Extension Builders in Barnsbury

Name: Extension Builder
Brand: MyBuilder
SKU: extension-builder
Rating: 4.2 (20 reviews)

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Some of our top rated extension builders in Barnsbury

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rfi builders ltd
Rating: 5 out of 5
Extension Builder in Barnsbury
Hi! My name is Rifat, I’m the proud owner of RFI builders. I have 30+ years experience in the construction industry having done jobs in, brick laying, plastering, flooring, painting, loft conversions, extensions and many more!
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Latest review:
Plastering- 4 Oct 2024
Mr Rifat did an excellent job for plastering rooms and i would recommend him to everyone highly. The work he has done is to a very high standard and completed in 3 days. His quote was very helpful and comprehensive and he was helpful and very kind and calm. He did not take a break from doing the work, even though i told him to take a seat for 5-10 minutes. He is a very hardworking person. I think anyone to catch him to do a job for themselves is very lucky. I recommend him to everyone because he knows how to do good job.
REA Construction LTD
Rating: 5 out of 5
Extension Builder in Barnsbury
The company’s success is built on the strong belief of quality work, attention to detail and on-time completion. Rea Construction Ltd has an in house team of builders, architects, and interior designers with all the relevant skills and qualifications which enable us to offer a fully comprehensive design and build service. Get in touch today for a free on site consultation.
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Latest review:
Extensions- 8 Dec 2017
We couldn’t be happier with the professionalism and quality of workmanship from REA Construction. The project was delivered within budget and on time. We lived in the property during the work and we, our neighbours and the site were always treated with the utmost consideration. There were almost no hitches and, when they did occur, they were dealt with immediately and thoroughly. Our project team, led by Kristjan and Besi, were universally hardworking, organised and produced work to an excellent standard. Communication is great, the people are wonderful. Renato was someone I felt I could trust from the moment I met him and he never let us down. He and everyone at REA genuinely care about what they do and that their customers have a happy experience. We certainly did and would have no hesitation recommending them to others.
Don & Dorian Limited
Rating: 5 out of 5
Extension Builder in Barnsbury
We are Don & Dorian Limited. We are a family run business based on the corner of Central London in Islington. We have a combined experience of 40 years between us. We specialise in interior renovations, loft conversions, extensions and new builds. We usually undertake a project fully from start to finish as we have many in-house trades from plumbers and electricians to carpenters and painters. We pride ourselves with the quality of work we produce and thoroughness.
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Latest review:
Extensions- 17 Feb 2022
Don and Jake were terrific. Nothing was too much trouble and they provided work to a very high standard. They were extremely competent and I cannot recommend them highly enough. I have done many building projects and they were the first builders that I didn't fall out with!
Vasile Balta
Rating: 5 out of 5
Extension Builder in Barnsbury
Thank you for reading this I’m Vas( owner of BALTA COMPLETE CONSTRUCTION LTD)from 16 started as a apprentice in construction industry, have work over the years on big projects also small ones , when I was about 30 years old whit lots of experience in house refurbishment, extensions and lofts , decided to open my business, it was the best idea I take Ower focus as a business is a hight quality service, on all projects(big or small) and the feedback from the profile prof this As a person in charge whit the projects, I’m very easy to talk to, friendly , also more than happy to sort issues out Thank you for reading this As a business ower focus is on quality, high end finishes and trat each coustumer whit respect, and live them happy after the project is finished
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Latest review:
Conversions - General- 24 Apr 2026
I recently had extensive work completed in my flat by Vas, and I couldn’t be happier with the result. The service was excellent from start to finish. Not only was the quality of the work consistently high, but the whole experience was smooth and stress-free. What really stood out was Vas’s level of skill and versatility. Every aspect of the project was handled with care and professionalism — from plumbing and new water heating pipes, to new electrics, installing a new kitchen, laying a beautiful wooden floor, renovating the bathroom, and even replacing doors with a sliding door system. Each element was completed to a very high standard. On top of that, Vas was friendly, proactive, and easy to communicate with throughout. Nothing ever felt like too much trouble, and it was clear he takes real pride in delivering great results. It was genuinely a pleasure to deal with Vas, and I would highly recommend his services to anyone looking for reliable, high-quality work. Thank you again!
ADJ Builders Limited
Rating: 5 out of 5
Extension Builder in Barnsbury
