We’d have had a smart meter installed somewhat over 6 weeks ago, if it wasn’t for a problem with the “meter tails” being the old colours(!)
But the engineer confirmed that space limitations are NOT a problem in our case.
Our existing electricity meter is on the rear wall of the larder, near the bottom right of a space 26cm high (above the isolator unit and below a shelf) by 36cm wide (between pipes at the left and the consumer unit or fuse box at the right). Without the pipes we’d have an extra 16cm to the left-hand wall. There is plenty of space in front, though! Never been a problem with previous (conventional) meter changes, and it is worth noting that the original meter of 70 years ago would have been rather larger than most of the modern ones. I hope this helps.
“Above a door” is not recommended now, because of needing something to stand on to read the meter - and somebody else might want to go through that door at an awkward moment; however, this isn’t bad enough to cancel the job!
Our gas meter is on the floor of that larder, near the rear right; there’s a shelf very near to it, but apparently I won’t have to remove the shelf.