Extension Builders in Isleworth

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 Isleworth

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john d limited
Rating: 5 out of 5
Extension Builder in Isleworth
Thank you for taking time to look at our profile. We are a company with over 20 years experience in domestic and commercial installations. We are able to help from simple maintenance, fault finding and testing to complex new installations. Customer satisfaction is taken seriously as well as punctuality, neatens and honesty in doing business with our clients.
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Latest review:
Electrical- 14 Jun 2020
Greg, explored all possible solutions whilst keeping the changes to the ascetics as minimal as possible. He talked me through his plans and we booked him in. We are very happy with the work and would definitely call Greg again should I need more electrical work doing.
Reform Build Constructions LTD
Rating: 5 out of 5
Extension Builder in Isleworth
We are a professional construction company with almost 6 years of experience delivering high-quality building and renovation services. Throughout our years in the industry, we have built a strong reputation for reliability, skilled workmanship, and attention to detail, successfully completing projects of all sizes for homeowners and property developers.We specialise in a wide range of construction services, including full house renovations, home extensions, loft conversions, and garage conversions, helping our clients make the most of their existing space while increasing the value and functionality of their homes. We also carry out new build projects, managing each stage with careful planning, clear communication, and high construction standards.In addition to structural work, we offer painting and decoration, exterior rendering, and complete garden remodelling, allowing us to deliver fully finished projects both inside and out. From the initial groundwork to the final touches, every project is completed with professionalism and care.Customer satisfaction is at the heart of everything we do. We work closely with our clients from the first consultation through to project completion, providing honest advice, transparent pricing, an
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Latest review:
We had a full house renovation and loft conversion completed by Reform Build Constructions two years ago, and we’re still extremely happy with the results today. From the start, their team was professional, well-organised, and clear about costs and timelines. They guided us through every stage of the renovation, offering helpful suggestions while making sure our ideas and preferences were always respected. The quality of the workmanship has truly stood the test of time. Everything was finished to a high standard, and two years on, the loft conversion and renovated spaces still look fantastic and function perfectly. The loft has become one of the most used and loved areas of our home. Communication throughout the project was excellent. We were kept informed at every step, and the team was always approachable, punctual, and respectful of our home. They also made sure the site was kept tidy and safe, which made the process much less stressful. Completing such a major project on schedule with lasting quality shows their professionalism and experience. We would confidently recommend Reform Build Constructions to anyone planning a home renovation or loft conversion
NLD Construction LTD
Rating: 5 out of 5
Extension Builder in Isleworth
Hello, we’re NLD Construction LTD - a reliable construction company specialising in extensions, loft conversions, refurbishments and all general construction work. With 25 years of experience, we deliver quality results on time and within budget. Let’s get your project started!
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Latest review:
It has been a pleasure to work with Arbi and the team for my refurbishment. They have a very professional and efficient approach on all matters. The quality and reliability of the work is unmatched. Everything was completed accorded to plan and on time despite my last minute adjustments. I highly recommend the team at NLD.
Kang construction ltd
Rating: 5 out of 5
Extension Builder in Isleworth
We are a family run business who have been trading for the past 20 years. The business was started by our father and now we are continuing. We have been working with our father for the past 14 years. We specialise is loft conversions, building extensions, and renovations, all type of building work.
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Latest review:
Loft Conversion- 18 Mar 2022
Brilliant company, very friendly people, easy to communicate, punctual, high standard work, committed to the scheduled time, honest and competitive prices. I recommend them for friends and family.
Stones the Roofing Specialist
Rating: 5 out of 5
Extension Builder in Isleworth
Hi, I am Matthew, the site director. We are committed to maintaining our 29 year exemplary reputation for having a reliable and sincere company that radiates professionalism. Both management and operatives are highly trained, qualified specialists allowing us to adapt to the modification and addition of advanced techniques. Stones provide a comprehensive range of ROOFING SERVICES, LOFT CONVERSIONS AND EXTENSIONS to our domestic and commercial clients at a vastly competitive rate.
