Business Details
15 Years
experience
Luxury Home Extensions London
Established in 2011, Proficiency Design & Build Design & Build has emerged as a leading construction company in London, specialising in high-end residential transformations. Our expertise spans loft conversions, basement conversions, house extensions, full property renovations, and new build projects across London and the Home Counties. With offices in Finchley and Battersea, we provide end-to-end solutions from initial concept to final completion, combining architectural design, structural engineering, and construction under one roof. Our team of dedicated professionals, including architects, project managers, and skilled tradespeople, ensures every project meets exacting standards of craftsmanship and client satisfaction.We maintain full insurance coverage through the Federation of Master Builders and adhere to strict safety and quality protocols, including NICEIC and Gas Safe accreditations. Our commitment to transparency, military-grade project management, and use of premium materials guarantees results that exceed expectations while respecting budgets and timelines. With a 100% success rate on planning applications and a 15-year structural warranty on completed projects, we offer unparalleled peace of mind to homeowners seeking luxury transformations.
Services
Loft Conversions
Basement Conversions
House Extensions
Renovations
New Build Projects
Interior Design
Structural Engineering
Planning Applications
Project Management
Details
- Year established: 2011
Highlights and features
- 14 years of specialist experience in London's property market
- Dedicated project manager for every client
- 100% success rate on planning applications
- Fully insured with comprehensive liability coverage
- 15-year structural warranty on completed projects
Associations and certifications
- Federation of Master Builders
- NICEIC
- Gas Safe
What people say
Luxury results
On-time delivery
Professional team
Quality finishes
Transparent communication
Services
House Extensions
Transform your living space with our bespoke house extensions. Our expert team delivers single-storey, double-storey, wrap-around, and side return extensions across London. Combining architectural innovation with structural engineering excellence, we create seamless additions that enhance property value and functionality while maintaining compliance with local planning regulations.
Basement Conversions
Maximise your property's potential with luxury basement conversions. Our specialists handle complete excavations, waterproofing, and structural reinforcement to create entertainment spaces, home gyms, or additional bedrooms. We manage all planning permissions and party wall agreements while ensuring complete compliance with building regulations and environmental standards.
Loft Conversions
Create valuable living space with our premium loft conversions. We specialise in dormer, hip-to-gable, and mansard conversions that maximise head height and floor space. Our comprehensive service includes structural calculations, planning applications, and interior finishing to transform unused roof spaces into functional living areas with full building control certification.
New Build Projects
Realise your vision with our luxury new build developments. From greenfield sites to brownfield regeneration, our architects and builders deliver bespoke residences with meticulous attention to detail. We manage every phase from feasibility studies and planning permissions to final finishes, ensuring compliance with all building regulations and sustainability standards.
Full Property Renovations
Comprehensive property renovations that redefine living spaces. Our team handles complete structural upgrades, kitchen and bathroom remodelling, and period property restorations. We combine modern functionality with traditional craftsmanship while managing all necessary permissions and ensuring minimal disruption to homeowners throughout the renovation process.
People
Phil
Contracts Manager
With over a decade of construction industry experience, Phil manages client relationships from initial consultation through to contract signing. He ensures clear communication and transparent project planning for all Proficiency Design & Build developments.
Ric
Architect
Ric leads architectural design, translating client visions into detailed plans. His expertise in London planning regulations ensures successful applications for complex extension and conversion projects across the capital.
Ammar
Project Manager
Ammar oversees project execution, maintaining strict timelines and quality standards. He coordinates all stakeholders to ensure seamless delivery of Proficiency Design & Build's construction projects from contract signing to completion.
Jimmy
Construction Manager
Jimmy manages material procurement and on-site operations, ensuring compliance with safety regulations. His leadership guarantees efficient construction processes and adherence to technical specifications.
Bessi
Site Manager
Bessi supervises daily site operations, managing logistics and subcontractors. She maintains health and safety standards while ensuring project milestones are achieved according to schedule.
Questions
What areas do you cover?
We operate across London and the Home Counties, including North London, South London, and surrounding boroughs.
Do you handle planning permissions?
Yes, our team manages all planning applications and party wall agreements for extensions and conversions.
Are you insured?
We maintain comprehensive insurance through the Federation of Master Builders, including public liability coverage.
What's included in your warranty?
All projects include a 15-year structural warranty and compliance certificates for gas, electrical, and building control.
How long do projects take?
Timelines vary by scope but average 6-12 months for major renovations, with detailed schedules provided upfront.
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Reviews (4)
Babita Singh
Jul 27, 2021
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Positive:Quality
Delivered on time and we got the specification we asked for. Professional and responsive to our needs. Builders on site were always professional, neat on the job and enjoyed what they did.
Delivered on time and we got the specification we asked for. Professional and responsive to our needs. Builders on site were always professional, neat on the job and enjoyed what they did.
Laura Macara
Jun 23, 2021
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We undertook a big project demolition of an old extension, double floor extension, garage conversion, internal remodelling and full refurbishment including re-plaster, re-wire and re-plumb. We were complete novices so spoke to 6+ different building firms to get quotes, and Proficiency were the most impressive from the start. Their dedicated contract manager Phil worked with us in detail which is what we wanted, always giving quick responses and never pushing us to just get started and worry about the details later, which is what we experienced with some other firms. Having Phil manage the quoting
Archie Stebbings
Mar 16, 2021
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We worked with Proficiency for a full conversion of our apartment, including glass extension, garden remodelling, reorienting of floorplan to create two bedrooms, full refurbishment and redecoration. Proficiency also supported with elements of design and re-drawing given we were unhappy with the services of our architect. In particular, I would call out their transparency on cost throughout, providing regular updates and itemisations to ensure there were no surprises at the end of the job. I would not hesitate to recommend this company - at all times they were responsive, professional and went
Sally Lipsius
Dec 14, 2020
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Besi , Toby and and the team were so helpful. I wish I had started my job with their architect who helped me sort out the mess that my original architect had left me in. And so it continued, they were always helpful, offering up creative solutions, going above and beyond and provided such a high quality of work. And fast too! Just amazing. I will definitely use them again for anything I need doing and can't recommend them enough.
