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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

Find everything you need to know about hiring a local cellar conversion specialist. Extend or renovate an existing basement, or excavate a new one from scratch.  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

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.

Transform your underground spaces into useable rooms with the help of a skilled cellar conversion specialist in your local area.

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.

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Picture of a basement converted into a living room with grey sofas and a glass panel staircase

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:

  1. Are a skilled company with a strong history of high standard projects
  2. Have all the licenses and insurance needed to protect you and their workers
  3. Have a good range of positive reviews from previous customers vouching for their reliability
  4. Are available to carry out the work in the timeframe you need it by
  5. Are quoting a price and payment option that you are happy with, having compared the quote with other basement conversion companies

A local basement conversion specialist is more likely to respond quickly as they’ll be right around the corner and ready to help.

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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.

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Do I need planning permission for a cellar conversion?

You won’t need to apply for permission for a cellar conversion, as long as:

  • You’re converting an existing residential basement into a living space
  • How you’re using it isn’t significantly different and the basement isn’t a separate unit
  • You don’t alter the external appearance of the property, such as by adding a light well
  • You don’t live in a listed building

Excavating a brand new basement which involves major works is likely to require planning approval.

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.

Picture of a basement converted into a living room with wooden staircase, wooden floors and cream coloured walls

Questions to ask before you hire a basement conversion specialist

Whether you’re looking to build a brand new basement or simply want to extend or improve your existing cellar, there are a few questions you should ask before you hire a specialist to excavate your new room:

Do you have public liability insurance and what does this cover?

While it’s not a requirement for them to have it, it’s a good idea for your basement conversion specialists to have public liability insurance to cover you and them against any accidental damage done to your home or personal injuries. Make sure to always ask your tradespeople what insurance they have before you hire them. This will guarantee protection for both parties.

How many years of experience do you have?

Knowing how many years of experience your basement conversion specialist has will allow you to pick a tradesperson who you are confident has enough experience to carry out a high quality job. When you’re finding a tradesperson through Rated People, head over to their profile to check out the pictures on their work gallery and their ratings and reviews.

Do you use subcontractors? If so, are they licensed and insured?

Your basement conversion specialist is likely to employ subcontractors. It’s a good idea to confirm the qualifications and insurance coverage of everyone who will be working on your project, including surveyors, structural engineers and electricians. Anyone working with gas needs to be registered with Gas Safe, and anyone installing electrics (in England and Wales) needs to be Part P certified to be able to self-certify their work. These tradespeople will have valid documentation that you can ask to check.

What is your estimated timeline for completing the project?

Knowing what the estimated timeline for completing the project is will help you set realistic expectations about how long your basement renovation will take to complete.

How much will the job cost?

Asking how much the job will cost will help you budget for your project and will ensure price transparency before you hire. How much you’ll end up spending depends on the scope of your project, and where you live in the UK, so make sure you add plenty of details when you post a job.

Find a basement conversion

Lambarde is located in the Sidcup area and covers most of the South east, we have a combined experience of 62 years, I started carpentry and building work as soon as I left school then going to college for two years becoming a fully qualified carpenter with Levels 1,2, NVQ Diploma. All of our team carry public liability insurance, so you’re in safe hands. We also work alongside other fully qualified trustworthy tradesman for our refurbishment works. We pride ourselves on: • Workmanship • Time keeping • Honest communication Portfolio on Instagram: Lambarde_ We specialize in: • extensions •.Loft conversions • Kitchens • Internal and external doors • Skirting and architrave • garden room/man caves • wall panelling • Roofs cut/pitched • Decking • Flooring laminate/herringbone • Ironmongery • Cladding • Refurbishments • Painting and decorating Free quote available

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Reviewed by Mark on 7/1/2023

Scott and his team did a fantastic job with our loft conversion. He was approachable, honest and friendly throughout. But most of all an excellent carpenter who did a first rate job with our loft and also dealt with our many requests and amendments with patience and professionalism. I have recommended Scott to friends and neighbours already and would recommend him for any work you are doing.

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Reviewed by Julie on 5/6/2024

Excellent, efficient job and area was left incredibly clean and tidy at the end. Very good communication throughout the quoting and arranging process. Highly recommended.

started business as parternership in 2007, we grown our portfolio from 2 houses to 86 units today, we also helped over 100 homeowners and 25 landlords including housing association, we help from a full consultancy package to build yur dreams to even help with leasing to our corporate contacts if you wish to invest. featured on HOMES UNDER THE HAMMER, we pride our selves in job well done, we always make sure we start projects within 2 to 3 weeks from time we agree and we always deliver our projects on time; we make the impossible a luxury and affordable possible while we take all the stress away; BGH combines technical expertise with exceptional customer service, ensuring every client benefits from cutting-edge technologies tailored to their home needs. with industry leading certifications and proven track record, BGH is a top choice for those seeking efficient, reliable and successful renovations We ate fully accredited Offer full guarantees and insurances including insurance backed guarantee and deposit guarantee We are specialist in new build, extensions, heavy refurbs, hmo and luxury conversions

Nu Space avatar

Nu Space

Cellar & Basement Conversion

Whether you're in need of a renovation, facing an emergency leak, requiring asbestos removal, or seeking efficient waste management services, we've got all your needs covered. Look no further for comprehensive property solutions at competitive rates. As proud members of the Federation of Master Builders, our skilled and experienced team possesses the necessary expertise to tackle any project. With a robust track record of successfully completing a variety of jobs in both commercial and residential settings, our team is fully equipped to handle projects of any size and complexity. Your satisfaction is our top priority, and we are committed to delivering optimal results for you. Choose Nu Space for a seamless, reliable, and expert approach to meet your requirements.

