Extension builders in Isleworth

Name: Extension Builder
Brand: MyBuilder
SKU: extension-builder
Rating: 4.3 (23 reviews)

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Some of our top rated extension builders in Isleworth

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RT Build
Rating: 5 out of 5
Extension Builder in Isleworth
We are a family run small company with 20 years on the market.We specialize in bathroom ,kitchen and general building refurbishments.We offer high quality service for a reasonable price with great attention to details. Your satisfaction is our top priority.We are looking forward to doing new project with you.
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Latest review:
Bathroom Fitting- 27 Dec 2025
Rafal did everything as expected. Many thanks for his commitment and professionalism.
Cadessa Ltd
No reviews yet
Extension Builder in Isleworth
Cadessa Ltd specialises in domestic and commercial extensions, refurbishments and property alterations. We work closely with homeowners, landlords, businesses and commercial clients to improve, modernise and add value to their properties. Our services include: * Domestic and commercial extensions * Full and partial refurbishments * Internal alterations * Property improvements * General building work We provide clear communication throughout every project and aim to complete each job to a high standard, with a tidy, reliable and professional approach. Contact us to discuss your project and arrange a quotation. www.meath.group
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Vali colour
Rating: 5 out of 5
Extension Builder in Isleworth
Hello my name is Vali , I have been working in the construction industry 20+ years in this time I have run a small business in Italy ,built houses in Romanian and I am currently working in London as a bricklayer .
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Latest review:
Bricklaying- 1 Oct 2019
Excellent work on budget and time
Zamir Merko
Rating: 5 out of 5
Extension Builder in Isleworth
Hello my name is Zamir, I have over 20 years experience in the building trade. When I complete a job I like to leave the customer very happy.
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Latest review:
I was very happy with the finished job He was very good and made sure that it was done properly. He came in 1 day to quote me and started the next day and finnished in 2 days
Boundary builders
No reviews yet
Extension Builder in Isleworth
Family run company specializing in making more space extensions, loft conversions, out buildings,new builds. we can take the stress out of building for you from the start to finish with setting out architecture drawings building control structure build and interior ..
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Ndreu builders
Rating: 5 out of 5
Extension Builder in Isleworth
Hello,I have 23 years working in construction. I am specialised experience within painting and decorating. I also complete domestic and commercial property refurbishments, silicon rendering, driveway and patio installations, plastering and gardening. I mostly take on all kinds of multi trade work. Please don’t hesitate to contact me for any enquiries.
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Latest review:
Handyman- 20 May 2026
He’s friendly and completes the job with care.
Douglas carpentry and building
Rating: 4.9 out of 5
Extension Builder in Isleworth
Douglas carpentry and building has over 10 years experience in all aspects of building work. We as a company have very high standards to accommodate all your building work needs from internal doors, skirting, architraves, built in wardrobes to all general building work. Hard working, dedicated, reliable, clean and tidy and here to give you a fair and honest quote. Please look at previous work on my Instagram page @douglascarpentry23
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Latest review:
Carpentry- 14 May 2026
Replaced a rotten external single door. The existing door frame was reused, as per request. This frame wasn't perfectly square which Alex had to compensate for. Alex arrived on time and completed the work without any unresolved issues, taking all offcuts and old door away for disposal.
Nero Building Work LTD
Rating: 5 out of 5
Extension Builder in Isleworth
Our team is highly professional within the building trade.We have the ability to manage projects of all sizes and complexities. We are very dedicated to each project ensuring that it is completed at the highest standards within the timescale and the budget allocated. We are specialised: •new build/ houses • Extensions • Refurbishments • Loft Conversions
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Latest review:
Extensions- 1 Mar 2021
Work completed to the highest quality. Real eye for detail and very reliable. Best decision I took was to work with Nezir on this project. Completed in a timely manner and perfect communication throughout. Fairly priced and knowledgeable in all aspects of renovation and construction, adding real value to my property.
SURREY HILLS EXTEND AND RENOVATE LIMITED
Rating: 4 out of 5
Extension Builder in Isleworth
At Surrey Hills Extend & Renovate we promise Quality and Craftsmanship. We take pride in delivering superior quality in every detail of our work, ensuring long-lasting and visually appealing results. We have a Customer-Centric Approach and your satisfaction is our top priority. We work closely with you, understanding your needs and preferences, to create spaces that truly reflect your vision.
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Latest review:
Conservatories- 17 Feb 2025
If I could give 0! Surrey Hills Extend and Renovate Limited is a company which is a scammer. Thye have scammed 80 Plus people. Do not use them. Now thye have declined to start workk and the Directors are going for Voluntary Liquidation after taking away millions. MyBuilder should have vetted the company before putting on their site
A Davies Carpentry & Joinery LTD
Rating: 5 out of 5
Extension Builder in Isleworth
A Davies Carpentry & Joinery LTD is an established carpentry company, specialising in extensions and full refurbishments along with all aspects of carpentry and joinery. The array of skilled tradesmen employed by my business and trusted subcontractors in whom I have worked closely with over 14 + years, I complete every contract to the highest standard possible. Along with honesty and communication I work closely with my clients to ensure the most important task, customer satisfaction.
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Latest review:
Joinery & Cabinet Making- 23 Aug 2019
Can’t recommend Alex highly enough! He built wardrobes into our attic eaves, altered some stairs, and fitted our new wooden hallway flooring, all to an exceptional standard and at a very reasonable price. He was professional, tidy, efficient and consulted me every step of the way to ensure the finished design was exactly what I was after. I’ve already asked him about doing some future jobs I was that impressed.
