Just a fleeting idea...anyone got any sort of guesstimate /idea how much an indoor pool would cost... I'm thinking It would be c3.5m wide with 1m walkway round it - not sure of length maybe 7.5m in length - if we built it in a similar extension on the garage (which is brick plinth with rough sawn timber cladding). As I say it may be be no more than a pipe dream but I'm curious....