PSCS and PSDP in Ireland — Mandatory Roles Under SHWW 2013, Who Takes Them, and When
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PSCS (Project Supervisor Construction Stage) and PSDP (Project Supervisor Design Process) are mandatory under SHWW 2013.
PSCS (Project Supervisor Construction Stage) and PSDP (Project Supervisor Design Process) are mandatory under the Safety, Health and Welfare at Work (Construction) Regulations 2013 (SI 291/2013). PSDP appointed before design begins. PSCS appointed before construction starts. Both must be competent and have the resources to coordinate safety during their respective phases. On a self-build, you can take the PSCS role yourself (on direct-labour builds) or the main contractor takes it. PSDP is usually the architect. The HSA (Health and Safety Authority) can visit any site and issue improvement notices or closure orders for non-compliance. Most Irish self-builds use the architect as PSDP and the main contractor as PSCS — the standard, low-risk setup.
When this matters most
You're at the pre-construction phase and need to appoint the PSCS and PSDP.
When this doesn't apply
Both are appointed and the Commencement Notice is lodged.
Sources
Health and Safety Authority, PSCS / PSDP duties. https://www.hsa.ie/
Frequently asked questions
What is a PSCS?
Project Supervisor Construction Stage. Required by the SHWW (Construction) Regulations 2013. Responsible for safety and welfare on site during the build. Must be appointed before construction starts.
What is a PSDP?
Project Supervisor Design Process. Required by the SHWW (Construction) Regulations 2013. Responsible for coordinating safety during design. Must be appointed before design begins. Usually the architect.
Can I be my own PSCS?
Yes, on a self-build. You take on the duty. Most main contractors will require you to appoint a professional PSCS if you are direct-labour building.
When this matters most
You're at the pre-construction phase and need to appoint the PSCS and PSDP.
When this doesn't apply
Both are appointed and the Commencement Notice is lodged.
Where to go next
Next decision
The next step in your build sequence.
- Appointing a Main Contractor in Ireland — The Contract, the Insurances, and the Programme →
- Choosing a Builder in Ireland — The 10 Questions That Sort the Field →
- Final Inspection in Ireland — BCAR, Certificate of Compliance, and What Gets Signed →
- Self-Build Programme in Ireland — Gantt Chart, Critical Path, and the 9–15 Month Reality →
- Snag List Process in Ireland — The Walk-Through, the 60–180 Items, and the Fix →
- Stage Payments in a Self-Build in Ireland — Milestones, Retention, and the 5% Rule →
Branch into
Adjacent decisions at the same stage.
Watch out for
Common mistakes, hidden costs, gotchas.
- BER Assessment in Ireland — When to Get One, What It Costs, and What the Assessor Measures →
- Building Contract Types in Ireland — Fixed-Price vs Cost-Plus, and What Each Means →
- Direct Labour vs Main Contractor in Ireland — Cost, Time, Risk, and the Hybrid Route →
- Retention in a Self-Build in Ireland — 5% Held Back, When It's Released, and the Trap →
Compare with
Alternative approaches worth knowing.