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Reviewed by Norman on 4/7/2025

reconstruct-it specialises in the following: - Insurance repair work - Emergency work - Kitchens and bathrooms We also offer Disaster Restoration services including: - Leak detection and emergency plumbing - Flood and water damage - Fire and smoke damage - Deep cleaning & disinfection services including bed bugs - Graffiti and vandalism restoration - Mould removal and inspection We serve both the commercial and residential markets. Insurance Claims We also specialise in managing insurance claims through our sister company Settld Ltd, and can advise if your job is potentially an insurable event. If it is, we can talk to your insurer and manage the claim on your behalf. Because we understand insurers we can get you a better settlement than if you tackle the insurer yourself. Our service is free if we are appointed to complete the repair works. We will take all the hassle away by: - Checking if your claim is valid; - Surveying the damage; - Creating repair schedules in line with insurance practice; - Negotiating with your insurer and their representatives; and - Managing the contractors and quality of reinstatement works. We carry the following credentials: - British Damage Management Association - Membership Chartered Institute of Building - FCA compliant, where loss assessing through our sister company Settld Ltd. (Settld Ltd is an Appointed Representative of Concept Building Solutions UK Ltd t/a Concept Claim Solutions which is authorised and regulated by the Financial Conduct Authority). Photograph used is for illustrative purposes only

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Reviewed by Mandy on 14/1/2024

We are specialised in Kitchen, bathrooms and all type of furniture instalation. We are team of handyman, plumer, electrician and carpenter.

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Reviewed by sofia on 22/11/2024

Excellent Kitchen Tiling! Peter did an amazing job! Professional, friendly, and efficient, he completed the work quickly. The pricing was fair, and he kept everything clean throughout. Highly recommend for quality tiling!

Just4U Builders We offer a wide range of home improvement and repair services, including: Painting Carpentry Flooring Plastering Plumbing Handyman Services Feel free to let me know if you'd like more details added or if you'd like me to assist with something else!

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Reviewed by mia on 3/6/2025

came on a sunday even - did a great job

For over three decades, Millington Construction has been a trusted, family-run business dedicated to turning customer ideas into reality, consistently delivering within budget and on schedule. Whether you envision an extension or require maintenance, our comprehensive expertise in the construction industry ensures all aspects of your project are covered. Comprising a skilled team of 12 professionals, each member brings a wealth of expertise and dedication to every project. Our Services: Extensions: From single-storey to multi-storey extensions, our experienced team of builders skillfully executes diverse projects tailored to meet your specific requirements. Maintenance: Trust us for meticulous maintenance services designed to keep your property in prime condition. Our Approach: At Millington Construction, we firmly believe in the strength of our team. Our highly knowledgeable tradespeople are passionate about transforming customer ideas and dreams into tangible results. They are supported by our design and structural engineering partners, enabling us to confidently undertake projects of any size. Why Choose Us? 1. Pride in Craftsmanship: We take immense pride in our work, ensuring attention to detail in every job we undertake. 2. Driven Workforce: Our team is motivated and committed to delivering excellence, ensuring your project's success. 3. Customer Satisfaction: Your happiness is our priority; we strive to exceed your expectations at every stage of the project. 4. Certified for Security: We prioritize safety and security, ensuring that our work meets certified standards.

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Reviewed by Philip on 31/1/2024

Quick to respond to job request, all work done efficiently and professionally. Have already requested millington construction projects Ltd to return and do another flat roof

Thank you for reading our profile. We have over 20 years experience in all aspects of Roofing, from small repairs to a full new roof. We really do care about all our customers and take pride in our work . We are hard working, punctual and honest.

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Reviewed by Amy on 3/4/2025

Welcome to GJ home improvement your comprehensive flooring and construction solution in Durham. Led by Gareth and his dedicated team, we take pride in offering a diverse range of services to transform your spaces into functional, stylish, and efficient environments. Flooring Expertise: At GJ Floor Screeding, we are your go-to experts for all things flooring. From gas membrane installation to underfloor heating, concrete, dry screed, and wet screeds, we handle it all. Whether you need a complete flooring overhaul or just repairs, our skilled team ensures a flawless finish and durability that stands the test of time. Beyond Flooring: Our expertise extends beyond flooring. GJ Floor Screeding is your partner for a variety of projects, including block paving, decking, bricklaying, and full garden renovations. We specialize in creating outdoor spaces that are as stunning as they are functional. Roofing and Guttering Repairs: In addition to flooring and outdoor projects, we offer roofing and guttering repairs. Our team is well-equipped to handle a range of roofing issues, ensuring the integrity and longevity of your property. Why Choose GJ home improvements Versatility: There's no project too big or too small for our team. From intricate flooring solutions to outdoor renovations, we have the expertise to bring your vision to life. Quality Craftsmanship: We prioritize quality in every aspect of our work, delivering results that exceed expectations. Comprehensive Service: GJ home improvement is your one-stop-shop for a variety of construction needs, providing a seamless and efficient experience for our clients. For all your flooring, outdoor, roofing, and guttering needs, GJ Floor Screeding is here to assist. Give us a call, and let's discuss how we can turn your project into a reality. Thank you for considering us for your construction endeavors. Many thanks, Gareth, and the GJ Floor Screeding team.