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Latest review:
Roofing (Pitched)- 12 Feb 2017
An excellent job received. Matthew put in a real shift during the day and the work was completed to an excellent standard. After several years and several builders our leaks seem to be repaired. Would highly recommend.
Hammer & Beam Construction Ltd
Rating: 5 out of 5
Extension Builder in Isleworth
Hello to our amazing client. Here is a little bit about our company. We have been in the construction industry for multiple years, 6 years to be exact. We have experience in all areas of construction from fitting a bathroom cabinet to renovating a whole house. We at Hammer & Beam are confident we can complete any task you have for us efficiently and professionally. We always aim to keep all our clients happy, thus, we will always find a solution to any problem you may have or needs require. Therefore, you can hire us and rest assured that the job will be completed to your satisfaction.
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Latest review:
Plumbing- 3 Nov 2025
definitely recommend
SP Builders
Rating: 4.8 out of 5
Extension Builder in Isleworth
Welcome to SP Builders, a family-run builder with over 40 years' experience. Undertaking all aspects of building work, refurbishment, lofts, extensions, paving, guttering, carpentry and plastering etc. We aim to make the process from conception to completion as pleasurable and rewarding as possible. We know how important it is to trust a builder when employing them to work in your home. We endeavour to answer your questions and give you the information you need to make the right decisions.
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Latest review:
Extensions- 16 Sep 2025
Steve and his crew did an amazing job turning my fag-packet designs and downloaded images into a proper, wonderful sound proof garden building, concrete external & rockwool cavity He’s a an old-school builder who does things the right way. His approach and mentality are always “how are we going to do this” rather than “I can’t do this,” I picked Steve on price and previous work. He came in middle price wise and was fair, it’s safe to say it was the right choice. He was left to his own devices, worked through all sorts of weather, and although the job took a little longer than expected because of that, he stuck firmly to his original quote. Although steve didn't know at the time, the garden room was my test for both quality, work ethic and trust, and Steve passed with flying colours. On the back of this, I’ve now commissioned him to build me a two-storey extension. I think I’ll buy him his own coffee machine for that project though! ;-) Thank you, Steve
Mile Kresojevic
Rating: 5 out of 5
Extension Builder in Isleworth
Hi, I am experienced self-employed carpenter with 10 years in various projects, working directly for clients while entrusted for their property. Good English, punctual, trustworthy and a reliable time keeper. Can provide references on request.
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Latest review:
Carpentry- 5 Dec 2017
Mile was prompt in supplying a quote and fitted us in within days. He was tidy in his work, pleasant to deal with and reasonable with his quote, we will use him again should we need any carpentry work.
Refurbishment service gold
Rating: 5 out of 5
Extension Builder in Isleworth
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.
Oleg Yembryk
Rating: 5 out of 5
Extension Builder in Isleworth
I've been working on various domestic & commercial projects for two decades.
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Latest review:
Oleg did an excellent job. Clear cost layout in quote. Was communicative through out the build so no hidden corners were cut. Any changes needed were clearly explained and any alteration easily accommodated. Very helpful with advice when needed. I would use him again and in fact would be my first choice.
We Fix Your House Ltd
Rating: 5 out of 5
Extension Builder in Isleworth
We Fix Your House is a family-run, small team of experienced industry specialists with many happy clients in and around London. We take pride in our work and ensure that our customers are always happy. So whether you're are looking for a little DIY help, or a complete renovation of your property, we're happy to help. You'll be pleasantly surprised by our competitive prices too, and YES, we can work around your budget.
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Latest review:
Plastering- 28 Apr 2019
Great job, very professional
LV Design & Build LTD
Rating: 5 out of 5
Extension Builder in Isleworth
Longview Design & Build specialises in high-end architectural design in London. Our team take pleasure in understanding your vision and then guide you towards completion. We act as a one-stop-shop by providing you with all the tools you need to deliver success. Whether you’re looking to expand or refine your home with a loft conversion, rear or side extension, basement excavation, cellar conversion or a top to bottom refurbishment, we are the actual Design & Build construction company you are looking for. We saw a gap in the market – all construction companies out there were founded from builders – and we thought we could bring our experience as Project Managers, Architects and Structural Engineers in construction. As building designers we thought we could bring in our passion, attention to details, knowledge in new high quality materials and cutting edge technology to achieve high end designs for affordable prices. LongView Renovations specialises in loft conversions, extensions, basements, renovations and new build homes in and around London. Through our experience in both construction and design we are able to better understand our client’s vision & needs and solve any issues along the way even for the more complicated projects
