Extension builders in Isleworth

Name: Extension Builder
Brand: MyBuilder
SKU: extension-builder
Rating: 4.3 (22 reviews)

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Some of our top rated extension builders in Isleworth

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W5 Construction ltd
Rating: 5 out of 5
Extension Builder in Isleworth
I am Robert Kaminski, and founded W5 Construction Ltd in 2012. My team and I have several decades of experience in construction, and are specialists in helping domestic customers maximise their existing space. We are based in Ealing and cover all areas of West London. We take pride in exceeding our client's expectations, managing your project from start to finish, allowing you to have a stress free experience.
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Latest review:
Restoration & Refurbishment- 6 Aug 2020
Great job done. The guys were very hardworking and the finish is to a very high standard.
Takuski and The Builders Ltd
Rating: 5 out of 5
Extension Builder in Isleworth
"Takuski and The Builders Ltd." is a team of professional construction workers . Our priority is to work safe and to high possible standard.
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Latest review:
Restoration & Refurbishment- 16 Feb 2018
Adam and his team did a brilliant job! My flat was in very bad condition. They gutted the whole flat and refurbished everything to a very high standard. Work performed included, new boiler and radiators installation, complete refit of bathroom and kitchen including all tiling, plumbing and electrics, new spotlights and wooden flooring throughout, new doors and skirting boards and all painting and decorating. They also arranged for all skips and rubbish clearance. I simply left the keys with Adam and he performed all work with minimum guidance. I would touch base a couple of times every week or when things needed to be discussed. He was happy to purchase most materials and provide receipts. I would highly recommend Adam and will definitely use him again for future work.
P&M Property Renovation ltd
Rating: 5 out of 5
Extension Builder in Isleworth
P&M Property Renovation Ltd is the company specialised in house and flat renovations, carpentry, flooring, kitchens, bathrooms, tiling, painting & decorating, loft, and extensions.
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Latest review:
Carpentry- 12 Mar 2022
A fantastic experience, pawel done a fantastic job highly professional and attention to detail ,on time protected all the floors prior to work , lots of helpful advise and at a really competitive price beautiful media wall created all in a day!👍
SHIVAY DEVELOPMENTS LTD
Rating: 5 out of 5
Extension Builder in Isleworth
From Concepts to Creations, Shivay Developments Ltd has combined experience of over 15 years in Construction trade. Our team consist Expert Tradesmen and Experienced Project Managers with a single point of responsibility and accountability throughout the construction process.
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Latest review:
Extensions- 3 Jun 2020
Mohit and his team at Shivay Developments completed extensive improvement work in my house (rear extension, internal structural work, kitchen, toilet, boiler installation, plumbing and electricals, flooring & finishing). The end result exceeded all my expectations in terms of cost, time and quality making me a very happy man. Sharing some pictures would have done proper justice but unfortunately there doesn’t seem to be a way to upload pictures with the feedback. In spite of living inside the property whilst the works were ongoing, we hardly felt any impact owing to how well Mohit had planned the whole thing and the advance notices he used to give us from time to time. All the guys too were very considerate when it came to minimizing the inconvenience all the dust and noise could cause to us and also the neighbours. I also liked the fact that nothing was rushed and a great deal was given to attention for details and the result was just splendid. I guess at the end of the day, it’s what you see that matters most. However amongst everything that hit the right notes for me during the entire process, it was the confidence that I can trust this team to do the job right stood out. It was a bunch of warm and friendly people who had direction and knew what they were doing. A special mention and a big thank you to Kash and Pala to lead the work from the ground up and Mohit for taking up and managing the job and of course for the celebratory rounds of beers :) Do keep in touch
Hydrogen Plumbing and Heating
Rating: 4.9 out of 5
Extension Builder in Isleworth
We are Hydrogen Plumbing and Heating LTD and we ensure to provide the most experienced engineers with a wide range of knowledge within the plumbing and heating industry. We are dedicated to continuously offer impressive services such as general plumbing, general gas and heating repairs, boiler repairs and boiler installations, which includes: underfloor heating, powerflushes, pumps, leaky taps, noisy radiators and air locks. We cover Central, Greater London and Surrey.
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Latest review:
Central Heating- 18 Dec 2021
Fabulous service! Highly recommend. Very communicative and discussed different options until I was completely happy. Will 100% use Karim and team again!!
S.J Shatri Construction Limited
Rating: 5 out of 5
Extension Builder in Isleworth
I believe great service comes from professionalism, attention to detail, and genuine care for customers. I’m dedicated to delivering reliable results, excellent communication, and an experience that leaves clients confident they made the right choice.
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HOAM BUILD LTD
Rating: 3.5 out of 5
Extension Builder in Isleworth
At HOAM BUILD we have a genuine passion for constructing beautiful spaces. We build relationships with our clients and work collaboratively to create a home that you will love and be proud of. We are a female owned, custom home renovation company, driven to deliver quality over quantity which is what sets us apart from volume builders. Quality is embedded in everything we do, it’s habit and because of that, we have built a reputation for attention to detail, innovation and solution focussed thinking for our satisfied customers which has generated a large amount of repeat and referred business. Our core values remain very much embedded in the idea of investing in relationships, listening to our clients and working towards a common goal. Every project is treated with professionalism, dedication, attention to detail and care, with customer satisfaction being our first and ongoing priority. We pride ourselves on working with you as a true construction partner and delivering high quality projects on time and within budget.
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Latest review:
We selected Hoam Build following several quotes from local builders. Deciding factors were their quote was competitive, their general responsiveness and their flexibility. The work was completed within budget and to a high standard. We were so impressed they have now completed three additional pieces of work and a fourth is planned for 2026.
