A defensible quote covers unhurried time in the building, including the parts that are awkward to reach; a stated sample of flat entrance doors rather than a glance at the nearest one; photographs tied to findings; and the reasoning behind each judgement rather than a tick and a rating. It should end in an action plan with priorities that a responsible person can run, and the assessor should be available for questions after delivery. In housing, a methodology aligned to BS 9792:2025 is a good sign that the reasoning will be traceable.
Competence is part of the price too. Third-party accreditation such as BAFE SP205, FRACS or an IFE register listing is how an assessor proves that someone independent has checked their work, and since Section 156 of the Building Safety Act 2022 made choosing a competent assessor part of the duty itself, that proof has real commercial value. A competent person with credentials costs more per day than a generalist with a template, and should.