Business Details
Expert Basement Conversions in London
OLBC has been delivering exceptional residential construction projects in London for over two decades. As Master Builders specialising in complex basement conversions and historic building renovations, we combine architectural expertise with hands-on craftsmanship to create bespoke family homes. Our team manages a limited number of projects simultaneously, ensuring meticulous attention to detail and direct client engagement throughout the process. With in-house design, conservation, and structural specialists, we offer a fully integrated turn-key service that handles every aspect from initial concept to final interior finishes.Our deep understanding of London's architectural heritage and modern construction techniques enables us to transform period properties while maintaining their historical integrity. Recognised for our technical expertise in challenging projects, we provide comprehensive solutions that include planning permissions, structural engineering, and sensitive restoration work.
Services
Basement Conversions
Listed Building Renovations
Major Renovations
Structural Works
Wine Cellars
Basement Swimming Pools
Heritage Construction
Turnkey Projects
Conservation Projects
Design-Build Solutions
Highlights and features
- We have over two decades of specialist experience in London basement construction
- Our in-house specialists manage all aspects from design to completion
- We limit projects to ensure quality-focused delivery and personal attention
- Technical expertise in challenging subterranean engineering solutions
- Comprehensive insurance coverage including 1m professional indemnity
What people say
Perfect family home
Well beyond expectations
Unbelievably few snags
Help and support
Enthusiasm to create
Services
Basement Conversions
Transform underused basement spaces into luxurious living areas while increasing property value. Our expert team delivers waterproof, structurally sound conversions with bespoke design elements. Specialising in London's challenging subterranean conditions, we create functional spaces like home cinemas, wine cellars, and swimming pools that seamlessly integrate with existing architecture.
Listed Building Renovations
Preserve historical integrity while modernising period properties. Our specialists handle Grade II* and other listed buildings with expertise in traditional materials and conservation techniques. From lime mortar analysis to cornice restoration, we ensure compliance with planning authorities while delivering contemporary living solutions within historic structures.
Turnkey Projects
End-to-end project management from initial concept to final handover. Our integrated approach covers architectural design, planning permissions, structural engineering, and interior finishes. Clients benefit from single-point accountability and coordinated delivery across all project phases, ensuring seamless execution of complex residential developments.
Structural Works
Specialist structural solutions for challenging basement constructions. Our in-house engineering team delivers advanced waterproofing systems and complex foundation works, including projects in waterlogged conditions. Technical expertise ensures durable, code-compliant structures with minimal disruption to existing properties.
Heritage Construction
Expert conservation and adaptation of historic buildings. We combine traditional craftsmanship with modern building science to restore architectural details while improving energy efficiency. Services include sensitive joinery repairs, material matching, and listed building consent acquisition for comprehensive property preservation.
Questions
Do basement conversions require planning permission?
Most London basement conversions require planning permission, particularly for external modifications. OLBC has a 100% success rate in securing necessary consents across London boroughs, managing all applications from submission to approval.
How long does a typical basement conversion take?
Typical projects take 24-36 weeks depending on complexity. Our limited project load ensures focused delivery, with detailed timelines established during the planning phase to minimise delays and coordinate all construction phases.
Is OLBC insured for basement construction work?
We carry comprehensive insurance coverage including £10m employers liability, £5m public liability, and £1m professional indemnity. Our policies specifically cover basement excavation work, with statements provided before project commencement.
What areas does OLBC operate in?
We specialise in London's prime postcodes including Kensington (W8), Chelsea (SW3), Belgravia (SW1X), Wandsworth (SW18), and Wimbledon (SW19), with extensive experience in conservation areas and listed properties.
Can OLBC handle listed building renovations?
Yes, we specialise in listed building conservation with expertise in traditional materials and planning requirements. Our team secures necessary consents and executes sensitive restoration work while integrating modern living requirements.
What is the cost of a basement conversion?
Prices range from £3,000 to £10,000 per square metre depending on specifications. We provide transparent pricing with firm structural costs and detailed fit-out estimates during our initial consultation phase.
Reviews (5)
Pin P.
Dec 19, 2020
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A very straight-dealing company to work with. Always felt they wanted to help us get the most out of the work and were extremely pleased with the results.
Miss Crystaltips
Oct 20, 2020
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Very helpful advice throughout and great knowledge of planning system. We are very happy with the result and would definitely recommend their services.
Roger Caley
Oct 12, 2020
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We were very pleased with the service we received from OLBC from start to finish. We would have no hesitation recommending this company to anyone.
Milly Hill
May 14, 2020
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Great job redesigning the internal layouts of my property, it works much better now. I wouldnt hesitate to recommend them.
Chris Tomlin
Jan 06, 2019
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A very good Historic building company. The head of the team, Rosie and Marc, have a wealth of knowledge
