RR de Acuña & Asociados expects home prices in Madrid, Barcelona and other major cities to fall a further 30pc in a relentless slide until 2018, but it may be even worse in sunbelt regions where 400,000 Britons either live or own homes.

Fresh losses could reach 50pc and drag on for 10 to 15 years in those places where construction ran wild during the bubble, bringing the total decline from peak to trough towards 75pc.

"The market is broken," said Fernando Rodríguez de Acuña, the group's vice-president. "We calculate that there are almost 2m properties waiting to be sold. We have made no progress at all over the past five years in clearing the stock," he said.

"There are 800,000 used homes on the market. Developers are sitting on a further 700,00 completed units. Another 300,000 have been foreclosed and 150,000 are in foreclosure proceedings, and there are another 250,000 still under construction. It's crazy."

The overhang is vast for a country with 48m inhabitants and annual demand near 200,000. It is coupled with an outflow of workers and the start of an aging population crisis.

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