The Canberra Liberals say they will ditch the ACT Government's solar access laws if they win next year's election.

ACT Labor introduced the laws in 2013 to make sure that new houses can maximise the benefits of natural sunlight and reduce heating costs.

They force houses to be angled in a particular way to boost access to sunlight, and prevent any development or extension from casting too much shade on a neighbouring home.

The Liberals fought against the changes to planning regulations when they were first raised, but they passed with support from the Greens.

Opposition spokesman Alistair Coe says they will cut the solar access laws if elected.

He believes the legislation means many new houses are facing the wrong direction.

“The ACT Government has actually created worse solar access when it comes to block design,” he said.

“These blocks are now inefficient and we want to reverse this to once again get back to good design principles.”

Mr Coe says the legislation goes against the wishes of the Housing Industry Association and the Property Council.

“The design rules which the Government has put in place have resulted in some houses costing $10,000 to $50,000 more than they should,” he said.

“People are excavating houses and poorly designing them in order to comply with these rules.

“These rules will have intergenerational effects, because these houses will be standing for 50, or perhaps even 100 years.

“It's very important that we overturn these rules as soon as possible.”