Energy Performance Certificates in Mayfair

Common property types

• Grosvenor Estate Georgian Townhouses: The principal streets of the Grosvenor Estate, including Mount Street, Hill Street and Charles Street, contain grade II and grade II* listed Georgian townhouses of four to six storeys. Solid brick walls of 9 to 14 inches, original timber sash windows and deep basement servant quarters are the norm. These properties typically rate D or E on their EPC, with limited scope for improvement measures under current planning rules.
• Mayfair Mews Houses: Mews properties off Park Street, Lees Place and Rex Place were originally coach houses and stables, converted to residential use throughout the 20th century. They tend to have lower floor-to-ceiling heights, solid brick or rendered block walls, and have often been significantly modernised. A well-renovated mews house can achieve a C rating, particularly where underfloor heating and double glazing have been fitted.
• Residential Flats above Commercial Premises: Along Davies Street, South Audley Street and parts of Bond Street, residential flats occupy upper floors of mixed-use buildings. These often have party walls to commercial premises below, requiring assessors to consider floor insulation differently from a standard residential block.
• Mansion Flats near Grosvenor Square: The mansion blocks flanking Grosvenor Square and along Upper Grosvenor Street date from the Edwardian and inter-war periods. Solid brick construction with communal corridors, these buildings typically achieve D ratings, though individual flats that have been refurbished with modern boilers and improved glazing may reach C.

Typical EPC issues we find in Mayfair

• Listed Building Restrictions on Improvement Measures: Most residential properties on the Grosvenor Estate are listed or sit within the Mayfair Conservation Area. This restricts the ability to install external wall insulation, replace sash windows with double glazing or fit visible solar panels, meaning the potential EPC rating is often only marginally better than the current one.
• Deep Basements and Below-Ground Rooms: Many Mayfair townhouses have habitable basement and sub-basement rooms. Ground floor heat loss calculations must account for these additional below-ground storeys, and assessors need to verify whether basement rooms are included in the registered property boundary.
• High-Value Fit-Outs and Non-Standard Heating: Luxury refurbishments in Mayfair frequently include underfloor heating, air-source heat pumps integrated with smart controls, and multi-zone heating systems. Correctly identifying and recording the primary and secondary heating types is essential for an accurate RDSAP assessment.
• Mixed Commercial and Residential Use: Properties along the commercial arteries of Mayfair often blend residential and office use across different floors. Ensuring the EPC covers only the residential element, and correctly identifying party wall construction between uses, requires attention to floor plans and lease arrangements.