Do You Need a Principal Designer Under Building Regulations?
May 2026
Recent changes to the Building Regulations have introduced new duty-holder roles, including the requirement to appoint a Principal Designer in certain circumstances.
Many homeowners and developers are now being asked to appoint a Principal Designer under Regulation 11D — often without fully understanding what the role involves, or whether it is required for their project.
This article explains what the role is, when it applies, and how it differs from standard Building Regulations services.
What Is a Principal Designer Under Building Regulations?
The Principal Designer is responsible for planning, managing and monitoring the design phase to ensure that the project complies with the Building Regulations. This includes: Coordinating all design work,ensuring compliance across all relevant Parts of the Regulations as well as working with structural engineers and other consultants and also providing information to Building Control.
It is a formal duty-holder role, with legal responsibilities attached.
How This Differs from Preparing Drawings? Many assume that preparing Building Regulations drawings automatically covers this requirement — but this is not always the case. Preparing drawings which is one of B-R-A’s core services typically involves:
- measured surveys
- drafting plans and construction details
- submitting applications to Building Control
Acting as Principal Designer goes further. It involves:
- overseeing the entire design process
- coordinating input from multiple parties
- taking responsibility for compliance as the design develops
In short, it is an ongoing role, not just a one-off service.
So, when Is the Principal Designer Required?
A Principal Designer is generally required where:
- more than one contractor is involved
- the project involves multiple design inputs
- the works are more complex or higher risk
Even for domestic projects, the requirement can apply depending on the scope of work, though if the work is fairly simple the client can nominate themselves for the role.
Can We Act as your Principal Designer? Yes — where appropriate, we can take on the Principal Designer role and manage the design process to ensure compliance with the Building Regulations.
This is typically offered as a separate service, reflecting the additional responsibilities involved. This matters because the introduction of duty-holder roles means there is now clear accountability for compliance. Appointing the right professional at the design stage helps to:
- avoid delays during approval
- reduce the risk of non-compliant work
- ensure a smoother, more communicative, Building Control process
The Principal Designer role under Regulation 11D is an important part of the updated Building Regulations framework. While not every project will require it, many now do — and understanding the distinction between this role and standard design services is essential.
If you require a Principal Designer, contact us HERE.