Extension Builders in Clapham

Name: Extension Builder
Brand: MyBuilder
SKU: extension-builder
Rating: 4.1 (17 reviews)

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Some of our top rated extension builders in Clapham

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London project contractors ltd
Rating: 5 out of 5
Extension Builder in Clapham
Welcome to London Project Contractors LTD – Your Trusted Home Transformation Experts At London Project Contractors LTD, we specialise in bringing your property dreams to life. Whether you're looking to expand your space, upgrade your interiors, or improve your home's energy efficiency, we've got you covered. Our core services include: House Extensions – Seamlessly add space and value to your home. Loft Conversions – Turn unused lofts into stylish, functional living areas. Bathroom Fittings – High-quality installations designed for comfort and elegance. Insulation Services – Energy-saving solutions to keep your home warm and efficient. Property Conversions – Expertly transforming spaces to suit your lifestyle. With years of experience and a commitment to quality craftsmanship, we ensure every project is delivered on time, on budget, and to the highest standard. Let us help you build better – get in touch today for a free consultation!
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Latest review:
We recently had a loft extension completed along with wooden flooring throughout the house, underfloor heating installation, and a full silicone render — and we couldn’t be happier with the results! The team were an absolute pleasure to work with from start to finish. Their innovative and creative thinking really set them apart — they found smart solutions to challenges and helped us maximise space and style in ways we hadn’t even considered. What impressed us most was their attention to detail and how clean and tidy they kept the site throughout the project. It made a huge difference knowing the work was being done to such a high standard, without the usual mess and disruption. Whether it was a small detail or a big task, nothing was ever too much trouble. No job was too big or small — they approached everything with the same level of care and professionalism. If you’re looking for a reliable, forward-thinking team who take real pride in their work, I couldn’t recommend them more highly!
R G Property Maintenance
Rating: 4 out of 5
Extension Builder in Clapham
My name is Richard I have been in the building trade for over 20 years doing Extensions loft conversions carpentry kitchen fitting and bathroom fitting. I am reliable taking pride in the work that I carry out.
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Latest review:
Carpentry- 8 Jul 2020
Richard completed an excellent job at our school, reliable, efficient and has loads of knowledge.
Tim's Painting
Rating: 4.9 out of 5
Extension Builder in Clapham
Hi! My name is Tim.I have been working in the building trade for a very long time which has helped me a lot to gain lots of experience in different trades. We are based in Sutton but work allover the place in Surrey area. Quality of our job has helped our company to expand our business.
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Latest review:
Painting & Decorating- 18 Jun 2026
Tim is a superstar. Did an excellent job with painting and decorating and good communication throughout. Flexibility with the job timing and scope. Will use again and highly recommended.
Fornes Limited
Rating: 5 out of 5
Extension Builder in Clapham
No matter what size your requirements are, we provide a complete project management and a full turnkey service from simple kitchen or bathroom make up to more complex projects and skilled finishes like Mediterranean style. No hidden costs and all jobs guaranteed. We speak English and Spanish.
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Latest review:
I've used Facundo's team to install a new shower, including wall and floor tiling, massage jets, and concealed shower equipment. Facundo was the person we dealt with at all times, although someone else was assigned to do the job. The quality of the work and finish is extremely good. I was also impressed with Facundo's professional attitude at all times, being very polite and respectful, as well as proactive in addressing any potential issues affecting our planning and execution. Highly recommended.
We Fix Your House Ltd
Rating: 5 out of 5
Extension Builder in Clapham
We Fix Your House is a family-run, small team of experienced industry specialists with many happy clients in and around London. We take pride in our work and ensure that our customers are always happy. So whether you're are looking for a little DIY help, or a complete renovation of your property, we're happy to help. You'll be pleasantly surprised by our competitive prices too, and YES, we can work around your budget.
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Latest review:
Plastering- 28 Apr 2019
Great job, very professional
Inside Out
Rating: 4.9 out of 5
Extension Builder in Clapham
Inside Out was formed in 2009. We are an established, London based building company operating throughout London and within the M25. We deliver an honest and straight forward service, with quality workmanship at the forefront of everything we do.
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Latest review:
Extensions- 10 Oct 2022
A good team, good building technicians, completed the job according to plan and delivered on time.
Flanagan Construction
Rating: 5 out of 5
Extension Builder in Clapham
With over 30 years experience in the Construction trade we have come across nearly ever type of project in Construction including; loft conversion, extension, new builds, conversion works and renovations of old houses.
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Latest review:
Bricklaying- 4 May 2018
Mr. Flanagan did the job really good
Made Construction Simple Ltd
Rating: 3 out of 5
Extension Builder in Clapham
At Made Construction Simple we value the high-quality craftsmanship and impeccable service we provide for each and every one of our customers. With a wide range of construction services available, our team of experts are always on hand to provide property perfection
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Latest review:
Attended property, went to church thinking he'd start, returned to empty house no work done. let me down. bad service
SGB Water Engineering
Rating: 5 out of 5
Extension Builder in Clapham
SGB maintain an interactive IT process, to ease transparency and movement of information data, to all parties involved in any one project. We have a combined 25 years professional experience in the civil engineering / construction management. We are experts in water utilities management enabling us to offer a variety of services and solutions in this area.
