Powers to turn empty houses back into homes are not being used enough because of the cost and risk faced by councils, a report has said.
Councils can take control of homes if they are left empty for two years and are in a bad condition.
An inquiry heard taking action could be a “massive risk” because the process is expensive and might not work.
The Welsh Government said it was on target to bring 5,000 empty homes back into use.
It will consider the report carefully and respond in due course, a spokesman said, adding the government was improving its Houses to Homes scheme to simplify the grants and loan process and set up a team to help councils tackle empty homes.
AMs want a national plan to deal with the almost 30,000 empty homes in Wales.
The assembly’s equalities committee launched an inquiry because of concern that empty homes are blighting neighbourhoods.
The report is about empty privately-owned homes – figures show there were 27,000 in April 2018 – but councils and social housing landlords also have 1,700 long-term empty properties.
There have been complaints about them attracting vandals and vermin and dragging down the price of nearby homes.
Some homes deteriorated because owners inherited them and could not afford to renovate them, the committee heard, while some councils encountered uncooperative owners or could not trace them.
Empty properties brought back into use – 2018/19
% by council of private houses empty for six months or more and brought back into use
Figures also show 4.6% of empty homes in the last year were brought back into use, although there was a variation between different councils, compared to 5.2% in 2017-18.
The committee said it was “particularly frustrating” homes were going to waste when there is a shortage of housing.
A dedicated empty homes officer “can make a significant difference”, the report said, but not all councils have them.
Councils have powers to bring homes back into use by applying for empty dwelling management orders, but only four councils said they used them and only three used compulsory purchase orders.
AMs were told there was a “significant financial risk to authorities where substantial work is required to an empty property with no guarantee of a positive outcome”.
Buildings scarcely visible
The Brynmefys estate, on the outskirts of Llanelli, is among the empty homes detailed in the report.
All but three of the 32 homes have fallen into disrepair and serve as a ghostly reminder of the estate’s heyday.
Windows are boarded up, there are gaping holes in roofs. Some buildings are so overgrown they are scarcely visible from the road.
The resident I spoke to, who did not want to be named, said there had been problems with fly-tipping and drugs in some of the empty houses.
“When we first came here it was full of people, full of children,” one of the remaining residents said.
“It was a community. But it gradually changed over the years.”
Three families still live on the estate – they’ve been there since the 1970s, but everyone else started moving out in the 1990s.
Carmarthenshire council said it was “actively seeking potential developers” for the site.
The report recommends looking at new powers to force owners to sell.
Committee chairman John Griffiths said: “Local authorities have powers to deal with empty properties, but taking enforcement action isn’t straightforward. It is time consuming and there is no certainty of it being successful.”