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 city builder
No reviews yet
Extension Builder in Clapham
London City Builders (LCB) is a professional who specialises in designing and creating stunning interiors for high-end homes. We have a deep understanding of the latest trends, materials, and techniques in interior design and can transform any living space into a beautiful and functional work of art.
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I. N.S CONSTRUCTION & LANDSCAPE LTD
Rating: 5 out of 5
Extension Builder in Clapham
We beat all the quotes!
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Latest review:
Extensions- 22 Dec 2025
Good honest communications, good work progress and easy to get on with. Mutual respect shown both sides.
pmlarc
Rating: 5 out of 5
Extension Builder in Clapham
We are RIBA registered architects with a wide range of experience of over 25 years within architecture, design and construction. We are experienced at new builds, full refurbishments, extensions and conversions, and have completed numerous residential and commercial projects in London and beyond.
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Latest review:
Architecture- 13 Apr 2015
We are extremely happy we chose to use Phil for our loft and extension design. Phil is professional, extremely accommodating and a pleasure to work with. He was always contactable, punctual and happy to spend a lot of time with us to discuss designs and the planning process. His design ideas were smart and he presented us with a number of workable options. We wouldn’t hesitate recommend Phil and would certainly use again for any architectural works.
Ben
No reviews yet
Extension Builder in Clapham
Over 10 years of experience in the building trade, building new and outstanding homes. Specialised in loft conversions, house extension, kitchen refurbishment, bathrooms, full house remodel and refurbishment, garden and pavements, roofing and repairs, certified plumbing, gas and electrician.
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Morris Carpentry & Construction ltd
Rating: 5 out of 5
Extension Builder in Clapham
Morris Carpentry & Construction are a family run business with over 40 years experience within the building industry. All our team are fully qualified in their own individual trades, which covers all aspects of building projects. We take the upmost pride and satisfaction in all of our work and treat your home like our own. We are more than happy to provide free estimates for any work you may require.
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Latest review:
From start to finish perfect, very good communicator, no hidden extras, very clean, can't knock him or the lads at all Many thanks Jack for a job egoless done Highly recommend
NB Building services
Rating: 5 out of 5
Extension Builder in Clapham
Hi my name is Nikolay and I’m working with small team of 4 people more then 8 years!We are doing loft conversions,house extensions and full refurbishment!We have lot of jobs done and more then happy clients!Have a large range of recommendations!Public Liability Insurance also available!
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Latest review:
Extensions- 9 Oct 2022
We engaged NB Building Services to build an extension (new garage and room at the rear) and extensively refurbish/remodel a bungalow. I met a number of builders/building contractors but I felt immediately comfortable with Nick right from the start. It was the first time we were ever starting such a project and we wanted to follow our instinct and go with someone we could be comfortable with over the duration of the project. Right from the start Nick came across as someone who is genuine and who looks to understand your requirements. Also, as my project had a few uncertainties that could affect the scope of the project I was looking for some flexibility and I felt that Nick and his team could provide that. Nick and his team (Stefan, Boris and Ilco) work very well together as a cohesive team. Nick provided a day-to-day customer contact while scheduling tasks on the building site and coordinating material deliveries. Every member of the team worked a full day and on occasions where it was important to finish something on the day, they would stay late to finish the job. What impressed me most when the work started is that the entire team is multiskilled – they do everything from bricklaying, timberwork, roofing, plaster/skimming etc. This helped me immensely when there were minor changes or modifications. That meant we didn’t have to wait for the bricklayer or plasterer to return to the site again. Nick also operated the heavy machinery like digger/breaker etc. Once the initial structure was complete the team again impressed me with their attention to detail when they moved inside to lay down plumbing, electrical wires, gas pipes etc. Nick and Stefan took the lead on the fine finishing tasks inside while Boris and Ilco provided important support and completed a lot of other tasks inside and out. It was during this critical phase when communication is most important that I appreciated Nick’s effort to keep us informed. As far as quality of work is concerned while we were happy with everything, I think the tiling work of both Nick and Stefan is outstanding. Our project lasted for about 8 months and while there were lots of discussions on areas of the project that I did not understand and I asked a lot of questions and also changed my mind on some things I don’t remember I we ever even had a minor argument. This I felt was an important win. Nick was also generous with his time and provided help to other trades who came on site e.g. window fitters, garage door installers; boiler installers; electricians etc. Nick and his team returned a few months later to lay down a patio with porcelain tiles for us and also a driveway with block paving. Once again Nick and his team discussed with us in detail what we wanted and provided suggestions based on their experience.
Naksh construction ltd
Rating: 4.4 out of 5
Extension Builder in Clapham
We are a highly skilled, competent, and professional team of builders at Naksh Construction Ltd. We offer all the building services you could require, including additions, new construction, basement conversions, new residential or commercial construction and renovations of your existing bathrooms, kitchens and residences. Not only do we complete this task quickly and professionally, but we also take care to ensure that every job we complete is sophisticated, elegant, and meets your demands and specifications."
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Latest review:
Extensions- 7 Apr 2025
Quotes were provided and the job was agreed upon. The project involved a full house restructuring and extension build. However, after several stages of work, communication with Jas was lost, and his co-worker took the lead on site. Several issues arose, such as recommending smart plumbing equipment for purchase, but their plumbers were unable to install it. The tiling, skirtings, and tiles were not completed. Tiles around the columns were cracked. After Jas's team abandoned the project, another plumber had to install all the remaining items. The job was left unfinished, and we had to find alternative contractors to complete it. Significant time and money were wasted due to persistent communication problems, failure to issue invoices, and numerous other issues. Eventually, Jas and his main labourer stopped responding and disappeared, ignoring phone calls and WhatsApp messages. Be aware of these potential issues.
