The report, which completes a lengthy investigation into the fire risks of timber-framed housing, said there was a “crisis of confidence” in the construction method.
The committee behind the investigation has called on Government urgently to bring forward the planned 2012 review of fire regulations.
Blazes in Croydon and Peckham, in 2007 and 2009 respectively, caused severe damage after blazes swept through timber framed construction sites.
The assembly has warned there is now a “significant level” of concern within the industry because of several fires since then.
“This is an issue that cannot wait,” said Nicky Gavron, who chaired the committee which assessed the issue.
“There is a crisis of confidence about the safety of tall and timber-framed buildings, and the government and construction industry must act now to tighten regulations and reduce fire risk.
“As we construct at higher densities and with more environmentally-friendly materials, we will see more tall and timber-framed buildings.
“It is therefore vital to current and future residents that we get fire safety absolutely right.”
The Department for Communities and Local Government said it was yet to receive the report but would consider its findings when it arrived.
The committee is particularly concerned about half constructed buildings, which have proved extremely vulnerable to fire.
It is calling for a ban on occupation of any large scale site where elements are under construction.
Other recommendations include more frequent inspections of sites by building control inspectors to ensure sites are secure and fire stopping measures are being installed.
The assembly also wants to see full surveillance of sites outside working hours to prevent arson attacks and a duty on builders to notify the fire brigade when construction starts on a timber-framed building site.