Extension builders in Marylebone, West London

Name: Extension Builder
Brand: MyBuilder
SKU: extension-builder
Rating: 4.3 (18 reviews)

Easily find verified Marylebone, West London Extension Builders. Just post your job to get quotes from MyBuilder's Extension Builders in Marylebone, West London.

Select a service

How it works

Post your job for free

Tell us about your job, and we’ll alert suitable tradespeople in your area. It’s simple and free.

Tradespeople respond

Once your job is posted, you’ll get responses from interested tradespeople through the website.

Review profiles and choose

Browse profiles, work history, and feedback, then choose who you wish to share your details with.

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

3761 Results

Sort by:

ADJ Builders Limited
Rating: 5 out of 5
Extension Builder in Marylebone, West London
Hello ..my name is Alfred. I, have over 12 years of experience in building site. Perfectionist in my work and ability to guarantee customer satisfaction. Hard working and ensures all deadlines and targets are met. A good eye for detail, precise and accurate at all times and will complete all work to the highest standards.My experience shows in the finish, with no visible streaks. Polite friendly and helpful.
Get in touch
Latest review:
Painting & Decorating- 6 Oct 2022
Very pleased with our choice. We initially got four quotes from different builders, most of them were terrible at communicating apart from Alfred. He was very easy to work with, responsive and very careful with our brand new house. His team was hard working, tidy and fast. They completely renovated our garden from removal of old decking and gravel to setting up new fences, levelling and turfing the ground. They also removed our old kitchen, partition wall and carpet, as well as did jobs like plastering, building a wall and set up lights and shelves. We’ll surely have him back soon to work on other jobs.
KG BUILD
Rating: 5 out of 5
Extension Builder in Marylebone, West London
With your specifications and our expertise, we happily take on any building work and produce excellent results. Extensions, Loft conversions, kitchens, bathrooms, garden rooms/studios/outbuildings, roofing, flooring, carpentry and joinery etc
Get in touch
Latest review:
Carpentry- 13 Dec 2025
Kwame did a great job and was thoughtful, communicative and very skilled with the work he was carrying out on our joists. I would recommend KG build to anyone looking for a good price and a high standard of work.
Samul Construction LTD
Rating: 5 out of 5
Extension Builder in Marylebone, West London
Estimate Prices From: * Loft Conversion £50k(labour+materials+scaffolding) * Home Extensions £3-4k per square metre * Basement £3-8k per square meter (labour+materials). * Bathroom refurbishment £8k (labour).
Get in touch
Latest review:
Demolition- 18 Oct 2011
Thank you very much - good job and good service. A real help!
Loyalty Construction Ltd
Rating: 5 out of 5
Extension Builder in Marylebone, West London
New to this platform, but backed by over 20 years of construction experience. At Loyalty Construction, we combine extensive industry knowledge with quality workmanship, honest communication and reliable service. From refurbishments and renovations to general building works, every project is completed with care, professionalism and attention to detail. To introduce ourselves to the platform and give our first customers the opportunity to experience the quality of our work, we are offering 10% off to our first clients. We look forward to earning your trust, delivering excellent results and building a strong reputation through genuine customer reviews.
Get in touch
Latest review:
Rodrigo and team at Loyalty renovated our house, fixing lots of minor issues across the house from wear and tear. They were very flexible and did a great job across the whole house inside and outside. We have had lots of compliments since they did the work of how well the house is presented.
CDW building services
Rating: 5 out of 5
Extension Builder in Marylebone, West London
I as the manager have been personally working for a family run business for ten years+ as a multi skilled trader covering all aspects of the building industry which includes: Carpentry Bricklaying Bathroom refits Kitchen refits Extensions Plastering Plumbing Electrics My business is very reliable as all work is carried out to a high standard and is thoroughly checked.
Get in touch
Latest review:
Plastering- 29 Apr 2026
Quality job done in just a few days. Definitely recommend this company.
Adam Favor
Rating: 4.8 out of 5
Extension Builder in Marylebone, West London
Our business was founded to offer clients the opportunity to bring a vision to life. As a design & build business we can take your dream home concept and turn it into reality. We will provide you with design plans for your projects and thorough project management. We also have the professional, experienced and quality tradesmen that are essential to complete the construction phase of the project.
