Basement Construction Specialists in London

 

  • Custom Basement Solutions for Every Property

  • New Build Basements

  • Basements Under Existing Properties

  • Garden Basements & Extensions

  • Complete Waterproofing & Sump Pump Systems 

  • Underpinning, Foundations & Structural Works

 

 

Book a Free Basement Survey Today

Looking for expert basement construction, waterproofing, underpinning, or groundworks in London? Delta Force Basements deliver reliable, high-quality results to a waterproof shell – ready for fit-out.

Contact us now:
Delta Force Basements
Tel: 020 8092 0756
Mobile: 07405 046475
Email: groundworkcontractors@hotmail.com
Opening Hours: Mon–Fri 08:30–18:00, Sat–Sun 09:00–14:00

We provide free surveys across Greater London. Get in touch today and let’s start your project.

What We Do – Basement Construction Services in London

At Delta Force Group Ltd, we provide a complete range of basement construction services designed to give homeowners and developers strong, secure, and waterproof living spaces beneath their properties. Our work covers every stage of the process – from design and excavation to underpinning, waterproofing, and final structural works.

Our Basement Services Include:

  • New Build Basements – full basement construction for new developments, engineered to meet the highest safety and structural standards.

  • Basements Under Existing Properties – careful excavation and underpinning to add a new level of space beneath your home without altering the footprint.

  • Garden & Driveway Basements – under-garden basements and extensions that create extra living areas such as offices, gyms, or playrooms.

  • Complete Waterproofing Systems – cavity drain membranes, perimeter drainage channels, and sump pump installations to keep every basement dry and protected.

  • Underpinning & Foundation

  • Strengthening – ensuring your property remains structurally safe and stable throughout the basement build.

  • Structural Repairs & Groundworks – additional support and construction services to deliver basements built to last.

Every basement we build is delivered to a high-quality waterproof shell, ready for your chosen fit-out, whether that’s a home cinema, wine cellar, gym, or additional bedrooms.

With over 15 years of specialist experience, Delta Force Group Ltd are trusted basement builders in London, known for quality, reliability, and long-lasting results.

Basement Types We Build

  • ✅ Basements under existing houses

  • ✅ Garden basements

  • ✅ Side and rear basement extensions

  • ✅ New build basements

  • ✅ Full footprint basements

Under-Garden Basements

Transform the space beneath your garden into a functional living area with our under-garden basement construction services. We specialise in maximising space and natural light, creating a seamless extension of your home that blends beautifully with your outdoor surroundings.

Typical Timeline

  • Week 1–2: Setup, site prep, and initial dig

  • Weeks 3–6: Underpinning and deep excavation

  • Weeks 7–9: Concrete works and waterproofing

  • Week 10–12: Drainage, sump pumps, backfill, and shell handover

Timelines depend on project size and access conditions.

Underpinning Services

Our underpinning services are designed to strengthen and stabilise existing structures, including basement foundations. Whether you need to reinforce your basement walls or increase the depth of your basement, our team has the expertise to handle the job efficiently and effectively.

Why Choose Delta Force?

  • Over 15 years of basement construction experience

  • Fully insured and qualified groundworks specialists

  • Fixed-price contracts with staged payments

  • Health & Safety compliant with structural warranties

  • All work is over seen by structural engineers and waterproofing specialists

  • Trusted by homeowners, developers, and architects across London

Can you build a basement under an existing property?

Yes. We regularly construct basements beneath existing homes using underpinning and reinforced concrete works. All projects are engineered, staged, and completed safely to ensure the property above remains fully supported.

Do you build under-garden basements?

Yes. Under-garden basements are one of our specialities. They are an excellent way to create a new living space without disturbing the main house.

How long does a typical basement project take?

Most basements in London (around 60–80m²) take between 10–14 weeks to complete to the waterproof shell stage, depending on size, access, and engineering requirements.

 

What standards do you follow?

All our basement projects follow BS 8102:2022 waterproofing standards and are carried out to full structural engineer specifications.

Contact Us Today for Your Basement Construction Needs

Get in touch with Delta Force Basements for all your new build and under-garden basement construction requirements. Our experienced team is ready to assist you with your project.