"What preparation is needed" has a different answer for a one-bedroom flat and a five-bedroom house, and the difference is not just quantity. Some properties need things others do not.
That list applies everywhere. Everything below is what gets added on top of it.
Divan drawers and ottoman bases are the single biggest preparation variable in a house, and they are the one most often left.
A full storage bed cannot be inspected or treated properly, and emptying one takes an evening rather than ten minutes.
This is said without judgement: a room with a lot of belongings in it needs more preparation, takes longer to treat, and gives a population more places to be.
Preparation is not a test. Nobody is marking the room. What is needed is access to the bed, the furniture edges and the floor line - and the honest position on what you have and have not managed is always more useful than an apology on the doorstep.
Rough guide, for the household side of it:
Do not prepare a room weeks in advance. A room stripped and cleared for a fortnight before a visit gets gradually put back, and the household starts sleeping around the problem instead of in the room. Prepare in the two days before.
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Access to the bed from all four sides, access behind and under the furniture, and a clear floor line - plus bedding hot washed and hot dried. Everything beyond that depends on the property.
No, and you should not. Emptying a room distributes the problem into the rooms you carry things to. Clear within the room for access and keep everything inside it.
Say so before the visit rather than on the day. A technician who knows a base cannot be lifted or a room is difficult can plan for it; one who finds out on arrival cannot.
Treatment starts from £220 for the first room. Tell us how many rooms people are sleeping in, what you have found — live insects, dark spotting, cast skins — and how long it has been going on, and we will come back to you.