Get in touch
Latest review:
Plastering- 17 Jun 2024
Adam Favor and NOVA Design & Build are a nice bunch of guys and they are reliable/helpful. However, when it came to coving, architrave and flooring, acceptable standards were unfortunately not met. Other specialists had to be brought in to re-do around 20% of the job; namely certain sections of the cornice and door architrave. In the former, a few things were below standard including: 1) not joining the friezes in the correct places, 2) cutting inaccurately, 3) leaving gaps, 4) using silicon as a filler and adhesive. For the door architrave, the wood was misaligned and not glued/nailed properly. The flooring was not laid well because there are huge gaps at times; sometimes at 1 cm. Since the kitchen has been installed, it is too late to take up the floorboards again. The most dubious thing of all in this job was the quote received for decorating which was c. 15k for 47 m2. This included plastering repairs, but ultimately the job got done by someone else to a high standard at 7k.
Constructum Code Ltd
Rating: 4.2 out of 5
Extension Builder in Marylebone, West London
****** Constructum Code building company ****** Constructum Code is a London construction company specialising in high-quality house extensions, loft conversions and commercial builds for private and business clients. As main contractors, we work with architects and interior designers to deliver projects through to final handover. Our focus is on build quality, precise execution and attention to detail. WE OFFER: *10 Year Guarantee* *Free Estimates* *Full Building Control Approved Installer* *Fully insured building service* Services Provided: Basement Conversion, Custom Build Homes, Home Renovation, House Extensions, Loft Conversion, Loft Restoration, New Home Build, Project Management, Concrete Construction, Concrete Repair
Get in touch
Latest review:
I ordered repairs from the Constructum Code company, I wanted to create a play area. The guys tried to select all the materials and work technologies to suit my budget. The tiles on the walls and floor were laid well. The work was completed efficiently and on time. I recommend this company...
MB Healthy Design Ltd
Rating: 5 out of 5
Extension Builder in Marylebone, West London
* 3D Design * Bespoke Furniture * Kitchen/Bathroom Cabinets * Fencing * Shopfitting We provide high quality services with affordable prices.
Get in touch
Latest review:
The price was very reasonable for the quality of work he delivered. He used high quality materials and tools, and did not cut any corners. I am satisfied with the final product.
Dimitrios Spanos
Rating: 3.7 out of 5
Extension Builder in Marylebone, West London
KDG Building & Consulting Services is specialist in all aspects of general building and property maintenance, extensions, loft conversions, structural waterproofing and painting and decorating related works for both private and commercial Clients in Central and Greater London. We take pride in our bespoke building services and make sure every project is nothing less than what our Clients will expect, driven by our values to deliver long lasting and high standards results.
Get in touch
Latest review:
Tiling- 28 May 2020
Did not arrive to complete the job or have the professionalism to cancel in advance. Unreliable company.
Shpetim troka
Rating: 5 out of 5
Extension Builder in Marylebone, West London
Troka Construction specializes in home refurbishments, extensions, and a wide range of home improvements. With a focus on quality craftsmanship and personalized service, we bring our clients' visions to life with dedication and attention to detail.
Get in touch
Latest review:
Carpentry- 30 Apr 2026
Great communication and was able to come and do the job quickly after first message. Job was completed to a great standard (skirting boards and some scotia)
Livinroom Developers Ltd
Rating: 5 out of 5
Extension Builder in Marylebone, West London
Our expertise lies in project management of loft conversion and kitchen extension which is carefully coordinated to ensure a seamless and integrated package service from start to finish. Our role is to be the single point of responsibility taking the burden off the client. This includes managing what are often complex building processes from inception through to completion and hand over.
Get in touch
Latest review:
I recently completed the building of an orangery extension (with skylight) to my semi-detached townhouse in NW London. The extension was to be used as a new kitchen while the existing kitchen converted to a living room. I awarded the contract of building the extension to Anthony and I was pleasantly impressed with the quality of work delivered. Anthony Project Managed the entire process from beginning to end and ensured that all my expectations were surpassed. His hands-on attitude to every detail of the work was quite reassuring. I am glad to say that Anthony and his team are very good professionals and they delivered the project on time and within budget, even going over and beyond the original scope of works in order to ensure that all my latter requests were addressed appropriately.
