Extension Builders in South Kensington

Name: Extension Builder
Brand: MyBuilder
SKU: extension-builder
Rating: 4.2 (19 reviews)

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Some of our top rated extension builders in South Kensington

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Greenfield Building Solutions Limited
Rating: 5 out of 5
Extension Builder in South Kensington
Greenfield Building Solutions is a versatile building contractor offering a comprehensive range of services across residential construction and renovation. From full refurbishments and loft conversions to bespoke house extensions, they handle every aspect of the building process with precision and care. Known for their commitment to quality craftsmanship and client satisfaction, Greenfield Building Solutions works closely with homeowners to transform spaces—whether it’s modernising interiors, expanding living areas, or reimagining unused lofts into functional rooms. Their team brings expertise, reliability, and a tailored approach to each project, making them a trusted choice for turning property dreams into reality.
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Latest review:
Extensions- 6 May 2026
Mark & Max built a custom summer house/garden office for us to our exact specification and within budget. . The work included clearing & preparing the area, erecting and insulating the space, cladding the exterior walls and sealing the roof, installing uPVC doors, plus electrical and data connectivity. . It was all done without fuss or hassle, and at a high standard. Mark & Max were a pleasure to communicate and work with, would 100% hire them again. . Further references & a viewing of their finished work available by appointment
Actonstruction
Rating: 4.1 out of 5
Extension Builder in South Kensington
Actonstruction as one of the premier builders in London carries out all aspects of building work including extensions, loft conversions, renovations, roofing, joinery and much more. We are focused on providing high-quality service and customer satisfaction.
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Latest review:
Extensions- 2 Mar 2017
I used the firm's services to build an extension. Darek himself seems to be a hardworking and reliable individual. Problem is - he surrounded himself by some not very professional people, including close family members, who make things much worse for him. The other problem was that most of his team members do not seem to have much loyalty to the firm and are ready to jump to a different job any time. We had a terrible delays with our project and some things we had to completely re-do using 3rd party services. If you can ensure Darek is 100% committed to your job - could be a good project, if not - please await problems (just like I had)...
J.C WARD LIMITED
Rating: 5 out of 5
Extension Builder in South Kensington
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
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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!
AVBase Building Services London Limited
No reviews yet
Extension Builder in South Kensington
Avbase Building Services London is an award-winning family business with a deep-seated commitment to transforming homes. With over 20 years of experience in the construction and home improvement industry, we specialise in creating additional space with bespoke house extensions and loft conversions, designed to your unique requirements. Our comprehensive services include meticulous design, thorough planning, and efficient build processes, ensuring a seamless experience from the initial concept to the final touches. Our expertise includes side return projects, offering creative solutions to utilise every inch of your property effectively. We are proud to be known for our reliability, attention to detail, and the impeccable cleanliness we maintain throughout our projects. Serving London, we are committed to turning your house into the home of your dreams.
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Daniel
No reviews yet
Extension Builder in South Kensington
👋 We are a small Italian family-run business based in North West London, specialising in tiling, kitchens and bathroom refurbishments. 🧱 With over 25 years of hands-on experience, we take pride in delivering precise, clean and long-lasting results. ✅ All our work is guaranteed and carried out with attention to detail and respect for your home. 📍 We cover West Hampstead, Kilburn, Camden, and surrounding areas. 📩 Feel free to request a quote – we respond quickly and are happy to visit for a free assessment.
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JS CONSTRUCTION BUILDING SERVICES LTD
Rating: 5 out of 5
Extension Builder in South Kensington
Ive been working as a Builder in UK for over 20 years now doing all variety of jobs through the time. Im based in West London but me and my team can travel almost anywhere to get the job done. Like i mentioned through out the time i did all kinds of jobs from building houses from zero to small jobs as bathroom fitting or refurbishing. With my team i always try to make sure to fulfil needs of my customers. We are reliable.
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Latest review:
2 major projects: upgrade to our home and rental property over past year included: substantial extension, new kitchen, renewed plumbing/electrics, complete redecoration and external thermal cladding. Final costs as per original quote. Work of a high standard carried out on time. Honest, professional and easy to deal with. Will use them again. Highly recommended.
Delta Electrical Solutions Ltd
Rating: 5 out of 5
Extension Builder in South Kensington
My work consists: . ALL ELECTRICAL AND FIRE ALARM INSTALLATIONS. . NICEIC DOMESTIC AND APPROVED CONTRACTOR. . FULL REFURBISHMENT . EXTENSIONS AND LOFT CONVERSIONS. If your looking for a reliable hard working and fully qualified team of builders look no further then Delta Electrical Solutions Ltd.
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Latest review:
Electrical- 10 Oct 2018
Glorian was super speedy fitting spotlights in my living room and kitchen. He was very tidy and did a great job all round.
SpectRoom property Maintenance LTD
Rating: 5 out of 5
Extension Builder in South Kensington
At SpectRoom Ltd we pride ourselves for being prompt, working to budget and on time and are very clean. We will fully complete any project including all decorating flooring tilling construction and all other property maintenance jobs to customer requirements and for that we will be more than happy to provide local references. SpectRoom for spectacular rooms.
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Latest review:
Extensions- 22 May 2019
Jacob was very accommodating and flexible. His team were great and he completed the work nicely. There was some splatter from the cementing on to my neighbour's wall. He tried to clean it off but it wouldn't all come off. Therefore, he went out and bought some paint and repainted their wall. I would get him back for more work without hesitation. When looking for a builder - they have to be honest, work hard and to an excellent quality without cutting corners. They should be responsible to ensure neighbours property isn't damaged and provide consultancy as what we want and want is realistic can differ significantly! - and if any issues rectify them once the job is complete and of course provide good after sales. I have used several builders over the years - very few tick all of the above boxes. Jacob certainly does.
StructurAll Ltd
No reviews yet
Extension Builder in South Kensington
