The short answer
Check registration or licence where it applies, ask for comparable completed work, and confirm scope and liability in writing.
Architects and engineers have registration or licensing requirements; check the register rather than a website claim. Ask for two or three comparable completed projects and speak to those clients.
Then confirm in writing what they will deliver, how many visits or revisions are included, and whether they carry professional indemnity. A consultant who resists a written scope is a risk on any project.
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