Extension builders in Mayfair

Name: Extension Builder
Brand: MyBuilder
SKU: extension-builder
Rating: 4.6 (18 reviews)

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Some of our top rated extension builders in Mayfair

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Elgon Construction Limited
Rating: 5 out of 5
Extension Builder in Mayfair
Be assured that your home is in good hands. We have provided building services for 18 years in London. The advantages of the company are a high quality of service and punctuality.
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Latest review:
Painting & Decorating- 17 Nov 2023
From connecting with Elgon to having the job done it was a smooth process. Elgon was professional friendly and put me at ease straight away. Will definitely use them again in future.
Z&V PROPERTIES LIMITED
Rating: 5 out of 5
Extension Builder in Mayfair
I have been working in this industry for 30 years. I have moved to London just about 8years ago. I`v been working as carpenter, builder site and rebuild house is out side and inside as well. Because my English language is not the best i have my little helper my son. Also he is working with me as well. He can take part in the same jobs as me .
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Latest review:
Carpentry- 2 Apr 2025
Zoltan did a great job of fitting my fire doors.
FLYNN properties
Rating: 5 out of 5
Extension Builder in Mayfair
With over 10 years experience and always producing high quality finishes. From kitchens, bathroom to extensions and always with a good positive happy attitude. let us work with you to design and achieve exactly what you’re looking for.
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Latest review:
Tiling- 7 Aug 2023
Paul was great. Easy regular comms. Arrived early on the day and fit me in as best he could. Straight to it, great work, very professional and sorted out some other problems as they were discovered. Talked me through options and did what was asked to a very high finish. Would highly recommend and use again.
Total Interior Solutions
Rating: 5 out of 5
Extension Builder in Mayfair
Are you seeking a team who put your needs first? Then Total Interior Solutions is the team for you. We listen from the outset to what you would like your end result to be and this continues throughout the job which is completed to your complete satisfaction. Our team is ready to help you.
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Latest review:
Bathroom Fitting- 9 Jan 2015
Aggi and Pedro were excellent. They helped me to decide what fixtures and fittings I needed (including also doing some research themselves) and when it came to fitting the new bathroom they did it to a high standard and were tidy/cleaned up after themselves. I would recommend them.
Nenad Jevtic
Rating: 5 out of 5
Extension Builder in Mayfair
I've start working in the building industry 15 years ago. Over the years working in the industry I have moved up the lader and for last 4 years worked as project manager for different building company's . I have vast experience in designing and working on projects to highest standards to meet deadlines and within the budget . I have team of highly experienced tradesman and we always go extra mile to meet customers needs.
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Latest review:
Conversions - General- 6 Feb 2019
Nanad and his team have been wonderful from day one. We have had them with us a number of weeks doing all the jobs they quoted for and more, they are fast efficient and courteous of the fact we lived in for a lot of the work. Everything has been finished to a great standard and we are thrilled with our house which has been completely transformed. We have already recommended them to friends and will continue to do so and hopefully have them back in future. They are creative, solve issues that crop up easily and without fanfare extremely hardworking and all round an excellent team! Thank you for everything! Emma and James
J & M loft conversion ltd
Rating: 5 out of 5
Extension Builder in Mayfair
I’m a skilled landscaper with experience in designing and creating outdoor spaces that are both functional and visually appealing. From turfing and patios to fencing, planting, and garden maintenance, I take pride in delivering high-quality work with attention to detail. My goal is to transform outdoor areas into spaces homeowners can enjoy all year round. Reliable, hardworking, and customer-focused, I ensure every project is completed to the highest standard.
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Latest review:
Fencing- 26 Oct 2026
Fast, efficient, work was clean, would hire again
Hills builders
Rating: 5 out of 5
Extension Builder in Mayfair
Hi I'm Lee a general builder with 25+ years experience, specialising in: * Landscaping * Groundwork’s * Brickwork * Roofing * Carpentry * Extensions/ Refurbishments * Emergency call outs I pride myself on being being highly knowledgeable and reliable, focusing on clear communication from the start to enable projects to be completed exactly what is envisioned by you, on time and within budget. Get in touch for a free no- obligation quote Regards Hill's builders
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Latest review:
Roofing (Flat)- 27 Oct 2026
I would recommend Hills builders, very good priced and kept to his time
studioTO limited
No reviews yet
Extension Builder in Mayfair
We are here to give you confidence to create a home, that is an intuitive reflection of your personality & your lifestyle. Space, that enhances your wellbeing and helps you perform better. If you want to improve your existing house or build a new one, we are here to guide you. WE HAVE YOUR BACK! We embrace our clients as individuals with unique beliefs, characteristics & aspirations. With our assistance you will have better clarity on what you need, want and what can be achieved.
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Haxhi D LTD
Rating: 5 out of 5
Extension Builder in Mayfair
Our company is dedicated to becoming your contractor of choice no matter the service. We pursue excellence. Our dedicated and experienced team deliver quality in a timely fashion. we provide construction services and every job schedule is completed on a “Fast Track” basis with an emphasis on quality workmanship.Our pledge to excellence and customer satisfaction has led to repeat corporate with our clients and has been the cornerstone of our growth.
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Latest review:
Haxhi and his team exceed my expectations. We did agree on a bathroom renovation which basically everything was done from scratch. He was always on time and he met the deadline of the project. I had an issue with my water pump but he managed to fix it for little cost. Also he did the tiles for me on the wall and floor with very minimum waste and he did a brilliant job. We changed the position of the basin in order to save space and we did replace it the washing machine(hidden). We are now working on my other property to renovate the bathroom. Hahxi is very professional, knows the job very well, he did coordinate with me on every step to make sure we are on the same page . I strongly recommend him for any renovation project you may have.
Mansarda Ltd
Rating: 4.9 out of 5
Extension Builder in Mayfair