We started our company as an engineering consultancy. We developed over the years to provide in-house architectural services, interior design, structural design, project management and asset management capabilities. We believe in client service and support throughout the life of a project, rather than just providing a design solution. So we have gained a reputation of being a one-stop-shop amongst our clients; who include private individuals, contractors, and local authorities.
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Buildleader
Rating: 5 out of 5
Extension Builder in South Kensington
Our home refurbishment company BUILDLEADER is based in London. We offer full house renovation requiring extensive electrical, plumbing and structural work. All of our tradesman are professionals with over 15 years of experience who get the job done on time, on budget, and to the highest standard. We handle every project with the utmost competence and respect.
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Latest review:
Bathroom Fitting- 28 Mar 2022
Good plumber, call them in for shower replacement
Kaseno Group LTD
Rating: 5 out of 5
Extension Builder in South Kensington
Our company is based in London. We do all aspects of the construction. Our main target is to achieve the finest quality of our services and to satisfy any of the clients' requirements deliver the project on time and achieve a reasonable price.
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Latest review:
Kitchen Fitting- 19 Jan 2019
Very good, professional ,trustworthy team.I can recommend them to anybody. Their communication was excellent. The work they have done is of high stardard and was done on time.
Delcio
No reviews yet
Extension Builder in South Kensington
From small handyman jobs to building large extensions and houses refurbishment. specialise in all types of work. Portuguese company, just start a new bussiness…the work is done like it was for me!! I am a father of 5 children and I do everything with the best for everyone in mind. Look forward to hearing from you. Thanks
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Lusha construction ltd
No reviews yet
Extension Builder in South Kensington
LUSHA CONSTRUCTION LTD A reliable and readily available who has been operating for the last 10 years. We pride ourselves in providing a professional, friendly, and high-quality service to fulfil the needs of our clients. These include: Ground work Refurbishment Remodelling Tile work installation Bathroom Fitters Bathroom design Bathroom refurbishment Bathroom renovation Carpentry Carpentry and Joinery Commercial builds Decorating Electrics Extensions Kitchen Fitting Landscaping Loft conversion Plastering Plumbing Rendering Restoration Underfloor Heating Fencing etc.. Our professional and friendly team members are happy to talk you through your needs and give you a free quote, so why not give us a call to get a free quote.
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Imperial Real Estate Holdings Ltd
Rating: 5 out of 5
Extension Builder in South Kensington
We are a trusted local construction company with over 8 years of experience, delivering high-quality extensions, loft conversions, and bespoke home renovations across London, Kent and other surrounding areas. From initial consultation through to completion, we take a considered, professional approach — working closely with homeowners to ensure expectations, budgets, and timescales are managed properly. We pride ourselves on attention to detail, reliable workmanship, and running clean, well-organised sites. Based in Bromley, Much of our work comes through recommendations and repeat clients, and we’re known locally for delivering projects to a high standard, without cutting corners. ✅ Fully insured and qualified team ✅ CHAS accredited (health & safety compliant) ✅ Constructionline registered ✅ Safe Contractor approved ✅ Fixed, transparent quotes — no hidden costs ✅ Dedicated project management from start to finish ✅ Clean, organised sites with respect for your home ✅ Clear communication and realistic timescales ✅ Trusted local company with a strong local reputation If you’re looking for a builder who values quality, transparency, and trust, we’d be happy to discuss your plans.
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Latest review:
Very few tradesmen can engage in a detailed, professional and friendly manner. They took out an old kitchen and replaced it with a new one - which the helped source at below market cost saving us in excess of £5000. Right from conception to finish, there was full transparency of the costs and crucially at the end, no cost overruns. Definitely five stars and will reengage again for other building/renovation works I have planned.
k+c studio
Rating: 5 out of 5
Extension Builder in South Kensington
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Latest review:
CAD / Drawings- 5 Dec 2021
So far so good very helpful and would use her again very professional
Alin Dragos
Rating: 5 out of 5
Extension Builder in South Kensington
Both customers that have long-term and short-term jobs are welcome to contact me. I am very organised and punctual, I can cope with working under pressure, being serious and flexible in the same time. Therefore I can make a schedule that suits both the customers and myself.
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Latest review:
Hard Flooring- 7 Nov 2017
I hired Alin to install laminate flooring within a quick time frame. Alin was quick at replying and scheduling in a date. He gave good advice to suit our needs and worked fast and efficient. He has always been professional at my home. Alin got all the work done within one day which I was delighted with. We are very happy and confident in him so we have hired him back to do many other jobs in our home.

4.2

Top rated Extension Builders

Our Extension Builders in South Kensington, are rated 4.2 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 South Kensington?

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 South Kensington 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 South Kensington who are available and interested can respond to your post.

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

What are the hourly rates of extension builders in South Kensington?

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

Find extension builders in South Kensington with MyBuilder

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

Step 2: Compare different extension builders in South Kensington

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

Step 3: Hire South Kensington extension builders with confidence

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

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

What to ask a South Kensington extension builder before hiring?

Before hiring an extension builder in South Kensington or extension building company in South Kensington, 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 South Kensington?

An extension builder in South Kensington 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 South Kensington 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 South Kensington?

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 South Kensington 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 South Kensington 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 South Kensington

Can an extension builder in South Kensington help with planning permission?

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

Many South Kensington 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 South Kensington help with materials and finishes?

Yes, most extension builders in South Kensington 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.