10 Spring Gardens

Key Design Ambitions

  • An enhanced reception / building entrance.
  • CAT A refurbishment to upper office floors.
  • CAT B show-floor on the 1st floor.
  • Flexible meeting rooms and workplace on the ground and basement floor.
  • Café in basement and ground floor with outdoor seating in the Piazza.
  • Office amenity space (including showers, lockers,and bicycle storage).
  • General refurbishment to the common areas and toilet facilities (including increased provision).
  • The installation of all new M&E services and IT/AV systems.
  • Refurbishment of 2 existing lifts in main core and installation of a 3rd passenger lift to main core.
  • Refurbishment of the existing fireman lifts in core 1 and core 3.
  • Improvements to the Public Realm and the Piazza.
  • Comply with The Crown Estate Development Sustainability Principles.
  • Design to be subject to the Better Buildings Partnership – Design for Performance (DfP).
  • BREEAM Excellent to be targeted.
  • Whole Life Carbon Assessment to be utilised for decision making.
  • Design Development will be undertaken within a BIM modelling environment.
  • Replacement of external windows and doors.
  • External Portland stone elevations repaired, repointed and cleaned.
  • Existing roof finishes replaced, incorporating new thermal insulation and Photovoltaic Panels.
  • Design to include future implementation of smart buildings technologies and software of the front of house area, café and atrium including full strip out and upgrade of all finishes and services.
  • Construction of a new standalone metal box structure within the refurbished atrium.
  • New flooring, new lighting, new staircase, new services, new meetings rooms and upgraded audio visual infrastructure to be installed as part of the refurbishment.


  • Cockspur Court (not a public highway);
  • Carlton House Terrace Portico (Portico cannot be altered without consent from WCC);
  • Entrance to pedestrian passage from to Carlton House (obligated to maintain public access at all times);
  • Piazza looking towards Trafalgar Square (Area at risk of registration as Town or Village Green.
  • Area subject of a licence permitting the Secretary of State for the Environment to access and regulate the same as if it were part of St. James’s Park. Part of the property at the lower end of the Piazza may form part of St. James’s Park);
  • Rights to oversail (No rights apart from a small area.
  • Additionally, no rights exist which permit scaffolding against 18 Carlton Terrace. Any right to be negotiated);
  • UKPN vent and access hatches (Sub Station is leased until 2073 and there are no provision for relocation or termination).
The Crown Estate
2020 - 2023

Project Team

Property Fund
Principal Designer
Stonewells via TFT
Mechanical Engineer
Watkins Payne Partnership
Electrical Engineer
Watkins Payne Partnership
Civil Engineer
Structural Engineer
Price & Myers
Fire Engineer
Jeremy Gardner Associates
Sustainability Consultant
Tuffin Ferraby Taylor
Planning Consultant
Gerald Eve
Ecology Consultant
Heritage Consultant
Project Manager
Tuffin Ferraby Taylor
Cost Consultant
Burnley Wilson Fish
Approved Inspector
Butler & Young
Principal Contractor

“Stonewells were engaged via TFT to deliver the Principal Designer role on behalf of The Crown Estate. I was impressed with how Mark integrated himself into the existing team on what is a challenging project from a design and logistics perspective given its sensitive location just off Trafalgar Square and Pall Mall.

Mark led the ongoing process to manage design phase health and safety hazards and risks diligently and has been in regular communication and liaison with all members of the project management and design team in doing so. Significant hazards and risks present on this site include asbestos, public interface management, temporary works, waste management and the design of the proposed new structure itself and Mark has been visible to all since his appointment and I recognise the value this yields.”