Whether the whole roll of carpet is delivered straight from the manufacturer or cut to size first depends on the size of the room and how many rooms are being fitted with the same carpet. Sometimes, if the amount of carpet on the roll (the cut) is similar to the room size then the whole roll might be delivered. That way, if there's a mistake in the floor measurements, there's extra carpet to work with.If the same carpet is being installed in multiple rooms, such as stairs and a landing, it will probably be cut to size in the warehouse where is plenty of space to roll it out. Some of the bigger cuts of carpet are extremely heavy and it wouldn’t be possible for the fitters to get the carpet inside your home if it wasn't cut down beforehand.