House Extensions
Across London
Add space, add value and transform the way you live — with a professionally managed extension built to the highest standard.
Get a Free QuoteMore Space.
More Value.
Done Properly.
A well-designed and well-built extension is one of the best investments you can make in your property. Whether you're looking to extend your kitchen, add a side return, create a ground floor bedroom or build above an existing structure, we manage the entire process from start to finish.
We handle the groundwork, structure, heating, electrics, plastering and finishing — all coordinated by one team so you never have to juggle multiple contractors. Clear communication, honest pricing and quality workmanship throughout.
Rear & Side Extensions
Single and double storey rear extensions, side returns and wrap-around extensions tailored to your property.
Full Structural Works
Foundations, steelwork, brickwork and roofing all handled by our experienced team and subcontractor network.
First & Second Fix
Electrics, plumbing and heating fully integrated into the new space — no need to hire separate tradespeople.
Plastering & Finishing
Full internal finish including plastering, painting, flooring and joinery to match or complement your existing home.
Building Regulations Compliant
All work carried out in full compliance with Building Regulations — fully insured and documented throughout.
Why Choose FS Construction Group
One Team, Every Trade
We coordinate every aspect of your extension — no juggling multiple contractors, no miscommunication, no delays.
Transparent Pricing
You get a clear, itemised quote upfront. No hidden costs, no surprise invoices — just honest pricing from day one.
Fully Insured & CIS Registered
Your property and investment are fully protected throughout the build. We operate to the highest professional standards.
On Time, Every Time
We set a realistic programme at the start and we stick to it. Your time matters and we respect that.
Contract Management Expertise
Our background in professional construction management means your project is run efficiently from the very first day.
Quality Without Compromise
We take pride in every job we deliver. High standards are non-negotiable — no matter the size of the project.
Thinking About an Extension?
Get in touch today for a free, no-obligation quote. We'll visit your property, talk through your ideas and give you a clear, honest price.