Buildswell ltd
Rating: 5 out of 5
Extension Builder in Clapham
my name is sehaj the main contractor of buildswell ltd.We are a full facilities management and installation company,If you are thinking of renovating your home,building an extension, or changing your roof. Sehaj from buildswell has a local and trusted construction business to provide maintenance and building services of the highest standard at competitive prices. Very friendly and professional
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Latest review:
Extensions- 20 Jan 2021
Trusted person good quality extension with no delays
Wader construction
Rating: 5 out of 5
Extension Builder in Clapham
Over 30 years of professional bricklaying experience, I specialise in all aspects of brickwork, blockwork, stonework, brick slips, repointing, repairs, extensions, garden walls, fences, RC frame masonry, masonry support systems, paving and slab laying, and general masonry construction. I take pride in delivering high-quality craftsmanship, attention to detail, and reliable service on every project. Whether working on residential, commercial, or heritage developments, I am committed to achieving exceptional results and ensuring complete customer satisfaction. Services Include: Brickwork & Blockwork Stonework & Brick Slips Repointing & Repairs Extensions & New Builds Garden Walls & Boundary Walls External wall insulation system Silicone and acrylic render. RC Frame Masonry Masonry Support Systems Paving & Slab Laying General masonry works. Refurbishments
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Latest review:
Bricklaying- 22 Sep 2026
Phenomenal from start to finish. Care and effort taken at every stage to rebuild a garden wall and there was great communication throughout the job. Highly recommended and will definitely work together on future projects. Lucky to have found!
Simply Extensions and Lofts Ltd
No reviews yet
Extension Builder in Clapham
We're specialist’s in house extensions, refurbishments and Loft conversions in South London and all surrounding suburbs, with the aim to deliver. Everyone that we use for finishing, is a trade. This gives you a very high quality finish that is seldom achieved by a 'General-trade'. We are fast, clean and produce showroom quality. Our individual professionals are more than just people we work with, they are people we know. We make or exceed our deadlines to ensure client satisfaction!
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Croham Builders
Rating: 4.7 out of 5
Extension Builder in Clapham
You can rely on Croham Builders to guide you through every step of your project. We take pride in providing our customers with expert advice throughout all construction phases. And although we think modern, our team is traditionally trained and is dedicated to high-quality workmanship using the latest techniques. houses, bungalows, etc. Office building Structural repairs and extension Building conservatories
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Latest review:
Conversions - General- 23 Nov 2017
Calvin and Jimmy have been absolutely brilliant, and have been the best builders that I have employed. So much so, that I have subsequently asked them to do a whole shopping list of things, from fitting a kitchen to removing an old fireplace. They are always on time, very polite, kind and knowledgeable. Best of all, they get things done quickly without any fuss. Calvin has been invaluable in sourcing items from trade required for the latest project, and clearly talks through requirements of any project. I would very happily recommend them for the excellent value they offer and fantastic level of workmanship.
Happy Building London Ltd
Rating: 5 out of 5
Extension Builder in Clapham
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.
Artem
No reviews yet
Extension Builder in Clapham
Hi Everyone!!! I’m a reliable and experienced handyman based in South London with over 13 years in construction. I specialize in all kind of repairs, refurbishing, bathroom renovation, kitchen renovation, lofts conversion, extensions, electricity ,plumbing, painting, and general maintenance. ✅ Fast, clean, honest service ✅ Always on time — I respect your time and home ✅ Fully equipped + liability insured No job too small — message me for a free quote!
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Meshi
Rating: 5 out of 5
Extension Builder in Clapham
Meshi Finesse
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Latest review:
Handyman- 28 Nov 2021
Did an amazing job with the shed
Ebbstone Construction Ltd
No reviews yet
Extension Builder in Clapham
We have extensive experience in construction industry and provide following services New Build Internal Conversion Refurbishment Extension GRP or Pitched Roof Flooring Loft Conversion General Property Improvements Painting & Decorating Maintenance & Repairs
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JANBA constructions Ltd
Rating: 2 out of 5
Extension Builder in Clapham
Janba Constructions is a trusted, family‑run company with 11 years of dedicated service and over 18 years of hands‑on industry experience. I specialise in high‑quality extension work, general plumbing, handyman services, driveways, and a wide range of general home improvement jobs. My approach is simple: reliable workmanship, honest communication, and a commitment to getting every detail right. Whether it’s a small repair or a full extension project, I bring the same level of care, skill, and professionalism to every job. Customers choose janba Constructions because they know the work will be completed to a high standard, on time, and with pride. If you’re looking for someone experienced, dependable, and genuinely passionate about improving homes, Janba Constructions is here to help.
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Latest review:
Handyman- 20 Mar 2026
Not happy with, he was told to sand down paint on metal spiral staircase in the garden. Since I couldnt check before dried out I noticed paint peeling off, plant broken, garden door with spot of pain .Since I was short woth paint je went and bought another tin of paint which is primarily for wood. Proce tag £200 without paint, borough brush from me and roller

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.