Principal Designer (Building Regulations)

The building regulations principal designer is the dutyholder who plans, manages and coordinates design work so it complies with the building regulations — a distinct role from the CDM principal designer, created by the post-Grenfell dutyholder regime.

Where it sits: Building Regulations 2010 (as amended 2023, dutyholder amendments from April 2024), giving effect to the Building Safety Act 2022 framework; competence expectations set through industry guidance.

Two principal designers, one project, different jobs. The CDM one owns health and safety in design; the building regulations one owns regulatory compliance — that the design, as built, will meet the Building Regulations. On higher-risk buildings the role carries sharper duties through the Building Safety Regulator\'s gateways, and on all projects the client must appoint competent dutyholders or wear the duties personally.

The practical confusion is structural: same title, different statute, sometimes the same firm, sometimes not. Appointments should say which role is being taken, on what competence basis, and what each carries — the ambiguity left unresolved at tender becomes the argument at completion, when compliance statements are due and nobody agreed who was certifying what.