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Craig got in touch quickly, gave me a rough estimate over the phone and answered all my questions. Surveyor arrived on time, gave instant quote. Price was good. Michael and (another) Craig turned up to do the job on the day, time given. Good, tidy job. Can't fault anything, from start to finish!! Would recommend!
Mary
George and his team are experienced builders, replaced my front door with a custom frame/sidelights and raising the floor level in the hallway quite quickly - in fact, they were the only who came next day, gave a quote straightaway and were ready to start in just couple of days. They also had all the necessary tools and materials, were ready to buy something additional quickly on the day - if further adjustments were required to fit everything as I asked. Thanks a lot for your help, guys!
Dmitry
Highly recommend. These guys did a fantastic job of constructing our pergola and decking. Very hardworking and reliable. The job was completed in the time frame agreed and to a very high standard. We would 100% use them again.
Holly
A basement conversion has the potential to add a lot of value and space to your home. Once your team excavate your new basement, you can turn it into a bedroom with an ensuite bathroom, a new gym, a living room, or any other living space to transform your underground spaces into useable rooms. Find everything you need to know about hiring a local cellar conversion specialist. Below, we cover tips to help you find a basement conversion specialist:
Browse Cellar & Basement Conversion specialists
Take a look at our Cellar & Basement Conversion specialists profiles, read reviews and request quotes directly.
How to find a reliable, local basement conversion specialist
What does a cellar conversion involve?
If you already have a basement, then you might be looking to turn it into a liveable space by adding structural supports, damp-proofing, insulation, heating, and a new ventilation system. If your cellar was intended for storage and has low ceilings, your basement conversion team might have to dig down to increase the head height before they can add things like new plumbing and electrics.
Or, you might be thinking about extending your current basement, such as by digging underneath your garden. This is another great way to add more space and additional rooms to an existing basement.
If you don’t currently have a basement, you can also create a new one by carrying out excavation work. As well as the basement, you’ll also need a new staircase.
Whether you want to build a cellar from scratch or want to turn your cramped storage room into a brand new living space, a basement conversion specialist can help.
Factors to consider before hiring a basement conversion specialist
On average, a basement conversion can take anywhere from 12 to 20 weeks to complete. Avoid stress and costly repairs down the line by hiring a skilled specialist to help you upgrade your home. Look out for basement conversion installers that:
- Are a skilled company with a strong history of high standard projects
- Have all the licenses and insurance needed to protect you and their workers
- Have a good range of positive reviews from previous customers vouching for their reliability
- Are available to carry out the work in the timeframe you need it by
- Are quoting a price and payment option that you are happy with, having compared the quote with other basement conversion companies
How much does a basement conversion cost?
If you don’t have space for a rear or side extension, and don’t have a loft to convert, then a basement conversion is a great option to maximise your home’s space. How much you’ll end up spending on your basement conversion depends on a range of factors, including:
- The size and layout of your basement
- How many structural changes will be needed, including extra support beams and underpinning
- Waterproofing and damp proofing costs, as well as the installation of effective drainage systems
- Whether you want a window well installed, which can help you introduce light into your basement
- Basement insulation and soundproofing
- Labour costs, which are affected by where you live in the UK
The average basement conversion costs between £120,000 and £160,000. For a more accurate quote for your specific project, speak to a basement conversion specialist today.
Other basement conversion FAQs
Do I need planning permission for a cellar conversion?
You generally do not need planning permission if you are converting an existing basement into a living space without changing the building's external appearance. However, you will likely need approval if you are excavating a brand-new cellar, creating a separate living unit, or working on a listed building.
For more information, contact your local planning authority or visit the Planning Portal website. You can also read our planning permission guide for more information.
What questions should I ask before hiring a basement specialist?
Always ask if they carry public liability insurance, how many years of experience they have, and for a detailed cost breakdown and project timeline. You should also confirm if they use subcontractors, ensuring any gas engineers are Gas Safe registered and electricians are appropriately certified.
What is a sump pump, and do I need one?
A sump pump is a drainage system installed below the basement floor that automatically pumps out any groundwater that collects under the property before it can flood your room. Because cellars are naturally below the water table, a sump pump paired with a waterproofing cavity drain membrane is almost always required to ensure your conversion stays completely dry and structurally safe.
