Extension Builders in Keston

Name: Extension Builder
Brand: MyBuilder
SKU: extension-builder
Rating: 3.9 (19 reviews)

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Some of our top rated extension builders in Keston

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Joni building services
Rating: 5 out of 5
Extension Builder in Keston
We are family run with over decade of experience on businesses we do full bathroom refurbishment full house refurbishment , repairs , maintenance,etc
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Latest review:
Bathroom Fitting- 2 Mar 2026
I can’t recommend him highly enough, in just three days, he identified and resolved my bathroom leak that could easily have become a much bigger issue. He took the time to thoroughly investigate where the water was coming from, clearly explained his findings and advised on the most sensible next steps before carrying out the work. From start to finish, his work ethic was exceptional. He arrived promptly at 8am every day and worked through until 6:00pm without a single complaint, no matter how demanding or time-consuming the job became. His efficiency was impressive but what stood out even more was the quality of the finish - the bathroom now looks brand new again. Professional, hardworking and meticulous in his standards, he delivered outstanding results in a very short timeframe. I wouldn’t hesitate to use him again or recommend him to anyone needing reliable, high-quality building work
Top Finish Ltd
Rating: 4.6 out of 5
Extension Builder in Keston
We are a property refurbishment specialists with a wealth of experience in house extensions,basements,loft conversions,bathrooms kitchens and much more. We have built a reputation on the basis of providing clients with a quality service that is combined with excellent value for money. .
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Latest review:
Extensions- 16 Dec 2014
These guys were amazing!!! They have done a fanstasic job. There standard of work was extremley high. They turn up on time every day monday to friday and they also offered to work the weekends to speed up the project if needed...... which i did. The price was very competitive and i would definitely use them again always! Get them while you can!
Croham Builders
Rating: 4.7 out of 5
Extension Builder in Keston
You can rely on Croham Builders to guide you through every step of your project. We take pride in providing our customers with expert advice throughout all construction phases. And although we think modern, our team is traditionally trained and is dedicated to high-quality workmanship using the latest techniques. houses, bungalows, etc. Office building Structural repairs and extension Building conservatories
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Latest review:
Conversions - General- 23 Nov 2017
Calvin and Jimmy have been absolutely brilliant, and have been the best builders that I have employed. So much so, that I have subsequently asked them to do a whole shopping list of things, from fitting a kitchen to removing an old fireplace. They are always on time, very polite, kind and knowledgeable. Best of all, they get things done quickly without any fuss. Calvin has been invaluable in sourcing items from trade required for the latest project, and clearly talks through requirements of any project. I would very happily recommend them for the excellent value they offer and fantastic level of workmanship.
Company of builders ltd
Rating: 5 out of 5
Extension Builder in Keston
At Company of Builders, we believe a home is never just bricks, timber, and paint. It is where families grow, where memories are made, and where people should feel safe, proud, and comfortable every single day. That is why we treat every project, no matter the size, with genuine care, respect, and attention to detail. We are a family-run building and renovation company with a hands-on approach and a passion for creating spaces that truly work for the people living in them. From repairs and refurbishments to kitchens, bathrooms, flooring, tiling, extensions, loft conversions, roofing, fencing, and general property improvements, we work closely with every client to understand their vision and bring it to life with honesty and skill. For us, building is personal. We know how important trust is when inviting a team into your property, so we aim to make the whole process smooth, clear, and stress-free. We listen, we advise, and we take pride in delivering work that we would be happy to have in our own homes.
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Latest review:
The work was done professionally, efficiently, and to a high standard. Everything was explained clearly, the team was trustworthy, and the final result gave us complete confidence in the quality of the drainage and plumbing system. Highly recommended.
N M W BUILDING SERVICES LTD
Rating: 5 out of 5
Extension Builder in Keston
NMW Building Services provides a high quality service with only the aim for great customer satisfaction. We are a small but highly reputable company; skilled and qualified in all aspects of building work. We always respect clients wishes and work hard with them to achieve their desired results.
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Latest review:
Extensions- 20 Jun 2025
Neil is simply brilliant; a great communicator, honestly priced and great at his job. We have been so pleased with our extension and would not hesitate in recommending Neil to anyone who is unsure who to trust.
Sd building contractors ltd.
Rating: 5 out of 5
Extension Builder in Keston
I am in this trade from 2010
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Latest review:
