Extension Builders in Hampstead

Name: Extension Builder
Brand: MyBuilder
SKU: extension-builder
Rating: 4.1 (19 reviews)

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Some of our top rated extension builders in Hampstead

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Timall design& build Ltd
Rating: 5 out of 5
Extension Builder in Hampstead
Timall Undertake all sort of building work including New Build, Refurb, extension, loft conversion.
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Latest review:
I received planning permission for a 3m extension, garage conversion and garden office with a toilet/shower and the architect recommended Timall. We of course carried out all our due diligence before selecting Timall as our builder. I received around 8 final quotes from various legal and reputable builders, and gratefully we chose Timall after checking their previous projects. Timall renovated my townhouse, stripped to brick, repartitioned to be more functional for my family, moved bathrooms, new kitchen etc. The council building control said we needed piling for the 3m extension, and Timall were fantastic to change their plans to carry out other internal work whilst a piling specialist was called in, who Timall also liaised with. The garden office, 3m extension and garage conversion all went well. Parminder the director was very hands-on during the project daily, with his builders on-site daily, honest in his advice, and very experienced in his knowledge of the building industry.
BLG Development LTD
Rating: 5 out of 5
Extension Builder in Hampstead
flat roof. PRG ROOF. painting. rendering. ceiling. tiling. plumbing. flooring. windows. bathrooms.,Exstenshens,loft
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Latest review:
Extensions- 24 May 2024
We asked BLG to complete a different job to the one we advertised as weren't ready to start it. Instead they completed a 2 bedroom flat renovation, including ripping out and installation of kitchen, removing plasterboard walls, making good, painting and decorating and recarpeting/tiling. Their work and professionalism was great but even better was their attitude. They were always quick to find good solutions to problems, were extremely accomodating, informative, hard working and prices were very reasonable - at no point did I feel I was being ripped off or being treated like a mug, which after completing multiple renovations in the past am well aware of. I wouldn't hesitate to recommend them.
365 BUILDING LTD
Rating: 5 out of 5
Extension Builder in Hampstead
At 365 Building, we focus on quality over quantity. With many years of experience across a wide range of construction and carpentry projects, we take pride in delivering work that is done to a high standard, completed on time, and kept clean and tidy throughout. What We Do We offer a full range of building services, including: • Carpentry & woodwork • Kitchens & renovations • Flooring & doors • Roofing • Extensions • General building and property improvements We approach every project with care, precision, and professionalism—whether it’s a small repair or a full home improvement. Why Customers Trust Us Our customers appreciate our attention to detail, respectful working style, and strong workmanship. We aim to make every client happy, and many of our projects come through recommendations from homeowners who value the quality of our work.
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Latest review:
Hard Flooring- 23 Jan 2026
Great and honest work, very quick and flexible. Would 100% recomend
B&CE CONSTRUCTION LTD
Rating: 4.9 out of 5
Extension Builder in Hampstead
I am versatile carpenter with a background in residential, commercial, and municipal construction and remodeling. With a strong foundation in carpentry and woodworking, I have expertise in framing, trim, windows, doors, and siding. I possess in-depth knowledge of the construction process, from material selection and techniques to tools and equipment.
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Latest review:
Carpentry- 14 Apr 2026
Great
PLANNING APP LTD
Rating: 5 out of 5
Extension Builder in Hampstead
We create architectural drawings. We are specialised in applications for planning permission and building regulations and co-operate with local structural engineers for structural calculations, party wall surveyors and building companies. Our projects include extensions, lofts, garages, house&flat conversions in different councils all around London. If you are thinking of extending, converting, or splitting your property do not hesitate to contact us for a free first consultation & quotation.
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Latest review:
CAD / Drawings- 23 Sep 2020
Marius has been doing a great job and put in an extra effort to ensure we were happy with the outcome. I can not recommend Marius highly enough, especially as he managed to fix an issue with the council that we had from someone else drawings. He was patient and very well prepared. Went an extra mile and gave us different ideas/options. He was flexible with timings and most importantly with price. Had by far the best quote and did an exceptional job.
Class Construction
Rating: 5 out of 5
Extension Builder in Hampstead
We are professional reliable multi-skilled tradesman team with more than 30 years of expertise in residential and commercial improvement. We believe in delivering excellent work to our clients. With my team, we cover all types of works, from small repairs to full property refurbishments
