Our extension was finished a year and a half ago just before Xmas. There were a couple of snags but we were happy to leave until after Xmas. They've never got done though. We've had a friendly relationship with him over the last 18 months as he did another extension on our road and we didn't really hassle him about it. Each time we saw him he promised he'd do it. I realised in May tho that we hadn't had the buildings completion cert from the council. I then got the inspector round myself who said was all okay but needed the gas and electricity certificates for the work done on those. I contacted the builder and he said would sort it over half term but didn't show up. I've contacted him again recently and he's now not replying. I have contact details for plumber but not electrician who were both subcontractors so have contacted plumber but also no reply. We withheld £1000 of the builders fee originally as the snags weren't done so would BU to say to builder I'm keeping that money to do snags and pay other contractors to certify the gas and electricity work?