The lecture focuses on ABACO’s experience in providing adjusting services for various different insurers in relation to over 2000 claims and losses dealt with under builder’s warranty policies over the last 15 years since the introduction of the Building Standards Law “Ley de Ordenación de la Edificación”. The most common types and causes of damage and problems adjusting the losses will be discussed, and a number of real cases, chosen for their elevated cost or technical complexity, will be analysed.