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Latest review:
Plumbing- 9 Dec 2020
Work completed and problem has been resolved .
Ictinus Contractors
Rating: 4.9 out of 5
Extension Builder in Clapham
Ictinus Contractors is a reliable London-based building and renovation team, delivering high-quality workmanship across residential and selected commercial projects. We specialise in painting and decorating, wallpapering, plastering and skimming, hard flooring installation, bathroom fitting, and general property improvements. We take pride in providing clean, well-organised work with strong attention to detail from start to finish. Whether the job is a single-room refresh, a bathroom upgrade, new flooring, or wider renovation work, our focus is always the same: quality finishes, honest communication, and dependable service. Based in East London, we cover surrounding areas across London and work closely with every client to make sure each project is completed to a high standard, on time, and with care.
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Latest review:
Painting & Decorating- 6 Apr 2026
I had a very positive experience working with Konstantinos. He is personable, reliable, professional and excellent at co-operating throughout the process. He repainted my entire flat/walls/ceilings to a high standard (and sanded down) he also helped address a few additional repairs along the way. The finish is clean, fresh, and has completely transformed the space. He was thorough and ensured everything was completed properly and on time. I particularly appreciated his attention to detail and his proactive approach in taking care of things I hadn’t even noticed. I would happily recommend Konstantinos and would work with him again in the future! Thank you
Safeway Build Ltd
Rating: 5 out of 5
Extension Builder in Clapham
At Safeway Build Ltd, we pride ourselves on delivering exceptional craftsmanship and reliable service in every project we undertake. Led by Florin, a highly trained professional with over 20 years of experience in the construction industry and a proud member of the Federation of Master Builders (FMB) since 2014, our company is built on trust, quality, and attention to detail. Working alongside trusted electricians and plumbers, we offer a complete service that ensures every aspect of your project is handled with care and expertise. Much of our success has come from referrals and repeat clients, a testament to the satisfaction and confidence our customers have in our work. At Safeway Build Ltd, we don’t just build — we build lasting relationships, turning your vision into reality with professionalism, transparency, and dedication. Whether you are looking for loft conversions, extensions or a refurb, all our services are carried out carefully, efficiently and to an exceptionally high standard of quality. We are happy to undertake any domestic work. At Safeway Build Ltd, no job is too big or too small.
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Latest review:
Kitchen Fitting- 10 Feb 2026
Florin and team were a joy to work with. Very communicative and worked to a great timeframe. Lots of little extra jobs were completed at no extra charge. Cost for job was reasonable and the tiling was immaculate - would definitely use Florin again. Would highly recommend!
N EXTENSION KINGS LTD
Rating: 5 out of 5
Extension Builder in Clapham
I've been working in building trade for over 15 years , we can undertake any job small and big from foundations to the roof and anything between. We can provide any references,Me and my team take pride at what we do and we do it first time right .our work is second to none , and proof of that is that you don’t pay anything upfront till you are fully satisfied with the quality.
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Latest review:
Great job by Nick and the team, good attention to detail and very helpful, they went the extra mile to get a nice finish and make sure we were happy. We used after a neighbour also had a good experience.
Morden Lofts & Extensions Ltd
Rating: 5 out of 5
Extension Builder in Clapham
Morden Lofts & Extensions Ltd with over 20 years of experience, we specialise in delivering exceptional loft conversions, extensions and renovations that transform houses into dream homes. Our team of skilled professionals brings together a wealth of knowledge and expertise in the construction industry. We have successfully completed numerous projects, earning a reputation for delivering outstanding craftsmanship and exceptional customer service.
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Latest review:
We had refurbishment of separate bathroom and toilet converted into one large bathroom with new 5 piece suite including electric shower unit . Complete redesign and new plumbing and electrics done to fit requirements , floor to ceiling tiles and heated towel rails . We were very happy with the work done . Muhammad and his team were always punctual and reliable in their workmanship . They were very courteous , polite and kept us up to date as the job progressed from start to finish. The job was completed to a high standard and premises always left clean and tidy . Highly professional team and would definitely recommend .
SIM Building Services Ltd
Rating: 5 out of 5
Extension Builder in Clapham
SIM Building Services Ltd is a construction company providing services in Croydon/London and surrounding areas. Our team has over 20 years of combined experience in residential, commercial and interior/exterior construction across all trades. We’re dedicated to a high level of customer service and will take the time to make sure that you are comfortable with the services we are providing.
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Latest review:
Extensions- 18 Sep 2022
Dritan is genuine and a man who keeps to his word. Very happy with him and his team. 100% recommend to others.
Volodymyr Girkovskyi
Rating: 4.7 out of 5
Extension Builder in Clapham
I am responsible, I do my job carefully, I have extensive experience in building and renovating houses.
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Latest review:
Handyman- 9 Oct 2025
Good job, done as agreed
DR PROGRESSIVE BUILDING LTD
Rating: 5 out of 5
Extension Builder in Clapham
We are reliable and friendly company for domestic and commercial projects. We can undertake all aspects of building including new builds, extensions and loft conversions, house refurbish, fitting kitchens and bathrooms and a whole range of larger home improvements. Our aim is to deliver a high quality of service that meets your needs and your budget.
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Latest review:
Kitchen Fitting- 27 Feb 2026
Worked really hard and did a great job. Would recommend Darek for any refurb job.

