On Spanish speculative building projects on the Costas, units are generally built to very poor standards and are hopeless in terms of preventing water penetration into structures during tropical style torrential downpours. A friend of mine owned a villa up near Denia years ago sited on a hillside, water cascading down the hill would flow under the doors and damp patches would appear round window frames. As it was a holiday home, he would often have to pay for removal of the black mould deposits on the internal walls and ceilings every year, before he or those renting the property could live in it. He was constantly having to renew sections of the exterior rendering on the walls.
The roof required constant maintenance, there was no inground soakaway for surface water drainage from the house, so that was all discharged onto the ground, as a result he had his garden flower beds completely washed away on several occasions.
The waterproof in ground bitumen tanking, supposedly protecting the lower floor rear wall which was partially built into the hillside, had to be renewed after just ten years. A large bulldozer had to be deployed to dig the spoil well back from the rear wall to enable the work to be done at some cost. The original in ground water proof tanking work was just a complete cowboy builder disaster.
If Murcia's climate ceases to be arid and becomes an area with a higher and heavier rainfall pattern, building specifications will have to be raised.