Hello ..my name is Alfred. I, have over 12 years of experience in building site. Perfectionist in my work and ability to guarantee customer satisfaction. Hard working and ensures all deadlines and targets are met. A good eye for detail, precise and accurate at all times and will complete all work to the highest standards.My experience shows in the finish, with no visible streaks. Polite friendly and helpful.
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Latest review:
Painting & Decorating- 6 Oct 2022
Very pleased with our choice. We initially got four quotes from different builders, most of them were terrible at communicating apart from Alfred. He was very easy to work with, responsive and very careful with our brand new house. His team was hard working, tidy and fast. They completely renovated our garden from removal of old decking and gravel to setting up new fences, levelling and turfing the ground. They also removed our old kitchen, partition wall and carpet, as well as did jobs like plastering, building a wall and set up lights and shelves. We’ll surely have him back soon to work on other jobs.
W.A. Brown Builders LTD
Rating: 5 out of 5
Extension Builder in Barnsbury
I have been in the building industry now for over 40 years, I started as a buidlers labourer back in 1983 for my uncle, working on houses and in offices in the maida vale area.
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Latest review:
Carpentry- 20 Jul 2024
Wayne and his team did a great job. Communication and planning was effective from the start, and stuck to the deadline that was set at the beginning of the project. I’d definitely hire again for my upcoming projects.
Adam Favor
Rating: 4.8 out of 5
Extension Builder in Barnsbury
Our business was founded to offer clients the opportunity to bring a vision to life. As a design & build business we can take your dream home concept and turn it into reality. We will provide you with design plans for your projects and thorough project management. We also have the professional, experienced and quality tradesmen that are essential to complete the construction phase of the project.
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Latest review:
Plastering- 17 Jun 2024
Adam Favor and NOVA Design & Build are a nice bunch of guys and they are reliable/helpful. However, when it came to coving, architrave and flooring, acceptable standards were unfortunately not met. Other specialists had to be brought in to re-do around 20% of the job; namely certain sections of the cornice and door architrave. In the former, a few things were below standard including: 1) not joining the friezes in the correct places, 2) cutting inaccurately, 3) leaving gaps, 4) using silicon as a filler and adhesive. For the door architrave, the wood was misaligned and not glued/nailed properly. The flooring was not laid well because there are huge gaps at times; sometimes at 1 cm. Since the kitchen has been installed, it is too late to take up the floorboards again. The most dubious thing of all in this job was the quote received for decorating which was c. 15k for 47 m2. This included plastering repairs, but ultimately the job got done by someone else to a high standard at 7k.
Ioan Hrit
Rating: 5 out of 5
Extension Builder in Barnsbury
With over 13 years experience I'm confident in all aspects of groundworks including new build and extensions from footings up to damp course, drainage and the slab construction, kerb laying, block paving; drives paths, slab laying, septic tank installation and soakaways.
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Latest review:
Groundwork & Foundations- 31 Oct 2025
Fantastic all round service. Ioan is very hard working, very knowledgeable in his field and is very well organised and experienced with the logistics and execution of all types of groundworks. I would highly recommend.
Done By Tom Ltd
Rating: 5 out of 5
Extension Builder in Barnsbury
Welcome to Done by Tom – we offer a completely bespoke design and build service for the London private sector. If you’re looking for clever, stunning and energy-efficient construction as well as interior design, we are it. At Done by Tom, we’ve come up with a unique success formula when it comes to memorable design and construction: combining the interior design, architecture and construction process into one seamless dream to deliver according to our clients vision.
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Latest review:
Fireplaces & Flues- 13 Nov 2017
i was so so happy with the service completed by done by tom. I had a really urgent last minute job and they were able to complete all the work to a really high standard and with a great price. I would trust them to do any building work in my house and am happy to have found a trusted builder for future works. Would recommend to anyone
A. plastering
Rating: 5 out of 5
Extension Builder in Barnsbury
Hi. My name is Fatos. I have been in construction for over 17 years. We undertake rendering, plastering and painting jobs. High standard finish in very competitive prices. We also do loft conversion,roofing, plumbing, electric, tiling, extension ect. Our prioritie is to get the job done in very high quality
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Latest review:
Plastering- 22 Oct 2024
We needed to plaster our house ASAP and Fatos completed it in a short time. The house looks amazing, he was quick, efficient and was a great communicator. I would highly recommend him.
CLS INTERIORS LTD
Rating: 5 out of 5
Extension Builder in Barnsbury
