Extension builders in Merton

Name: Extension Builder
Brand: MyBuilder
SKU: extension-builder
Rating: 4.6 (20 reviews)

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Some of our top rated extension builders in Merton

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DF Construction
Rating: 5 out of 5
Extension Builder in Merton
DFGC are commercial and residential refurbishment specialists. We've created partnerships with high profile companies to complete large scale projects, in the South East of England - shown on my profile. We are known for a wide range of undertakings, from complete refurbishments, extensions, bathrooms, driveways, to name a few. There's very little we can't do, with regards to construction. We're a one stop shop for all your construction needs - we can take your vision and make it a reality.
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Latest review:
Extensions- 13 Dec 2021
Couldn't recommend Domi & Emile enough. They have great building knowledge and kept us informed and up to date throughout the whole building process. The job was finished to a high standard and they even came back free of charge to tie up a few snags a few weeks later. Great builders and a great team!
London project contractors ltd
Rating: 5 out of 5
Extension Builder in Merton
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!
QUOTRIX CONTRACTORS & ENGINEERS LTD
Rating: 5 out of 5
Extension Builder in Merton
1. Design and Planning; 2. Development of residential & commercial buildings; 3. Refurbishment & Renovation of domestic building projects, and 4. Any other types of building works including extensions and conversions.
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Latest review:
Kitchen Fitting- 4 Aug 2020
Quotrix contractors did a fantastic job of kitchen refurbishment. Great friendly service by all of the team, from the sales through to installation. Brilliant job, all round!
Meshi
Rating: 5 out of 5
Extension Builder in Merton
Meshi Finesse
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Latest review:
Handyman- 28 Nov 2021
Did an amazing job with the shed
De Winter’s Property Services LTD
Rating: 3 out of 5
Extension Builder in Merton
Welcome to De Winter’s Property Services LTD – we proudly cover all aspects of work, both domestic and commercial. Whether it’s your home or business, our experienced team delivers high-quality, reliable solutions tailored to your needs. I’m Aidan De Winter, director of De Winter’s Property Services. I’ve been a fully qualified plumbing and heating engineer since 2014, with extensive experience across domestic and commercial sectors. Over the years, I’ve built strong knowledge in many areas of the construction industry and a trusted team of skilled tradespeople around me. Based in South London, we’re happy to take on jobs across all of London and beyond. Why choose us? With a reputation for quality, honesty, and reliability, we deliver every job to the highest standard—on time and within budget. No job is too big or too small, and we treat every project with the care it deserves.
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Latest review:
Plumbing- 24 Jan 2026
I did hire Aiden De Winter for the job. He came and inspected the problem and sent us a link to purchase a new pump. I paid him for this work. We purchased a new pump, and he decided not to finish the job and come back to install the pump. This caused a lot of problems as he was the second plumber I hired for this job, and now we have to find a third plumber! What a waste.. how hard is it to come back and fit the pump! Do not use this company at all costs!
Style Building Ltd
Rating: 5 out of 5
Extension Builder in Merton
Style Building Limited is a leading building contractor within the residential and commercial sectors, our aim is to provide our clients with an experienced management team that can undertake the full range of construction projects, from the sensitive refurbishment such as your project to high specification new build projects.
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Latest review:
Restoration & Refurbishment- 4 Jun 2013
Kiril and his team did an excellent job. Kiril puts you at ease and he knows how to communicate well answering any queries fast. His quote was very competitive. He went out of his way to assist me with sourcing items such as coving, cupboards, ceiling roses and skirtings. Highly recommended.
JWC&BS LTD
Rating: 5 out of 5
Extension Builder in Merton
I am fully qualified carpenter with NVQ qualifications. I’ve had experience working with listed building, extensions , loft extension, roofing , first fix , second fix carpentry , kitchens and flooring
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Latest review:
Decking- 30 May 2020
Great work. Nice and tidy. Would use again for general carpentry needs.
Pulse Decorating and Refurbishment Limited
Rating: 5 out of 5
Extension Builder in Merton
Pulse Refurbishment is run and managed by Andrew and Ana, and we work with and outstanding team. The forever home you been dreaming of is just click away, be it a full refurbishment with extension and loft conversion or just a new kitchen. We care about our customers and strive to offer the very best customer service and workmanship every time. We believe in quality, honesty, and good work ethics.
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Latest review:
Andrew, Ana and the team built a wonderful downstairs cloakroom for me: the finish is excellent, they matched the original features of the house so well that it looks like it has always been there and they were professional to deal with throughout.
CSKA 1948 Ltd.
Rating: 5 out of 5
Extension Builder in Merton
