The new Building Safety Act introduces a new role of Principal Designer who will have the following legal duties.

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The essential idea here is that the Principal Designer leads on safety-focused design work and coordination during the pre-construction phase. Their role is to plan, manage and monitor the design to make sure it meets building regulations and to ensure good cooperation, communication and coordination between all dutyholders. They also liaise with the Principal Contractor to smooth the transition from design to construction.

This option best represents that design‑centred, multi‑disciplinary coordination when working with dutyholders and the Principal Contractor, which is the core function of the Principal Designer under the Building Safety Act. The other choices describe broader project management or construction‑phase responsibilities (such as overseeing the entire project or construction, or allocating work among suppliers), which are not the Principal Designer’s remit.