Looking to purchase a resale property ( because of all the problems with off plan ) in the Murcia region 05/06 , and a collegue in the Costa Blanca gave me a breakdown of typical estate agents fees.
He has bought and sold two properties with a leading estate agent
( cuspide) and their fees were 15% to the seller + 7% to the buyer .On a typical €200,000 property the fees would be :-
Buyer receives €164,000
15% sale commission €24,600
7% buyer commission €11,480
Agents Total €36,000
You could actually set yourself up as an estate agent in Spain for about €5000, then arrange to collaborate with the selling agent with yourself as client and split the commission 50/50 with him.
Or just get your colleague in the Costa Blanca to do it. A plan so cunning, you could put a tail on it and call it a fox.
Alternatively, just ask the agent to put in writing the commission he will make before you hand over a cent. If it looks outrageous, either negotiate him down to a sensible level (certainly no more than 5%) or find another agent who wants to play.