Extension Builders in Barnet

Name: Extension Builder
Brand: MyBuilder
SKU: extension-builder
Rating: 4 (17 reviews)

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Some of our top rated extension builders in Barnet

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Space A construction ltd
No reviews yet
Extension Builder in Barnet
I did a lot of job in construction industry in Uk and all my customers happy years after the job have done.
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KH&N CONSTRUCTION LIMITED
Rating: 4.7 out of 5
Extension Builder in Barnet
Welcome to KH&N CONSTRUCTION LIMITED Registered Company No. 13580223 At KH&N Construction, we bring together a team of elite, skilled builders to deliver exceptional residential and commercial property services across the UK. Whether it's everyday home maintenance or a complete "A to Z" property refurbishment, we make your dream project a safe reality. What We Do: Extensions: Rear, Side & Dormer. Conversions & Outbuildings: Garage conversions, modern offices, and summer houses. Roofing Specialists: Expert installation of Gable, Hip, Flat, Mansard, Butterfly, Gambrel, and Shed roofs. The KH&N Advantage: 10% – 25% Material Discounts via our corporate trade suppliers. No Upfront Payments – pay as we progress based on a clear, pre-agreed roadmap. Free Site Visit & Quote with absolutely no obligation.
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Latest review:
Demolition- 25 Oct 2024
Arrived promptly, got on with a very tough job. Very pleasant team, job completed really well
Ioan Hrit
Rating: 5 out of 5
Extension Builder in Barnet
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.
CM Building LTD
Rating: 5 out of 5
Extension Builder in Barnet
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.
H P JONES BRICKWORK LIMITED
Rating: 5 out of 5
Extension Builder in Barnet
With over 15 years experience, H P Jones Brickwork Ltd prides itself on providing a trustworthy and efficient service to the highest standard. We understand having work carried out can be stressful. But whilst providing you with top workmanship throughout your project, our team aim to keep disruption to a minimum. Customer care is paramount in our service and we believe that regular communication with our customers is key to ensuring they are happy with the service provided.
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Latest review:
Harry was a wonderful contractor to use. Polite, friendly, kept us informed on how the work would take and how it was progressing. Extremely professional, I wouldn't hesitate in using him again and recommending him to family and friends.
Alie
No reviews yet
Extension Builder in Barnet
Hi my name is Alie and i specialise in fence work and build work, I have done many projects in the past related to this and I highly recommend contacting me for any work related matters.
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Red Sea Construction Ltd
No reviews yet
Extension Builder in Barnet
Red Sea Construction Ltd stands as a distinguished building company with an extensive 34-year legacy marked by excellence. Our unwavering commitment to professionalism, high standards, and timely, on-budget project completions has been the cornerstone of our success. Our reputation, characterised by outstanding workmanship and meticulous attention to detail, has earned us numerous projects through recommendations and referrals. At Red Sea Construction, we believe in providing a personalised touch to every project, engaging clients from the planning phase to the final completion. What distinguishes Red Sea Construction is our in-house team of skilled tradesmen, ensuring project continuity and allowing us to keep our clients informed at every stage. We understand that effective communication is fundamental to success. Irrespective of the project’s size or nature, Red Sea Construction ensures client collaboration at every step. Clients have the flexibility to bring their plans, and we tailor projects to suit their budget and requirements, whether for commercial or domestic purposes. Our collaborative approach extends to working with Architects, Surveyors, Quantity Surveyors, M&E Engineers, and Interior Designers.
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Gabriel Slavik
No reviews yet
Extension Builder in Barnet
I’m doing building work for last last 23 years. I always try to do precise work, I am happy to help and advise the customer.
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Marble Piece
Rating: 5 out of 5
Extension Builder in Barnet
Welcome everyone. My name is Peter and I am a builder as well as just tiler and stonemasons. Many clients coming back to me over few years. I run company called Marble Piece Ltd dealing with general building, extentions, loft conversions as wel as kitchen or bathrooms renovations. My service will never meet a complain or dissatisfaction. Clients are proud of their refurbishment visions done by my team. We do other bespoke project as Flooring, tiling etc. No job too small or too big for us!
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Latest review:
Piotr's work is really good. I did four or five kitchens with him and I did recommend him to him to another builder friend of mine and they are happy with his work - no complaints. He arrived on time so there were no delays. I too am very pleased with his work and would of course use him again when I have some stone work to be done.
Alchemy Build
Rating: 4.5 out of 5
Extension Builder in Barnet
We specialise in high end refurbishments / renovations but also undertake extension projects (loft, basement, rear, etc). We also do smaller projects of just bathrooms and kitchens. As we have all qualified tradesmen at our disposal we occasionally do more maintenance type work of repairs.
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Latest review:
Restoration & Refurbishment- 26 Jan 2019
Excellent work. Aaron and his team did a great job renovating our flat , including rewiring and laying a new wooden floor. The workmen were very good , professional, thorough ,clean and tidy. We had to live at the property during the work and they made sure they left us comfortable at the end of each day. We are very happy with the result. Aaron was very easy to communicate with and responded quickly to any queries. Ten out of ten guys! Highly recommended
Planix Ltd
Rating: 5 out of 5
Extension Builder in Barnet
Planix limited carry out all aspects of constructor but specialised in loft conversion, extensions, garage conversions and property refurbishment including kitchen and bathroom fitting.
