1 Horse Guards Road, London SW1, is the only building on the HM Treasury estate over which the department has the necessary control of the structure and services to consider improving energy efficiency by the provision of further insulation. However, as the building is Grade 2* listed, options for doing this are very limited.
The building was totally refurbished in 2002 under a PFI agreement and insulation in the structure was incorporated to the standard required at the time. It has solid walls and a flat roof structure, so retro-fitting further insulation would be both very expensive and disruptive to the business of the five Government departments and 10 ministers that operate from the building.
The PFI partner and FM provider concentrate on ensuring insulation to services are well-maintained and renewed when necessary. For example, the hot and cold pipework on the roof area have recently been reinsulated.