JK CONTRACTORS
Cellar & Basement Conversion
Our company is a well-established building and contracting firm with years of experience in the industry. As a qualified electrician and builder, we offer a wide range of services to meet the needs of clients. With our expertise and in building contracting work, we specialize in various areas such as brickwork, block work, extensions, plastering, electrics, plumbing, carpentry, and joinery. This comprehensive range of services allows us to handle every aspect of a construction project, ensuring a seamless and efficient process from start to finish. Our years of experience in the field have equipped is with the knowledge and skills necessary to deliver high-quality workmanship. We have a deep understanding of construction techniques and industry standards, ensuring that every project is completed to the highest standards of quality and safety. In addition to our practical experience, we have also invested in education and training to stay up-to-date with the latest advancements in the industry. This commitment to continuous learning allows us to incorporate the latest techniques and technologies into your work, ensuring that our clients receive the most innovative and efficient solutions. Overall, our company's combination of experience, specialties, education, and training positions us as a reliable and skilled provider of building and contracting services. Whether it's a small renovation or a large-scale construction project, clients can trust your expertise to deliver exceptional results.
-Extensions -Conversions -New build ,Refurbishments Garage conversion Flat roofs And more.
Piotr was meticulous in his work and very knowledgeable. He did a great job for me and I would use him for any further projects I have.
Kandy Construction Cotswolds
Cellar & Basement Conversion
As A seasoned tradesman I pride myself on the quality of work I deliver in all aspects of any building project. My experience and expertise gained through many years in the business are an integral part of the service I provide. From extensions, renovations and everything in between including any smaller jobs, I can help you to plan, budget and turn your plans into a reality, my quotations are detailed and I always try to be competitively priced, all my customers are always very happy with the end result.
PF Roofing & Building Services
Cellar & Basement Conversion
P F Roofing is a family run business. I started P F Roofing early in 2016. However, I have 15 years' experience in the building and roofing trade. I take on all aspects of roofing work including leadwork, tiling, repairs, new builds, gutters, soffits and fascia. I work on both flat roofs and pitched roofs. No job is too big or too small, so give me a call for a free estimate/quote and all work is guaranteed. P F Roofing are reliable and trustworthy. We will give you a realistic estimate and only quote for work you need. If what you want doesn't need doing.... I won't do it unnecessarily or without letting you know my honest opinion.
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Here at dwj and son construction and landscaping we offer top quality work and reasonable rates. We Family run business with 20 years experience.
NEPTUNE BUILD LTD
Cellar & Basement Conversion
Small is beautiful We are a small, independent company based in East Sussex specialising in building extensions and refurbishment. The majority of our buildings are bespoke and tailored to suit the needs of individual clients and to fit particular situations
KL joinery services offering all types of joinery work
We were looking to change 7 internal doors and Kieran was first to reply , he came to see then he sent us the price for doors to buy and deliver and fully installed , when we accepted he came out on time and finished the job in one day and we are very happy with the work , thank you again Kieran .
We are a small family run business based in Dorset covering the New Forest, Bournemouth Poole and the surrounding areas. We undertake all aspects of roofing, UPVC and cleaning. We can quote on a any job large or small
Good job, but could have brought more replacement tiles. left debris in lower gutters.
Please check our Checkatrade reviews! This is a new account. Ellis Roofing and Building Ltd based on the Wirral. Covering Wirral and surrounding areas. Our goal is to exceed the expectations of every one of our customers offering a wide range of building, joinery, bricklaying and roofing. We have a vast knowledge and experience to provide our customers with outstanding results for any of their construction needs. Our prices are competitive and we offer great customer service.
The job was posted on 22nd July 2025 and Wade Ellis of Ellis Roofing And Building Ltd responded 2 days later. After a survey, I received a quote on 26th July, which was accepted. A skip arrived on 29th July and the work commenced next day. The job was completed on 1st August. The bricklayer and his female trainee assistant got on with the job without any fuss, and they were very pleasant to deal with. The aim of the project has been delivered and I am very happy with the result. I recommend them. 5 stars!
If you need plasterer, painter, kitchen fitter bathroom fitter or general building work we can help you immediately. We guarantee the highest quality of work
Couldn’t be happier with the remedial painting. Friendly from the start and no upselling at all, they just got on with it and the finish is excellent. They even sorted doors that wouldn’t close, shaving them to fit, and cleaned all the hardware. The flat was left spotless, with no paint specks anywhere. Extra bits I asked for were done with no fuss, and they even offered to source a missing handle part afterwards. The place now looks crisp and brand new. Highly recommend
local, experienced builders covering the South west
initial negative due poor communications..but now resolved as contractor was suffering with an illness which I accept and also have hired him to do the work. please consider my negative report as incorrect and deleted.
