Extension Builders in Barnes

Name: Extension Builder
Brand: MyBuilder
SKU: extension-builder
Rating: 4.1 (18 reviews)

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Some of our top rated extension builders in Barnes

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D&C Building
Rating: 5 out of 5
Extension Builder in Barnes
Top quality, reliable team and always in time !
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Latest review:
Fencing- 9 May 2022
Very nice and polite guy. He did his job as promised. The price was fixed and job was done neatly. He tidied away all the rubbish and out back everything in order which I was very pleased with. The communication was great and everything went very well. We enjoy our garden more than before now.
Bawabuilder
Rating: 5 out of 5
Extension Builder in Barnes
We can extend
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Latest review:
Fencing- 13 Mar 2026
We hired Bawa to install new fencing, and he did a fantastic job from start to finish. You can immediately tell he’s an all-rounder who understands construction very well. The work was carried out efficiently and to a high standard. Bawa has a great attitude, is very hard-working, and clearly takes pride in what he does. Communication was easy throughout, and the whole process felt smooth and professional. It was a real pleasure having Bawa work for us, and I wouldn’t hesitate to recommend him.
REWORKS LONDON LTD
Rating: 5 out of 5
Extension Builder in Barnes
Our team comprises eager on-demand workers, with years of experiences, who deliver exceptional services to both residential and commercial customers all around London. Whether you need a painter that will not miss a single mark, or an electrician that assists you in emergencies, we will make sure to send you our specialized and competent workers for all your needs.
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Latest review:
Gas Work- 11 Dec 2020
Repaired and very happy!
KBS London Ltd
Rating: 5 out of 5
Extension Builder in Barnes
We are a North London Carpentry and General building company. I am a Qualified Carpenter from New Zealand, I have 30 years experience with 20 in London. We can carry out all works on residential, retail and commercial projects, from strip out to completion. We have a network of tried and proven tradesmen and suppliers. We are Quick Clean happy to work out of hours if necessary. I will do you a free quotation and happy to discuss works and guide you if necessary. Karl
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Latest review:
Carpentry- 8 Jun 2026
Responsive and good communication - delivered the job as planned and quoted. Would recommend.
Flanagan Construction
Rating: 5 out of 5
Extension Builder in Barnes
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
Dimitrios Spanos
Rating: 3.7 out of 5
Extension Builder in Barnes
KDG Building & Consulting Services is specialist in all aspects of general building and property maintenance, extensions, loft conversions, structural waterproofing and painting and decorating related works for both private and commercial Clients in Central and Greater London. We take pride in our bespoke building services and make sure every project is nothing less than what our Clients will expect, driven by our values to deliver long lasting and high standards results.
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Latest review:
Tiling- 28 May 2020
Did not arrive to complete the job or have the professionalism to cancel in advance. Unreliable company.
KG BUILD
Rating: 5 out of 5
Extension Builder in Barnes
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.
Agnuss Construction Ltd
Rating: 5 out of 5
Extension Builder in Barnes
We are a construction company that operates in the local area mostly, but we can also cover all the other areas of Greater London. Our Services include Extensions, Loft Conversions, Refurbishments, and basically all the aspects of building work. We specialise in residential and business projects.
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Latest review:
Agnuss Construction carried out and completed our house renovation, kitchen extension and loft extension successfully. Elio and his father, Mario were very communicative throughout and very reliable. The works were carried out on time and on budget. I would be happy to recommend Agnuss Construction and use them again in the future.
Reliance utilities
Rating: 4.5 out of 5
Extension Builder in Barnes
Hello my name is Robbie, I am a qualified plumber and heating engineer, that’s also trained in electrics. I enjoy working out problems and helping customers come to the best resolution to their problems.
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Latest review:
Kitchen Fitting- 18 Aug 2026
Excellent job done by Robbie and his mate. Replaced the kitchen unit and did a couple of other jobs around the flat all in one afternoon. Great attention to detail and reasonable price. Would definitely use Reliance again. Thanks from Anne and Peter in Roehampton
A abrahim
Rating: 5 out of 5
Extension Builder in Barnes
Im professional bricklayer with 12 year experience I work with the companies and I work with my own the 12 years I can do all design brick and block
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Latest review:
Bricklaying- 23 Aug 2026
Absolutely excellent, a real pleasure to deal with and a delivered a high standard of work exactly as agreed - well recommended.
J & M loft conversion ltd
Rating: 5 out of 5
Extension Builder in Barnes
I’m a skilled landscaper with experience in designing and creating outdoor spaces that are both functional and visually appealing. From turfing and patios to fencing, planting, and garden maintenance, I take pride in delivering high-quality work with attention to detail. My goal is to transform outdoor areas into spaces homeowners can enjoy all year round. Reliable, hardworking, and customer-focused, I ensure every project is completed to the highest standard.
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Latest review:
Fencing- 3 Sep 2026
