The Lark

Minimising embodied carbon in concrete-framed buildings

The Lark was built on the site of a former Royal Mail sorting office in Battersea. It posed several challenges typical of brownfield sites, with the most significant being the development’s location on top of a large Thames Water storm sewer.

Galliard Homes secured outline planning permission and commissioned Walsh in 2018 to facilitate design from detailed planning application through to delivery. The completion deadline was tight with projected completion in 2022.

To work with the proposed scheme, an efficient structural frame needed to be developed and early engagement with Thames Water regarding the sewer. The design had to fit with the architectural intent, keep the programme tight and, wherever possible, reduce cost.

By joining the project at an early stage, there was an opportunity to influence the design by optimising the grid and reducing the amount and type of concrete in the superstructure. To assess the embodied carbon and costs of different design options, various grids and slab thicknesses were compared, including post-tensioned concrete.

To mitigate the impact of the additional concrete in the sewer buildover and landscaped podium, a cement replacement was specified to minimise the carbon intensity. We had to work closely with the contractor to reassure them that using cement replacements would not have an impact upon their programme.

An embodied carbon calculation was conducted at both RIBA Stage 2 and Stage 5 of the project’s development. This revealed that we had reduced the estimated embodied carbon of the development by 30%. Of the total 30% reduction, 20% was due to less material, and 10% due to cement replacement.


Photography Credit: Peter Landers 

  • Galliard Homes Limited
  • fourfoursixsix
  • O’Halloran and O’Brien (OHOB)
Completion Date2021

Please click on images below to open a full-screen gallery.

Explore Related Projects

Student Accommodation

Chapter London Bridge

Innovating city student living through MMC [...]

Read more

Student Accommodation

Wembley Park Plot NE01

Using lean design to reduce embodied carbon on large PBSA scheme [...]

Read more


83 Barchester Street

Revitalising a site of industrial heritage for modern living and community-focused design [...]

Read more


Paddington Green Police Station

Wind-tunnel testing and temporary works design reduces high-rise concrete volumes & embodied carbon [...]

Read more


Quay House

Integrated engineering approach delivers elegant & sustainable hotel design [...]

Read more

Mixed Use

Harold Hill Family Welcome Centre

Structural scheme designed for future-proof adaptation [...]

Read more

Taking Sustainability Seriously

Sustainability is in our DNA and we have our own ambitious goals to achieve Net Zero as a business and with our designs. With innovative in-house monitoring tools, Walsh clients have seen on average reductions of 10-20% total embodied carbon, with some of our flagship work achieving 60-70% reductions compared with baseline figures.