shalom property development ltd
Rating: 5 out of 5
Extension Builder in Isleworth
Shalom Property Development ltd is a small construction company based in the Croydon area. We specialize in property refurbishment, house extensions, loft conversions, garage conversions, etc. We also undertake projects like plastering, painting/decorating, electricity, plumbing, tiling, flooring(laminate, wood, bamboo), bricklaying.
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Latest review:
Plastering- 6 May 2025
Amazing guys. Hardworking, tidy, professional. They worked in our house for 3 months and we were super happy with the work and everything. We invited them to do more work later on. 100% probably the most sincere and trustworthy builders we met. Only them. No one else from now on.
MFI Construction
Rating: 5 out of 5
Extension Builder in Isleworth
MFI Construction is more than a building contractor. We are a company with high values to take pride in having a "can do" attitude and in offering superb customer service and support. Large enough to provide a reliable and good value service, but small enough to give you the personal touch you deserve, our skills cover the whole building sector- everything from odd jobs and maintenance to full refurbishments and conversions. Specialised in completely transforming old kitchens , bathrooms , doors and furnitures by fitting to the existing surfaces laminate paper of multiple designs to choose from , all chances are that you don’t need to spend the time and money removing existing kitchen , doors and furnitures , they can be repaired and given a completely new look much cheaper than replacing and much more good looking and solid , works come with 15 years warranty and the units are custom made to fit any space . Same applies for tiled areas like kitchen splash backs and bathrooms where we fitting acrilic self adhesive tiles on top of existing tiles , again lots of options to choose from , ideal for rented places as they very easy to maintain or replace . Polishing existing glass shower screens until they look like new , cutting the cost of replacing , same for the frames . We also painting in a variety of colours existing mixer taps , shower trays and bath tubs , sinks and toilets skipping the cost and hassle of getting new . Should you decide to replace kitchen or furnitures , we can build tailored furniture made out of 100 % reclaimed wood , shred the waste and recicle it , keeping costs down and lowering the carbon footprint print . Most walls and ceiling can be wallpapered instead of repairing , plastering and painted , this is a great alternative of preserving existing lath and plaster if that’s the case . Talk to use before getting into a expensive and lengthy refurbishment.
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Latest review:
Carpentry- 1 Oct 2026
Florin did an excellent job repairing our very rotten white double doors. Instead of replacing them completely, which would have been very expensive, he made new wood panelling which provided a really effective repair and looks great. He was easy to work with, fairly priced and communicated well throughout. He clearly cared about doing a good job and finished everything to a high standard. We’re very pleased with the result and would highly recommend Florin.
Chris&Sons
Rating: 5 out of 5
Extension Builder in Isleworth
We are Chris&Sons. We are a father son self employed company looking to shape the future of houses and give our client the best work they can receive as everyone deserves the best. We know all main trades and therefore can be called to any job as we know how to do it, we operate in slough but can accommodate to a further clients needs and travel far. We have 30 years of working experience in the trade and have been recommended by numerous clients and have had a very high satisfaction rate.
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Latest review:
Bathroom Fitting- 16 May 2025
Very happy with the work done. Would recommend.
Santophy Street Limited
No reviews yet
Extension Builder in Isleworth
Santophy Street Limited offer a professional and comprehensive development service, tailored to suit the construction and logistical challenges that each individual project offers. Having delivered some of most complex commercial and residential projects in London over a combined 23 years, Santophy Streets Director's, Adom Calliste and Chris Doel, work as a team to ensure that all legal and construction risks are identified and mitigated to ensure maximum value is extracted for our clients.
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B&G Brothers Construction Ltd
Rating: 4.8 out of 5
Extension Builder in Isleworth
WELCOME TO B&G BROTHERS CONSTRUCTION LTD B&G Brothers Construction Ltd is a well-established building company based in Stanmore North West London. We carry out most types of building works, including: House Extensions Property Refurbishments Loft Conversions Ground Works And all type of repairs and alterations. You can be confident in our abilities to create you that perfect home using the highest quality of materials and best possible level of workmanship
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Latest review:
Extensions- 11 Jan 2023
Rear garden extension done with new fully refurbished old house new electric new plumbing, all work done properly and good quality, experienced builders , +++ big job done within time frame and olso garden levelling with retaining wall ! Andrei and Alex recommend!
10/ten construction ltd
Rating: 5 out of 5
Extension Builder in Isleworth
Hi I am Landi, 33 years old, I’m in construction industry over 15 years. Build your future with us! We are constantly developing our skills and expanding the knowledge, so as to provide you with modern and effective services. Our team is always up-to-date with all the most important novelties in the field, what makes it possible for us to apply innovative techniques and use professional tools. Thanks to that, we can perform complete refurbishment perfectly. If you choose us to be your building contractors, you can be certain that every project will be precisely planned and carried out. 10/TEN CONSTRUCTION LTD
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Latest review:
Carpentry- 6 Dec 2024
We recently had Landi around to quote on a number of jobs we needed doing around our house. We booked him to fix our roof, which was leaking water - he and his team did an absolutely fantastic job. They were responsive, thorough and did a great job. We won't hesitate to recommend him to anyone and get him back for any work we need doing.

4.3

Top rated Extension Builders

Our Extension Builders in Isleworth, are rated 4.3 out of 5 based on 23 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.