Very happy with the job. Easy to schedule and arrange, and the work was completed quickly and professionally. Reliable service and a good result. Would definitely recommend.
M-CBS Mario Carpentry & Building Services
Rating: 5 out of 5
Extension Builder in Barnes
We offer a wide range of services from small repairs to full extensions, conversions and refurbishments. We cover interior and exterior work for both residential and commercial clients All work is carried out by highly skilled and qualified craftspeople.
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Latest review:
Bathroom Fitting- 15 Nov 2017
Mario was an absolute gem from start to finish. After a leak left our only bathroom out of action Mario came in and managed the full project to perfection (and also had a great tiler and electrician who did some other works). Six months on and I cannot fault any of the works. Highly recommended.
HaliBuild
Rating: 4.7 out of 5
Extension Builder in Barnes
We have been working as subcontractors for over 15 years now and decided it was time to branch out on our own, hence you find us on MyBuilder, We are eager to get some work done and some positive feedback to go along.
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Latest review:
Extensions- 26 May 2021
Ali Revani at Halibuild provided us with a quote which we accepted. 3 days before the job start date Ali Rezvani called and explained that they had under priced and they would want another £3000 to start the contract. Ali Rezvani then started the job but again admitted that they under priced the job and walked off the site several months into the project after the following major quality issues which needed to be addressed: Pouring the foundations in the wrong place, building the extension in the wrong place, building the roof incorrectly, installed roof steels in the incorrect position, built the extension rear wall too high, the plumbing to the boiler needed to be redone, all the plastering has had to be redone, skirtings needed to be redone, staircase had to be rebuilt. The list goes on and is 40+ points long. This has been a terrible experience and we face serious losses and a stressful dispute."
Lee Constructions
Rating: 5 out of 5
Extension Builder in Barnes
I have over 20 years Groundwork experience, including all aspect of the building trade. My catalogue of works include the following: Loft/house extensions, underpinning, general repairs, driveways, paving, landscaping, property management, refurbishments and project renovations. I am able to access various specialists to support all your building needs. I pride myself on my work ethic, reliability, transparency and honesty. I am happy to provide genuine references upon request. Please contact me for a no obligation quote. Thank you!
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Latest review:
Groundwork & Foundations- 9 Jul 2026
The job was well done and as per quoted price. I’m pleased with the work, the patio was cleaned up nicely when finished and I’d happily call on Lee constructions again
mohamad abou ali
Rating: 5 out of 5
Extension Builder in Barnes
We deliver a wide range of design and build construction projects including: • Full House Renovations • Basement Installations • Extensions • Loft Conversions • New Builds Turn Key • Contract Site Fit Out Works • Commercial Premises Refurbishments
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Latest review:
Conversions - General- 19 Nov 2022
Very impressed with the work from Mohammad - very excellent work. Highly recommended.
Apex Plan & Build LTD
Rating: 5 out of 5
Extension Builder in Barnes
Apex Plan & Build is your trusted partner in turning vision into reality. Specializing in both domestic and commercial construction, we are dedicated to transforming houses into dream homes and businesses into efficient, modern spaces. With over 30 years of collective industry experience, our team ensures every project is completed to the highest standard, offering expertise in M&E works, including air source heat pumps and MVHR ventilation systems. We also bring cutting-edge innovation to your space with smart home automation solutions like Loxone and Control4, creating environments that are not only beautiful but also intelligent and energy-efficient. Apex Plan & Build is where your dream project is our top priority.
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Latest review:
Very professional and organised. My rear extension renovation was impeccable, thorough knowledge of building regulations with a variety of services to choose from really put me at ease. The venetian plaster feature wall has become the centrepiece of our home.

4.1

Top rated Extension Builders

Our Extension Builders in Barnes, are rated 4.1 out of 5 based on 18 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 Barnes?

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

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

What are the hourly rates of extension builders in Barnes?

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

Find extension builders in Barnes with MyBuilder

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

Step 2: Compare different extension builders in Barnes

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

Step 3: Hire Barnes extension builders with confidence

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

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

What to ask a Barnes extension builder before hiring?

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

An extension builder in Barnes 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 Barnes 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 Barnes?

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 Barnes 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 Barnes 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 Barnes

Can an extension builder in Barnes help with planning permission?

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

Many Barnes 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 Barnes help with materials and finishes?

Yes, most extension builders in Barnes 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.