Hello, i purchaced a new 5 bed property last June, everything great, not a problem with the house(believe it or not) ,then came the winter, after spending nearly £1150 for two quarters in gas bills , i cannott get the house warm, ive contacted my house builder by means of a wriiten letter, i had a very quick reply and they sent out there own plumbers to check wether the correct spec of heating was put in, of course they said everything was ok, Im now thinking if the spec is ok, maybee ive got a problem with the insualtion? when i turn the heating off the temp drops immeadiatly,Is there a possibility that the cavity insulation could be missed out? ive got a section on the side of my house with 6 bricks that have been cut out and put back in, (the mortar isslightly a different colour and bricks not 100% aligned) im thinnking has someone came along to check?? what other reason is there to take bricks out the external wall?? or could it be poor upvc windows, i have no drafts any were else. the boiler just goes on and on and on, cant even reach 21 to shut off on the thermostat, im loosing heat somewhere, cant work it out, im not going through another winter again, im seriously thinking about renting a two bed flat for 5 months over the winter, but paying over £360k for a house why should i, many thanks in advance for your replies and thoughts