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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.
We have 45 years experience between us in the construction industry and 25 years experience in all types of roofing including rubber, fibreglass, slate and tiled roofing. Chimney removals, facias soffits and water goods. & fitting vellux windows. We also have 25 years experience in groundworks., landscaping, operating plant. bricklaying, rendering. we specialise in new builds, extensions, renovations, loft & garage conversions & damproofing. We have a lot of experience in sourcing properties to renovate for resale and rental. We cover all aspects of home improvements.
Excellent service. Got the job done well and very professional.
Albatross Carpentry LTD
Cellar & Basement Conversion
Established in 2005, Albatross has garnered over a decade of expertise, delivering meticulous carpentry services throughout Surrey, Sussex, London, and the neighboring regions. Our portfolio boasts successful management of diverse projects, ranging from bespoke client builds to expansive multiple unit developments. We take immense pride in fulfilling our customer's requirements with utmost dedication. To ensure impeccable results, we meticulously source and utilise quality materials from trusted suppliers, and our commitment to timely project completion sets us apart as a reliable partner for your development ventures. Our services include: 1. DESIGN + PLANNING Professional and affordable design and planning service to help you through the entire build process. 2. NEW BUILD CONSTRUCTION Our team are experienced at turning ideas into reality for commercial and private contracts. 3. FULL REFURBISHMENT High-standard refurbishments for single rooms or entire properties. 4. FIRST + SECOND FIX Comprehensive assistance for structural work and second fix needs. 5. ROOFING REQUIREMENTS We offer quality roofing services, from replacements to new installations, tailored to meet your needs. 6. KITCHEN FITTING Expert kitchen fitters as well as bespoke cabinetry options.
MC Home Improvements
Cellar & Basement Conversion
We are a family run business that has been running for the last 25 years we specialise in new roof UPVC flat roofs, roof repair repairs, cladding, repointing painting roof cleaning driveway cleaning resin driveways and all other driveways
Good,clean,efficient work carried out quickly.
Hi, This is Alphatec ltd. We have specialised team to take all types of building jobs. We are specialised in Bathroom fitting, Plumbing , electric , new builds & renovations
Inder did a very good job of upgrading our upstairs bathroom and installing a toilet downstairs. He worked tirelessly and was very punctual. Great on communication too!
We are a landscape and home improvement company and cover north, west wales and the Midlands. We specialise in all hard and soft landscaping. We aim to carry out professional work with nptc qualifications for any arb work and over 20 years home improvement experience in the team.
Excellent service. Shaun was very communicative, and made sure the job was done well. Definitely recommend.
Domestic and commercial properties maintenance and renovations
I hired Alex he repaired all requested faults and pointed out issues other plumbers failed to sort. He sorted out all the issues causing my current plumbing problems. He was professional friendly and efficient and kept me informed throughout. I would willingly recommend him and will definitely hire him again.
AK Construction SW LTD is an experienced, growing building company based in Taunton, Somerset. We cover all aspects of the building, maintenance and decoration trades and we love to leave a finished job that we can be proud of. We're well known for the quality of our work and attention to detail. As such, our services are sought after from small jobs to larger projects like extensions and refurbishments. We also specialise in bespoke English Larch decking and fencing as well as outdoor offices and garden rooms to transform your outdoor areas and add long lasting kerb appeal to your home. We're available to undertake a diverse range of jobs big and small, from skilled and detailed refurbishments, bathroom remodelling, kitchen installations, carpentry, decorating, plumbing, general building and electrical repairs, to complete renovations, improvements and property extensions. Our small and friendly team of skilled tradesmen take pride in our work and strive to finish each job to a high standard and would love to come and quote for your needs. All work fully insured.
Fred and his team did a brilliant job replacing my bathroom floor and shower. Every effort was made to ensure job was completed to the highest standard and we can’t be happier with the finished product. Would highly recommend AK constructions SW for your building needs.
We are a family run Utility & reinstatement business that are based in the area of Coventry. We have been trading since 2016. We specialise in gas, water and electric service renewals to existing and new builds and also offer driveways, and drop kerb services. Also brickwork ,concrete pads . Garden make overs . All our workers are time served with correct credentials and experience. We hold the below accreditations 1. iso9001 2. Constructionline Gold 3. Acclaim 4. SSIP 5. LRQA GAS, WATER & ELECTRIC services & mains 6. Tarmac, backfill, bricklaying nvq
after three appointments to start job, never showed. Job not done.
Www.kerrconstruction.co.uk Welcome to Kerr Construction. A company with a full range of experience to ensure all projects are completed with the best quality. We cover a wide range of projects with a capable team. Ensuring the best possible outcome on all projects for the client.
J.K.ModernBuild
Cellar & Basement Conversion
Hi, my name is Jamie. my company is J.K.ModernBuild, I have many years of experience in the building trade and can offer advice on the job you need to be undertaken. we undertake many trades and furnish to a very high standard and professionalism -extensions -groundwork -landscaping -plastering & rendering -bathroom & kitchen fittings -soffits, fascias & guttering we take pride in our name and work, contact me and I would be happy to help and answer any questions you may have.
ABLE HOLDINGS LIMITED
Cellar & Basement Conversion
Able flooring and renovations have been operating in the south east coast since 2020. We are covered with up to 5 million PLI and 1 million LI. Read our reviews on google / Checkatrade / TrustATrader for a review on just some of our works we have carried out. We work both residential and commercial sectors.
