When I turn the taps off how can I stop the pipes banging loudly under the house?
The first idea would be to try a FIX-A-TAP Anti Hammer Tap Valve. These valves contain springs to prevent the water pressure changing so quickly that it causes a banging sound. Our FIX-A-TAP Hammer Relief Valve works along the same lines (by preventing the water pressure changing so quickly) but it is much stronger and is specifically designed for washing machines and dishwasher taps . If both of these fail to fix the problem we recommend that you use our PlumbConnect Plumbers Registry to locate a licensed plumber.