to improve the overall look. He even passed on his builders' discounts to us. We highly recommend this ambitious young builder who has excelled in the trade. We wish Satnam and his team the very best.
Happy Building London Ltd
Rating: 5 out of 5
Extension Builder in London
Hello, We’re an architectural design and construction management company with a love of creative inspiration. We help turn dreams and visions into reality for people who aspire to live in exceptional contemporary spaces. Big ideas are our thing. Along with expertly costed build packages. Then there’s our end-to-end project management service, perfect for people who want to leave nothing to chance.
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Latest review:
Restoration & Refurbishment- 17 Jul 2016
Valter was very impressive on his initial visit with some exciting ideas for the house improvements and we had no hesitation in choosing Happy Building above the other two building firms who quoted. Having signed off on the budget and scope of work, Valter's team of builders arrived. We were hugely impressed with the skill, experience and work ethic of the team; the fact that they arrived early each morning smiling underlined the "Happy Building" epithet; Jarek, the site foreman, had an especially cheery demeanour. The work involved stripping the walls back to bricks, removing walls, reinforcing foundations, plastering, extending the bathroom and removing one bedroom to create a large ensuite bedroom. The latter certainly would not have been done without Valter's vision and patience in explaining how it would look. We were able to deviate from the original plans without any problem which was very important in achieving the final look which we had desired. Valter was very careful in sticking to time and budgets which I had never experienced before with builders. The kitchen, bathroom, two bedrooms, living room and hallways were finished to the highest possible specification within our budget. There were one or two small features which, with hindsight, we would have improved such as door handles and shower fittings, however this was down to us not specifying exactly what we wanted. These are very minor details and a tiny part of the overall picture.
Dansonsconstruction
New on MyBuilder
Extension Builder in London
Hello, my name is Daniel, I'm builden construction, specialist in: plaster, painting and decorator, I also work with tiles and foundations, construction in general, you don't have to look for someone else, I'm the builder you need, call me that you don't regret it!
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MR Homes & Properties LTD
No reviews yet
Extension Builder in London
Welcome to our company, where we pride ourselves on offering a complete range of construction services tailored to meet the needs of both residential and commercial clients. From minor repairs to building new structures, our expert team—backed by over 20 years of industry experience—ensures the highest standard of craftsmanship in every project we undertake. We specialise in a wide array of services, including loft conversions, home extensions, full refurbishments, and complete rebuilds. Our skilled professionals are adept in sandblast pointing, roofing, bricklaying, painting, and decorating. We also handle all aspects of plumbing and electrical work, laminate and wood flooring installation, and K -rend finishes. For your exterior needs, we offer comprehensive landscape work and rubbish removal services. Whether you're looking to enhance your home or improve your commercial property, our team is dedicated to bringing your vision to life with precision, quality, and efficiency.
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A.L.GRAHAM
No reviews yet
Extension Builder in London
I HAVE 47 YEARS BUILDING EXPERIANCE , PREFER JUST TO TAKE ON MEDUIM SIZE BRICKWORK JOBS NOW
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Surflex Ltd
No reviews yet
Extension Builder in London
At Surflex Ltd, we specialize in renovation, refurbishment, and complete construction services. From flooring, painting, wallpaper, and decoration to full property upgrades, we provide everything homeowners need to transform their spaces. Why Choose Us Complete service – One trusted team for every stage of renovation and finishing Skilled craftsmanship – High standards of quality and attention to detail in every project Reliable delivery – Projects completed on time, with minimal disruption to your home Tailored solutions – Designs and finishes that reflect your style and needs Why Clients Trust Us We are committed to professional standards, honest communication, and long-lasting quality. Most of our business comes from recommendations and repeat clients, proving the trust we build with every project. With Surflex Ltd, homeowners can be confident their property is in safe, expert hands.
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Bricklayer
No reviews yet
Extension Builder in London
Over 7 years experience, quality guaranteed
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Ava Constructions & Decors
Rating: 4.9 out of 5
Extension Builder in London
Ava Constructions & Decors Ltd is a UK-based construction and renovation company committed to delivering top-quality craftsmanship and reliable project management. We specialise in full refurbishments, extensions, bathroom and kitchen installations, and commercial fit-outs — always tailored to the client’s vision and delivered to the highest UK building standards. With a keen focus on transparency, timelines, and customer satisfaction, Ava Constructions has earned the trust of homeowners, investors, and developers alike. Punctuality and completion of work on time are a priority .Our team always respect the client wishes and work with them to achieve the best possible results to their satisfaction. Thank you in advance
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Latest review:
Extensions- 16 Apr 2026
I would not recommend this builder based on my experience. Instead of using crushed concrete they used soil to fill the house flooring for underfloor heating. 1 The project suffered from poor communication, repeated delays, and a lack of clarity around responsibilities. There were serious issues with the foundation works, which failed Building Control inspection and now require remedial engineering input before works can proceed. The site was also left incomplete and not in an acceptable condition. Despite substantial payments being made, key documentation, technical responses, and follow-through were lacking, leaving me to resolve major compliance and structural issues independently. My experience has resulted in delay, additional cost, and considerable stress. I would strongly advise others to ensure there is a detailed written contract, clear scope of works, and defined accountability
Eleven Construction Ltd
Rating: 5 out of 5
Extension Builder in London
ECON provide best quality building services to customer who are looking for high standard works for their residential properties up to their desired satisfaction. We are a professional building construction and maintenance company with highly skilled staff & workers of all trades to carry out the task given to our company.
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Latest review:
Builders and team work like professionals and completed everything in time. Highly recommended team of professionals.
True North Solutions
No reviews yet
Extension Builder in London
True North Solutions is a family-owned business with years of experience in home improvement and repairs. We specialise in bricklaying, offering high-quality work for everything from walls and patios to custom brick structures. At True North Solutions, we focus on providing reliable, long-lasting solutions tailored to each client’s needs. With a strong commitment to quality and attention to detail, we make sure every project is completed to the highest standard, adding lasting value to your home.
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Rightpath builders ltd
No reviews yet
Extension Builder in London
Rightpath builders specialise in loft conversions and over 16 years of experience on board we assure the quality you require.
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Uk property solutions (ups) ltd
No reviews yet
Extension Builder in London
Hello. I have been in the building industry for over thirty years. I’m a competent professional and cover all aspects of the industry. Please don’t hesitate to contact me for professional advise quotations ect.
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4.6

