house extension builders

Extension Builders St James

If you're in need of high-quality building services in St James, look no further than Proficiency Design & Build. Our team of experienced architects, residential interior designers, and local builders have the expertise to bring your house extension visions to life. Trust us to handle all your building needs and bring your dream home to reality.

High end St James extension builders
extend your home

Beautiful St James’s home extensions

If you feel the need to move out of St James neighbourhood or get that extra space simply because you’ve outgrown your house, then an extension would be the viable solution. Whether it’s a loft conversion, kitchen extension, a home office, an orangery, or a basement conversion, nothing should limit your extension dreams. The local builders in St James have the skill and craftsmanship to deliver what you want. Not forgetting their years of experience! You only need to see some of their completed projects in Fulham, Putney, and Richmond to tell that they’re indeed the right team.

Bespoke home extensions
property extension
Luxury extension in St James

Design and Build Service

Beginning-to-end building company

Getting a professional team of builders that walks with you through every step of the construction project is an important thing for every homeowner. Whether you just want to improve your home’s value or have an extension on your property, the recommended builders in St James have the skill and expertise required to guide you throughout your project. The dedicated project manager selected ensures efficient project management. Not to mention the commitment to quality of the St James builders.


open plan kitchen extension
The Avenue, Queen's Park

Rear and side extension
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navy blue kitchen
Islington, Canonbury

Rear Extension
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Cambridge Road, Twickenham

Extension & Loft Conversion
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Hillfield Road, West Hampstead

Wrap Around Extension
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Home extension cost

With the extension builders in St James, delivering value and ensuring customer satisfaction is a priority. You get a team that works within your budget hence you don’t need to worry about any unnecessary costs that you may incur. The size of the project and design you want are among the few factors that are likely to influence the cost of your project. With this team of builders, all projects are given the same care and attention regardless of the size. You get value for your money upon completion of the construction project.

Construction services

Equipped with years of experience and the expertise and skill required, you get a professional team to handle your project from the start to finish. From quantity surveyors, structural engineers to interior designers. You get contractors that are NICEIC approved and a team that’s FMB fully insured for your peace of mind. Upon completing the project, you receive a completion certificate and a 15-year structural guarantee.

Building a room

Get in touch with our team of builders in St James.

From kitchen extensions to complete home renovations, call us today to get free advice and guidance regarding your extension project. You get professional consultation from our experts.


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