We offer a wide range of services in the construction field for both residential and commercial customers, each with unique and tailored demands. top quality finish and with 10 years experience in Tiling, plastering, painting and decorating and all these to a very professional finished job. Very reliable and correct on time. I always care about details at work and thats a work ethic for me. For more quality proof jobs see photos ! We are currently doing some changes on our website at the moment and wont be available to visit for a short period of time. For all quality proof of jobs which we update regularly check our social media platforms Instagram: CLS_INTERIORS_LTD Tiktok: clsinteriors
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Latest review:
Painting & Decorating- 20 Jul 2025
We would highly recommend this company, Silvan work is of a high standard, we required coving installed as well as decorating. He completed the work in the timeframe given, the room was left tidy and will be using them In the future.
CM Building LTD
Rating: 5 out of 5
Extension Builder in Barnsbury
At CM Loft Conversions, we specialise in luxury loft conversions, home extensions, and full refurbishments for both residential and commercial properties across London. Our dedicated team is renowned for transforming spaces with unparalleled craftsmanship and meticulous attention to detail. Whether it’s a high-end home, a modern office, or a commercial property, we deliver projects that elevate both form and function. By seamlessly blending design innovation with practical solutions, we ensure every project not only enhances the aesthetic appeal of a space but also maximises its value and usability. At CM Loft Conversions, we are passionate about creating bespoke spaces that reflect the unique needs of our clients. From concept to completion, we focus on the fine details and provide a smooth, stress-free experience. Whether you’re looking to transform your home, expand your business premises, or refurbish a commercial unit, our team is committed to delivering results that exceed expectations.
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Latest review:
I met Charlie and his team from CM Builders Ltd when they were completing a loft extension and ground floor extension for one of my neighbours. Quotation and budget I was given an estimate subject to drawings as I was on a strict budget that I had to keep to for the build. Charlie was able to help me keep to the budget, both at the final agreed plan and during the build. The project was complex in that whilst it was a loft extension, all of the house was rebuilt. The only thing kept was the external walls and first floor rafters. Whilst the footprint of the first floor was not being changed I wanted to bring it up to current building standards with extra insulation. All of the plumbing and electrics were also replaced including a new boiler. The overall build has come in on budget, save for agreed enhancements that I did not think of at the planning stage and or building regulations such as double ceiling fire plaster boards. There were also items such as the original stairs that I wanted to keep, but Charlie was able to increase the height space in the kitchen making the worktop much more usable for tall people for a larger part of the kitchen. These were suggested to me as potential options as part of the build. Stage payments The stage payments have all been sensible throughout the build and linked to the ongoing work schedule. I have not therefore had any concerns in this regard. Quality of work This was a very complicated build as unlike the ground floor the first and new second floor are “L” shaped. The new 2nd floor included an en-suite and 2 bedrooms. Overall the house has been increased from 2 bedrooms 1 bathroom, to four doubles and 2 bathrooms. The quality of work is excellent and Charlie project manages his team to ensure that they all deliver to a high standard- if it is not done correctlt they do it again, with Charlie spotting any issues. Timeline of build This has generally gone to plan very well. As with any build you have to be realistic as things will happen outside of anyone’s control. When issues have arisen Charlie manages them to a conclusion. Also be realistic if you are having to manage to a tight budget. I had to plan for various stage receipts of cash before I could order the kitchen and bathroom items - make sure you understand how this impacts the build and availability of the work force, recognising that CM Builders have to book kitchen fitters and plumbers. CM Builders are also very helpful in that they have sorted out issues with the brick work of my freestanding garage (nothing to do with the build) and also a neighbour’s wall that could have been dangerous to the public, should it have failed. Conclusion The whole family are very pleased with the outcome and we now have the equivalent of a brand new house that has been built to a very high standard. This has definitely been worth doing both from a valuation perspective and quality of life perspective. I would not hesitate to instruct Charlie and his team again.
PLANNING APP LTD
Rating: 5 out of 5
Extension Builder in Barnsbury
We create architectural drawings. We are specialised in applications for planning permission and building regulations and co-operate with local structural engineers for structural calculations, party wall surveyors and building companies. Our projects include extensions, lofts, garages, house&flat conversions in different councils all around London. If you are thinking of extending, converting, or splitting your property do not hesitate to contact us for a free first consultation & quotation.
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Latest review:
CAD / Drawings- 23 Sep 2020
