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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.

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

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.
We are a family run business with experience in all aspects of Building, roofing & home improvements. working around Newport and the surrounding area's. We provide a fast and professional service at competitive rates. No job too small, call now for a free quotation, partner to ( shield roofing specialists south wales)
We undertake all building work but specialise in joinery
Carpentry (Certified Fire Door Installer/competent person) Electrical and general builder
At The Ruby Team we value great work and our word. Reliable, trustworthy and punctual tradesmen is what we are. With fantastic quality of work and enthusiasm we really get the job done to a 5* level. With 7 years in the field as a multi-tradesman I’ve accumulated a lot of knowledge in many sectors. No job is too small nor too big for us and we cover all areas in London and Essex. We follow a CLAYGO service which is a protocol we follow to ensure your house is as clean as when we entered it. #Residential. #Commercial. #Landscaping. Terms & Conditions. Any job cancelled by client with less than 48 hours notice will be subject to a flat £65 cancellation fee which is due when cancellation is confirmed. Payments are due on completion and once customer is satisfied with the quality of workmanship. If customer is not satisfied, it will be resolved with snagging or discount.
Time - Served Joiner Advanced Craft 43 Yrs Experience All aspects of joinery Fire Door Installation Plasterboarding Approved Fitter Wren Kitchen & Fitted Wardrobes - B&Q /Wickes
Ernie is a really pleasant guy, his work is of a high standard and he is very reliable ...we will be contacting Ernie again for more work throughout the house. Highly recommend
Electrician at Self employed electrical engineer
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
Welcome to Certified Group Limited, We are a sister company to Certified Gas Heating Ltd. Started of as a dedicated and driven apprentice who started working within the plumbing trade from the age of 15. Established in 2012, We are a fast growing company accommodating your plumbing, heating and gas utilities effectively. Over the years we have started to offer other services which include: Electrical, renewables, drainage, carpentry, roofing, property renovations and kitchen extensions hence the reason for the name change as it fits our image at present. We at Certfied group are known for being professional, organised and enthusiastic at all times. We are approved contractors rated a “5 Star company for quality services” on Which Trusted Trader, Trust Pilot and other platforms. We at Certified group have a fantastic reputation for our hard work, performance, quality and efficiency. We are based in Greenwich SE10 London and cover whole of the capital and surrounding areas. We offer a 24/7 emergency services, Landlord safety certificates, Central heating and boiler installations, Breakdowns, Repairs, Power flush and more.
Great experience with Aziz and team. They provide lots of advice and a detailed quote before starting any works. The work was quick and efficient and they were super tidy throughout the whole process. All works were completed to a high standard and we are so happy with our newly installed radiators. Thanks again for the amazing effort
Solutions for carpentry, design and build. Corrective and repair work. Assessment free of charge. Experienced and knowledgeable. Professionally managed. Insured. Reasonably priced. Also specialise in all door supply and fitting. I look forward to talking about your requirements.
Brilliant work! We were so pleased with Jon's workmanship and professionalism from start to finish! We are looking forward to working with him again and would not hesitate to recommend to others!
MR roofing and building. Over 20 years roofing and building experience we pride ourselves on quality work at a high standard. We specialise in all aspects of roofing and building maintenance/repair. We are a honest and reliable company and take great pride in every job we do. The type of work we normally do is tile and slate roof repairs, flat roof repairs,chimney repairs, Lead flashings, guttering,fascia and soffits. All aspects of bricklaying, pointing, internal reconstruction, installing lintels, structural reinforcement, opening up and blocking up fireplaces,flagging, Rendering, plastering. All work done by a experienced qualified tradesmen. No job is too small. •Qualifications. Fully qualified NVQ2 bricklayer. CSCS card holder. Construction skills certification scheme. Time served roofer. City and guilds in •Engineering craft studies. • Mechanical production. • Industrial studies. • Material removal. • Joining. • Assembly and dismantling.
Hired to fix my guttering and they have done a brilliant job, they came to check and work out what the problem is and gave me a reasonable quote, they arranged a date and time to carry out the work and the leak and guttering issues are completely gone. Would highly recommend.
Hi we do from one slate or tile too full re roof flat roofs garage roofs all upvc fasica boards soffit boards guttering and down pipes all tree work plus waste removals plus much more
We take on most of interior house jobs.Including kitchen and bathroom fit.Plumbing,flooring,painting. Carpentry jobs.All small jobs also considered. Home maintenance and handy jobs. We do Plastering as well as exterior render and painting.
A joiner by trade but an experienced tradesperson in a number of home related areas including kitchens, bathrooms & maintenance
Fast, professional and friendly. Recommend
First Fix Joinery Solutions is based in Hamilton , South Lanarkshire. We carry out all aspects of joinery and building works from small jobs no one wants to full renovations. We cover the whole of Scotland. No job is too small or too far away.
Hi welcome to Newman & sons. We're a family based company from Berkshire & also covering the south of England specialising in high quality new builds/refurbishing/emergency repairs/industrial roofs. For over 40 years. Specialist in Roof cleaning/roof repairs / new roofs. Gutters/ upvc Facias/chimneys. We also carry out industrial roofing. We're LABC REGISTERED & only use good quality materials & family tradesmen to get your work done. All quotes are free & no obligation /insurance /emergency. Please call even if it’s just advice. We’re more than happy to help.
I
Hi im James I run an established Garden an Landscaping company, I have 17 years experience, I Design and Build Gardens. take a look through my photos to see what I do. I pride myself on great communication skills. Based in North London
James and his team were brilliant - punctual, neat and very nice, and they have transformed our back garden with great work and lovely ideas. I would really recommend them.
A professional qualified insured family run business who puts their customers first
Friendly, professional, knowledgable, good job done
All brickwork,slabbing,steps,monoblocking,fencing & drainage.All landscaping and garden design.I have 40 years of experience,and have never left a customer unhappy with my work.I will offer the best advice for the job in hand.
James was great. Our fence was wrecked in a storm, James came out day after logging the job, turns out we needed a customised fence panel. He arranged this and had completed the job within 48 hours, also tidied up and removed old fence. Would definitely hire again!
My name it’s Cris. I am a person with many qualities in handyman.What a handyman means? A handyman, also known as a handyperson or handyworker, is a person skilled at a wide range of repairs, typically around the home. These tasks include trade skills, repair work, maintenance work, are both interior and exterior, and are sometimes described as "side work", "odd jobs" or "fix-up tasks". For me a handyman means the person who helps the people who are in need or not having the necessary training for that thing and at the same time the one who later gives a smile to the people's face. For this, please contact me in any need you have
Christian and his team were friendly, courteous, and did a great job at the quoted price with no surprises.
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.
Dear Customers IE-DESIGN with years of experience offers interior and exterior work such as painting and decorating.We also undertake and manage landscaping and gardening services of any kind. Additionally our experience leads to the unique 3D projects if required. We can promise a competitive price and perfect finish as Customer satisfaction is at the heart of everything we do.
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