Gov. David Ige has updated the state’s building codes and standards, requiring new construction to be more energy-efficient.

Ige signed on March 20 the new building code, which includes rules mandating hotels to have controls that turn off lights when occupants leave a room, and turn off cooling systems when doors are opened. Other rules include a requirement that new single-family homes have solar water-heating systems and ceiling fans in every bedroom.

The new rules, which were announced Thursday by clean-energy nonprofit Blue Planet Foundation, are set to go into effect for state buildings 10 days after being filed with the Office of Lieutenant Governor. The counties are required to put in place a version of the rules signed by Ige no later than two years after they were updated.

The State Building Code Council, which includes members of Hawaii’s development and construction industries, proposed to update the minimum requirements for building construction and design to the 2015 International Energy Conservation Code. The state currently abides by the International Energy Conservation Code of 2006.

Supporters of the change say that over the next 20 years it is estimated to save over $14 billion in energy costs once adopted by the counties.

“The bridge to 100 percent renewable energy starts with smart, energy-efficient buildings,” Jeff Mikulina, executive director of Blue Planet Foundation, said in a statement. “We applaud the governor, State Building Code Council, and the State Energy Office for advancing energy-efficiency codes that will save residents and business billions of dollars while preventing tens of millions of tons of global warming pollution.”

In the first year, the new code is expected to cut energy use by 12,000 megawatt-hours, the equal to the total energy used at 1,900 Hawaii homes in a year, said Brian Kealoha, executive director of Hawaii Energy, the state’s ratepayer-funded energy efficiency program.

Some of the new rules include requiring hotel rooms, guest suites and timeshare condominiums to have controls that disable mechanical cooling within five minutes of doors opening to the outdoors. The new buildings are also required to have a master control device that automatically switches off lights within 20 minutes of occupants leaving the room.

Gladys Quinto Marrone, CEO of the Building Industry Association of Hawaii, said the new code, “while well-intended, will place the burden onto the homeowner in the higher cost of homes.”