The European Union's executive has made its "Renovation Wave" strategy, which is due to be published on Wednesday, a priority in its plan to cut greenhouse gas emissions across the bloc to net zero by 2050.

The Commission does not comment on draft documents, which are subject to change before publication.

Energy-guzzling buildings, many of which are heated by fossil fuels, produce more than a third of EU carbon dioxide emissions and account for 40% of the bloc's energy consumption. Most of today's buildings will still be in use in 2050 - meaning could thwart the EU's green goals unless they are upgraded.

"The objective is to at least double the annual energy renovation rate of residential and non-residential buildings by 2030," the draft document said.

At the moment, about 11% of existing buildings in the EU are renovated each year. But most renovations do not address energy performance and the EU's energy renovation rate is stuck at 1%.

A key pillar of the new "Renovation Wave" strategy will be the introduction of mandatory minimum energy performance standards for existing European buildings.

The Commission will propose the standards next year, following an analysis to decide when they will be phased in and the specific level of energy savings each building must achieve. All building types would be covered, according to the draft.

"It's absolutely essential that we have more legally-binding regulatory measures," said Louise Sunderland, senior advisor at the non-profit Regulatory Assistance Project, pointing to energy performance standards in the Netherlands, which have boosted renovation rates for social housing.

The aim is to incentivise building owners to upgrade properties in time to meet the new standards, backed by financial support from sources including the EU's 750 billion euro ($885 billion) coronavirus economic recovery fund.

Brook Riley, head of EU affairs for insulation manufacturer Rockwool Group, said 2030 would be an ideal date to impose an EU standard, to give investors and building owners time to prepare.

The move could also boost employment after the pandemic, adding an extra 160,000 jobs in the EU construction sector by 2030, the draft said.

"It's a job-creating machine," Riley said.

(Reporting by Kate Abnett and Gabriela Baczynska; Editing by David Clarke)

By Kate Abnett and Gabriela Baczynska