Hi everyone, not so long ago we bought a new build. We’ve lived in it for a full summer and a full winter now and I was wondering if I can get a bit of help regarding few little “issues”. Our ground floor is quite warm unlike the first floor and the bedrooms just won’t retain heat for long. Master bedroom is a south facing and very warm when sunny, but the spare bedroom is a north facing and is absolutely freezing during the winter. Main problem though is once we put the heating on both rooms get warm but about 2hrs later the spare bedroom goes to about 17-18C from probs around 22-23C (it could drop to 16C sometimes if too cold). This will be a nursery from next month and I’m trying to get it sorted before the winter. I’m thinking there is either no insulation or not across the whole wall, just doesn’t make sense to be so cold otherwise. It is a semi detached house and this is the outside wall, it’s meant to be full fill insulation, but not sure what this means exactly. We have draught excluders on every door and I’m putting insulating film on the windows next week to trial (of course a bit late but there could be some cold nights still) and see if this will improve heat retention. The builder at the moment is not much help and I can’t be bothered waiting for them. I’m trying to find out at what stage of the build the insulation goes into the cavity as the estate is still developing and there are a fair amount of houses I can see the ground floor is nearly done, however no insulation in the cavity yet and wondering of they put it in at all, so if someone knows when the insulation is supposed to go it will be helpful. Also any idea why it could be cold, what we need to look for or to check and/or some suggestions how to make the rooms warmer or retain the heat for longer. Thanks.