Business Details
15 Years
experience
Your Trusted Construction Partner in London
Established in 2011, Proficiency Design & Build Design & Build has built a reputation as a leading construction company in London, specialising in high-end residential projects. Our expertise spans basement conversions, loft conversions, house extensions, and full property renovations across London and the Home Counties. With offices in Finchley and Battersea, we provide end-to-end solutions from initial design through to completion, supported by a dedicated team of architects, project managers, and skilled tradespeople.Our commitment to quality is evidenced by our membership with the Federation of Master Builders, comprehensive insurance coverage, and adherence to strict building regulations. We prioritise transparent communication, employing advanced 3D modelling technology to visualise projects and maintain military-grade precision in project management. Our 14+ years of experience, combined with a 100% success rate on planning applications, ensures clients receive luxury results delivered on time and within budget.
Services
Basement Conversions
Loft Conversions
House Extensions
Home Renovations
New Builds
Architectural Design
Structural Engineering
Interior Design
Party Wall Agreements
Planning Applications
Details
- Year established: 2011
Highlights and features
- 14+ years of specialist experience in London's property market
- Dedicated project managers for seamless coordination
- Award-winning design and construction expertise
- Fully insured with Public & Employers Liability cover
- 100% success rate on planning applications
Associations and certifications
- Federation of Master Builders
- NICEIC
- Gas Safe
What people say
Luxury results
On-time delivery
Professional team
Excellent communication
High-quality finishes
Services
Basement Conversions
Transform existing basements or create new subterranean spaces for living areas, home cinemas, or utility rooms. Our process includes structural reinforcement, waterproofing with Delta Membrane Systems, and installation of ventilation and drainage. We handle planning permissions and party wall agreements while maintaining minimal disruption to neighbours.
Loft Conversions
Maximise vertical space with dormer, hip-to-gable, or mansard loft conversions. Our service includes structural assessments, planning applications, and interior finishing to create additional bedrooms, home offices, or living areas while maintaining compliance with building regulations.
House Extensions
Create single or double-storey extensions, wrap-around designs, or side returns to increase living space. We manage full planning applications where required, structural engineering works, and integration with existing property aesthetics for seamless additions.
Home Renovations
Comprehensive refurbishments from kitchen renovations to full house makeovers. Our services include period property restoration, eco-upgrades with energy-efficient systems, and modernisation of layouts while preserving architectural character and meeting modern living standards.
New Builds
Deliver bespoke new-build properties on greenfield or brownfield sites. We provide full architectural design, planning permission support, and construction management with a 15-year structural warranty, specialising in sustainable building practices and luxury finishes.
People
Phil
Contracts Manager
Overseeing initial client consultations and contract preparation, Phil ensures clear communication and agreement terms before project commencement. With extensive industry experience, he manages contractual frameworks and client expectations.
Ric
Architect
Specialising in residential design, Ric translates client visions into detailed architectural plans. He manages planning applications and liaises with local authorities to ensure compliance with London's specific building regulations and conservation area requirements.
Ammar
Project Manager
Coordinating daily project operations, Ammar maintains client communication and schedules. With 10+ years in construction management, he ensures timely delivery and quality control across all project phases.
Jimmy
Construction Manager
Responsible for material procurement and on-site logistics, Jimmy oversees construction execution. His expertise ensures regulatory compliance and quality control during all building phases, from foundations to completion.
Bessi
Site Manager
Managing day-to-day site operations, Bessi supervises teams and ensures health & safety compliance. With specialist knowledge of London's building codes, he coordinates inspections and maintains project timelines.
Questions
What construction services do you offer in London?
We specialise in basement conversions, loft extensions, house renovations, new builds, and architectural design services across London and the Home Counties.
Do you handle planning permissions?
Yes, we manage full planning applications including party wall agreements and listed building consents where required.
How much does a house extension cost?
Typical extensions range from £65,000–100,000 depending on size, complexity, and location-specific requirements.
Are you insured for construction projects?
We hold comprehensive Public & Employers Liability insurance, Professional Indemnity, and Contractors All Risk coverage.
How long does a basement conversion take?
Most projects take 12-16 weeks including planning, structural works, and interior fit-out phases.
Can you work with listed buildings?
Yes, our team has experience with heritage properties and understands the specific planning requirements involved.
Videos
Reviews (5)
Vijay Verma
Jul 31, 2021
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After lot of thinking we selected Proficiency for our new build. Nearly in a week it was clear that we have selected the good builders. House was built in time with professionalism. Jimmy, Besi and Luli are the best team together. They understand clients very well. We thank them to deliver the fantastic job. Highly recommended with full confidence.
Ian Ftaiha
Jul 29, 2021
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We hired Proficiency Design and Build in January this year to build our extension. They were absolutely amazing. January was not a great month in the UK weather wise and also with Covid but these guys were always upbeat, professional, and they worked tirelessly to get the job done.
Toby the project manager was always there to answer any questions and give advice and he came around to check the project every few days which we have never had from any other building company. Besi was the site manager and he worked incredible hard throughout the whole project talking us through it all step by step
Toby the project manager was always there to answer any questions and give advice and he came around to check the project every few days which we have never had from any other building company. Besi was the site manager and he worked incredible hard throughout the whole project talking us through it all step by step
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.
Ron Greenwood
Jul 23, 2021
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Proficiency has just completed the renovation of our flat. We are extremely pleased with their work. It was a multi-trade project , and all elements were carried out with the utmost professionalism. Problems were anticipated and resolved in a timely fashion. As a result we have a high quality finish, completed in time , and within the anticipated budget. There are excellent personnel employed to smooth the process. Thoroughly recommended.
Anne Gruenewaelder
Jun 27, 2021
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Proficiency was recommended to me by friends who were incredibly happy with their work. As a result, I worked with Proficiency on the refurbishment of my flat, including design for an extension, strip out, reinstating the old flooring, complete rewiring, moving & installing new radiators, remodeling the bathroom which included new plumbing, tiling, installing underfloor heating and turning a cupboard into a walk-in shower, as well as decoration of several rooms. This was the first time for me to take on such a project, and I found Proficiency incredibly helpful, reassuring and transparent on both
