Extension Builders in Mayfair

Name: Extension Builder
Brand: MyBuilder
SKU: extension-builder
Rating: 4.2 (20 reviews)

Easily find verified Mayfair Extension Builders. Just post your job to get quotes from MyBuilder's Extension Builders in Mayfair.

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 Mayfair

3687 Results

Sort by:

Johan
Rating: 5 out of 5
Extension Builder in Mayfair
Hello to all visitors to my profile. My name is Przemek, I deal with interior renovation, bathroom finishing and kitchen installation. I owe this to my acquired experience. I have been working in UK for 7 years, of which for 1.5 years I was a bathroom and kitchen fitter at the "WICKES" store. I am a precise and aesthetic person. I love order at the workplace and I like seeing a smile on a customer's face.
Get in touch
Latest review:
Tiling- 18 Apr 2026
Przemek did an absolutely brilliant job tiling the bathroom. A top standard finish and it looks fantastic! He is polite, professional, tidy, punctual, and he has a keen eye for detail. I wouldn't hesitate to use him again, highly recommended.
Bogdan Pana
No reviews yet
Extension Builder in Mayfair
TOP QUALITY MAINTENANCE & CONSTRUCTION delivers internal and external works, adapted to our clients’ needs and specifications, providing top quality maintenance, refurbishment and repairs, all work being executed by our skilled and experienced team of technicians.
Get in touch
DNR Maintenance LTD
Rating: 5 out of 5
Extension Builder in Mayfair
Good team with over 40 year's experience within the building industry, No job to small or big. Very affordable from start to finish even when customers move the boundaries of the finishing line of a job requested. We're opened minded to customers goals ambition, comfortable living and progress in life. Any contractors needed to carry out any jobs are specialised at their craft at hand. which always gives customers peace of mind and quality. All works shall be paid at stages of projects.
Get in touch
Latest review:
Waste Clearance- 5 Jul 2026
Quick response and completed the job at very short notice . Friendly, helpful , hard working and efficient for a reasonable price Now in the phone book for the future .
CIF Builders
Rating: 5 out of 5
Extension Builder in Mayfair
We are family run business and have been in the trade since 2001. Our professional team will always give the best they can to achieve optimal results and most important for us are the finishing details and customer satisfaction. We can provide a range of different services from conversions, to extensions, bathroom and kitchen fittings and full restoration.
Get in touch
Latest review:
Extensions- 28 Mar 2021
Amazing work from CIF Builders: John and his team delivered an amazingly looking extension and were a pleasure to work with. I have no doubt I will employ them again!
DMCA Building and Decorating
Rating: 5 out of 5
Extension Builder in Mayfair
We are a family run business with over 25 years experience. We specialise in loft, single and two story extensions and refurbishments. We take pride in our work, making sure the customer comes first when it comes to quality and satisfaction. It is never about how fast one can execute a project but how competent it is carried out.
Get in touch
Latest review:
Extensions- 4 Jul 2017
David and Co Managed to turn things around for us following a previously botched extension by another builder. Davids a really pleasant person to have working for you and has a wealth of knowledge regarding construction. I wouldn't hesitate to hire him again for future works
Mihai Painting
Rating: 5 out of 5
Extension Builder in Mayfair
“I am a reliable and experienced painter and decorator offering high-quality interior and exterior decorating services. I take pride in delivering a clean, precise finish with strong attention to detail on every project, no matter the size. I work efficiently, respect clients’ homes, and always aim to complete work on time and within budget. Customer satisfaction is my priority, and I’m committed to providing a professional, tidy, and trustworthy service from start to finish
Get in touch
Latest review:
Mihail painted our hall and kitchen walls, ceilings and woodwork. He replaced a damp section of ceiling in the hall by cutting it out and fixing a new section of plasterboard, and making a seamless repair. He then sourced the leak from the bathroom shower, sourced identical wall tiles and retiled two sections around the bath. He then resealed with silicon. A plumber had previously advised us to change the entire glass screen. Mihai's repair work was exemplary and the shower is now fully watertight.
ASECO Electrical Solutions
Rating: 5 out of 5
Extension Builder in Mayfair
I'm a qualified and self employed electrician with over 10 years experience in electrical industry. I specialise in all aspects of domestic and commercial installations. With me you will get high quality standard of work and reliable services at competitive price.
Get in touch
Latest review:
Electrical- 29 Apr 2022
Did really great work for a fair price. Will definitely use again. Very informative and he helped get plugs in the right place
Gjat construction ltd.
Rating: 4 out of 5
Extension Builder in Mayfair
We provide high quality services with bathrooms and kitchens to stand out. We supply high standard services at affordable prices. Experts in house, kitchen and bathroom renovations with more than 10 years of experience. Contact us for free estimates.
Get in touch
Latest review:
Bathroom Fitting- 22 Apr 2023
Younger brother Anti was a professional and I would hire again but beware of the elder sibling as his workmanship his poor, here is a list:- 1) the cupboard fitted under the stairs was misaligned and the hinges are loose. Paint job was poorly finished too. 2) cupboard fitted across the boiler was all bent. Anti came and fixed it. 3) varnish across door and skirting boards were done once and therefore have an uneven spread 4) the floorboards did not have enough glue placed in certain areas so it creaks 5) grout in some time are missing 6) really poor sealant work on the bathroom 7) broke my £2000 TV and then hid the evidence. I only found out after placing the furniture back in its place. In contrast Anti did a good job in fitting the radiator. If you can Illicit promises of Anti only completing the job without the older the brother then go for it or else give them a wide berth.
Lazaros
No reviews yet
Extension Builder in Mayfair
I am Lazaros Koto, I have 11 years of experience in construction
Get in touch
LG Construction & Design UK
Rating: 5 out of 5
Extension Builder in Mayfair
