Extension Builders in Merton

Name: Extension Builder
Brand: MyBuilder
SKU: extension-builder
Rating: 4.3 (23 reviews)

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Some of our top rated extension builders in Merton

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KEVIN CONSTRUCTION SOLUTIONS LIMITED
Rating: 5 out of 5
Extension Builder in Merton
Kevin Construction is a London-based, well-organised construction company specialising in large-scale developments alongside leading UK firms. We offer a full suite of services—from extensions and conversions to structural alterations and landscaping. With a dedicated team, digital management tools, and a focus on quality, we guide every project from planning to successful completion.
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Latest review:
Fencing- 13 May 2026
Kevin turned up on time and did a solid job on my fence. Would use again
Jx refurbishment
Rating: 5 out of 5
Extension Builder in Merton
My name is James Jiang,I got more than 15 years experiences in the trade and my team has built good reputation in London area. Our aim is to deliver complete customer satisfaction with every project we undertake and ensuring our customer’s visions are met.
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Latest review:
James has done a number of projects for us over the past couple of years as we renovate our home. His prices are always competitive and we are always happy with the work he does!
J&D
Rating: 5 out of 5
Extension Builder in Merton
My name is Jacek i have been working as a builder for 15 years in UK I working with a team and we are good at Extensions Refurbishment Kitchens Bathrooms Rendering Plastering Painting
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Latest review:
Plastering- 24 Nov 2019
In the middle of finishing our kitchen job. His plastering has been excellent. Waiting now for a paint finish. Very punctual, honest and thorough with his job. I am very pleased we hired Jacek and will definitely be hiring him in the future. Thank you Jacek.
Vision Construct Group ltd
Rating: 5 out of 5
Extension Builder in Merton
Experienced builders, Vision Construct Limited specialise in all domestic developments Extensions, Lofts, Basements, New Build, Renovations. We have a number of years experience of working in the industry, we have done many different projects, New Build, Extensions, Loft Conversions,Basements. We take on projects of all sizes, from small renovation works to project managing your new extension.
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Latest review:
Ivan and his team completed a full loft conversion at our terraced house, and we couldn’t recommend them more highly. They did a fantastic job from start to finish and were a pleasure to work with. Communication and project management throughout the project was excellent, and their commitment really showed. Nothing was ever too much trouble to ask. The project was completed within the estimated timeframe, which was especially appreciated as it finished just before Christmas. The team was very considerate while working in our home, and we stayed in the house for the entire duration of the project with minimal disruption. In addition to the loft conversion, they also replaced all our doors with fire doors and installed new flooring throughout the house, all to a very high standard. We’re absolutely delighted with the results and would highly recommend Ivan and his team to anyone considering similar work.
LUCID BUILDING LTD
Rating: 4.5 out of 5
Extension Builder in Merton
We at Alder Tree Construction LTD are a specialists high-end London based construction company. We love what we do and pride ourselves on our work methods and exacting standards. Every project we take on receives special attention and we are heavily invested in the delivery process. A dedicated Team is assigned to each and every project so a personal service is always guaranteed. Our success is based on our honest approach.
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Latest review:
Handyman- 14 May 2018
I had an issue with one of my lights. Pawel came on time and was very helpful, polite and efficient. He did the job quicker than expected and also followed up the following day. I would highly recommend.
Areebahmad
Rating: 4.5 out of 5
Extension Builder in Merton
Professional & Trustworthy We are a full-service handyman company providing reliable, high-quality home repair and maintenance solutions. From minor fixes to larger improvement projects, our skilled professionals handle every job with precision, honesty, and care. We pride ourselves on clear communication, fair pricing, and getting the job done right the first time. Friendly & Local Your go-to local handyman for all the little (and not-so-little) things around your home. Whether it’s repairs, installations, or general maintenance, we show up on time, treat your home with respect, and leave things better than we found them. No job is too small—just honest work you can count on. Modern & Marketing-Focused We make home repairs simple. Our handyman services are designed to save you time, stress, and guesswork. Backed by experience and attention to detail, we deliver dependable results for homeowners and small businesses who want quality work without the hassle. Short & Punchy (Great for a website header) Reliable handyman services for repairs, maintenance, and home improvements—done right, on time, and at a fair price.
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Latest review:
Bathroom Fitting- 14 Mar 2026
Work completed to a high standard.
Elgon Construction Limited
Rating: 5 out of 5
Extension Builder in Merton
Be assured that your home is in good hands. We have provided building services for 18 years in London. The advantages of the company are a high quality of service and punctuality.
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Latest review:
Painting & Decorating- 17 Nov 2023
