The Challenge:

Frelene (Grosvenor Street) Ltd have leased the building for several years and wanted to create a new commercial space in the heart of Mayfair. The old building was starting to show signs of aging and Westminster City Council granted permission to demolish the existing building whilst retaining a section of the existing façade. The remainder of the front elevation had to be constructed using traditional materials such as timber windows, lead and slate roofing, natural stone and reclaimed brickwork.

Located just off New Bond St, on a one-way street in the busy retail shopping and commercial area of London, this site has an extremely tight footprint with party walls on three sides which would lead to complex party wall negotiations and construction considerations.

The new building would be a five storey steel frame development to offer Cat-A office space, with all works taking place within the strict conservation area owned by Grosvenor Estates. There are also two live historical Thames Water sewers running underneath the site which would pose a challenge and would restrict the structural design.

The Solution:

Demolition of the existing building, except for a small section of the front façade, was undertaken directly by the client before Kier took possession of the site. The new section of front façade was constructed primarily from reclaimed Suffolk White bricks which were selected to match the original façade. Over 20,000 of these stunning bricks were sourced from an architectural salvage specialist based in Suffolk. The side and rear elevations are more contemporary with large storey height “punched” windows.

Since the project was fenced in on three sides complex coordination was required and Revid 3D and BIM modelling were used to aid discussions and planning sessions with the architect and design team. Our project team also had to obtain a build over agreement with Thames Water and had to develop their temporary works around the two live sewers to ensure that no movement occurred.

Ducting through a ‘sandwich slab’ in the core provides supply air to the office floors and extracts air from the ceilings. The ductwork was installed early on in the programme as the core was constructed.

The Impact:

The new building provides state of the art commercial space in the heart of Mayfair. It consists of a basement concrete box to the ground floor built off piled foundations, with a concrete lift and stair core to roof. The structure above ground consists of a steel frame with metal decking and concrete topping.

It is fitted out to a CAT A standard with exceptionally high-quality finishes to reception, toilet cores and stair areas. It has a boutique feel and incorporates polished plaster, hand selected Carrara marble finishes to the walls, floors and vanity units, walnut benches and lockers, and Bill Amberg leather lined walls in the lifts with bespoke stainless steel handrails and integrated mirrors. The lift from reception can be called without physically touching a button, ensuring visitors and users can access the floors with minimal touching of surfaces.

There are cyclist storage facilities, a cycle repair centre and dedicated changing room that has a spa like feel. Plant is primarily located on the roof behind a plant screen, with stand-by generator, a UKPN substation and water tanks located in the basement.

" Our vision was to create a beautiful commercial office space with a focus on bespoke, high quality finishes. We selected Kier to deliver this project due to their knowledge and experience, and watched as they were able to handle each challenge, with a positive, solutions focused, and collaborative approach. The completed building is beautiful and a real gem that stands out on Grosvenor Street. Our expectations for a quality product have been fully met and we are excited to see our building used over the coming months and years. "
Saul Sutton Director Frelene (Grosvenor Street) Ltd

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