At Keller, we can offer a number of lower carbon products to help clients reduce the carbon footprint of their projects. We also offer measurement and offsetting.

Challenges we can help solve

  • A need to reduce the carbon footprint of a project
  • Provision of information to understand the true, whole life cycle carbon differences between solutions and inform a final choice
  • A need to offset carbon emissions to balance the carbon footprint of a project

Approaches to reducing carbon

Use less carbon-intensive solutions

Alternative ground improvement methods, such as vibro stone columns in place of traditional piling, can save 30% - 60% of the cost and up to 95% of the embodied carbon of deep foundations. This is due to the use of stone aggregate in place of concrete and steel, and typically more efficient installation.

Use of recycled materials

We can use recycled materials in our solutions, including glass sand in place of gravel, and GGBS (Ground Granular Blast Furnace Slag) and PFA (Pulverised Fly Ash) in place of cement. These are waste products of the steel and coal industries respectively which, as well as saving carbon, reduce waste and contribute towards the circular economy. We can also use recycled concrete.

Carbon measurement

We measure the embodied carbon in our products through our carbon calculator, enabling customers to make informed decisions in their choice of product. We use the EFFC-DFI carbon calculator that is standardised with geotechnical contractors across Europe.

Carbon offsetting

Using a standardised European carbon calculator, we can calculate full scope 1, 2 and 3 emissions for a specific project. We then offer to purchase certified carbon offsets through Climate Care to make the project net zero carbon.


  • An improved carbon footprint
  • In some cases lower costs, for example where replacement materials are cheaper
  • A contribution towards BREEAM and LEED scores on material use