I’m an ex-scaffolder, no idea of pricing as it’s twenty years since I did any but the company will want a site visit to check the ground, access, etc. After that it’s all much of a muchness really.
There is a scam sometimes done, I’ve had this tried on me, the job will require x metres of tube, y number of boards, z number of fittings which will be on the delivery/job note. When the scaffold is dismantled and taken back to the yard there’ll be x-n, etc. Actually there isn’t, it’s all there, the paperwork has just been altered, at some point in the future the materials will be taken out of the yard and used to start up a new firm! In the meantime, you, the customer gets billed for the “missing” materials. (For the OP, my run-in with this was in N. Wales – Bangor as it happens)