Ranjit has done two full house renovations for me and I can confirm he is absolutely brilliant. He is professional and polite. His work and knowledge of the building industry is top class and the finishing is immaculate and perfect.i highly recommend him
Anderson brick
Rating: 5 out of 5
Extension Builder in Keston
Handyman 30 years experience in the building trade any job , I take great pride in making sure my work is carried out professionally and accurately and to a high standard my reputation sells itself 👍
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Latest review:
Handyman- 29 Aug 2020
Scott is punctual, very polite, knows his job really well. He came promptly after a courtesy call and completed the job to the fullest satisfaction. He made sure we are happy with the outcome and very friendly. I would highly recommend Scott for TV mounting, any unit assembly from flat box packing, fixing and installation and brick works. He knows everything and has loads of experience in this field. I will definitely use him again. Thanks Scott!!
Al Costa Construction LTD
Rating: 5 out of 5
Extension Builder in Keston
WHO ARE WE? With over 25 YEARS OF EXPERIENCE with AL Costa Construction, you will find the best services provided by professionals that understand and have the knowledge of the process of construction and renovation that best suits your project. It does not matter how big is your project, we work with excellence and dedication to reach perfect results. We try to merge trends with innovating materials and processes in each project, in order to achieve high standards results in every project. OUR TEAM Our team is formed by professionals that are able to perform your project with quality, so your dream project can get out of paper and become a dream come true. Our professionals are always concern with the client’s wishes and try to combine it with them expertise, in order to achieve a final result above expectations, functional and with premium quality. OUR GOAL We try to come up with the best solutions in construction and renovation to provide ours clients an excellent experience. Our main goal is to offer services that match ours clients needs, with an excellent quality.
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Latest review:
Hard Flooring- 11 Dec 2018
Did my 3 bedroom house wooden flooring for full house. Had a wonderful experience with Alex, great job and completed on time with good standards. He gave some good suggestions which improved the quality and neatness of work. highly recommending will work with him again.
Edi
Rating: 5 out of 5
Extension Builder in Keston
Hello my name is Edi.I am a general builder with 10 years experience.Renovation,Extension,Roofing, Kitchen,bathrooms,Wood Flooring,Gardening,Driveway etc
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Latest review:
Helpful; will hire again
A&z
Rating: 4.6 out of 5
Extension Builder in Keston
Hi I’m Zan, I have 12 years of experience working as a groundwork engineer. I am offering good discounted prices whilst I establish my business! I offer the following services: -Digging foundations and all general groundwork -Gutter cleaning -Roof damage repair -Demolition -Pipework
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Latest review:
Groundwork & Foundations- 6 Sep 2026
Very disappointed with the service provided. The climbing frame was not installed properly, and there are still serious safety concerns, including an exposed/open nail that could potentially cause injury to a child. Parts of the frame are also still loose and moving, which makes it unsafe. When the builder asked for payment, we paid as requested. However, when we contacted him afterwards to come back and complete the remaining work and fix the safety issues, he ignored our calls and never replied to our messages. This is especially concerning because this is children’s equipment, and safety should be the highest priority. I would not recommend this builder based on our experience. We have been left with an unfinished and potentially unsafe climbing frame despite paying for the work. My advice to others would be: do not make the full payment until all the work has been properly completed, checked, and you are satisfied that everything is safe and secure. Would not recommend him
FERARU GROUP BUILDERS LTD
Rating: 4.7 out of 5
Extension Builder in Keston
I've worked in the UK for 8years now and I do my job to a high standard.
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Latest review:
Extensions- 15 Jun 2024
My advice is avoid. Poor communication Poor workmanship Poor quality finish Create 'issues' during build to make you pay more than quoted Left project incomplete We pursued through the Court and won the case, but of course he is unable to pay, so we are pursing further through the Court. He will respond to the review with some excuse, but there is absoultley no excuse for poor workmanship and quality. Happy to share pictures and videos on request.
Venus Constructions Ltd
Rating: 5 out of 5
Extension Builder in Keston
Hi, thanks for taking time reading.. our team at Venus Constructions specialises in all types of residential works and our range of services covers complete refurbishment, conversions, external buildings, patio, turf, driveway, decking, fencing, brickwork, blockwork, rendering. Depends of team member we have years and the necessary experience based on the works needed. Listening to the clients needs we assure with punctuality high quality results and workmanship of our friendly team.
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Latest review:
Landscaping- 28 Mar 2022
