From searching around it seems that I should expect to pay £700 to £1500 per m2 for an extension (this is near Aylesbury, so probably over £1,000 I’m guessing).
I am planning to raise a single story double garage to two stories. I would salvage the current tiles myself, which should (baring many breakages) be sufficient for the new roof. I’m not sure that the pitch of the roof is the same as the main house, so assume the ‘A’ frames will not be reusable (unless I’m very lucky).
It would be great if anyone could help with the following:
– How often is it possible simply to build on top of the exisiting walls (I accept that an inner skin of blocks and insulation may be needed as it is currently just a garage)?
– If this is not possible due to foundations not being suitable, how much will it cost to get the old ones out and new suitable ones in?
– How much could I knock off the cost by salvaging and reusing the roof tiles myself?
Many thanks for any help