top of page

Cat A Refurbishment

11 Strand is a commercial office building located in London, owned by Avery Real Estate. The building underwent a Category A (Cat A) refurbishment project, with Proton Built Environment as the consultant. The scope of work included mechanical and public health services design, as well as electrical services coordination, with a total value of £2.3 million. The duration of the project was 24 weeks.




The project presented several challenges, including the need to partially expose the services within the break-out areas and reception, as per the client's requirements. Additionally, the installation of on-floor mechanical ventilation heat recovery units (MVHR) was particularly challenging due to the restrictive on-floor plant rooms adjacent to the louvres.


The MEP (Mechanical, Electrical, and Plumbing) design for the project included the installation of LED lighting with efficient lighting controls, on-floor/demised MVHR units, and a VRV multi-split air conditioning system. The on-floor MVHR ventilation system was carefully installed within the limited space of the plant rooms adjacent to the louvres, overcoming the challenge of restricted access.

The existing MEP systems were completely replaced with new installations to meet the latest energy-efficient design requirements, as per the client's brief for self-contained/demised mechanical, electrical, and public health services to the floors. The design ensured that the desired environmental conditions were achieved, while adhering to energy efficiency standards.


The Cat A refurbishment of The Strand was successfully completed within the 24-week duration, meeting the client's requirements for partially exposed services in the break-out areas and reception. The new MEP installations, including LED lighting, MVHR units, and VRV air conditioning, provided improved environmental conditions and energy efficiency for the commercial office space.


The Cat A refurbishment of the 11 Strand in London, undertaken by Proton Built Environment, with mechanical and public health services design provided, resulted in a successful project delivery. The careful coordination and installation of MEP systems, including LED lighting, MVHR units, and VRV air conditioning, met the client's requirements and improved the environmental performance of the building.

bottom of page