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Reviewed by Nicky on 17/4/2024

Great quality work at an excellent price. I was given an accurate quote and work was carried out to a very high standard. I would recommend them to anyone!

We are a small company, specialising in supplying quality workmanship, to customers, all our installers have aquiared many years of experience, this includes electrician, carpenters, painters, floor layers , we specialise in garage conversions, and refurbishment work ,

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Reviewed by Lynne on 10/6/2024

Good communication throughout the process. The job was well done. Premises left tidy. Rubbish collection arranged. I would definately use again.

Electrician at Self employed electrical engineer

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Reviewed by Vicky on 25/8/2024

Came out short notice. Managed to squeeze me in. Due to short notice of getting room plastered 3 days later. Had 4 double plugs put in. In chrome like I wanted. They were professional and cleaned up after themselves. Will definitely use again

J R Griffiths roofing we specialise at 're roofing, slate tiles and leadwork. also chimney work undertook. Rubber roof and also grp

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Reviewed by John on 7/8/2022

Reasonably priced, job completed the next day couldn't ask for anything more.

I have good prices and my prime trade is plastering

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Reviewed by Ramya on 7/7/2025

Outstanding work. Very impressive. Professional work and excellent attitude. Strongly recommended!

Rimi construction limited ! Guaranteed hight quality job with the best prices .

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Reviewed by Deepak on 30/9/2022

Very happy with Rimi. He at all times came up with ideas and solutions. We had a rear garden job. Involved brick work, decking, retiling, soil work,painting, creating new landscape overall. He did it professionally and in time. He was patient with delays in material supply and kept following up. Overall quite pleased with the end result

DMH Group avatar

DMH Group

Cellar & Basement Conversion

DMH Group is a family-run business with over 15 years of expertise in providing comprehensive landscaping and building solutions. Covering a large area in the south east our team takes pride in offering a diverse range of services, catering to all aspects of landscaping and building work. From transforming outdoor spaces into beautiful landscapes to undertaking building projects of varying scales, DMH Group is committed to delivering excellence. No project is too big or too small for us as we strive to bring creativity, quality craftsmanship, and personalized attention to every detail.

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Reviewed by Stephen on 16/6/2025

Plumbing, groundwork and Underground water services At gcb utilities we strive to provide our customers with a high quality end to end service. we know it can be stressful dealing with leaks, repairs and improvements But with our expertise and professional staff we get the job done in good time and with as little disruption to you as possible. From the first contact our friendly staff have you covered. Whether your looking for a leak fixing,you have pressure issues, need pipe work installing or moving, new water supply or external leak repair With our wiaps, chas,constructionline and water safe approval, guaranteed work your in safe hands Give us a call or message for a free no obligation quote

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Reviewed by Graeme on 21/2/2024

Enthusiastic to sort-out our problem. Planned to meet and it happened bang on time. Came-up with the solution and had the job done within their own time estimate.. Problem solved on time and around the estimated budget. Well done!

We want to assure you that you can simply stand by and safely watch your work being completed to the highest quality in the shortest possible time. We have ten years of experience in this line of work. Just send an email or give us a call to get your quote and ask any questions

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Reviewed by Donna on 11/12/2024

Hi I’m Jason p & Darren c Been a master builders for 25+ years worked on grade A listed building to flats cottages semi detached bungalow any building works all come with the standard 7 year guarantee, I’m professional clean tidy tradesman that can put our hand to all trades except electrical & plumbing Customers paramount as word & mouth is very important in the building industry , punctual and always at the end of the phone if needed trust is a big factor also for both the tradesman & the client working relationships work brilliantly, Carpentry work , painting & decorating , rising damp & penetrative damp works , gutter facia eaves installation , cleaning gutters removals everything covered to the highest possible standard achievable Pls allow me to work on your property and showcase my skills many thanks Jason p & Darren c no payments ever made until works completed .

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Reviewed by Antonio on 25/6/2025

Darren did excellent work . Very friendly person , we highly recommend him

We are at your disposal to help you with Leo pop construction property maintenance Ltd We arrange tiling works, gardens, paving and other interior paint?ing and exterior jobs .

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Reviewed by Elliot on 22/6/2025

A pretty good job was done, but they charged a lot of money to say they were only onsite for 3.5 hours. They also didn’t re-sand in between the joists as I would have expected.

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