146 New Cavendish Street — Synergy Build project

CASE STUDY | LONDON

Modernising a 1960s Building

146 New Cavendish Street · London

Area: 9,000 sq ft
Value: £2,300,000
Duration: 18 weeks
Scope: CAT A & CAT B Fit-out

The Brief

Our client acquired 146 New Cavendish Street to create a centralised headquarters while also delivering flexible commercial space to support future business expansion. The project encompassed a full strip-out, CAT A and CAT B fit-out of the existing 1960s building, modernising it to meet contemporary workplace and environmental standards.

The refurbishment focused on repositioning the asset as a high-quality multi-tenant commercial building with improved services, façade performance and adaptable floorplates.

Key objectives included replacing ageing infrastructure, upgrading building services, and enhancing the street-facing presence of the property. The client also required space planning that supported both immediate operational use and long-term leasing flexibility.

Delivered within a constrained urban site, the project demanded a Design & Build approach that balanced technical complexity, programme efficiency and evolving client requirements.

The Solution

We delivered the scheme as a full Design & Build refurbishment, leading both technical design coordination and construction delivery. Early strip-out works began while finishes were refined through weekly sample workshops, enabling programme momentum alongside design development.

The mechanical and electrical strategy focused on performance and sustainability to achieve the highest levels of efficiency and EPC compliance. A VRF system supported by rooftop plant and AHUs was introduced, with wall-mounted units discreetly integrated within bespoke joinery. Utilities were fully upgraded, requiring coordinated works across multiple street connections.

Extensive basement waterproofing works included substrate preparation, membrane installation and wall treatment systems to eliminate historic water ingress and create a commercially viable lower ground environment. Façade replacement, roof repairs, fire compartmentation upgrades and specialist confined-space works further enhanced building performance and compliance.

The Results