Silver, I am not 'in the know' but £20K would appear to be a good all in price for a large garden room requiring deep footings. I had a much smaller (14 sq metres) conservatory installed three years ago (nothing fancy) and that was £11K all in.
Off topic slightly, I am in the process of having my attached double garage converted as a disabled suite (bedroom and bathroom) for my son. I was thinking that the £25K budget (inc architects/planning) would be stretched but maybe it wont be if there are no major building works like foundations etc which I assume can be the cost drivers. I had my planning application approved last week, so hopefully the work will get through the detailed building reg process and go out to tender very soon!
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