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Aye, we had the same, from basic internet research we expected an extension to be about 50 and a loft 45 so borrowed enough to cover both only to find it barely covered one, but in retrospect I think a smaller than once planed extension was a good idea as would hate to have an even smaller garden than I already have.
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Mortgage rates can be very cheap, but extension prices are going up, with material costs and demand.
I fully expect further material cost increases in the coming years, so if it were me, I would extend sooner rather than later.Having said that, we're not in our 'forever' house, so an extension sooner means we get to enjoy it for longer before we decide to move. Probably at least another 5-6 years, probably 9 years with the kids moving onto secondary school.
4m back, approx 8m across. Hampshire south coast. £67500 + vat, including fancy zinc roof, 3m x 1m skylight, new boiler, underfloor heating.
Not including flooring, kitchen, and decorating, which I expect will come in about £15000.
I guess about £2000 / m2, but that does include £10-15k of extra of nice bits like the zinc, underfloor and massive skylight.