Problems with extension/conservatory

[Tricia Duff]

I want to extend a small sitting room by building an extension with a glazed front and glazed roof.  Because I want to create one large room, I've been told that I have to provide heat loss calculations etc.  All seems very confusing, the easy option seems to fit internal doors, (making it a conservatory rather then an extension) but they would have to fill a 9ft gap.  Any suggestions?

[sddsddean]

What you have to do is design it as a conservatory with internal doors (this gets round the Building Regs) and then accidently on purpose, forget to put them in. This is what my next door neighbour did and he has never been pulled up on it. BTW, I haven't told you to do this, its just  a suggestion!!

[mr_vernon]

I have converted an already existing extension into a conservatory with 2 solid walls, one glass and a glass roof. I don't have any doors into my kitchen as I proved by doing the heat loss calculations that the pilkington K glass had a lower emissivity than what was already there. I looked up how to do the calculations on the web. My application was approved by Building Regulations and I have the relevant paperwork (helpful for when you want to sell). You have to drag your mind back to GCSE Maths however...