Similar to Jennys' suggestion, I'd make a cardboard template of the lid, as this is the critical dimension when turning around corners rather than the height. Double check at any pinch point and allow for stuff at low level e.g. skirtings, stair nosing etc... ETA: If you're happy to turn it on it's side (assuming it's smaller in size than the lid) then template the side rather than the lid...as long as you can turn it back before maneuvering into the space!