Gianni and his friend did an amazing job on our garden grass and planter. They came to see the garden before providing us with the quote. They were very professional, punctual thorough and quick. We were very impressed that they started the job the following day and that they were able to provide all the materials. We will definitely recommend them to friends and family.
Levi parrant
Rating: 3.9 out of 5
Extension Builder in Keston
LP JOINERY Established in 2019, Undertaking all types of domestic work from carpentry to bricklaying to plumbing.
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Latest review:
Carpentry- 13 Apr 2026
Levi replaced 2 doors and also fixed my store room door. Did the job at very reasonable cost. Very polite, professional and also left the house clean. Will hire again for other work. Highly recommended.
Designs and Developments
Rating: 5 out of 5
Extension Builder in Keston
At Designs and Developments we have a wide variety of services ranging from bathrooms, kitchens, flooring, decorating loft conversions and extensions.
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Latest review:
Kitchen Fitting- 31 Jul 2019
To say Nick is just a kitchen fitter isn’t doing his work justice, he’s a fantastic project manager and craftsmen as well. When we first met Nick he took 2 hours of his time running through all the options which was when we realised we were actually quite clueless! Although we hadn’t hired him at this point his advice was invaluable. We assumed this would mean Nick’s professionalism would mean he would be very expensive, this was not the case and he was actually a little cheaper than the other parties who quoted. Once Nick started it became apparent that he and his assistant Chow to great pride in their work and worked hard to get the job finished as quickly as possible to the highest standard. They left the site spotless at the end of each day. The result is a fantastic kitchen and flooring which we are extremely happy with. We are already thinking about the next renovation piece in our home and would love to use Nick again. Thanks Nick! Niall & Hannah
LBS Property Maintenance Ltd
Rating: 5 out of 5
Extension Builder in Keston
When it comes to fulfilling a full-range of home-renovation needs, we are the team-of-choice for central and southeast London property-owners. Entrusting your building-needs to us means your work is done now, done right, and done at an affordable cost. Guaranteed.
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Latest review:
Extensions- 7 Jan 2019
I would definitely recommend LBS Property Services and would definitely use them again. LBS have a highly professional team and are very well organised and managed on site. Raymond has a very collaborative, proactive and honest approach with excellent communication skills and was a pleasure to work with throughout all stages of the project. All works were completed to high standard within the agreed construction programme.
Coulsdonbuilders Ltd
Rating: 5 out of 5
Extension Builder in Keston
Coulsdon Builders has been successfully making home improvements for over 15 years. We are ready to fulfill your needs as a builder. Whether you desire a full renovation to create your new dream home or home improvements or general enhancements to add value and space to your property, we are here to assist as a contractor. Coulsdon Builders can propose and carry out the best building solutions for you to achieve your building goals, within your budget and in a short time-frame.
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Latest review:
I wanted a side infill extension, converting a one bed into a 2 bed. The works was undertaken by Coulsdon Builders which took around 8 months. I made several changes throughout the project hence the delay. They were so accommodating and never had an issue and was always happy to cooperate. The cost of build was £120k and we stuck to the budget. I am delighted with the works and am grateful they made my house a home. They were clean and tidy on a building site and always kept me updated on progress. This is one builder that I highly recommend and trust. Great work guys and thank you again!

3.9

Top rated Extension Builders

Our Extension Builders in Keston, are rated 3.9 out of 5 based on 19 reviews from customers like you.

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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 Keston?

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

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

What are the hourly rates of extension builders in Keston?

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

Find extension builders in Keston with MyBuilder

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

Step 2: Compare different extension builders in Keston

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

Step 3: Hire Keston extension builders with confidence

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

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

What to ask a Keston extension builder before hiring?

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

An extension builder in Keston 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 Keston 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 Keston?

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 Keston 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 Keston 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 Keston

Can an extension builder in Keston help with planning permission?

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

Many Keston 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 Keston help with materials and finishes?

Yes, most extension builders in Keston 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.