If you want to build a swimming pool, however big or small, you will need to apply for planning permission from your town hall or local council in order to get a licence to build your pool. According to Spanish swimming pool company Proyectos Piscinas, which specialises in helping clients build pools, an architect's fee will cost between €450 and €1500. According to Rumafi Piscinas based in Catalonia, in 2026 a pool can range from €26,000 for a 6x3 metre pool to €32,000 for a 8x4 metre pool.