Marius has been doing a great job and put in an extra effort to ensure we were happy with the outcome. I can not recommend Marius highly enough, especially as he managed to fix an issue with the council that we had from someone else drawings. He was patient and very well prepared. Went an extra mile and gave us different ideas/options. He was flexible with timings and most importantly with price. Had by far the best quote and did an exceptional job.
E Building Services
Rating: 4.7 out of 5
Extension Builder in Barnsbury
Hi Everyone 👋 Please Note: I am New with "My Builder" but I am a very experienced, and on my other websites I have many ratings and all 5 🌟 🌟 🌟 🌟 🌟 I hope I will have the chance to show you what I can do I have a range of experience across the trade, with specialised expertise in the following areas,over 12 years: -in Drylining -in Carpentry - in refurbishing restaurants and houses. -Bathroom renovation -Loft Conversions -House extensions After all that I finally have the team wich we can do jobs form A to Z -Plumbing (gas safe certified) -Electrical (Certified) -Roofs -Groundwork -Gardening -Fencing -Waste removal I'm happy to help across all jobs and answer any questions. Thanks for passing by and I hope to hear from you soon 😊🙏
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Latest review:
Carpentry- 30 Aug 2025
This builder expects you to be able to list every single part of the job that needs doing. If it's not communicated through messaging that you need something doing as part of the job then he won't do it. For example - the partition wall that was put up, was not filled because he said that was not communicated in the messages. I would not know everything that should be done in order for a partition wall to look half completed. It is perfectly clear that this is a common occurrence as he repeatedly mentioned how he always shows people the messages sent back and fourth as proof of what they asked for. Bottom line - if you don't know all the tiny steps included in the job you want done then be expected to not get a full job done. He took off £100 off the agreed price due to my disbelief and disgust but this did not help as I then had to find another builder to complete what should have been completed. How can any builder put up a partition wall and not fill where plaster boards are joined
WOODHOUSE BUILDERS LIMITED
Rating: 4.8 out of 5
Extension Builder in Barnsbury
Welcome to Woodhouse Builders Ltd, we cover all aspects of property maintenance and no job is too small or big for us. If it’s a small decorating job or full property renovation , loft conversion or extension , we are here to help and provide the best services possible . Our success is built on providing the best services and ensuring that all our customers are happy with our services.
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Latest review:
Extensions- 6 Apr 2020
Art & team did a brilliant job in building my rear extension and renovating the whole apartment. Communication was excellent throughout and the job was completed on time and to the agreed budget. The finish throughout was to a high standard. I would definitely work with these guys again and highly recommend. Regards MZ
My Home Services London Ltd
Rating: 5 out of 5
Extension Builder in Barnsbury
My Home Services London Ltd is a professional construction and home improvement company specialising in bathroom and kitchen renovations, house extensions, loft conversions, and full property refurbishments. We also provide expert gas, electrical, electronics, and smart home (domotics) installation and maintenance services. Our team delivers complete, high-quality solutions designed to transform homes by combining functionality, comfort, style, and modern technology. From small upgrades to large-scale renovation and extension projects, we work with a safe, reliable, and professional approach tailored to each client’s needs and vision.
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Latest review:
Handyman- 29 May 2026
Absolutely fantastic service, they did a great job!!! Friendly and professional. I look forward to having them back for more jobs. 100% highly recommend!! Thank you very much!

4.2

Top rated Extension Builders

Our Extension Builders in Barnsbury, are rated 4.2 out of 5 based on 20 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 Barnsbury?

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

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

What are the hourly rates of extension builders in Barnsbury?

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

Find extension builders in Barnsbury with MyBuilder

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

Step 2: Compare different extension builders in Barnsbury

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

Step 3: Hire Barnsbury extension builders with confidence

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

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

What to ask a Barnsbury extension builder before hiring?

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

An extension builder in Barnsbury 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 Barnsbury 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 Barnsbury?

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 Barnsbury 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 Barnsbury 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 Barnsbury

Can an extension builder in Barnsbury help with planning permission?

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

Many Barnsbury 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 Barnsbury help with materials and finishes?

Yes, most extension builders in Barnsbury 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.