Ava Constructions & Decors
Rating: 4.9 out of 5
Extension Builder in Isleworth
Ava Constructions & Decors Ltd is a UK-based construction and renovation company committed to delivering top-quality craftsmanship and reliable project management. We specialise in full refurbishments, extensions, bathroom and kitchen installations, and commercial fit-outs — always tailored to the client’s vision and delivered to the highest UK building standards. With a keen focus on transparency, timelines, and customer satisfaction, Ava Constructions has earned the trust of homeowners, investors, and developers alike. Punctuality and completion of work on time are a priority .Our team always respect the client wishes and work with them to achieve the best possible results to their satisfaction. Thank you in advance
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Latest review:
Extensions- 16 Apr 2026
I would not recommend this builder based on my experience. Instead of using crushed concrete they used soil to fill the house flooring for underfloor heating. 1 The project suffered from poor communication, repeated delays, and a lack of clarity around responsibilities. There were serious issues with the foundation works, which failed Building Control inspection and now require remedial engineering input before works can proceed. The site was also left incomplete and not in an acceptable condition. Despite substantial payments being made, key documentation, technical responses, and follow-through were lacking, leaving me to resolve major compliance and structural issues independently. My experience has resulted in delay, additional cost, and considerable stress. I would strongly advise others to ensure there is a detailed written contract, clear scope of works, and defined accountability
Expert Maintenance London Ltd
Rating: 5 out of 5
Extension Builder in Isleworth
Expert Maintenance London LTD Keeping Your Home or Business Running Smoothly We fix electrical problems and more across London! Fast & Reliable: Need a repair or want to prevent future issues? We're here to help! Homes & Businesses: We serve both homeowners and business owners. Your Partner in Maintenance: We offer planned and reactive maintenance solutions. Call us today!
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Latest review:
Electrical- 14 Jun 2024
Prompt efficient friendly communication and detailed information resulting in identifying needed work which is planned for next week
Ali
Rating: 5 out of 5
Extension Builder in Isleworth
ALI HAIDAR Plumber | Plumbing & Heating Installer London I have 5 years Experienced and hardworking Plumber with practical experience in domestic plumbing, bathroom installations, heating systems and drainage. Confident working independently or as part of a team, with good attention to detail and a strong commitment to completing work safely and to a high standard. Experienced in installing, repairing and maintaining plumbing systems, including bathrooms, radiators, underfloor heating, kitchens and drainage systems. KEY SKILLS * Full bathroom installation * First Fix & Second Fix plumbing * Toilets, sinks, showers and baths * Taps and mixers * Radiator installation and replacement * Underfloor heating systems * Kitchen plumbing * Hot and cold water systems * Waste pipe installation * Drainage and blocked drains * Leak detection and repairs * Pipework installation and repairs * Copper and plastic pipework * Push-fit fittings * Soldering and plumbing joints * General plumbing maintenance * Working on domestic properties and construction sites * Safe and professional working practices
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Latest review:
Plumbing- 27 Sep 2026
Thanks Ali. Ali fitted a new kitchen sink and tap with all the piping. Good comms. Good quality work. Great guys. Thanks again!
Garry builders
Rating: 3 out of 5
Extension Builder in Isleworth
Hi I am garry I have 9 years experience in building work and I done lot of projects by myself in reasonable cost you can check profile pictures and contact us for quotes
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Latest review:
Painting & Decorating- 13 Jul 2023
Garry done nice work .
MJ Carpentry and Build
Rating: 5 out of 5
Extension Builder in Isleworth
hi i’m matt im a carpenter and builder working on site for 26 years really enjoy it got a eye for detail have to be clean and tidy got a great team of all trades check out my website!
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Latest review:
Carpentry- 1 Dec 2024
Matt and his team did a great job building my Summer House. At every stage they checked that their work was fulfilling my needs, and took on board my suggestions. The whole job was completed within budget and time. I would have no hesitation to engage them again, should the need arise. Thanks Matt.
Top one
Rating: 5 out of 5
Extension Builder in Isleworth
No matter how small or big a job is we will give you the top results
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Latest review:
He completed the job very nicely and most importantly on time. He is experienced guy.
SGB-Slav General Building
Rating: 5 out of 5
Extension Builder in Isleworth
Welcome to the SGB Construction LTD website! I have been in the building trade for just over 20 years. I offer services for all aspects of the home and garden.All work is guaranteed .
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Latest review:
Bathroom Fitting- 14 Nov 2025
The first best experience i honestly had with respect to plumbing services. Slav was punctual and came exactly on the time he comitted. His service was very great and precise and seeing him working made me realise he is very experienced in his work. I will definitely call him for any other work that needs to be done. His price quoted was fair and worth the work.
PBX DESIGN & BUILDS LTD
Rating: 5 out of 5
Extension Builder in Isleworth
Hi, This is shah from PBX DESIGN & BUILDS LTD. We do all types of building works like extension, loft conversion, roofing, plumbing, tiling and landscaping. We can beat any quote.
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Latest review:
Tiling- 11 Jun 2026
Quick and efficient, at a fair price. Highly recommended.
DRS construction
Rating: 5 out of 5
Extension Builder in Isleworth
we are builders who construct the dreams of others. we have the experiece as cscs skill worker about 5 years now doing our own work contact us if you want to get good work experience
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Latest review:
Plastering- 23 Sep 2025
These guys are superb. Came to look at the job, quote & arrange a start date. Friendly and polite at all times. Knowledgeable about best techniques to use. Arrived early, worked till late to get the job done in good time and to great standard. Kept to their quoted price. Highly recommend

4.3

Top rated Extension Builders

Our Extension Builders in Isleworth, are rated 4.3 out of 5 based on 22 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.