We have been quoted £400 for wallpapering (labour only) our hall, stairway & landing. Does that seem reasonable (for an average sized semi)?
It's hard to say without seeing the room or the wall paper but it could be potentially a 2-3 day job so it's around the right price for a decorator going on the fact it's going to have awkward cuts and the wall paper has a off centred pattern to match all add time to the job.
Will be cowboy job
But if any problem make sure they are serious enough to come back and fix it
That does sound reasonable yes