Densely treed and sparsely populated townships in the Yarra Valley received the highest danger rating (BAL-FZ) from independent bushfire assessors.

Currently those rebuilding, or planning to do so, in these zones cannot get certificates of occupancy unless their home meets the new Australian standard.

Following months of testing, the Building Commission has endorsed a combined window and screen system for use in bushfire-prone flame zones.

Dixons Creek resident Drew Adamson, who is rebuilding after losing his house in the fires, welcomed the Australian standard for windows and frames, despite the hefty price tag of about $50,000 to fit his home with approved screens.

"It's a relief to have the technology available but, like many, we'll be hoping more companies get on board to help drop the price."

Mr Adamson said the shutters would be vital in protecting houses from flying sticks and embers in a fire.

"The cost of all these things to make a flame zone safe is incredibly difficult, especially for those under-insured or not insured at all."

Wildfire Protection Services, a company based in the south-eastern suburbs, was a leader in the research and development of BAL-FZ-approved window screen systems.

Director Paul Roadknight said he was proud to be at the forefront of the technology, and it was expected to be rolled out within weeks. "We're at a stage we can show people something that is tested and can do the job.

"It will be about six weeks before we have something available for installation."

The screen system, which will be placed on top of standard double-glazed windows, will cost about $2500 for a two-metre by two-metre window.

The screens have been tested to ensure they can protect windows from shattering under direct flame at 950 degrees for 30minutes. They must also be radiant heat and ember-proof.

"We're now fine-tuning the product, how it inter-relates to a new home construction or one that's partially built," Mr Roadknight said.

"The new challenge is to make it more affordable."

Building Commissioner Tony Arnel said the window and screen system was based on research design criteria published by the Building Commission.

He said the commission expected several manufacturers would meet the design criteria for the building regulations.