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Thanks. So I have a final plan now.... Flooring: damp proof membrane (1000 gauge) covered by Kingspan styrozone H350R (30 mm) with wet underfloor heating in a Styrofoam panel 25 mm thick and porcelain tiles on top, total thickness about 65 mm. I chose the Kingspan because it has much higher...

Thanks Roboughton - because it is not a garage conversion (doors still remain) that makes it officially a "home improvement" project. Hence I am not expecting to need any inspections or certificates. Equally I am not building in new power or lighting circuits, just replacing the exisitng sockets...

Thanks again for all your tips and ideas. Some answers to the various points raised. Will I insulate the ceiling? Yes. There is already a ceiling there with storage space above (garage has a high pitched roof). The joists are 70-90 mm, so I'll fill them with celotox and then cover with...

Thanks to all so far. In summary I have two things to sort out; insulation and heating. Would welcome any experience on the original questions relating to the type of insulation, vapour barrier, breather membrane, air-gap, plasterboard with insulation vs separate etc. I have seen strong...

Yes, there are 2 up and over doors, which I will replace with insulated roller shutters and then have a push in 'slab' of 75mm celotex to seal them off (during the winter).

Thanks Big-all! I had initially wanted to extend the central heating system to add radiators or wet underfloor heating. As you say gas is a lot cheaper than electricity. However the local council informed me that this would turn my project into a garage conversion, requiring it to pass building...

I am planning to insulate an attached garage as a home improvement project (not as a garage conversion). 3 of the walls are external single layer brick. The other is internal breezeblock. I am trying to achieve the best U value I can without going crazy with the insulation (something around 0.7...