Trusted Builders in London For All Your Building Needs
Alpha London Builders delivers everything from new builds and loft conversions to house extensions and full refurbishments across London. With one dedicated site manager, clear fixed pricing and a written project schedule, we make your building project straightforward from initial consultation to final handover.
Why Homeowners and Businesses Choose Alpha London Builders?
Choosing the right building company can be challenging when you're concerned about unexpected costs, project delays and inconsistent workmanship. At Alpha London Builders, we make the process straightforward with dedicated project management, transparent pricing and a consistent team overseeing your project from the initial site visit to final handover.
Whether you're planning a loft conversion, house extension, new build or property refurbishment, our experienced builders in London provide detailed written quotes, follow an agreed schedule and keep you informed throughout the project.
We prioritise quality workmanship, tidy workspaces and clear communication to deliver reliable results built to last.
Planned around your property
We start with a survey of your property and how your household lives, then design the build around both.
A fixed price in writing
You get an itemised quote before any work begins. No hidden extras and no surprise invoices halfway through.
Signed off and guaranteed
Structural and electrical work is certified and inspected, and our workmanship comes with a written guarantee.
Builders in London who sweat the details
Hiring builders in London is a big decision, so we show you the work first. These photos come from our own sites, from the cladding and glazing outside to the tiling, kitchens and bathrooms inside.
Look closely at the straight tile lines, the neat joinery and the clean edges around the glass. That is the level of finish we aim for on every job, large or small.
- Structure, cladding and glazing
- Kitchens, bathrooms and tiling
- Flooring, joinery and final decoration
Our Building Services in London
At Alpha London Builders, we provide a complete range of building services in London, from loft conversions to full rewires, with our trusted in-house trades covering every stage of your project under one roof.
Loft Conversions
Transform your home with expert loft conversions in London by Alpha London Builders. From design and planning to construction, we deliver quality loft conversions tailored to your needs.
Learn more →House Extensions
Rear, side return, wraparound and double storey extensions designed and built to fit seamlessly with your London home.
Learn more →Basement Conversions
Cellar conversions, basement lowering and full new excavations, engineered and waterproofed to BS 8102 by our in-house team.
Learn more →Garage Conversions
Integral, attached and detached garage conversions into bedrooms, offices and annexes, most without planning permission.
Learn more →Property Refurbishment
Cosmetic updates through to full structural refurbishments, managed under one dedicated site manager from start to finish.
Learn more →General Building
Repointing, roof repairs, damp treatment, brickwork and small structural alterations, carried out by our own trades.
Learn more →
Our Proven 4-Step Building Process
Our London builders follow a structured, transparent approach that keeps every project on schedule, within budget, and aligned with your expectations.
Survey & Design
A free site visit to measure up, talk through your ideas and agree what is realistic.
Fixed-Price Quote
An itemised quote and a realistic timeline in writing, usually within 48 hours of the visit.
Build
Our own tradespeople build to the agreed programme, with regular updates from your site manager.
Handover & Guarantee
A full walkthrough, certificates for the regulated work and a written guarantee on the build.
What London homeowners say about working with us
"Our extension took exactly as long as they told us it would, which after two quotes from other builders felt like a small miracle. Would use them again without hesitation."
"We had our kitchen and bathroom done at the same time and expected chaos. Instead we got one site manager, one clear schedule, and a fixed price that didn't move once."
"Alpha converted our loft into two bedrooms and a bathroom without a single hiccup. They turned up when they said they would, kept the site tidy, and the finish is better than we hoped for."
Get a Free Site Survey & Quote for Your Project
At Alpha London Builders, we provide free site surveys and no-obligation building quotes for residential, commercial, and industrial properties across London. Whether you're planning a new building project, home extension, office refurbishment, commercial fit-out, loft conversion, or complete building renovation, our team will assess your requirements and provide a detailed quote with transparent pricing and a clear project timeline.
Book Your Free Survey
No sales pitch, just an honest look at your project.