Basement Design and Conversion in Hounslow & West London
Turn your unused cellar or basement into a bright, dry and
comfortable living space. ERD Ltd looks after the design, planning
support, waterproofing and build under one roof, so you work with
one team from the first sketch to the final coat of paint.
Free, no-obligation quotations Design-to-build service
Skilled in-house tradesmen Planning & architectural support
Add living space without moving house or losing your garden
A basement is often the most underused part of a home. With the right
design, it can become a home cinema, guest suite, home office, gym or
even a self-contained living area, without building upwards or giving up
outdoor space.
Our basement design service covers everything from converting an
existing cellar into a habitable room to creating a brand new basement
beneath your property. Many homeowners in Hounslow and across
West London choose a basement conversion instead of moving,
because it adds useful floor area and can add value to the property.
Every project starts with a survey of what you already have, so the
design is practical, safe and built to last
Cellar & basement conversion
Already have a cellar or basement? We convert it into a dry, warm, well-lit habitable room with damp-proofing, insulation, lighting, flooring and finishes.
New basement extension
Create an entirely new level below your home. This involves careful structural design, excavation and underpinning, and usually needs planning approval.
Lightwells & natural light
Lightwells, rooflights and glazed openings bring daylight into lower floors, so your basement feels like part of the house, not a bunker.
What can you use a converted basement for?
Good basement design starts with how you want to live. These are the layouts our clients ask for most.
Home cinema & games room
Naturally quiet and dark, a basement suits a media room with acoustic insulation and built-in lighting.
Guest bedroom & en-suite
A private bedroom with its own bathroom, ideal for visitors, teenagers or relatives.
Home office or studio
A calm workspace away from the main living area, with proper lighting, power and data points.
Home gym & spa
Durable flooring, ventilation and space for equipment, a sauna or a steam room.
Kids’ playroom
Keep toys and noise out of the main living space with a safe, warm room of their own.
Wine cellar & storage
Stable temperatures make basements ideal for wine storage and organised, dry storage.
Self-contained annexe
A separate living area for family or rental use, subject to planning and building regulations.
Why Hounslow homeowners choose ERD Ltd
One team for design, build and finishing
Complete design-to-build
Planning, architecture, construction, electrical and interior design, all coordinated in-house.
Skilled tradesmen
Professional, honest and competent people who care about workmanship and tidy sites.
Competitive pricing
Efficient project management and honest quotes, so you get real value for your investment.
Clear communication
We listen first, explain your options plainly and keep you informed until the project is closed out.



