When was theirs done?
My brother-in-law’s loft room was specified at 50mm (useless!) Celotex/Kingspan c.2000, then I think mine was 140mm (which is comfortable) in 2009 but I think it’s been increased to around 170mm now.
Presumably your sash windows are made to todays thermal standards so you should be fine.
That skylight/chimney thing sounds interesting.
Last year. In think regs are 120mm on a flat roof now (warm deck construction).
Aha!
For a pitched roof I have a feeling it’s much heftier, at around 170mm. So if a roof only has 150mm rafters, and allowing for a 50mm ventilation gap, there would need to be 130mm hard slab insulation between the timbers plus maybe a 48mm thermaline plasterboard.
(I will confer with Jordan of JA Lofts when I see him in my local bakery at 6:30am tomorrow).
Not all insulation is made equal and the recommended x mm of it is meaningless unless you know what it is. You can have 100mm of cheap stuff that provides the same insulation as 50mm of expensive stuff if that makes sense. (That’s probably an exaggeration but you get what I mean).
Which is why I mentioned the brands Celotex and Kingspan
It’s all in the U values.
Absolutely!
And to acheive the requisite U values Kingspan and Celotex will have their own table showing what thickness of a particular insulation board does the trick
Ahh, yes, sorry!
Hello, don’t think I can PM either. I would also like to PM like to ask if I could have the quote comparison and also like to PM Emily about Builders to avoid. Moving back to FH and will need to do a loft extension soonish. Many thanks!
I’ve enabled PMing for you, Linda
Thank you so much
Hi, Dan sorry for the slow reply. Really appreciate the advice and for you taking the time to provide plenty of detail. We’ve signed up with a building company now and just going through planning. All being well our case should be decided next week and we can get on with the build. Seems that staying very close to the builders throughout is key. We did challenge certain aspects of the plan where a number of seemingly unnecessary voids were included, i.e behind the toilet and in the eaves seemed excessive. Thanks again!
Hi there,
I’m a little late to the party on this thread but would love to know what you uncovered… I’m about to do a loft conversion myself and would be great to know who to avoid or anyone you highly recommend.
Also… I can’t seem to PM either (Chris?)
Hi James, did you find a good builder for you loft conversion I’m the end? Would love any tips!
Me too - please let me know what you find out! I’m particularly interested in the companies to avoid…
James, I’ve PM’d you.
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My loft build starts next month and im going with taylored lofts after a good amount of research and meeting 4 companys. I didnt speak to Classic as ive heard alot of bad things about them.
Thanks Simon, this helps a lot! Do you have a website or contact info for them? Want to make sure I reach out to the right people 
Just finishing up our loft build with Taylored - couple of weeks to go. Happy to answer any questions on how we’ve found them etc. over DM (although I might need that function enabled on my account).