The work we present is the comprehensive reform, for a humble family with two girls, of a small detached house in the town of Santa Cristina de Aro, located in the Baix Empordà region (Girona), about 5 km from the coast. The house that belonged to a relative, is located in the town center and is part of a promotion of the seventies of equal middle class houses. The main construction and biohabitability deficiencies were insulation, moisture from condensation and capillarity, causing fungi and an excessively humid environment, aggravated by the telluric flow of water on the north side and obsolete facilities, without grounding, which they generated electromagnetic alterations. Nor did it meet the needs of the functional program of the new inhabitants.