A controversial change to the B.C. Building Code has gone into effect, allowing the construction of wood-frame buildings up to six storeys in height.

The old limit was four storeys.

The B.C. government has cited numerous benefits for the change, which took effect April 6: lower cost and "green" construction, as well as a new market for B.C. wood products.

But others see problems.

John Grasty, president of the Consumer Advocacy and Support for Homeowners Society, says the government has developed fire and other safety regulations based on the experiences of other cities that permit taller wood structures. But those regulations haven't been tested in the province, Grasty said.

"We're jumping into something with no caution," Grasty said, adding that a similar process led to B.C.'s expensive and continuing problems with leaky condominiums.

The government has demonstrated its willingness to make amendments. Anticipating possible earthquakes, it added a new seismic safety provision three days before the change to the building code took effect.