BREEAM Excellent for 50-52 Welbeck Street Development

Encon Associates were appointed BREEAM Assessors and BREEAM Accredited Professionals for Welbeck Street by the well-known Howard de Walden Estate, who manage and own a portfolio of properties in Marylebone, including some of London’s most prime shopping areas, as well as 750 homes and Harley Street.

Encon Associates supported a strong design team, including Virtus Contracts and JLL UK on this Howard de Walden Estate development on Welbeck Street from residential to luxury offices.

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Evolution of Traditional town houses into a Modern Office Space

Welbeck Street is a Victorian Building dating back to circa 1890’s, and the challenge was to convert 3 properties, 50,51 and 52, into a sustainable Grade A open plan office accommodation, over 17,500 sq feet across four floors. The party walls between the 3 buildings have been removed to creating a very grand feel.

A Challenging project

Virtus Contracts, a main contractor, considered this “one of the most technically challenging” projects of its kind. A huge task was the installation of a new Lift shaft and the construction and installation of a cantilevered staircase. As this was a listed building and 3 buildings coming into one, taking it back to its shell was an enormous feat, with 600 tonnes of demolition and strip waste being removed, and its busy location in central London didn’t help matters. 

welbeck st staircase

Key facts

Client: Howard de Walden Estate

Project Title: 50-52 Welbeck Street – Conversion to Offices

Size: 17,507 m sq

Location: London

Services Provided by Encon: BREEAM Offices Assessment and BREEAM Accredited Professional

Rating: Excellent

Score: 72.1%

Key features of Welbeck Street

  • New feature cantilevered staircase
  • BREEAM “Excellent” rating
  • EPC rating – B
  • LED lighting installed
  • Cat 6 voice/ data cabling and outlets provided
  • Underfloor trunking & raised floor
  • VRV Air conditioning
  • 4 x Unisex showers
  • 36 Secure lockers provided at lower ground.
  • 24 No. dedicated cycle spaces
  • Small power 25W/m2 and lighting load 10W/m2
  • Occupational density of 1 person per 10m2
  • New 8-person passenger lift

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