Extension Builders in Marylebone, West London

Name: Extension Builder
Brand: MyBuilder
SKU: extension-builder
Rating: 4.1 (17 reviews)

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Some of our top rated extension builders in Marylebone, West London

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Horsley Construction ltd.
Rating: 5 out of 5
Extension Builder in Marylebone, West London
We are a small company based in north London specialising in extensions, loft conversions and garden rooms. I have worked in this sector for the last fifteen years and my company has been trading since 2016. We take on a small number of jobs but take them very seriously to get the best outcome. Our aim is to enhance the design during the building process and with clear communication create the absolute best project. Previously all our work has been repeat business and referrals.
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Latest review:
We have known and worked with Joe for the last 6 years. He has recently built a ground floor kitchen extension and created a utility area and downstairs cloakroom for us. His ability to communicate each phase of the build’s requirements is brilliant. His craftsmanship is impressive. He has the ability to turn ideas into reality. Joe is a highly skilled plumber and electrician too which is hugely advantageous. He is professional and easy to have in your home. I can’t recommend Joe highly enough.
Pro Construction London Ltd
No reviews yet
Extension Builder in Marylebone, West London
Pro Construction London is a trusted London-based building company with over two decades of experience delivering high-quality renovations, refurbishments, and property maintenance. We pride ourselves on our professionalism, reliability, and attention to detail, ensuring every project is completed to the highest standard. From full property renovations and loft conversions to bespoke finishes and one-off repairs, we provide a seamless service from start to finish — clear communication, transparent pricing, and a tidy worksite every time. Our reputation is built on satisfied clients who return to us for future projects, knowing they can rely on a skilled and dedicated team to bring their ideas to life.
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UTALE
Rating: 4.7 out of 5
Extension Builder in Marylebone, West London
UTALEE PLASTARING Drylining RENDERING General buildings
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Latest review:
Plastering- 12 Jun 2026
Great communication clear pricing and really good and effecient work. Will use again!
Castle view construction Surrey Ltd
No reviews yet
Extension Builder in Marylebone, West London
Castle view construction Surrey Ltd is a building and refurbishment company delivering high quality construction services across residential and commercial projects. We specialise in full property renovations extensions structural works fit outs and maintenance
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The00company
Rating: 5 out of 5
Extension Builder in Marylebone, West London
Independent family business taking pride on our reputation for a unique combination of workmanship and service regardless of the size of project. My team and I are customer-oriented providing you with quality products built to your exact specifications in the specified time period. We provide a personalised service that involves you in all design and planning.
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Latest review:
Khin and Senh did an amazing job redoing all the skirting in our home. Their quote was competitive and their workmanship outstanding. They helped us source the materials to our specification for a great price, handling all the delivery details and were happy to pick up any bits and bobs to get the job done. Each day they arrived on time and often worked late to accommodate the fact we had carpets coming in the following week. After each day tools and materials were squared away and they would send updates on progress. The final product was top quality and has nicely finished off our home as part of a large book of renovations. Finally any snags that I did notice they were happy to come back and address, I couldn’t have wished for any more from these guys. All the best !
T&S Construction
Rating: 5 out of 5
Extension Builder in Marylebone, West London
Ive been in building work all my life and im very good so people say theres not many builders like me ,try me and i bet you have me back i can show my work .
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Latest review:
Extensions- 2 May 2018
Tom is a very competent builder, who has attention to details. Tom continuously went out of his way to find ways to meet my requirements, Whenever we had atypical challenge during my extension Tom's default position was "let's find a work around." He was creative and efficient in doing so, and most importantly cost effective, as I was running on tight budget. Fantastic experience working with Tom, he estimated the work to complete in 6 weeks, the work was done 5 and a half weeks and handed over. The works speaks of itself, very urban finish with high level of professionalism. I was almost hands off the project due to work travel, and Tom took care of all the aspects without me being involved day to day and micro manage. He is surely being to be big league builder in no time. I would recommend him whole heartedly.
Compact Building Ltd
Rating: 4.8 out of 5
Extension Builder in Marylebone, West London
Compact Building LTD Renovations | Refurbishments | Plumbing – Across London From full home makeovers to small upgrades, we deliver expert results with 0% interest payment options. Make It Compact. Make It Perfect.
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Latest review:
Bathroom Fitting- 21 May 2026
Petru fitted a new shower tray. It was a complicated job due to the location of the piping. Petru was very meticulous and ensured he completed the job correctly and to a high standard.
ALMO Property Group Limited
Rating: 5 out of 5
Extension Builder in Marylebone, West London
ALMO Property Group delivers comprehensive property services, from maintenance and renovations to consultancy and management, with efficiency, expertise, and attention to detail. Backed by experienced professionals and full insurance coverage, we provide a dependable service, clear communication, and consistently high standards on every project, with a focus on providing value for all our clients.
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Latest review:
We recently completed a full house refurbishment including a 4-metre rear extension, dormer loft conversion, and complete interior renovation with ALMO Property Group—and I genuinely couldn’t recommend them more highly. From the very beginning, the team managed everything seamlessly, from planning and design through to execution. What could have been an incredibly stressful process was made smooth, organised, and surprisingly enjoyable thanks to their professionalism, communication, and attention to detail. The quality of workmanship throughout the project has been exceptional. Every stage was handled with care, precision, and a clear commitment to delivering a high-end finish. The team were reliable, efficient, and always kept us informed, which gave us real peace of mind. A special mention has to go to Ameer, who was absolutely outstanding from start to finish. His dedication, responsiveness, and willingness to go above and beyond made a huge difference. He was always on hand to answer questions, offer solutions, and ensure everything ran perfectly. ALMO Property Group have completely transformed our house into a beautiful home, and we are beyond happy with the results. If you’re looking for a trustworthy, skilled, and professional team, I would highly recommend them.
The london Loft and Kitchen Company
Rating: 4.5 out of 5
Extension Builder in Marylebone, West London
