New properties have a 10-year building guarantee very similar to the NHBC guarantee in the UK. Although this type of guarantee has been compulsory in many Northern European countries for many years, it only became compulsory in Spain in the last 2 years.  The rental potential  is higher  as everything is in top condition which makes it easier  to let. For off-plans , by the time you move in,  the value can have increased by up to 25%.