We are a trusted and experienced building company based in London, specialising in loft conversions, house extensions, home renovations, bespoke furniture, and wood flooring. With many years of experience in the construction industry, we have successfully completed a wide range of projects for homeowners across London, earning a reputation for quality workmanship and excellent customer service. Our skilled team is committed to delivering every project to the highest standards, using quality materials and paying close attention to every detail. We understand that building work can be disruptive, which is why we always treat your home with care and respect, keeping the workspace clean, organised, and safe throughout the project. Whether you’re looking to create more living space with a loft conversion, extend your home, renovate your property, install beautiful hardwood flooring, or have custom-made furniture designed to suit your style, we provide a complete service from start to finish.
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Latest review:
Loft Conversion- 22 Sep 2021
Mansarda completed the work to a very pleasing standard and were reliable and well organised bringing in various specialists as and when required. Mykola was very flexible on making agreed variations to original plans to improve the final build. He is very knowledgeable and skilled in many aspects of the work. I would recommend him to anyone looking for a loft extension.
jawad
Rating: 5 out of 5
Extension Builder in Mayfair
Skilled and dependable worker with experience in wood construction and roof installation. I build and install wooden posts, frames, and plastic or timber roofing. I take pride in delivering strong, clean, and professional results. Friendly, punctual, and committed to customer satisfaction.
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Latest review:
Jawad was very professional and hard working. Our corner has said if he could give 6 stars he would! I reccomend him highly!
Zaman Archihomes Ltd.
New on MyBuilder
Extension Builder in Mayfair
Zaman ArchiHomes Ltd is a CIAT Chartered Architectural practice providing design and project management services for residential and commercial projects across the UK. We help clients develop their ideas into practical, well-considered designs, from extensions and conversions to new homes and commercial spaces. Our services include measured surveys, planning drawings and applications, building regulations drawings, and support through the construction process. We provide a clear, responsive service tailored to each project.
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22g construction limited
Rating: 5 out of 5
Extension Builder in Mayfair
Hi , we are here on this platform to make your dream house into reality , with 20years of experience in all trades and expertise we will make sure you get the best service , so chose us for any kind of construction work . Thanks
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Latest review:
22g construction did my bathroom refurbished they did very good job more than my expectation I am happy to recommend 22 G construction anyone who’s looking refurbishment extension or any other work
Maclondonbuilding
Rating: 4.9 out of 5
Extension Builder in Mayfair
MACLONDONBUILDING specialist in general construction and renovation services. All kind of house conversions . Our works are performed at the highest standard with attention to the details. Professional team always happy and enjoyed of the work.
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Latest review:
Tiling- 16 Jan 2026
Mac was fantastic and went above and beyond to do the job to a high standard, working well into the evening to get it done. I’d recommend him without hesitation for any work you need doing - big or small. We’re delighted with the finished product.
KBL Construction Service Ltd
Rating: 4.7 out of 5
Extension Builder in Mayfair
we have 10+ years of experience and provide high quality of workmanship in every aspect of building services from refurbishments to loft conversion and extension.we are professional team of skilled builders, tillers, bricklayer, carpenter, painter and provide services for plumbing and electric work.
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Latest review:
Extensions- 13 Oct 2023
KBL recently completed a side infill extension for us that involved a lot of complex hurdles (e.g., requiring special foundations because of a Thames Water waste pipe and steel beams). In hindsight, we were very lucky to have hired them because they made the whole experience stress-free by explaining everything to us and handling our neighbours, contractors, structural engineer and building control for us. The amount of digging in confined spaces and hard, physical labour they put into this job is amazing. The extension looks great, is solid, warm and watertight. The wetroom they built inside it hasn't had any problems - plumbing is working great. Their plastering quality is excellent. We had to live in the property during the 4 months of construction but we felt relaxed and 100% trusted KBL to respect and care for the house. They have a lot of experience, know the building regulations, use quality materials and methods, they answered all of our questions with patience and always responded to my phone calls + texts quickly. They're so good that we'll give them an additional job to do which we originally planned for in spring 2024. Everyone we know wants KBL's contact details and we definitely want to ask them back for future work.
UK Crown Developments Ltd
Rating: 3.7 out of 5
Extension Builder in Mayfair
UK Crown has experience of design and build in all types of construction work in central, north and north west London for the last 20 years with exceptional quality finishing, friendly management and supervisors, design team, staff and sub contractors. The client will get benefit of FREE advise for architectural and structural ,mechanical and electrical, including party wall matter from our company and associates.( Subject to contract ) Terms and conditions
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Latest review:
Conversions - General- 28 Jun 2026
Ran off with money.

4.6

Top rated Extension Builders

Our Extension Builders in Mayfair, are rated 4.6 out of 5 based on 18 reviews from customers like you.

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What types of services are offered by local extension builders in Mayfair?

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

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

What are the hourly rates of extension builders in Mayfair?

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

Find extension builders in Mayfair with MyBuilder

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

Step 2: Compare different extension builders in Mayfair

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

Step 3: Hire Mayfair extension builders with confidence

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

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

What to ask a Mayfair extension builder before hiring?

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

An extension builder in Mayfair 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 Mayfair 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 Mayfair?

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 Mayfair 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 Mayfair 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 Mayfair

Can an extension builder in Mayfair help with planning permission?

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

Many Mayfair 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 Mayfair help with materials and finishes?

Yes, most extension builders in Mayfair 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.