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Latest review:
Have used LV on two occasions and have also recommended them to my neighbours. Great communication and professional throughout the process
mares pro build ltd
Rating: 5 out of 5
Extension Builder in Isleworth
Reliable with good quality finish, very competitive on price, clean and professional workmen fully qualified and insured
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Latest review:
Plastering- 5 Aug 2019
The job was more than a standard plaster job it was a complete refurbishment of the dining room with the new flooring extending into the hallway. Ionut did an amazing job his attention to detail is first rate I have used quite a few builders over the years and I can honestly say Ionut impressed me the most. He is hardworking, meticulous to detail, tidy and goes above and beyond the job that has been agreed. An example of this was him deciding to hide all loose wiring while he was doing the skirting which has made things much more tidy and also doing new flooring and skirting under the stairs without me asking. He wrapped everything in plastic during the job (radiators, doors, light sockets etc) no plasterer I have used before took that much care in protecting things during plastering which as we know is a very messy job. We will be recommending to all our friends and in the future he will be the first contact if we need any more building work. 100 percent recommend his services and thank you Ionut for the job you have done for us
D M Brickwork
Rating: 5 out of 5
Extension Builder in Isleworth
Fully qualified bricklayer with 28 years experience in building trade. Private jobs and sub contract from other builders. Houses, extensions, alterations. Comprehensive brickwork services plus rendering , fencing, drainage, concrete foundations, floors.Painting and decorating General building works.
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Latest review:
Bricklaying- 21 Jun 2025
First rate professional job by a nice guy. Turns up on time and is reliable and fast.
Arisha services ltd
Rating: 5 out of 5
Extension Builder in Isleworth
I am gas safe register by qualification, and undertake most of heating and plumbing jobs. Which can be megaflo, new installation of boilers and repairs. I have skills to lay any type of floorings. I have been in the trade over 6 years and take on extention, conversions of lofts, renovations, bathroom, kitchens, tilling, skimming, painting. I can do decking, polycarbonated sheets, glassfiber roofs, sheds, screeding, concreting. I would cover most of building work.
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Latest review:
Good manners and workmanship I will definitely use your services again Thanks Man
Indepth Construction
Rating: 5 out of 5
Extension Builder in Isleworth
Hi, my name is Daren. I have been in the building trade for 28 years. When I left school I served a 4 year apprenticeship and gained my city and guilds in brickwork working at a structural building company for 15 years. I have been working for myself for the last 13 years. I offer clean, quality work carried out by a qualified tradesman.
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Latest review:
Daren repointed the front of my house - it's transformed the appearance and I'm really pleased with the result. He has a real attention to detail and is passionate about Victorian properties. He completed the work on time and did a thorough tidy up at the end. Overall really pleased and would recommend.

4.2

Top rated Extension Builders

Our Extension Builders in Isleworth, are rated 4.2 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 Isleworth?

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

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

What are the hourly rates of extension builders in Isleworth?

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

Find extension builders in Isleworth with MyBuilder

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

Step 2: Compare different extension builders in Isleworth

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

Step 3: Hire Isleworth extension builders with confidence

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

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

What to ask a Isleworth extension builder before hiring?

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

An extension builder in Isleworth 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 Isleworth 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 Isleworth?

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 Isleworth 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 Isleworth 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 Isleworth

Can an extension builder in Isleworth help with planning permission?

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

Many Isleworth 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 Isleworth help with materials and finishes?

Yes, most extension builders in Isleworth 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.