Towergate Design
Rating: 5 out of 5
Extension Builder in Marylebone, West London
Towergate Design Studio is a London-based leading practice working in the residential and commercial sector. We have a reliable and excellent painting team with reputation for high-quality work, attention to detail, professionalism, including punctuality, clean communication and using quality materials. We are the A turnkey company provides a service from design to the final, fully functional and innovative building projects . We handle all aspects of a project, including design, engineering, procurement, construction, and installation.
Get in touch
Latest review:
Painting & Decorating- 8 Jan 2026
Great job done - Bulent was quick to communicate and efficient in getting everything finished. He was careful to ensure a high standard of finish and I am very happy with the result. He even did extra bits like sealing our bathtub on top of the painting requested.
A abrahim
Rating: 5 out of 5
Extension Builder in Marylebone, West London
Im professional bricklayer with 12 year experience I work with the companies and I work with my own the 12 years I can do all design brick and block
Get in touch
Latest review:
Bricklaying- 23 Aug 2026
Absolutely excellent, a real pleasure to deal with and a delivered a high standard of work exactly as agreed - well recommended.
S & S Builders
Rating: 5 out of 5
Extension Builder in Marylebone, West London
Hi my name is Stephen and I have 30 years building experience specialising in extensions and loft conversions I do 1 job at a time and I am on site every day. I have extensive knowledge of structural engineering I also carry building insurance .and i am a member of the National federation of builders.
Get in touch
Latest review:
Extensions- 18 Jun 2025
Steve and his team were excellent throughout. Turned up on time every day, very reliable. Excellent attention to detail and great pride in their work. All areas of building work undertaken to a very professional standard. We had new bathroom fitted, new fence and handmade shed, lean-to rebuilt from scratch with new roof, patio doors, new flooring, plastering, outside patio. Very happy with the work. Good value for money. Highly recommended would use again without hesitation.
pmlarc
Rating: 5 out of 5
Extension Builder in Marylebone, West London
We are RIBA registered architects with a wide range of experience of over 25 years within architecture, design and construction. We are experienced at new builds, full refurbishments, extensions and conversions, and have completed numerous residential and commercial projects in London and beyond.
Get in touch
Latest review:
Architecture- 13 Apr 2015
We are extremely happy we chose to use Phil for our loft and extension design. Phil is professional, extremely accommodating and a pleasure to work with. He was always contactable, punctual and happy to spend a lot of time with us to discuss designs and the planning process. His design ideas were smart and he presented us with a number of workable options. We wouldn’t hesitate recommend Phil and would certainly use again for any architectural works.
Ebla contractors Ltd
Rating: 3.7 out of 5
Extension Builder in Marylebone, West London
Ebla contractors, I am a Chartered Approved Safe Contractor, I have been working in the building trade for over 20 years, I can undertake any job, from Foundations all the way up to the Roof, and anything in between, I can provide any references and I have insurance of £5 million, my work is second to none, and the proof of that is you don't pay anything upfront, till you are fully satisfied with the quality of work.
Get in touch
Latest review:
Extensions- 29 Sep 2026
I instructed ELBA (managed by Ramon) for a full property refurbishment commencing in August 2025. The sub-contracted team led by Ali abandoned the project two months past the agreed deadline, leaving the property unfinished—specifically the kitchen and bathroom. Over a three-week period, more than 40 calls and messages went unanswered. Ultimately, I had to retain and fund another contractor to bring the property to a habitable state. Three months post-completion, a wall leak emerged in the neighboring property—an issue that had never occurred prior to this refurbishment. My attempts to report this to Ramon in January 2026 were met with total avoidance. the leak recurred on September 22nd. Once again, all attempts to engage with Ramon have been ignored. I retain complete timestamped correspondence, and progress photographs.Having exhausted all standard avenues of resolution, I am currently formalizing the evidence dossier to initiate legal proceedings against ELBA and Ramon.

4.3

Top rated Extension Builders

Our Extension Builders in Marylebone, West London, are rated 4.3 out of 5 based on 18 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 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.