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Latest review:
Kitchen Fitting- 31 Jul 2019
Mehmed did a fantastic job on the kitchen and dealt superbly with a couple of complications. Arrived on time and left the site clean. Would highly recommend.
DEMIAN
Rating: 5 out of 5
Extension Builder in Hampstead
Bricklayer 5 years experiences
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Latest review:
Handyman- 17 May 2026
Demian did a great job installing a cat flap in a cavity wall for me. Nice guy, great attention to detail, punctual, covered all areas to stop dust, cleaned up fully afterwards. Really happy with the job, recommended.
CONSTA Construction Limited
Rating: 4.6 out of 5
Extension Builder in Hampstead
CONSTA Ltd - small construction company based in London, and characterises in flexibility to complete various jobs . There is list of different small or awkward completed jobs in our portfolio as well as more significant projects as loft conversions, extensions, full house reconstructions, new build and Passive House construction as well.
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Latest review:
Extensions- 29 Aug 2021
Communicated well at the start with reasonable cost. work was done well but the finishing was not so great as expected. The end cost was very expensive. Charged by the hour, the team were very slow which was upsetting to see me pay for time where they sat around not doing much. Ensure to agree fixed price. Communication after job is poor, double glazing has warranty which now not being able to communicate with kostas having to pay to get things done that should be covered in warranty. Central heating give huge problems. Do not use for big jobs
T.M Construction.ltd
Rating: 5 out of 5
Extension Builder in Hampstead
TM Construction.ltd, established in 2007, is a trusted building company specialising in extensions, loft conversion,refurbishments, and general construction projects. With over 15 years of experience, the company is known for its high-quality workmanship, reliability, and customer-focused approach. From groundwork and structural works to finishing touches, TM Construction delivers complete building solutions on time and within budget.
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Latest review:
Roofing (Pitched)- 6 Mar 2026
Thomas was a pleasure to work with. Polite and accommodating. Would definitely hire him again.
Alpha Projects
Rating: 5 out of 5
Extension Builder in Hampstead
I am a construction professional with a well-rounded background that spans from domestic refurbishments to super-prime residential projects. I began my career working on smaller projects such as bathroom and kitchen refurbishments, loft conversions, and house extensions, gaining hands-on experience in every stage of the build process. Over time, I progressed into managing and delivering high-end and luxury residential refurbishments, where precision, detail, and client expectations are at the highest level. My blend of architectural training and on-site experience allows me to approach projects with both design sensitivity and practical efficiency. I am skilled in budget management, construction programming with Powerproject, and the use of digital tools including Bluebeam, AutoCAD, and Revit to coordinate and deliver work to the highest standards. Whether working on a bespoke renovation or a large-scale development, I am committed to providing quality workmanship and a seamless client experience.
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Latest review:
We are absolutely thrilled with our recent kitchen renovation! The entire process, from start to finish, was incredibly smooth and efficient, issue that did arise were handled efficiently. The workmanship is truly top-notch, with every detail handled with precision and care. The team completed the project within an reasonable time frame and the quality of the final result has completely transformed our home. Thank you again to Umit and his team at Alpha Projects!
Ceca Developments LTD
Rating: 5 out of 5
Extension Builder in Hampstead
Hael Construction Ltd, a proud member of the Federation of master builders, is a trusted construction company based in North London, delivering high-quality building services across the region. We specialise in new builds, extensions, loft conversions, renovations, groundworks, electrical installations, and plumbing. With a skilled team of qualified tradespeople and experienced project managers, we provide a complete service from design to completion. Our focus is on quality workmanship, transparent communication, and delivering projects on time and within budget.
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Latest review:
Extensions- 23 May 2022
Ceca Developments have done an outstanding work on our side and rear extension project, and we would definitely recommend this company. Firstly, they have offered a really competitive quote for the work and have been very transparent and detailed in regards to how long it will take to complete the project. Sebastjan has been a pleasure to deal with and was very helpful during the project, providing honest and useful recommendations and being available every time we needed anything. All the work has been completed to a very high standard and to the agreed timelines. We did not have to worry about anything during the whole project, which made this a very pleasant experience.
