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The cost of the materials has not generally gone up much from a year ago. The cost of labour I'm not so sure about. I know you can still get a basic d ormer for 40k. My polish builder is quoting 55k for the extension I had done for 45k a year ago.
Unless both extensions are enormous and very high spec 110k should be a reasonable budget. But all depends on the spec really and how much the builder is marking up the materials.
princeperch-
Worth noting you do use very cost effective builders, I wouldn't consider your costs average but on the cheaper end of the scale.
AGL Lofts are a great example. 40k is very optimistic price wise, and you'll be making massive fittings, finish and service sacrifices to achieve that price. Using a proper company run by adults ours came in at a shade under 70K I think with nothing special fitting or finish wise (hell, I'm having to paint it all).
Friends just had a small extension and loft done and it only just came in at 150K and tbh they used pretty cheap people (and the finish in most places is suitably bad).
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Materials have actually fallen slightly recently, labour is definitely the issue. The cost of living is obviously the main driver but there are still people taking the piss. The architects we're using find contractors quote more for the same job if it's a bigger house in a nicer area.
I'm sure you can do what you're saying you can for those figures but most people in London will have to hunt around to get those prices and I think you'd be talking very basic.
chrisbmx116
Fox
Just because you did it doesn't mean it's possible now, prices have gone mental and continue to rise. I'm really not convinced that would be possible now without at least an element of self-build.