Basement Conversions
in Westminster
Unlock the full potential of your property by converting an unused basement or cellar into a bright, functional living space. From home cinemas and gyms to self-contained annexes, we manage every stage of the conversion, including waterproofing, structural work, and finishing.
Westminster, London residents near Marylebone High Street trust us for basement conversions that's planned, priced and delivered properly.
Unlock the full potential of your property by converting an unused basement or cellar into a bright, functional living space. From home cinemas and gyms to self-contained annexes, we manage every stage of the conversion, including waterproofing, structural work, and finishing.
why Convert Your Basement?
Basement conversions are one of the most effective ways to add substantial living space without extending your home's footprint. Whether you want a media room, an extra bedroom, a home gym, or additional storage, a well-designed basement conversion adds real value while making use of space you already have.
Waterproofing & Structural Work
Every basement conversion starts with a full structural and damp survey. We install certified waterproofing systems, manage underpinning where needed, and ensure ventilation and drainage meet current building regulations, so your new space stays dry, warm, and safe for years to come.
A complete service, carefully coordinated.
Every basement conversion we carry out includes the following as standard.
ructural and damp survey in Westminster
Waterproofing design and installation (Type A/B/C systems) in Westminster
Building regulations drawings and applications in Westminster
Excavation and underpinning where required in Westminster
Insulation, plastering, and electrics in Westminster
Ventilation and drainage systems in Westminster
Staircase design and installation in Westminster
Full project management from start to finish in Westminster
Scope and specification are confirmed before work begins, so you have a clear understanding of what is included.
Discuss Your RequirementsHow It Works
A clear, step-by-step process so you always know what's happening and when.
Step 01
Free Consultation
We assess your basement or cellar, discuss your goals, and provide an initial feasibility report.
Step 02
Survey & Design
A full structural and damp survey, followed by detailed drawings and waterproofing design.
Step 03
Fixed Quote
A clear, itemised quote covering excavation, waterproofing, and finishing works.
Step 04
Construction
Our team carries out excavation, underpinning, waterproofing, and fit-out, with a dedicated project manager throughout.
Step 05
Sign-Off & Handover
Final building control sign-off and a full walkthrough of your new space.
Providing basement conversions services across Westminster, London.
04
Postcodes served
02
Neighbouring boroughs
Local to
Westminster
Serving Marylebone, Pimlico and Fitzrovia, with the discretion and site management standards expected in central London.
Much of Westminster’s housing near Marylebone High Street and Pimlico is Georgian townhouses and grand mansion blocks, which shapes how we approach basement conversions here — from access and parking to how a property needs to be protected during the work.
Postcodes we serve
Also covering nearby
Covering Westminster, London and the surrounding area — get in touch to check we cover your postcode.
Frequently asked about basement conversions
In most cases, converting an existing basement or cellar doesn't require planning permission, as it's typically classed as a change of use. Excavating a new basement is more likely to need approval. We'll confirm what applies to your property.
Most basement conversions take between 8 and 14 weeks, depending on the scope of excavation and waterproofing required.
We install certified waterproofing systems designed to meet British Standard BS 8102, with drainage and sump pumps where needed to keep the space permanently dry.
Let's talk about your basement conversions needs.
Service Enquiry
Basement Conversions
Ready to Transform Your Basement?
Get in touch today for a free, no-obligation survey and quote for your basement conversion project.