London Improvers
Rating: 5 out of 5
Extension Builder in Hampstead
I'm a builder (carpenter) with 15 years of experience in England loft conversions and extensions - all building works. Carpentry and joinery is my main profession. I have a bricklayer, electrician, plumber and others on my team who are happy to help. All works done by us coming with warranty and insurance. Dear potential customers don't waste my time if you have budget below £1000 I don't have time for small jobs.
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Latest review:
Removal of existing kitchen and fit of new kitchen including belfast sink, washing machine, cooker and hood with external extraction, new floor. Vini and the others worked very hard, were very flexible with timings when problems occurred with delivery of items and after completion were available to check or answer any questions we had.
down town building & Maintenance services ltd
Rating: 5 out of 5
Extension Builder in Hampstead
we undertake all type domestic plumbing, Tiling and bathroom and kitchen fitting. we cover all the boroughs of london. our trade men are vastly experienced and hold 12 years experience under their belt.
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AP General Builders
Rating: 5 out of 5
Extension Builder in Hampstead
Our company is based on the belief that our customers' needs are of the utmost importance. Our team is committed to meeting those needs. As a result, a high percentage of our business is from repeat customers and referrals. I would be more than happy to showcase the high quality of work I/we pride our self in and would welcome the opportunity to earn your trust and deliver you the best service in the industry.
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Latest review:
Extensions- 5 Sep 2019
The builders did an incredible job refurbishing my house. For my house I wanted to break the internal wall to create a bigger living room and also for them to refurbish the toilet. In the beginning they’ve set a period when everything will be done and they’ve stuck to it so they are trustworthy. Seeing the progress, I could definitely tell that they were working incredibly hard and I know that they have been working long hours to ensure that they manage to finish it within the timeframe that they’ve set. I would definitely recommend them.
Be-Studio Ltd
Rating: 5 out of 5
Extension Builder in Hampstead
bé-studio is an award-winning interior design practice specializing in contemporary residential and commercial projects. We collaborate with a broad range of professionals to bring diverse projects to life, no matter the size, no matter the scope. Services Provided Architectural Design,Home Renovation, Interior Design, House Extension, Kitchen Design, Garden Design, Living Room Design, Home Extensions, House Plans, Complete Bathroom Renovation, Design & Build
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Latest review:
Bilal and his team designed the plans for the extension of the ground floor of our house. He invested time in understanding our ideas and needs, and translated them into something that is both inspiring and practical. They provided amazing visualizations for us to imagine the final look.I recommend Bilal and his colleagues for a hassle free and highly professional service.
Waven.costruction and development ltd
Rating: 5 out of 5
Extension Builder in Hampstead
20 years experience in all aspects of plastering. Complete refurbishments, extensions and loft conversions.
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Latest review:
Plastering- 21 Jul 2016
Very impressed with John’s work and would highly recommend him. John’s work was very good quality, he recommended practical solutions to problems and had a very positive can do attitude fixing up areas outside of the job I hired him for free of charge. Very happy

4.1

Top rated Extension Builders

Our Extension Builders in Hampstead, are rated 4.1 out of 5 based on 19 reviews from customers like you.

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

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

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

What are the hourly rates of extension builders in Hampstead?

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

Find extension builders in Hampstead with MyBuilder

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

Step 2: Compare different extension builders in Hampstead

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

Step 3: Hire Hampstead extension builders with confidence

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

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

What to ask a Hampstead extension builder before hiring?

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

An extension builder in Hampstead 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 Hampstead 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 Hampstead?

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 Hampstead 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 Hampstead 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 Hampstead

Can an extension builder in Hampstead help with planning permission?

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

Many Hampstead 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 Hampstead help with materials and finishes?

Yes, most extension builders in Hampstead 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.