From connecting with Elgon to having the job done it was a smooth process. Elgon was professional friendly and put me at ease straight away. Will definitely use them again in future.
scarlett building solutions
Rating: 5 out of 5
Extension Builder in Merton
Scarlett Building Solutions has a fully qualified work force with a wide range of construction skills, we excel in Structural steelwork,chimney removal,Fireplace installation,Extensions and flat roofing. We are driven by client satisfaction and aim to be efficient, clean, on time and within budget.
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Latest review:
Extensions- 11 Jul 2012
Richard was very easy to deal with and kept us well informed of progress throughout the build. He was very accommodating to all our requests, including taking a week off shortly after the start of the build so as to not disturb my fiancees night shifts. The final finish is great, and we're very happy with the extension. Thoroughly recommended!
Wimbledon Developers Limited
Rating: 5 out of 5
Extension Builder in Merton
Ivan Demian, experienced builder, established Wimbledon Developers Limited specialise in all domestic developments Extensions, Lofts, Basements, New Build, Renovations. We have a number of years experience of working in the industry, we have done a range of different projects, New Build, Extensions, Loft Conversions,Basements. We can take on projects of all sizes, from small renovation works to project managing your new extension.
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Latest review:
Ivan and his team were excellent. I would recommend them in a heartbeat. They were polite and a joy to work with. They completed the works on time, within budget and to a very good standard. Thank you Ivan!
Alfa style LTD
Rating: 5 out of 5
Extension Builder in Merton
Specialists In Loft Construction,house extension and renovation . We can convert your loft to maximise your living space,by converting it to create a new bedroom,bathroom,office or playroom. Alfa style ltd the primier home conversions company you can trust for reliable,honest and quality workmanship. Here at Alfa style ltd we offer high quality loft conversion in South West London and surrounding areas.
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Latest review:
We had the pleasure of working with Alfa Style Limited on our loft conversion and we can recommend them highly and without reservation. Their work is incredible, attention to detail outstanding – our build was done with care and precision. They turned up on time every day, worked incredibly hard and quickly. In addition, they were extremely clean and tidy in the workplace – they never left the worksite in disarray. This is the first time we have done such a big project – Ruslan, Slava and their team were amazing. They were brilliant at explaining what was going to happen, day by day, week by week and translated the more technical information! No question or query was too much. The service after the build had finished has also been great, calls to check everything is OK and any queries we have, they are only a phone call away. We have had so many compliments from family and friends who have seen the finished build … it has made a huge difference to our house, we could not be happier.
O&C General Construction ltd
Rating: 4.2 out of 5
Extension Builder in Merton
O&C General Construction is a construction company that specializes in renovations and general construction. The company has a wide range of experience, from renovations to new construction, and is able to provide a high level of service and quality workmanship. What inspired us to start our own business is adding value to people’s lives, by creating the perfect home for each client, by listening to their needs and create a project that’s perfect for them.
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Latest review:
Restoration & Refurbishment- 19 Apr 2026
Didn’t return to finish the job, respond to calls or messages in response to finishing the job. Sadly wouldn’t hire Ovi & Mihai (O&C) again. Friendly & responsive initially. Worked well, on time, eager to please, did a good job - not perfect but adequate, average attention to detail but corrected when asked. We initially had a faux chimney put in, they touted for more work & provided alcove shelving/cabinet ideas which we subsequently hired them for. They worked intermittently (dad around for first half of job then left for Romania) as this was agreed as best for both parties. However they left the job incomplete once paid (were paid on time, each time, with no bargaining). Didn’t respond to texts or calls, leaving cabinet doors unfinished, large chips & cracks unfilled. Laminate was also poorly cut around hearth stone, left chimney cutout unfinished with no cement to the base. Lack of respect and wouldn’t hire again as cannot trust they won’t disappear. Note previous reviews.
Sorin Marian
Rating: 5 out of 5
Extension Builder in Merton
I have been working in the construction industry for over 16 years, gaining experience across a wide variety of projects. My work has ranged from bathroom and kitchen installations, through to full refurbishments, extensions, and even new builds such as small blocks of flats and luxury multi-million-pound houses built from the ground up. I am based in Sutton, Surrey, and take on projects across the local area as well as surrounding parts of London and the South East. My skills cover all aspects of building and renovation, including structural work, high-quality finishes, and complete project management. Over the years I’ve built a reputation for reliability, problem-solving, and delivering projects to a high standard. Clients choose me because I treat every job with the same attention to detail, whether it’s a small home improvement or a large new build. My philosophy is simple: to provide honest, dependable work that adds long-lasting value to every property.