We are a southwest London Based loft and kitchen extension specialist. Our working area is very small with 90% of our jobs in Wandsworth and any work outside this area is never more than a mile or two away. With over 15 years experience in this area we know inside and out how these properties were built so when it comes to structural alterations you couldn't be in safer hands.
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Latest review:
Extensions- 16 May 2017
Initially apprehensive about using mybuilder, we found David easy going, clear and concise from the offset. The work carried out was to a high standard and any changes or questions that arose he was all to happy to answer. We found him to be pro-active in his approach, open and honest with how much items cost and sensible when agreeing monthly valuations. Both of us work in the construction industry and it is enjoyable and a breath of fresh air when you get to work with people as straight forward a David. We hope to do work with him again and would be happy to talk with anyone who is considering taking him on for additional work. Many thanks, Rob and Brom
Valentin Tolea
Rating: 5 out of 5
Extension Builder in Marylebone, West London
I describe my self a very serious builder ,with huge experience in a construction field in all sort of jobs that I mentioned below , 5 years in Italy Rome ,7 years in Romania and 4 years of full UK building site and private experience .I would interested in taking over both ,internal and external execution works
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Latest review:
Plastering- 7 Mar 2018
I hired Valentin for our job of removing an arch as well as widening a hatch and then re-plastering. I am so glad I did! He was a courteous and reliable worker. Very flexible with timings and honouring our requests. He was very neat and tidy too. His price were fair and he did a superb job to a high standard. I would hire him again for any job and I would happily recommend him to others.
MNM CONSTRUCT LTD
Rating: 5 out of 5
Extension Builder in Marylebone, West London
The company was set up following years of working on small and large projects for both private and public clients subsequently understanding the continuous increase in demand of manageable, cost effective and quality projects.
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Latest review:
Plastering- 26 Jun 2016
We hired Manu and his team to plaster our summerhouse, relocate two radiators and fit a new bulkhead ceiling in the lounge and install LED tape. He was knowledgable, professional and considerate and I highly recommend Manu and his team. Not only did he understand the project for the bulkhead, but he came up with another suggestion which we went with, and friends and family agree looks amazing. The finish on the plasterwork is perfect and Manu and his team worked hard and even left the summerhouse cleaner than when they started! It is great to work with a team who pay such attention to detail, listen to the client and get the job done to a high standard. It was a risk to go with Manu as he didn't have any feedback when I hired him. I actually got him to quote so I could compare prices with someone else I had in mind to do the job, but when I met Manu I felt he would be the better person to do the job as he listened and understood exactly what I wanted and so I ended up hiring him instead. I wouldn't hesitate to hire him for any future jobs. Thank you Manu and team!
Planix Ltd
Rating: 5 out of 5
Extension Builder in Marylebone, West London
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
Vullcan Construction
Rating: 1 out of 5
Extension Builder in Marylebone, West London
We are a CHAS and Safe Contractor accredited organisation specialising in the provision of bespoke and high end specifications in relation to all aspects of internal refurbishments for both contemporary and period properties, in addition to commercial fit-out works, as well as small to large scale structural alternations. Our clients choose us for our experience and strong level of communication during our projects, our highly competitive rates and the high level of quality of our finish.
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Latest review:
Extensions- 25 Aug 2020
I did my due diligence on Vullcan, but things went downhill. After a week i got a pre-tax invoice for £3000 for a more "complex" drainage system which was already completed, this was the start of them trying to get around contract items and look for every way possible to charge extra fees which i can’t go through in the word limit here. When that dint work they refused to do the work. e.g. they literally installed a tempered glass sheet, with liquid glue on my roof and stated to me that this was a "roof window". I had to show them buildings regulations that this was unacceptable and illegal especially when our contract said it has to be a VELUX ROOF WINDOW! Promised a 6-8 week completion, this is 9 months later. I had now paid about 90% of the original bill and 100% of additional costs. The final payment was due after completion and a 2 week snagging period. But the demand for payments started, with threats to sue. This was laughable as they hadn't completed the job. •The roof was leaking •Electrical issues with the fuse box and multiple light /electrical points •Outstanding items •The buildings controls company stated they would not be able to sign off on the building work because of outstanding issues, which I wouldn’t have even known as they lied stating they HAD the certificate. I agreed to send a FULL payment to an escrow company and pay HALF of the costs so they can complete and fix safety issues but they refused! Shameful experience.
Fk skyline LTD
No reviews yet
Extension Builder in Marylebone, West London
FK Skyline is a London-based construction company specialising in loft conversions, extensions, and full property renovations. We deliver high-quality workmanship, reliable timelines, and clear communication from start to finish. Our team is experienced, professional, and committed to meeting clients’ expectations while maintaining excellent standards of safety and cleanliness. We take pride in providing honest pricing, attention to detail, and customer satisfaction on every project.
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RS building
Rating: 5 out of 5
Extension Builder in Marylebone, West London
We’re a highly professional team with over 20 years’ experience in extensions, loft conversions, high-end renovations, new builds, and property conversions. We deliver top-quality work on time and within budget. Our rates are among the most competitive in the UK at £180 per day per man + 10% OHP. With all specialist trades under one umbrella, we can handle projects of any size smoothly—from £20k up to £2m. Happy to discuss your project further
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Latest review:
RS Building successfully delivered two full back-to-brick refurbishments and a new-build development for us in Greenwich, including demolition and construction of four new dwellings. Their level of workmanship is exceptional, and their attention to detail is second to none. As experienced property developers, we’ve worked with many contractors—but RS Building stand out for their reliability, quality, and professionalism. We have since recommended them to several colleagues, all of whom have been equally impressed. Our only regret is not finding them sooner. We look forward to working with them again on future projects.
FERARU GROUP BUILDERS LTD
Rating: 4.7 out of 5
Extension Builder in Marylebone, West London
I've worked in the UK for 8years now and I do my job to a high standard.
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Latest review:
Extensions- 15 Jun 2024
My advice is avoid. Poor communication Poor workmanship Poor quality finish Create 'issues' during build to make you pay more than quoted Left project incomplete We pursued through the Court and won the case, but of course he is unable to pay, so we are pursing further through the Court. He will respond to the review with some excuse, but there is absoultley no excuse for poor workmanship and quality. Happy to share pictures and videos on request.

