London boroughs’ EPC rankings revealed

The best and worst London boroughs for energy performance certificate (EPC) C ratings have been revealed.

The data shows that Havering has the lowest share of energy efficient homes in London, with 43.15% of properties rated EPC C or above.

London’s average for an EPC C rating is 56%, the research from Cut Plastic Sheeting found.

Tower Hamlets records 79.75% of homes meeting that benchmark, the highest figure across the capital and approaching eight in 10 homes.

London’s EPC challenge

The firm’s managing director, Daniel Southern, said: “The scale of London’s energy efficiency challenge is clear, and with landlords now required to bring properties up to a C rating by October 2030, there is still a significant amount of work to do across the capital.

“There are a range of improvements homeowners and landlords can make to improve a property’s energy performance, from low-cost measures like draught proofing, low energy lighting and hot water cylinder insulation, as well as larger investments such as loft insulation, upgraded heating controls and solar panels.”

He added: “Windows are one of the biggest sources of heat loss in older properties, and for many homeowners and landlords, full window replacement is not always practical or affordable.”

EPC data

The firm’s data draws on nearly 2.5 million domestic EPCs lodged between January 2016 and December 2025, using records from the Energy Performance of Buildings Register.

For landlords, rented homes will need to reach EPC C by October 2030 under the Minimum Energy Efficiency Standards, placing a legal requirement on upgrades.

Tower Hamlets leads with 84,365 of 105,792 homes assessed at C or above.

The City of London follows at 67.95%, while Southwark records 66.83%, based on 54,675 compliant properties from 81,807 certificates.

EPC ratings for boroughs

Elsewhere, Hackney posts 66.78% and Greenwich 63.06%, while Newham (62.87%), Islington (62.11%) and Westminster (61.79%) all sit above the London average.

Wandsworth (61.07%) and Hammersmith and Fulham (59.16%) are close behind.

Lower down the table, Havering remains at 43.15%, Enfield follows at 43.69%, then Richmond upon Thames at 44.39%, Bromley at 44.46% and Redbridge at 44.77%.

Across the capital, 1,065,020 homes fall below EPC C, representing close to half of all properties assessed.