Step inside this stunning fit out

When leading insurer, Aon, relocated to prime office space in the iconic Leadenhall Building in London, we were asked to handle the highly complex Cat A and Cat B fit outs.

Leadenhall Building, London

194,000 sq ft

43 weeks


With offices arranged over 10 floors, Aon is the largest occupier in this multi-tenanted building. The project consisted of delivering both the Cat A and Cat B fit out covering 194,000 sq ft from levels four to 13.

The fit out occupies 30% of the overall net lettable space in the Leadenhall Building and was undertaken while other contractors were working elsewhere in the building. To avoid affecting neighbouring businesses — and to ensure the project ran smoothly — it was vital to communicate effectively with the other contractors, building managers and tenants.

Aon London cat b fit out of staff cafe

The project included creating a dedicated Aon reception, featuring a large-screen media wall installation. We also created a staff restaurant, client spaces, extensive meeting room suite, executive area, open-plan office space, and flexible, configurable ‘hub’ meeting zones.

And the centrepiece of the new space is a striking LED illuminated staircase, linking the front-of-house spaces on levels 4 and 5. Sustainability was also a key consideration — 94% of the waste created during the project was reused, recycled or recovered, diverting 787.9 tonnes of waste from landfill.

Aon Cat A and Cat B fit out
Aon meeting pods fit out

The high ceilings in this fit out required two intermediate landings to break up the considerable ascent of the impressive staircase connecting the office's first two floors. To keep the staircase inviting (despite the steep climb), the open stairs were illuminated with Aon’s brand red.

By using an open stair design, natural light is allowed to flow through, which is then maximised by the mirrored wall panels that reflect the light, all while creating an eye-catching feature staircase.

Aon LED lit staircase in cat A fit out
Aon office interior by Overbury
Aon London cat b fit out of staff cafe
Aon open plan office interiors

Explore another project