Percy Street

This project was a commission to manufacture and design a roof structure for a building extension in London. 

The hexagonal roof structure was created from British grown oak glulam, supplied by UK Hardwoods, and was designed to both support a terrace above and create a feature of the glazed unit for the room below. 

The most challenging part of the design was the three-way moment node joints used to create the honeycomb effect. The joints had high forces and had to be carried through the existing building in pieces so the challenge was a design that would take the force, but was also practical and even possible to assemble in a tight space. 

Once the roof was in place, the client added their choice of fire finish to the glulam to ensure the finished product was suitable for commercial use. 


  • Project: Percy Street, London 

  • Commission: Hexagonal roof structure 

  • Architect: Spparc Studio 

  • Main Contractor: Stanway Interiors, G-Frame  

  • Engineer: Mason Navarro Pledge   

  • Timber: British grown oak glulam supplied by UK Hardwoods 

  • Fixings: concealed dowels and flitch plates 

  • Finish: fire varnish 

  • Cost (approx & 2022): £2,000 per square metre – design, manufacture and supply 

percy street oak glulam model view
percy street oak glulam model view 2