Builders are facing a perfect storm of rising interest rates, more expensive construction materials, a dire shortage of skilled workers and slowing demand for new developments that has led to financing problems across the industry, The Financial Times reported.

“We are at the end of a 10-15 year property boom,” said Moritz Schularick, head of the Kiel Institute for the World Economy in Germany, adding, “The financial cycle is now such that every day another property developer is going bust . . . The old funding models are no longer sustainable.”

A number of developers have filed for insolvency in the past few weeks, among them three Düsseldorf-based firms Gerch, Centrum Group and Development Partner, as well as Euroboden of Munich and Project Immobilien Gruppe of Nuremberg.

Meanwhile, big landlords such as Vonovia and Aroundtown have announced big writedowns of their property portfolios.

“With interest rates rising so quickly, a lot of projects are just not profitable any more,” said Clemens Fuest, head of the Ifo institute in Munich, a think-tank, adding, “Demand in residential housing has just collapsed.”

Some experts think the situation could deteriorate.

“With developers that bet on rising prices I expect to see an increasing number of insolvencies in the market,” said Dirk Salewski, head of BFW, the German association of independent real estate and housing companies, adding, “The most highly-indebted are the most vulnerable.”

The crisis in the housing sector is a problem for Olaf Scholz, chancellor, who came to office vowing to build 400,000 flats a year. Just 295,300 dwellings were built last year and industry executives expect the numbers for this year and next to be even lower.

Ministers have adopted measures to help the sector. At its two-day retreat in Meseberg palace last week, Scholz’s cabinet passed a €7bln package of corporate tax relief that included new rules on the depreciation of investment costs for builders. Building inister Klara Geywitz said they should help “really rev up” housing construction in Germany.

But Salewski of BFW called the rule change a “drop in the ocean”.

“It doesn’t solve the main problem, which is a lack of liquidity,” said Tim-Oliver Müller, head of HDB, the central federation of the German construction industry.

Müller called for more low-interest loans for homebuyers, a relaxation of tough energy-efficiency standards in new buildings and investment allowances for publicly-owned housing associations to help them complete stalled construction projects. He said he hoped Scholz would adopt some of these suggestions at a planned construction summit in the chancellery later this month.

Construction, which accounts for 12 percent of Germany’s gross domestic product and employs nearly 1mln people, is seen as a key pillar of the German economy. But it is stuck in a deep recession.

Only 135,200 flats were permitted in the first six months of this year, 27 percent or 50,600 fewer than in the same period last year. According to Ifo, in July 40.3 percent of construction companies complained about a shortage of orders. Some 18.9 percent said projects had been cancelled and 10.5 percent said they had experienced financial difficulties.

Schularick called on the government to intervene in the sector, saying it should usher in a big housing construction program which would have the added advantage of stimulating Germany’s weak economy.

“Private developers are not going to be building any housing in the next couple of years, so the state, the municipalities, the public sector should be going in there and financing construction,” he said, adding that Germany’s many publicly-owned housing associations could be used to drive the program.

“We urgently need new flats, not just as a short-term fiscal stimulus but as a long-to-medium term growth program.”