LG Construction & Design Uk is a family business in London.We pride ourselves on high quality workmanship and customer satisfaction.We believe in keeping the customer happy and providing them a great service and high quality with competitive price. LG Construction £ Design UK - Building your dream
Get in touch
Latest review:
Extensions- 13 Jun 2020
Carlos and Luzianna did our kitchen extension in 2017 and we were very pleased with the quality of the work they did. We hired them again in 2019 to redo our living room and front garden. Again we were pleased with the result. In both cases we were living in the house during the construction and they did everything they could to be considerate and clean. We would definitely recommend them.
Bluelime planning consultancy LTD
No reviews yet
Extension Builder in Mayfair
Bluelime is an architectural design and build company established in 2007. Initially, we specialized in delivering projects for some of the best-known high street brands, including Specsavers, Starbucks, and Krispy creams. In 2014, we made a strategic shift away from the commercial sector, redirecting our focus toward the residential market. Drawing from our professional expertise in design and project management from the commercial realm, we seamlessly adapted these principles to the residential sector. Over the last decade, Bluelime has achieved remarkable success, securing approval for over 400 planning applications across every borough in London. We’ve completed more than 50 development projects, encompassing new builds, extensions, loft conversions, and refurbishments. Our experience spans a diverse range of properties, from Victorian houses to modern apartments, culminating in a portfolio that stands as a testament to our commitment and expertise.
Get in touch
Global32 Construction Ltd.
Rating: 5 out of 5
Extension Builder in Mayfair
We're a London-based construction company dedicated to delivering projects of all sizes with utmost care. As proud members of the Federation of Master Builders (FMB), our highly skilled and professional team in construction and project management is here for you. Discover a world of construction possibilities with our comprehensive range of services tailored to meet your needs. From envisioning and crafting stunning new builds to revitalizing existing properties through renovations and conversions, we're dedicated to bringing your vision to life. Our expertise extends to interior design and fit-outs, ensuring that every detail reflects your unique style and functionality requirements. We specialise in both residential and commercial projects. Backed by our meticulous project management, you can trust us to deliver on time and within budget. Our consultancy services provide invaluable guidance at every step. Whether it's groundworks, landscaping, or ongoing maintenance, we're here to turn your construction dreams into reality. Beyond residential work, Global 32 Construction also has solid experience in commercial projects. Whether you’re refurbishing an existing space or starting something new, our team can handle both the technical side and day-to-day coordination to keep things running smoothly. We’ve worked on a range of spaces including hair salons, F&B outlets, and other retail units, so we understand the practical needs behind each project, from layout and workflow to compliance and finishing details.
Get in touch
Latest review:
My house was old and its condition was poor. Much were needed to be fix. The original kitchen layout were also inconvenience to my wife. I need to have all these changed under limited time. This builders have a team of specialists on almost every aspect. They gave me variety on the layout design and choose of materials. This saved me money, time and tons of trouble to find difference contractors. The after service and their respond time are very good too. I hope by sharing my happy experience can save your money and trouble to find a good contractor.
Dariusz Zaczkowski
No reviews yet
Extension Builder in Mayfair
Extension Loft conversion Bricklaying Roofing Demolition Porches and Conservatories Kitchen fittings BENCHMARX, HOWDENS and much more Floors, doors, windows, wardrobes, partition walls, shelving, fittings Decking Any aspects of plumbing Bathroom refurbishment Any aspect of electrical work Also interior and exterior decorating, plastering, painting All our work is insured For free estimates
Get in touch
NW London Contracts Ltd
No reviews yet
Extension Builder in Mayfair
Dear valued customer We would like to thank you for shortlisting us and hopefully giving us the opportunity to make your home look beautiful, we have 22 years experience in constructing driveways, patios, refurbishment, extensions and alterations on residential properties across London.
Get in touch
J.C WARD LIMITED
Rating: 5 out of 5
Extension Builder in Mayfair
Hi, we are a family run business based in East London. We specialise in all aspects of construction. We have good tradespeople we work closely with so everything from taking a project out of the ground to all final fix and everything in between. Please get in touch if you require any further information or would just like to get some advice on your project no matter how small it may seem. Thanks, Scott
Get in touch
Latest review:
Handyman- 5 Aug 2020
Scott was extremely helpful, efficient and professional. His communication was excellent and he kept me updated at every stage. A superb job - I am delighted with the work he did. I would thoroughly recommend this company to anyone. Thank you!
Rafa360
Rating: 5 out of 5
Extension Builder in Mayfair
Hello, I'm Rafa360. I'm experiencing digger and dumper driver. I have many years of experience with groundwork, demolition, construction sites. I have private mini digger and many other tools whatsoever you need to do your work. Rafa360 based in Greenford London offering service of Groundwork Mini digger and dumper Digging foundation for extension Digging trenches Demolition Shed removal Wall removal Concrete path, base removal Concreting Shed base Retaining wall Handyman Fencing Driveway Garden cleaners Garden Levelling Tree stump removal And many others Nothing job is too big or to small no hesitate to invite me if you need to do your task with good quality and responsibilities person. Regards Rafa360
Get in touch
Latest review:
Groundwork & Foundations- 13 Feb 2026
Rafa is a good tradesman and worked well. Would hire him again.

4.2

Top rated Extension Builders

Our Extension Builders in Mayfair, are rated 4.2 out of 5 based on 20 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 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.