Assured Foundations


We have more than 35 years of experience in such projects and are proud to say we have some of the most technically advanced tradesmen in the market, that paired with our dedication to customer service provides the best customer experience all round.

Some of our most common insurance repair services:

  • Traditional / mass concrete
  • Pad and beam
  • Piled Foundations
  • Ground stabilisation / improvement
  • Void filling
  • Raft slabs for lifting and moving buildings
  • Re-levelling

We can offer specialist services around the UK with immediate response available in Essex (Chelmsford, Colchester, Basildon, Southend, Brentwood, Braintree, Harlow, Epping), Kent, Suffolk, Hertfordshire, Norfolk, London and Cambridgeshire.

If you have a project in mind please do contact us as we would love to be able help.

We are proud experts in:

Site investigation

Engineered design

Traditional Foundations

Traditional and specialist underpinning


Reinforced concrete rafts / beams

Pressure relief

Jacking and structural lifting

Grout injection

12 year insurance back guarantee on foundations at no extra cost

Call NOW: 01245 496 633Contact Us

Traditional Foundations

Traditional foundations are an economical and cost effective solution to lay for your build, colwin can design and construct your foundations from traditional strip to deep fill trench, ground conditions and localised vegetation will affect the design of your foundations we offer comprehensive site investigation services. All our foundations are covered by insurance backed guarantee for 12 years.

Piled Foundations

Where Traditional foundations are not appropriate we can design and install piled foundations to suit your needs, colwins can offer auger , steel cased driven and contiguous piling, throughout london and the south east, following installation of piles we can complete foundations from ring beam to reinforced concrete raft, all of our piled foundations are covered by insurance backed guarantee for 12 years.

Tradition / Mass Concrete / Underpinning

If your property has suffered from structural movement or you are looking to extend and increase the load bearing on your existing foundations it may be necessary to underpin. Traditional underpinning requires the excavation of material below the existing foundations down to good ground and filling with concrete. This operation can be carried out internally or externally, colwins can design and install your mass concrete underpinning and is covered by our insurance backed guarantee for 12 years.

Pressure Relief

If your property has been affected by heave (upwards movement) it may be necessary to excavate the ground below your property to release the pressure on your foundations, this is achieved by tunneling below the property to create voids which allows the ground below to expand and contract without affecting the structure, colwins can design and deliver a pressure relief scheme covered by our insurance backed 12 year guarantee.

Retaining Walls

A retaining wall is used to hold back land and stabilize uneven landmass If you need a retaining wall built or replaced in london or southeast, colwin group offer a design and build service.

Our Accreditations