4.1

Top rated Extension Builders

Our Extension Builders in Marylebone, West London, are rated 4.1 out of 5 based on 17 reviews from customers like you.

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What types of services are offered by local extension builders in Marylebone, West London?

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 Marylebone, West London 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 Marylebone, West London who are available and interested can respond to your post.

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

What are the hourly rates of extension builders in Marylebone, West London?

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

Find extension builders in Marylebone, West London with MyBuilder

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

Step 2: Compare different extension builders in Marylebone, West London

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

Step 3: Hire Marylebone, West London extension builders with confidence

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

Marylebone, West London extension builders are ready to help. Use MyBuilder today to find the right professional for your home extension.

What to ask a Marylebone, West London extension builder before hiring?

Before hiring an extension builder in Marylebone, West London or extension building company in Marylebone, West London, 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 Marylebone, West London?

An extension builder in Marylebone, West London 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 Marylebone, West London 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 Marylebone, West London?

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 Marylebone, West London 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 Marylebone, West London 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 Marylebone, West London

Can an extension builder in Marylebone, West London help with planning permission?

Yes, many extension builders in Marylebone, West London 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 Marylebone, West London handle everything from design to construction?

Many Marylebone, West London 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 Marylebone, West London help with materials and finishes?

Yes, most extension builders in Marylebone, West London 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.