More than 175,000 households across London are to benefit from energy-saving measures, thanks to a £145 million fund.
Mayor Boris Johnson is inviting boroughs across the capital to bid for a share of the cash in an effort to bring homes back to good standards.
The energy efficiency installations such as boiler and heating upgrades and insulation are expected to help residents save up to £180 on energy bills every year.
The Mayor’s Office has so far contracted property and infrastructure firm Capita Symonds £3 million to provide support to ensure energy-saving improvements worth at least £50 million by 2017.
Mr Johnson said: “This vital Decent Homes investment will enable us to help boroughs transform some of the poorest quality council estates and social housing in need of urgent repair.
“Many families are also rightly concerned at the cost of their energy bills so I’m delighted to be able to put in place a programme of energy-saving measures for homes across the capital. This will result in renovations that lower energy bills for thousands of residents.”