Project Management

RIBA Stages Explained — A Guide for SME Clients

If you are commissioning a construction project for the first time — or working with a design and build team without a dedicated Project Manager — the RIBA Plan of Work can feel opaque. This guide breaks down each stage in plain language, explains what your consultants should be delivering at each one, and identifies the key decisions you need to make as a client.

What is the RIBA Plan of Work?

The RIBA Plan of Work is the industry standard framework for organising the process of briefing, designing, constructing and operating a building. Published by the Royal Institute of British Architects and widely adopted across the UK construction industry, it divides the project lifecycle into eight stages — Stage 0 through to Stage 7 — each with defined outcomes, key tasks and information deliverables.

Understanding the RIBA stages matters for clients because each stage requires decisions from you. If those decisions are delayed, the design programme stalls. If they are made without the right information, they tend to be revisited at significant cost. Knowing where your project is in the RIBA framework at any given time allows you to understand what your design team should be doing, what you should be reviewing, and what you need to decide before the next stage can begin.

The Eight RIBA Stages

Stage 0 — Strategic Definition

This is the pre-project stage where the business case for the project is established. The client — or their advisers — assess whether the project is the right response to the identified need, what the budget parameters are, what site or sites are being considered, and what the broad programme looks like. The output is a Strategic Brief that confirms the project is viable and worth progressing.

As a client, your key decision at Stage 0 is: Do we proceed? Is this the right project, on the right site, with a realistic budget and programme?

Stage 1 — Preparation and Brief

Stage 1 is where the project is properly set up. The design team is assembled, the detailed client brief is developed, the site is appraised, and the project governance structure is established. This is the stage at which the Project Execution Plan, Design Management Plan and Information Management Plan should be produced. The stage ends with a signed-off Initial Project Brief.

Key client decisions at Stage 1: Finalising the brief, agreeing the project team structure, approving the programme and confirming the budget envelope before design work begins in earnest.

Stage 2 — Concept Design

Stage 2 is where the design takes architectural form for the first time. The architect produces concept drawings that interpret the brief and explore the design options. Structural and M&E engineers develop initial strategies. The landscape, interior and specialist consultants begin their concept work. The output is a Concept Design that has been cost-checked against the budget and signed off by the client.

This is typically the stage at which most design changes are made — and rightly so. Changes at Stage 2 are relatively inexpensive. The same changes at Stage 4 or 5 can be extraordinarily costly.

Key client decision at Stage 2: Approving the Concept Design and confirming that it meets the brief before the team progresses to Stage 3. Do not proceed if there are unresolved brief items — they will not become easier to resolve later.

Changes at Stage 2 cost pounds. The same changes at Stage 5 cost thousands. Investing time in getting Stage 2 right is the most cost-effective decision a client can make.

Stage 3 — Spatial Coordination

Stage 3 develops the design to a level of detail sufficient for a planning application and for all the design disciplines to be coordinated spatially. The architect produces detailed drawings, the structural engineer develops the structural system, and the M&E engineers define the routes for services. BIM coordination becomes critical at this stage: clash detection between architectural, structural and MEP models is carried out to ensure everything fits before construction information is produced.

The stage output is a Developed Design, coordinated across all disciplines, accompanied by an updated cost plan and a planning application (for most projects).

Key client decision at Stage 3: Approving the Developed Design and authorising the planning application. This is also typically when the procurement strategy is confirmed and early contractor engagement begins on larger projects.

Stage 4 — Technical Design

Stage 4 is where the design is completed to the level of detail required for construction. All design information — drawings, specifications, schedules and models — is finalised and coordinated. This is the stage at which contractor procurement typically completes and design responsibility transfers to the contractor for any contractor-designed elements.

Stage 4 is often the most intense period of information production on a project. The volume of information being generated is high, the coordination demands are significant, and the consequences of errors or omissions are severe because construction is imminent.

Key client decision at Stage 4: Approving the Technical Design and authorising start on site. Most clients also need to confirm funding arrangements and any final procurement decisions at this stage.

Stage 5 — Manufacturing and Construction

This is the construction stage. The contractor is on site, the building is being built, and the project team’s role shifts from producing design information to managing the construction process. The Design Manager monitors design intent compliance, the Information Manager manages information flows between design team and contractor, and the Project Manager oversees programme, cost and quality.

Contractor design submissions — such as shop drawings, method statements and subcontractor design packages — are reviewed and approved during Stage 5. Any design changes instructed during construction are managed through the change control process established in the PEP.

Key client decisions at Stage 5: Approving variations, resolving design issues that arise during construction, and confirming readiness for Practical Completion.

Stage 6 — Handover

Stage 6 covers the period from Practical Completion through to the end of the defects liability period. The building is handed over to the client, the operation and maintenance manuals and as-built drawings are issued, and any defects identified during the liability period are rectified. On ISO 19650 projects, the Asset Information Model is finalised and handed over to the client’s facility management team.

Key client actions at Stage 6: Reviewing and accepting the O&M manuals and as-built information, identifying defects, and confirming the end of the defects liability period so the final retention can be released.

Stage 7 — Use

Stage 7 covers the operational life of the building. The project team’s involvement is typically limited after Stage 6, but Stage 7 is where the quality of the information management during construction pays dividends. A well-maintained Asset Information Model makes facilities management significantly more efficient and supports future refurbishment or adaptation work.

The Most Important Stage Gates

While all eight stages matter, three stage gates are particularly critical for SME clients:

• Stage 1 to Stage 2: Is the brief truly complete? Every unresolved brief item that carries into Stage 2 will cost more to resolve as the design develops.
• Stage 2 to Stage 3: Is the Concept Design genuinely approved, or are there still open questions? Proceeding to Stage 3 with unresolved Stage 2 issues creates rework and programme risk.
• Stage 4 to Stage 5: Is the design truly complete? Starting on site with incomplete or uncoordinated design information is one of the most common causes of cost overruns on SME projects.

How a Project Manager Helps You Navigate the RIBA Stages

The RIBA Plan of Work is a powerful tool, but it requires active management to deliver its benefits. A Project Manager ensures that each stage has clearly defined deliverables, that the design team is held to the stage programme, that client decisions are made at the right time with the right information, and that stage gates are taken seriously rather than treated as formalities.

For SME clients without in-house project management expertise, having a dedicated Project Manager embedded in the process from Stage 1 is one of the most effective investments you can make in the success of your project.