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Latest review:
Conversions - General- 21 Oct 2021
Job done well and good solutions provided when problems were encountered
KBS Construction Services
Rating: 5 out of 5
Extension Builder in Barnet
In our offer we have a wide range of construction services such as: • Extensions • Conversions • Renovations • Kitchens • Bathrooms-Washrooms • Property Maintenance • Handyman Service • Refurbishment • Brick work etc • Specialist Stone, tiling etc. • Painting & Decorating • Window fitting • Architecture Steel Fixing • Under floor Heating and many more
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Latest review:
Restoration & Refurbishment- 8 Jun 2020
Kamil and his tiler have been excellent. He was able to do the work at short notice, he always turned up on time and stuck to his quote. The quality of the work is excellent with special mention of the tiling which would probably win a competition! Kamil remedied minor problems that occurred as the work was in progress ensuring that the completed work was first rate. I will certainly use Kamil again and have no hesitation in recommending him to others.
Nikaj construction LTD
No reviews yet
Extension Builder in Barnet
Welcome to Nikaj Construction! We offer a variety of bespoke construction services tailored to meet your unique needs. Whether looking to renovate your home, extend your living space, or build outbuilding for a home studio or guest area, we have the expertise to bring your vision to life. Contact today for a free and let’s start transforming your space!
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SZG BUILDING LTD
Rating: 5 out of 5
Extension Builder in Barnet
18years of experience in the construction sector. I may only offer you quality services and nothing less, with SZG BUILDING LTD you will not have to worry about anything. I specialise in every stage of the construction process, right from the very beginning till the very end, in other words from FOUNDATION to DECORATION in the blink of an eye. I will be very pleased to show my previous work, it may be the final outcome or different stages of various projects. References may be provided.
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Latest review:
Kitchen Fitting- 20 Jun 2019
Really pleased with Slawek and his team and would defiantly recommend them after seeing a professional kitchen fit job which they did for me. They went extra mile to resolve some design issues during the fit, kept the work area clean and tidy and behaved in friendly, polite manner. Nice, reliable team charging very reasonable prices.
Dizzain Ltd
Rating: 5 out of 5
Extension Builder in Barnet
The multi trader with excellent skills and consistently good in work performance. If you need help with your house project, such as internal structural changes, rear extensions, loft conversions or any other house structural issues, please don't hesitate to contact. Happy to help and discuss suitable solutions regarding structural design, and to comply with building regulations. A fair and good fees.
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Latest review:
We used Andrius recently and were very happy with the service. Inspected our house and spent a lot of time discussing everything in detail. He completed the drawings very quick and communication was good. Good value for money. He even helped amending something later on as needed. Thank you!
Adriana1995
Rating: 3.7 out of 5
Extension Builder in Barnet
We have over 15 years of experience in the carpentry and windows fitting ( wood , PVC & aluminiu ) field and we are a serious and professional team dedicated to every project we undertake. We are fully involved in the execution of each job and pay close attention to every detail to ensure the final result is flawless. We focus on quality, fairness, and meeting agreed deadlines, providing durable solutions and high-class finishes. Our priority is the complete satisfaction of every client and building long-term collaborations based on trust and professionalism. If you would like to see photos of our previous work and receive a fair and accurate price, please do not hesitate to contact us.
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Latest review:
Carpentry- 22 Sep 2026
Unfortunately I hired this guy. Agreed to start work 0800 /0900 he arrived 1300 left at 6pm, communication very poor and defensive. Really pethatic guy to deal with. Looking at the previous review looks like an ongoing issue with work and personality issues. Workwise okish not what I would say professional certainly not worth the money paid, the finishing is very poor leaving gaps. Am now hiring a professional person to fix his poor work, and despite sending him photos of the poor work he has done his response is unprofessional Certainly not recommending or hiring him again. I paid him to get rid of him as he was hanging outside my house and wouldn't leave until I paid.

Top rated Extension Builders

Our Extension Builders in Barnet, are rated 4 out of 5 based on 17 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 Barnet?

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

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

What are the hourly rates of extension builders in Barnet?

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

Find extension builders in Barnet with MyBuilder

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

Step 2: Compare different extension builders in Barnet

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

Step 3: Hire Barnet extension builders with confidence

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

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

What to ask a Barnet extension builder before hiring?

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

An extension builder in Barnet 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 Barnet 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 Barnet?

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 Barnet 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 Barnet 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 Barnet

Can an extension builder in Barnet help with planning permission?

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

Many Barnet 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 Barnet help with materials and finishes?

Yes, most extension builders in Barnet 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.