B J ROSE BUILDER
Cellar & Basement Conversion
Established family run building business for over 35 years. Specialising in everything from garden walls through full new build. Fully insured.
J & K Construction
Cellar & Basement Conversion
Family run business who can deal with anything in the construction industry, ranging from brickwork , slabbing, fencing & any outdoor work Honest , hardworking & respectful
Established in 2001, I.c.joinery are a well respected family ran company doing everything from small projects up to contract work for the ministry of defence. The pride we take in our work speaks for itself. Offering a full design, manufacturing (in our own workshops) and installation service, also project management with access to all trades.
Ian was so nice and helpful and did a fantastic job! Both my daughters and I are over the moon with the beds Ian has designed and made for us. Thanks you so much Ian
POWERHOUSE CONSTRUCTION
Cellar & Basement Conversion
Hi, We're powerhouse construction, We’re new to rated people but certainly not new to the trade. We're a small firm based in East Sussex with 16 years experience. We take old and run down spaces and turn them into awesome family homes. There's no need to sell your property, just extend or renovate to make more in equity We're great at maximising the potential. I hope we build your dream living area very soon. Typical size of job would range from a small renovations to big extensions.
W.Bradshaw Builders offer the full range of building services from start to finish. With over 25 years of experience we will turn your vision and dreams into a reality. In
PeakBrickwork SE ltd
Cellar & Basement Conversion
Davall construction have vast experience in all areas of construction and building maintenance. we deliver a quality service every time , with customer focus from concept to completion
Good price and completed the job quickly to good quality. Highly recommended.
MOST RELIABLE! SANDAROV LTD we know good work needs a great team. That's why when it comes to working with our customers for building and property maintenance we go above and beyond - doing all that's required to complete work to a high standard every time. With over 15 years of experience in the building industry, our reputation precedes us; thanks to our excellent attention to detail, competitive prices and long-term customer relationships. So, why should you choose SANDAROV for your next project? When it comes to delivering excellent quality work, you can rely on us. We're experts in our field, providing our clients with world-class work on anything from large-scale commercial construction to residential repairs. We pride ourselves on offering a dynamic, professional experience from the start to the finish of every project we undertake. With our professional experience and the pride we take in our work, no challenge is too large or too small for our talented team. Whatever your needs, let us know - and we can transform your plans and ideas into reality. With fast response times, bespoke design service and a two-year guarantee of all our work, you're putting your property in the safe hands. Got a fast turnaround on your next project? We offer fixed-price quotes and excellent timescales for a whole range of different construction and maintenance services, allowing you to get the work done when you need it done. Whether you're considering building from scratch, you're simply looking for a professional plumbing service, or you need some tiling done, we've got it covered. Our team of industry experts are equipped to complete the construction and maintenance work you need. From boiler installation to painting, carpentry to loft conversions; we're the ones you want to call. Thanks to our complete coverage for both employer and public liability insurance, we're a business you can trust to make those big changes. Our versatile team can do it all, whether it's providing maintenance to your existing property or transforming your kitchen or bathroom. We do it all, from full-house refurbishments to individual plumbing jobs. Whatever your problem, we're the service you can call and rely on. Do we sound like the perfect fit for your next project? Contact us today to find out more about our services, and what we can do for you. We're ready and waiting for your call, and we'll even provide you with a full reference list of our last projects for added peace of mind.
Anton did a great emergency call out job on some pipe work. I called him on Monday late afternoon, and he was able to come and see the work that needed to be done within the hour, he was then able to start work the following day, working around the roofers we had on site too. As I wasnt onsite when he did the inspection he sent me a video of the work that he was going to do, which was great! I would definitely recommend him, and will be getting a quote for some other jobs that need doing. Thanks Anton
With over 15 years building experience in the construction industry, GN Building Services (Stafford) Ltd are experts in all aspects of construction and project management. We specialise in both traditional and cutting-edge design and building methods. GN Building Services (Stafford) Ltd is not only a building company. We cover the entire project, from planning, design, building, renovating, electrical installation, tiling, and plumbing. We do not use subcontractors; all work is completed by our own employees. This means no delays, no waiting for specialist tradesmen; we finish the entire job within budget and on time.
If you want building work done then GN Building Services are brilliant, not just excellent!. Before we said to go ahead he had introduced us to four former clients and showed us the work completed. He and his team are probably the hardest working tradesmen I have ever come across and talk about working to time and budget. I should really keep this review quiet as they are very much in demand and I need some more work doing - but I can not rate them highly enough.
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