The quick way to find a local Cellar & Basement Conversion specialist in Northolt

Castle Wren

Cellar & Basement Conversion

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Castle Wren are a progressive and versatile construction business. Operating from the heart of Bishops Stortford on the Herts and Essex border, we work across the Home Counties, London and East Anglia. We continually strive to maintain our strong reputation for quality, and we have long standing partnerships with many of our clients with much of our work being repeat business. Our experienced and dedicated team cover all types of projects ranging from demolition and site clearance to new build housing schemes, commercial buildings or refurbishment projects. Private clients are an important part of our business, and we work with customers to bring their dreams to life, be that with a new extension, landscaping and garden transformations, patios and driveways or the end to end delivery of a new home. We have deep specialisms in demolition, groundworks, earthworks, and civil engineering projects and work with a wide range of clients, from private customers to national developers and housebuilders.

Latest homeowner review

Reviewed by Alan on 2/5/2024

After visiting my property, I was initially impressed by the gentleman who promised to quote, but have since heard nothing, in spite of more than one request to get back to me. Very disappointed

Next Level Construction

Cellar & Basement Conversion

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Nextlvl Construction (London) We carry out renovations, extensions and building work across London and nearby areas. We’ve been trading for 7+ years. We focus on jobs being: properly planned kept tidy finished to spec done with clear pricing and communication What we do: Extensions & conversions: lofts, basements, garages Renovations: full refurbs, layout changes, structural work Kitchens & bathrooms: rip-out to finish, including plumbing and electrics Carpentry & joinery: fitted units, doors, stairs, custom work Roofing & exterior: flat roofs, fascias, soffits, cladding Finishing: plastering, tiling, flooring, painting and decorating Security & tech: CCTV, alarms, AV installs Cleaning: post-build and end of tenancy How we work Written quotes with a clear breakdown Realistic timelines and updates as the job progresses Site kept tidy and waste cleared Building regs considered from the start Snagging handled properly before sign-off If you’re planning work, we can take a look and provide a free quote. - Fully insured. - References available. - Before and after photos of recent work available on request. - We can work to drawings or help you plan the build. - We’re used to working in occupied homes.

Beauchief Building and Electrical Services

Cellar & Basement Conversion

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We have been in business for over 20 years and pride ourselves in complete design and build, project management with good communication and an eye for customer satisfaction. We carry out works from New builds to lofts, extensions to refurbs with a specialist Bathroom operation which we carry out all year

Latest homeowner review

Reviewed by Paul on 29/8/2023

Julian at Beauchief was both professional in his approach and diligent in his work. Communication was very good both talking through the job / options and during, with regular photos updating progress. I would have no hesitation in using him again.

SSmart Build

Cellar & Basement Conversion

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We are ssmART Build & Design Ltd. Our team pride themselves on We are ssmART Build & Design Ltd. Our team pride themselves on their diligence and painstaking attention to detail. We are a seasoned team of quality builders who have been helping homeowners London area for some time. We have an experienced and disciplined team who have completed many projects throughout our area of operation; indeed we can help you complete all types of home improvements and extensions/conversions. We pride ourselves on our impeccably high standards and always strive to deliver on time and within budget. We can help with all of the following and more: • Extensions (both single and double storey) • Loft Conversions • Basement Conversions • Garage Conversions • Kitchens • Bathrooms and wet rooms • Exterior and Interior painting and plastering • Plumbing, electrical work and carpentry • Annexes • Replacing both wooden and PVC doors and windows We are always delighted to meet our prospective customers face to face to discuss their requirements. We look forward to hearing from you soon.

Latest homeowner review

Reviewed by Florin on 15/7/2019

I found Lorand to be very professional in his craft ,friendly individual and very reasonable priced. I would highly recommend his work in extensions,brickwork etc.

High Blue Builders

Cellar & Basement Conversion

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High Blue Builders are a team of highly dedicated and experienced professionals with a passion for the built environment and a proven track record of delivering successful projects of various scales. Be it an extension, refurbishment or a large scale new build development, we take pride in delivering projects tailored precisely to match the vision of our clients. High Blue Builders have an in-house RIBA Chartered Architect who has vast experience in producing effective conceptual and detailed designs that are most likely to achieve planning consent. We can also take complete responsibility of your planning application and can provide insightful industry guidance to help you maximise the potential of your site. Furthermore, we are very experienced in engaging with local councils, Building Control (complying with building regs), party wall surveyors and managing stakeholders of sites such as neighbours and pedestrians. Our management ensures each project is delivered as smoothly and efficiently as possible. No project is too large or small for High Blue Builders and we strive to provide an outstanding quality of service at the most competitive rates.