Welcome to KM Roofing- Your Plymouth Roofing Experts KM Roofing - Your Reliable Partner for High-Quality Roofing Services. At KM Roofing , we are proud to be the leading roofing professionals in the Plymouth area. With our extensive experience and unwavering dedication to excellence, we are committed to delivering high-quality roofing services to both homeowners and businesses. If you require roof repair, replacement, or a new installation, the J&P Roofing Solutions team of skilled and certified roofing experts is ready to cater to your residential roofing needs. We recognise the significance of a secure and long-lasting roof for your home, and we guarantee that each project is executed with the utmost standards of craftsmanship. Business proprietors in Plymouth rely on us for their commercial roofing needs. Whether it's flat roofs or pitched roofs, we possess the expertise to address a diverse array of commercial roofing requirements. Our objective is to safeguard the durability and dependability of your commercial property's roof, preserving your investments and assets. Emergency Roof Repairs: Unexpected roof damage can occur at any time. That's why we provide fast and dependable emergency roof repair services. Our team is on call 24/7 to tackle urgent roofing issues, delivering swift and efficient solutions to safeguard your property. Why Choose KM Roofing Ltd Expertise in Plymouth : As a roofing company based in Plymouth , we have a deep understanding of the distinct challenges presented by the local climate and building regulations. Our specialised knowledge is customised to address the specific requirements of the Plymouth community. High-Quality Materials: Our materials are carefully sourced from reliable suppliers to guarantee that your roof is constructed to endure the elements and endure the test of time. Ensuring Customer Satisfaction: Our dedication to ensuring customer satisfaction is steadfast. We maintain transparent communication, deliver precise estimates, and endeavour to surpass your expectations for each project. Fully licensed and insured: Your peace of mind is our priority. We are fully licensed and insured, providing you with assurance in the quality and dependability of our roofing services. Contact Us Today Whether you're facing a roofing emergency or embarking on a roof improvement project,
BARWORTH HOMES LIMITED
Cellar & Basement Conversion
At Barworth Homes, we stand by our commitment to quality and craftsmanship. Every project we undertake is built with meticulous attention to detail, delivering lasting results that are as beautiful as they are durable.? ?Our customer-first approach means your satisfaction is always our top priority. We work closely with you to understand your vision, preferences, and lifestyle, crafting spaces that feel truly personal and perfectly tailored to to create spaces that truly reflect your vision.
MB offers all trades services for property and buildings. We undertake residential,commercial and industrial installations,improvements and maintenance. We offer honest,fair,competitive pricing alongside experience and good customer service/relations.
Very happy with job.
At ICON_Interiors , we are a family-oriented construction business with over 15 years of experience delivering high-quality building services. From kitchen and bathroom installations to full house renovations, loft conversions, and restaurant refurbishments, we pride ourselves on being able to take on projects of all sizes—no job is too big or too small. Our team brings a vast knowledge of various trades, allowing us to handle all aspects of construction with confidence and skill. We also collaborate with a trusted network of specialist tradespeople to ensure every project is completed to the highest standards. Whether you're planning a small renovation, a major extension, or any construction work in between, we are committed to delivering exceptional results. With numerous satisfied clients, glowing references, and a portfolio of completed projects, we are confident that we can bring your vision to life. Contact us today to discuss how we can help with your next project!
M&A Property Specialists LTD is a family run business covering all aspects of Joinery and Building works. We thrive on the quality and finish of the projects we undertake. We have our own architects and structural engineers who provide all the required details for extensions, conversions and new builds. APL also organise all site visits with building inspectors to give customers peace of mind and a hassle free service. At M&A we use our own 3D CAD system in order to design any new kitchens we are to supply and install, we can include these in to Architecht plans to give you a visual of the room once completed. All our kitchens are high standard and all our doors we use are FIRA gold approved, we mainly use painted doors but if you want a more of a budget door we can use the vinyl wrap doors. About myself: I have been in the Joinery and building industry for 20 years with a huge vast experience in all trades and I know what to expect from various tradesmen from a finishing point. All electrical work and gas work is all completed by approved and qualified tradesmen. My main trade is joinery but in the 20 years of being in the building game I have gained the experience in each aspect in the building game which has its advantages when project managing a job whilst being on site working. M&A look forward to providing competitive quotations for our customers and working with yourselves as we have just came back to rated people. Payments to M&A can be made via Bank transfer, Cash or Credit/Debit card
Anthony was brilliant, fitted a new kitchen in my Daughters home, absolutely delighted with the service and the quality. would highly recommend APL .. Dave
At Chingford Home Improvements, we believe that true luxury is defined by more than just aesthetics—it’s about creating spaces that reflect your aspirations and enhance the quality of your life. With a commitment to impeccable design, flawless execution, and exceptional customer care, we turn homes into personalized havens of comfort and elegance.
Hello, and welcome to Home Fixology – your friendly neighbourhood home improvement experts! At Home Fixology, we don’t just fix homes; we build trust through a personal touch that turns every project into a unique journey. If you want to see our growing portfolio of reviews, you can check us out on UK TRUSTPILOT: Home Fixology We're on FACEBOOK too: homefixologyltd Services we provide: Roof restorations: Repairing and refurbishing roofs to improve their structural integrity and appearance. #ProPERLA #Renotec Wall coatings: Applying coatings or finishes to exterior walls to protect them from weather damage and enhance their aesthetics. #ProPERLA Driveway restorations: Repairing and refurbishing driveways to improve their appearance and durability. #Resiblock Flat roof services: Repairing or replacing flat roofs to prevent leaks and water damage. #FirestoneRubberRoof Render repairs: Fixing and maintaining render on exterior walls for structural integrity and aesthetic purposes. Loft insulation: Installing insulation in lofts or attics to improve energy efficiency and reduce heating costs. #SuperFOIL Damp proofing: Treating and preventing dampness and moisture issues in buildings to protect against structural damage and mould growth.
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