What is Stage 4 in the RIBA Plan of Work?

• A. Technical Design - detailed arch + eng design
• B. Feasibility Studies
• C. Build & Inspect
• D. Strategic Definition

Answer: (A)

Stage 4 is where the design is taken from concept into a detailed, buildable technical design. This means producing coordinated architectural and engineering drawings and specifications that specify materials, components, assemblies, and how everything fits together. It’s about finalizing all technical details so that contractors can price, procure, and construct accurately, while also ensuring the work complies with building regulations and performance requirements. Feasibility studies are done earlier to establish viability, and Strategic Definition corresponds to the initial stage; the actual construction and inspection work occur in later stages, not at Stage 4.