Built in 1999, Killeaton House consists of 23,500 sq. ft. of office space and parking across two storeys, originally designed with an open-air central courtyard. When Danske Bank, the building’s occupier, sought to upgrade and expand its workspace and amenities, Design ID was brought in to provide structural engineering solutions that would unlock additional floor area cost-effectively.
The obvious solution was to expand into the existing courtyard. Working with Todd Architects, Design ID developed a lightweight roof structure to enclose the courtyard and create a large, open internal space. This roof was supported by long-span steel beams and a rooflight structure, all placed on minimal internal columns near the façade to reduce the load on the existing masonry and maximize the flexibility of the internal space.
Due to potential below-ground obstructions, we proposed a thin piled raft foundation, which minimized excavation and material removal, while allowing the new floor slab to navigate over existing underground services.
The result is a high-quality, open, and light internal space. This solution was achieved at a reduced cost, with minimal disruption to the adjacent occupied offices, and successfully repurposed an underused area in a sustainable way—without resorting to a carbon-intensive new-build development.
We designed a lightweight roof to enclose the courtyard, with minimal new structure or disruption to the existing space.
Client: Danske Bank
Architect: Todd Architects
Value: £1.6m
