That is up from a figure of 29% recorded in 2005.
That is up from a figure of 29% recorded in 2005.
Meanwhile, among European cities, Kraków saw the largest rise.
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Marek Szymaniak
Once thriving centres of local industry, they became overlooked victims of the rapid changes since 1989.
The new rules increase the distance between blocks on neighbouring plots and set requirements for playgrounds and green spaces.
Over eight million Poles live in buildings constructed from prefabricated concrete slabs, a system widely used from the 1960s to the early 1990s.
The changes are part of efforts to help young people buy their first home as Poland grapples with a housing shortage.
Białystok, Kielce and the capital Warsaw were the worst, according to Business Insider Polska.
The value of loans applied for by Poles also increased by more than 270% to a record level of over 8 billion zloty.
Nearly half of young Poles still living with their parents have a full-time job, which is the second highest proportion in the EU.
The Left wants to build 300,000 social housing units over the next four-year parliamentary term.
Wojciech Kość
The prices of buying and renting have soared.
The idea has been criticised by, among others, The Left, which points out that it does not fix the problem of a housing shortage.
Officials say that the apartments were built as hotel rooms but are being sold on the open market.
Many new developments contain small apartments crammed closely together, often with little natural light, privacy and green space.