Using STAR Construction, gives you peace of mind that you are choosing a Contractor who uses properly trained and qualified operatives. All materials used are of the best quality and all work is fully Insured and Guaranteed. We offer a competitive price and our work is of the highest standard. If you have seen the home of your dreams, we at STAR Construction will make sure that this home will become a reality! Here to help, so do not hesitate to contact us.
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Latest review:
Kitchen Fitting- 21 Mar 2016
Vass and his team installed our Magnet Kitchen to perfection he utilised every space with great ideas I could not give enough praise for his craftsmanship and he takes great pride in his work, I would definitely recommend him. Thanks to Vass & Anthony
KG BUILD
Rating: 5 out of 5
Extension Builder in Merton
With your specifications and our expertise, we happily take on any building work and produce excellent results. Extensions, Loft conversions, kitchens, bathrooms, garden rooms/studios/outbuildings, roofing, flooring, carpentry and joinery etc
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Latest review:
Carpentry- 13 Dec 2025
Kwame did a great job and was thoughtful, communicative and very skilled with the work he was carrying out on our joists. I would recommend KG build to anyone looking for a good price and a high standard of work.
GNK Home Makeover
Rating: 5 out of 5
Extension Builder in Merton
We are a team of professionals who offer competitive prices, 3D visualisation, design guide, CAD plans, materials supply, professional advice and project management. Contact us for a free quote. We have great references.
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Latest review:
Kitchen Fitting- 24 Oct 2016
Kris, Gustav and their team have been absolutely amazing, cannot praise them enough. First of all - the job ended up being a lot larger than initially thought- as decided to replace old ceilings and flooring, walls -everything was uneven to start with. So took everything back to 'bare bones' and pretty much built it up again as a new house. New electrics, water pipes, completely new kitchen and bathroom. I really appreciate they were very straightforward with the estimated costs from the beginning - it did run slightly over budget but nothing too bad as had some contingency funds prepared. I would have hated to be quoted one price then half way through the project to discover it escalates out of control. Thankfully they are really honest and reliable. They were always easy to reach and replied any question I might have had in a timely manner. This was particularly important to me as I was between uk and us at the time so couln't be 'looking over their shoulder' so to speak. Last but not least the finish and quality of works is absolutely amazing! They couldn't have paid more attention to every little detail if it was their own home. For instance I remember last day of work when they were tidying up Gustav came back to put up door stoppers for me, completely on his own initiative. It's just a little touch but goes to show the dedication they've put into the project and care about the finished product.
Beeches Building Ltd
Rating: 5 out of 5
Extension Builder in Merton
Beeches Building undertakes all manner of construction jobs, specialising in residential extensions and refurbishments. With loads of experience and a truly international team, we bring a unique and exciting perspective to every project.
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Latest review:
Nathan and his team were fantastic. I urgently needed a kitchen refit in a rental property between tenancies. Nathan anticipated my every needs. They were fast, efficient and paid great attention to detail. I would highly recommend them and I would use them again.
Clars Build Ltd
Rating: 5 out of 5
Extension Builder in Merton
In collaboration with Trevi Home Ltd, a Surrey-based luxury kitchen, bathroom, and tile specialist, Clars Build Ltd is your top choice for renovation projects. Our skilled team, led by a 25-year-experienced Civil Engineer, offers: - Kitchen and Bathroom Design, Renovation, and Refurbishment - Loft Conversions and Extensions - Comprehensive Property Renovations Contact us today to create a more beautiful and functional home.
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Latest review:
1. Installation of new bathroom 2. Entrance hall, porch and living room plastering, painting, decorating and floor tiling 3. Electric work Laith’s team is hardworking, courteous and very skilled. Extremely pleased with the quality of work. The interior of the house has been transformed by the work and looks really great. Very pleased
D.S builders
Rating: 5 out of 5
Extension Builder in Merton
Hi there I am a reliable tradesman and pay etention to detail. Been in the building industry for over 20 years.
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Latest review:
Tiling- 19 Apr 2023
Steve was very helpful and worked quickly to get the job done He is very knowledgeable and also completed another job for me I would definitely recommend him He helped me choose products and collected materials I needed Very glad I chose him to complete the work
Buildswell ltd
Rating: 5 out of 5
Extension Builder in Merton
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
Refurbishment service gold
Rating: 5 out of 5
Extension Builder in Merton
I am an experienced professional with seven years of industry expertise. I always aim to deliver work of the highest quality, as every client is valuable to me
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Latest review:
Vladimir quoted. Turned up on time and did an amazing job - despite my not buying the correct size doors. He was professional and did an amazing job and was that rare thing- a workman you don’t mind having in your home. I have booked him to do more work after Christmas.

4.6

Top rated Extension Builders

Our Extension Builders in Merton, are rated 4.6 out of 5 based on 20 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.