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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.

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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

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
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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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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.

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All Plumbing, Heating, Gas and Renewable energy work undertaken. Cistern repairs Tap replacement Radiators Bathrooms Burst pipes Blocked drains. Gas safety checks, gas servicing and repairs. Boiler installation and repairs. Air source heat pump installation and servicing.

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Reviewed by Derek on 27/8/2026

We are new to rated people but we have been established 32 Years, we are a small company specialising in extensions and kitchen and bathroom refurbishments. We cover all types of work from brick work repairs to painting and decorating. We fit plastic windows and doors and are Fensa registered We give free prompt estimates with no hidden extras.

Hi,My name is Andy & my company is Fiveways Contractors. We are builders who carry out house extensions, lofts conversions, structural work & full house refurbishments. Check us out on our website. For a builder you can trust, Fiveways are a must. Andy

House Extensions, Loft Conversions and Renovations Specialists

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Reviewed by Umeet on 9/1/2021

We have found drainage problems which the insurance company will not honour due to incorrect installation during this project. This has cost us dearly.

Hi my name is Tom I’ve been plastering for 20 years. I provide a clean helpful service and i do my up most to meet customers requirements

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Reviewed by Catherine on 7/7/2021

Tom came to skim my son's ceiling but because it had old artex and very uneven he decided to put a false ceiling in, board that and then skim it. Tom is a really friendly guy, kept showing me where he was up to in the job and was very tidy and did a great overall job at a good price. Wouldn't hesitate to use Tom again or recommend to friends and family.

All aspects of building and refurbishment work are undertaken

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Reviewed by joe on 23/11/2023

Came and surveyed job but never came back with a quote

We are one of the best building and renovation company in London since 2011. Our experience taken over many years and different architects helping us to provide a service meeting the highest quality standards in every detail, making our homes and city beautiful...

It's all about the fine finishes.

We are a medium sized Home Improvements company who have been trading for around 11 years as of 2019. An excellent 5-star reputation has been earned through quality work done on a friendly, but professional basis- most of our work is now coming through recommendations.We can cover most types of jobs: From Architectural plans etc / Building / Roofing / Glazing/ Joinery / Electrical / Plumbing / Rendering / Plastering / Decoration- a complete service which a lot of customers are looking for.We work very hard on the personal service side of things including the project management from myself.Our aim is simple: to give the customer a first- class job which in turn leads to my name being passed on plus being asked back for further work.Thank you for looking at us.

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Reviewed by Baraq on 28/2/2025

At Forest Moor Projects, we are dedicated to providing high-quality plastering services throughout Yorkshire. With our expertise and attention to detail, we can transform any space into a work of art.Whether your project is residential or commercial, choosing the highest quality plastering and rendering services in Yorkshire can significantly enhance your property. With skilled professionals, you can achieve a beautiful and durable finish that stands the test of time. Steel RSJ Supporting Walls Creating New Spaces from Plans to Design When it comes to transforming your property and creating new, open spaces, steel RSJs (Rolled Steel Joists) are an essential structural solution. Whether you're removing walls to open up rooms or reconfiguring areas to match your design plans, RSJs provide the strength and stability required to support the remaining structure. From initial planning and structural calculations to the seamless integration of RSJs during construction, we ensure every step is handled professionally. Our expertise ensures that your vision is brought to life safely and efficiently, giving you the perfect balance of form and function for your newly created space

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Reviewed by Carole on 4/8/2026

Brilliant. Great job. Tidy. Quick. And friendly guys to boot!

Elliott fencing and landscaping has been in the building trade for 15+ years now. Our trade varies from Fencing to landscaping and for the best part of 10 years we have been laying patios/driveways etc.

Calvin avatar

Calvin

Cellar & Basement Conversion

family run bussines myself Kenny maccallum and two sons 34 yrs experience working self employed and contract work for other firms just finished working as general foreman and project management for past four years back working for myself fairtrades reg

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Reviewed by Rachel on 9/7/2026

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.

Pearlcontracts is a small firm based in Montrose Angus with two teams of professionals for your home improvements.

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Reviewed by Avril on 17/12/2020

First class job by John and the guys. Turned up on time to view the job, very knowledgeable and thorough assessment. Work completed to our agreed timescale and to a high standard, photos supplied to show before/after, important on a roof! Reasonably priced and very pleasant. Would highly recommend - in fact just had them back to do some more work.

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Reviewed by Rob on 20/7/2022

Carried out some structural work on the front of my house after a really competitive quote. Arrived when stated and completed the job in two days. Very professional company and did a great job. Would use again.

????? Service Introduction – Carpentry & Roofing STANART Construction Limited Hi! My name is Stan ,and I lead a skilled and reliable team with 12 years experience in carpentry and construction work We provide complete, high-quality services for both small and large projects, indoors and outdoors. Our specializations include: ?? Carpentry work – doors, windows, stairs, custom furniture, terraces, pergolas, wardrobes ?? Roofing – full roof installation, repairs, renovation, timber framing, tiles/shingles, gutter systems ?? Organized, well-equipped team – ready to handle complex projects to a high standard ?? Punctual, clean work and clear communication throughout the job CSCS Level 2

Scott avatar

Scott

Cellar & Basement Conversion

We are builders based in co derry , we travel from county to country to work for the right clients , building relationships and long term partners ... Throughout the uk and ireland .. We have vast knowledge in house building groundworks ,underpinning ,renovations ,extentions ,complete refurbs ,medium size sites with the right investors .. Profile is in the making .. pictures references will be in coming weeks as new to this

We specialise in structural works, underpinning, steelwork and basements. Our experienced team are also experts in damp control, waterproofing and tanking solutions and all our work is guaranteed, offering our clients complete peace of mind.

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Reviewed by Lisa on 9/3/2023

We had a retaining wall fixed in our basement. Kevin was great at communicating and helpful with the issues we had. The team working were great, polite, and kept the place clean and tidy each day. Very reliable. Thanks!

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