Robhan

Thanks. What's it like in winter? Assume blockwork would stay coolest then in summer?

Thanks. Why don't you like SIPs or PIR?

Hi I've just had permission to build a large garden room 12m x 5m which will form a gym and entertainment room. It needs to be built to building regs due to size. It'll have a small kitchen/bathroom. I've spoken to numerous builders (some I know and some getting quotes) and each seems to suggest the best way to build is either SIPs, Blockwork or a timber frame. I'm not a builder so don't know which to choose. Can anyone advise on the benefits/negatives of each and which might be most cost-effective option please? Other questions: Would you go for an insulated concrete base? and with insulation under the concrete or over it? How do I make sure the floor is strong enough? If it was timber frame or blockwork what insulation would you use - PIR or other? Would you go for a warm roof or cold? Any other major considerations to think of? Thanks Rob