4.1

Top rated Extension Builders

Our Extension Builders in Clapham, are rated 4.1 out of 5 based on 17 reviews from customers like you.

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

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 Clapham 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 Clapham who are available and interested can respond to your post.

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

What are the hourly rates of extension builders in Clapham?

Before getting started with your extension project, it’s important to have a clear budget in place. On average, extension builders in Clapham 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 Clapham extension builders near you on MyBuilder. This allows you to compare what each quote covers and how much your Clapham home extension project is likely to cost.

Find extension builders in Clapham with MyBuilder

Hiring the right extension builder in Clapham 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 Clapham extension builders. Once your job is live, we’ll share it with home extension builders in Clapham who can express their interest.

Step 2: Compare different extension builders in Clapham

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

Step 3: Hire Clapham extension builders with confidence

After gathering all the information and quotes from your chosen home extension builders in Clapham, 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.

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

What to ask a Clapham extension builder before hiring?

Before hiring an extension builder in Clapham or extension building company in Clapham, 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 Clapham?

An extension builder in Clapham 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 Clapham 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 Clapham?

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 Clapham 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 Clapham 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 Clapham

Can an extension builder in Clapham help with planning permission?

Yes, many extension builders in Clapham 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 Clapham handle everything from design to construction?

Many Clapham 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 Clapham help with materials and finishes?

Yes, most extension builders in Clapham 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.