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Latest review:
Driveways (Paved & Loose)- 6 Dec 2025
So happy with drive sorin done the best job so happy with drive so professional and cleaned everything after he finished i will definitely be hiring him again A ********
alpha green construction
Rating: 5 out of 5
Extension Builder in Merton
I have 25 years experience in the trade.specialise in innovation and reliability. Trade built company generally around masonry , roofing and all other structural undertakings. We specialise in loft conversions and house extensions , masonry and landscape gardening. We also provide design and build schemes for the above topics.
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Latest review:
Extensions- 14 May 2019
We love Berry, he has followed our project from the beginning to the end and he has been there all the steps of the way. He listened to our ideas and enriched them with more of his adding his special attention to details skills. For every problem, we had along the way he talked to us making sure we were happy with alternative solutions. Plus he is able to create a friendly working environment which makes the invasion of your house less intrusive, he has been very respectful of our space. We can genuinely say that he has gone beyond our expectations, and will be very happy to do future works with him. Luca and Nick
FLYNN properties
Rating: 5 out of 5
Extension Builder in Merton
With over 10 years experience and always producing high quality finishes. From kitchens, bathroom to extensions and always with a good positive happy attitude. let us work with you to design and achieve exactly what you’re looking for.
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Latest review:
Tiling- 7 Aug 2023
Paul was great. Easy regular comms. Arrived early on the day and fit me in as best he could. Straight to it, great work, very professional and sorted out some other problems as they were discovered. Talked me through options and did what was asked to a very high finish. Would highly recommend and use again.
Attique & Sons
Rating: 5 out of 5
Extension Builder in Merton
Hi, I’m a qualified plumber and gas safe with over 15 years of trade experience. I have worked on full house renovations, commercial sites and new builds over the course of my career. I can do the following types of jobs. Plumbing Bathroom Fitting Gas Safe Central Heating Kitchen Fitting Boiler Installation
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Latest review:
Plumbing- 19 Dec 2021
Abdul cane to estimate the job. He started working the next day. He changed a completed bathroom. New toilet, new basin and new shower and base. Also fitted a hot water boiler for the basin. He completed the job and I was happy to pay him for his speedy work.
Building Decorating
Rating: 5 out of 5
Extension Builder in Merton
I am a certified building technician with over 30 years of experience in construction, home improvement and maintenance projects. My aim is to provide all clients with first class service and a high standard of workmanship.
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Latest review:
Extensions- 21 Apr 2019
The initial job was to complete a ground floor extension and house refurbishment. The job covered kitchen extension, underfloor and central heating, re-pluming, laying flooring, stair refurbishment, downstairs WC, patio, painting/decorating and much more then i can remember. I posted the job on Mybuilder and got several quotes from different firms. I was impressed with Dariusz as he requested the plans in advance of attending and provided a quote that was reasonable, before moving forwards I asked if I could see/visit a couple of jobs that Dariusz had completed recently which he arranged the feed back from ex-customers was excellent and the work was competed to a impressive standard. I was very impressed with Dariusz and his team, anything he was unsure of regarding the design he would ask before moving forward any surprises that cropped up with he dealt with, the team where clean and tidy. We are extremely happy with the work completed, guest that visit always mention the quality of the finish. I have recommended Dariusz to friends and family as well as use him for other jobs we have since planned. I would like to thank Darisuz and his team for all there hard work!

4.3

Top rated Extension Builders

Our Extension Builders in Merton, are rated 4.3 out of 5 based on 23 reviews from customers like you.

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

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

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

What are the hourly rates of extension builders in Merton?

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

Find extension builders in Merton with MyBuilder

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

Step 2: Compare different extension builders in Merton

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

Step 3: Hire Merton extension builders with confidence

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

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

What to ask a Merton extension builder before hiring?

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

An extension builder in Merton 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 Merton 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 Merton?

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 Merton 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 Merton 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 Merton

Can an extension builder in Merton help with planning permission?

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

Many Merton 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 Merton help with materials and finishes?

Yes, most extension builders in Merton 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.