Top rated Extension Builders

Our Extension Builders in London, are rated 4.6 out of 5 based on 19 reviews from customers like you.

Quality screening

Easily find verified local tradespeople. Just post your job to get quotes from tradespeople near you across the UK.

What types of services are offered by local extension builders in London?

Building an extension is a major milestone for any home. It’s not just about adding extra space, it’s a big step that can transform how you live day to day, opening up new possibilities for comfort, lifestyle, and family needs.

This is why it’s so important to find the right extension builders in London for you. They can help with a variety of tasks and projects, including:

Extending your home with an extra room
Two+ storey extensions
Adding partition walls to create more rooms
Building annexes or external structures

To find the right extension builder near you, simply post your job on MyBuilder. Explain the type of help you’re looking for, and then home extension builders in London who are available and interested can respond to your post.

Browse profiles, read customer reviews and get quotes from your chosen London extension builders, all before you decide who to hire.

What are the hourly rates of extension builders in London?

Before getting started with your extension project, it’s important to have a clear budget in place. On average, extension builders in London will charge between £16 and £42 per hour.

Single-storey rear extensions cost between £20,000 and £60,000 depending on size and finish.
The cost of double-storey extensions, which add more space and value, can range from £100,000 to over £170,000.
Larger wrap-around extensions that combine multiple extension types can range from £40,000 to over £120,000.

The cost of an extension will vary depending on your property. For instance, extending in certain areas may require structural adjustments to ensure stability, which can increase your material and labour costs.

To get an accurate price for your home extension, request detailed quotes from several London extension builders near you on MyBuilder. This allows you to compare what each quote covers and how much your London home extension project is likely to cost.

Find extension builders in London with MyBuilder

Hiring the right extension builder in London with MyBuilder couldn’t be easier. Just follow these simple steps:

Step 1: Post your extension project on MyBuilder

Whether you’re planning a single-storey extension, a loft conversion, or adding a new room, post your job on MyBuilder to find local London extension builders. Once your job is live, we’ll share it with home extension builders in London who can express their interest.

Step 2: Compare different extension builders in London

When you start receiving interest, review profiles of local London extension builders, check their previous work, and read real customer reviews. Ask about timelines, materials, and request detailed quotes.

Step 3: Hire London extension builders with confidence

After gathering all the information and quotes from your chosen home extension builders in London, compare their experience, guarantees, and costs before choosing who to hire.

You’ll also have confidence knowing that every tradesperson on MyBuilder is verified through several checks, including:

ID verification: When a tradesperson joins MyBuilder, we ask for a valid ID, such as a passport, ID card, or eIDAS certificate.
Company verification: For tradespeople operating under a company, we make sure every tradesperson has a registered business.

Did you know? Our continuous monitoring and complaints process ensures that tradespeople who don’t meet our standards are promptly removed from MyBuilder’s platform.

London extension builders are ready to help. Use MyBuilder today to find the right professional for your home extension.

What to ask a London extension builder before hiring?

Before hiring an extension builder in London or extension building company in London, ask a few key questions to make sure you’re choosing the right professional for your home extension project.

What qualifications and experience do you have as an extension builder in London?

An extension builder in London should have a strong track record with similar projects and relevant building qualifications or trade memberships, such as the Federation of Master Builders (FMB) or TrustMark.

Will my home extension meet all building regulations and planning requirements?

Your London extension builder should ensure the project complies with Building Regulations and, where necessary, handle or assist with planning permissions. Ask how they manage building control inspections and what documentation you’ll receive once the project is complete.

What experience do you have with similar extensions in London?

Ask to see examples of their previous work, or view examples of their work on MyBuilder. Ideally projects similar to yours in scale and design. This helps you assess the London extension builder’s ability to deliver a result that meets your expectations.

How long will the extension take to complete?

Extension project timelines can vary depending on size, complexity, and weather. A typical single-storey extension might take around 8 - 12 weeks. Request a detailed schedule so you know what to expect and when key milestones will be reached.

Do you offer a guarantee for your work? Most London extension builders offer a guarantee or warranty on their work, often between 1 and 10 years depending on the project and materials used. This gives you assurance that any issues will be resolved after completion.

If you still have questions about the professional you are looking to hire, we have a full detailed guide on hiring the right builder here.

FAQ: Common questions about home extensions in London

Can an extension builder in London help with planning permission?

Yes, many extension builders in London can guide you through the planning process. They can help prepare drawings, advise on local requirements, and liaise with your local council to ensure your project meets all necessary regulations.

Can an extension builder in London handle everything from design to construction?

Many London extension builders offer full design-and-build services, managing both the architectural planning and construction stages. Ask your builder whether they can provide a complete package or if you’ll need to hire an architect or designer separately.

Will an extension builder in London help with materials and finishes?

Yes, most extension builders in London can source materials and offer advice on finishes that suit your design and budget. You can also choose to supply certain materials yourself, just make sure this is agreed upon before work starts.