One Group
Complete Control
From foundations to aluminium facades
London's fully integrated construction group.
- Est. 2007|
- 100+ Projects Delivered|
- Official Cortizo Fabricator|
- RECC Accredited|
- London & South East
Why Cobalt
What Sets Us Apart
In-House Manufacturing
Own aluminium factory in Croydon. No middlemen, shorter lead times, full quality control.
Developer Mindset
We think like investors because we are investors. Your budget and timeline are our priority.
End-to-End Delivery
Architecture, construction and glazing under one roof. One point of contact, zero gaps.
Net Zero Ready
RECC accredited for Solar PV and Battery Storage. Designed into the building from day one, not bolted on afterwards.
Our Reach
Projects Across London
Maida Vale, Ealing, Croydon and beyond — Every pin marks a real, completed project.
Services
What We Build
Design & Build
Full project delivery from planning to handover. Architects, engineers and contractors under one roof.
Learn More →New Builds & Developments
Residential and multi-unit developments across London and the South East. From planning to completion.
Learn More →Extensions & Refurbishments
Premium extensions and full refurbishments. Specialists in London's period properties and heritage architecture.
Learn More →Accreditations & Partners
Complete Control Starts With One Conversation.
Architecture, construction and aluminium glazing under one roof.
One team, accountable from the first sketch to final handover.