CONSTRUCTABUILD LTD

Cellar & Basement Conversion

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At ConstructaBuild, we connect residential clients with trusted, vetted builders for all their home improvement projects — from kitchens and bathrooms to extensions and loft conversions. Our commitment is to ensure top-quality workmanship and safety, giving you peace of mind every step of the way.

Keno Construction

Cellar & Basement Conversion

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We are a trusted construction company with over 12 years of experience specializing in driveway installation, landscaping, and foundation work. Our team is dedicated to delivering high-quality craftsmanship, reliable service, and long-lasting results for residential and commercial properties. From custom driveways and outdoor landscape transformations to strong, durable foundations, we complete every project with professionalism, attention to detail, and a commitment to excellence. Using quality materials and proven construction techniques, we ensure every job is completed on time, within budget, and to the highest standards. Customer satisfaction is our priority, and we take pride in building lasting relationships through honest work and outstanding results.

GJ Building Solutions

Cellar & Basement Conversion

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As a building We strive to make customers happy ur work speaks for itself we trie to offer all our clients the best advice and services all or callout are absolutely free advice and we do not charge for inspections this is just another way to give ? people peace of mind To choose GJ building solutions?

Latest homeowner review

Reviewed by David on 11/1/2025

James and Andy provided excellent advice and did a great job. The job revealed some extra work was needed but the changes were all discussed and agreed without pressure before being implemented and James was able to bring in extra team members whilst on site so the work was completed in a timely fashion. All of the team were personable and a pleasure to have on site.

Ionut Covaci

Cellar & Basement Conversion

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“Versatile and detail-orientated” are words that have been used to describe us! With over 9 years experience of delivering outstandingly presented rooms for residential and commercial clients. A knowledgeable professional with expertise in fulfilling decorative needs for contractual clients and working on-site to provide all maintenance needs for commercial locations. Adept at executing high standards of painting and decorating through applying exemplary wall coverings knowledge and ensuring all surfaces are perfectly smooth through effective plastering and filling. Most importantly, customer-focused and committed to delivering all aspects of the customer brief.

THE GCD GROUP LTD

Cellar & Basement Conversion

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GCD Developments is a multi-disciplinary property practice, covering property development, project management, architecture and interior design across London and United Kingdom. Whilst every project is unique, the philosophy behind each is unwavering: at GCD we strive to craft environments which are not just beautiful, but faultlessly functional.

KP GENERAL BUILDERS

Cellar & Basement Conversion

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General Building ,Refurbishment,renovation Activities.,Established 10 years ago, experience on the domain for 15 years .

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Reviewed by Brenton on 21/1/2026

Nas Afroun

Cellar & Basement Conversion

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bathroom and kitchen fitters/flooring/extension/loft conversion/fencing etc.... all work guaranteed

Oliver Deyoung

Cellar & Basement Conversion

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"with 20+ yrs of experience I pride myself on delivering high quality maintenance projects on time and within budget. Contact me today and see how i can help you to complete your projects as you imagine, regardless of size big or small"

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Reviewed by A on 31/1/2026

Mill House LTD

Cellar & Basement Conversion

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Honesty, good workmanship , 40 years as a contractor, helpful, nothing is too big or too small, no over pricing, London based. Knowledge of all property aspects, including laws and management, politeness and total respect to our clients, and their properties You will not be disappointed

NWL RENOVATIONS LTD

Cellar & Basement Conversion

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NORTH WEST LONDON RENOVATIONS is a well established, trustworthy, reliable and professional company. We serve Acton, Ealing, Hammersmith, Kilburn, Paddington, Brent, Westminster, Hampstead, West Hampstead, Primrose Hill and all surrounding areas of N, NW and Greater London. Our service is professional, caring, and high quality. Our customers rate us highly for our ability to stick to deadlines, and for the quality of our workmanship. We provide a professional service from the initial free quotation to the end professional finish. Our service is friendly, clean and tidy, and reliable. We consider no job as too large or too small and offer very competitive prices

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Reviewed by Nicholas on 2/2/2024

Had scaffolding up very quickly. Started job on time and finished in a week. Very impressive. Good communications and reasonable price.

Vasile Alexandrescu

Cellar & Basement Conversion

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Hello,I am Vasile! If u need any type of building work to be done please feel free to contact me and u will have Free quotes and good advice! Thanks and see u on the job!

Latest homeowner review

Reviewed by Dan on 23/4/2019

Vasile and his team are working to a very high standard on tenant rental bathroom, made several recommendations on how to improve plumbing, fitted 15mm copper piping and large number of other improvements including carpentry and electrical wiring to best working guidelines, good job and a fair price, thank you