RIBA Plan of Work Fees for Architects in the UK: How Small Practices Split Fees by Stage Without Losing Margin

RIBA Plan of Work fees in the UK are often discussed as if there is a universal percentage template every architect should follow. In practice, there is no single fee split that suits every project, every client, or every scope.

That does not mean fee structure is arbitrary.

For a small architecture practice, breaking fees down by RIBA stage is one of the clearest ways to protect margin, manage scope, and explain value to the client. It turns a headline fee into something operational. Instead of one total number floating above the project, the practice can see what each stage is meant to deliver, how much commercial room sits inside it, and where effort is starting to outrun the plan.

That matters because fee problems in architecture rarely arrive as one dramatic event. They appear gradually. Stage 2 expands through design options. Stage 3 absorbs more coordination than expected. Stage 4 starts before key decisions are settled. Stage 5 runs for months longer than anyone hoped. If the fee is still being treated as one lump sum, the practice sees the damage late. If the fee is mapped to stages, the warning signs appear much earlier.

Why Fee-to-Stage Mapping Matters So Much

The RIBA Plan of Work already provides the delivery structure most UK practices use to organise projects. It is also the most practical commercial structure available.

When fees are split by stage, a practice can answer questions that are otherwise difficult to see in time:

• where profit is supposed to be earned
• which stage is consuming more time than it should
• whether invoicing is keeping pace with delivery
• what the client is paying for at each point in the project
• when a scope conversation needs to happen before the overrun becomes permanent

This is why stage mapping matters beyond tidy proposal writing. It affects cash flow, resource planning, WIP control, and client confidence. A client is much more likely to accept a commercial conversation when the practice can show which stage has been delivered, what remains, and how the original assumptions have changed.

Are There Standard RIBA Fee Percentages?

Not in the sense many people hope for.

There is no mandatory UK-wide percentage split that says every project must allocate exactly a given proportion of the fee to each RIBA stage. The right split depends on project type, procurement route, complexity, consultant management burden, planning risk, and how much of the service the practice is actually providing.

That said, many practices do use indicative internal allocations as a starting point. A simple example on a conventional service might look something like this:

• Stages 0 and 1: a relatively small share focused on briefing and feasibility
• Stage 2: often around 10 to 20 percent of the total fee because concept work is front-loaded with options and client decision-making
• Stage 3: often around 15 to 25 percent because developed design and planning coordination take meaningful time
• Stage 4: often around 30 to 40 percent because technical design usually carries the heaviest production and coordination workload
• Stage 5: a further allocation for construction-phase involvement, which can be light or substantial depending on the appointment
• Stages 6 and 7: a small residual share where those services are included

Those are not standard tariffs. They are working assumptions. The useful lesson is not the exact percentage. The useful lesson is that Stage 4 often needs materially more fee than early design optimism allows, while Stage 2 can burn fast when the client is still deciding what they want.

The Problem With Flat-Fee Appointments That Ignore Stages

Many small practices still agree a total fee and treat the stage breakdown as secondary or invisible. That creates three problems.

First, the practice loses commercial visibility. If the fee is only monitored as one top-line number, it is hard to tell where the overrun began. The project may still look commercially acceptable overall while one stage has already consumed the margin.

Second, the client loses clarity. A stage breakdown helps the client understand what work is being delivered at each point and what triggers the move into the next phase. Without that structure, it becomes easier for expectations to blur.

Third, scope control gets weaker. If Stage 2 and Stage 3 are not commercially separated, extra concept iterations can quietly eat time that was supposed to support later work. By the time the team reaches technical design, the fee is already under pressure.

A flat fee can still be presented to the client if the practice prefers that commercially. But internally, the practice should still translate that fee into stage budgets, expected hours, and review points. Otherwise the project is being managed with less information than it needs.

How To Structure a Fee Proposal Around RIBA Stages

A good fee proposal does more than list stage headings and percentages. It defines what sits inside each stage and what has to happen before the next one starts.

At minimum, each stage should make five things visible:

• the key deliverables expected at that stage
• the commercial value allocated to that stage
• the assumptions the fee depends on
• the review or gateway needed before moving forward
• what counts as additional service rather than included service

For example, a Stage 2 concept design fee might assume one developed concept direction after an agreed briefing process, not unlimited redesign. A Stage 3 fee might assume a defined level of planning coordination, not repeated consultant rework caused by late client changes. A Stage 4 fee might assume frozen design decisions and timely consultant information, not an ongoing moving target.

This is also where response times matter. If the programme and fee assume that the client will review and sign off information within a set period, that should be written down. Delay is not neutral. It affects resource allocation and often creates unpriced rework.

The Stage-Specific Risks Directors Should Watch Closely

Stage 2: Concept design usually overruns through option drift

Stage 2 is commercially dangerous because it feels creative and flexible. Clients are still shaping ambition. Options are being tested. Feedback loops are quick. That makes it easy for the practice to keep producing work without rechecking the fee assumptions.

This is why Stage 2 often consumes more than expected. Not because the original concept is impossible, but because the project is still deciding what it wants to be. If the practice has not defined revision limits, decision gateways, and scope boundaries, a stage that looked commercially manageable can absorb senior time very quickly.

Stage 4: Technical design is where coordination pressure surfaces

Stage 4 often carries the largest fee share for a reason. It is where production intensity, consultant coordination, detail resolution, compliance requirements, and issue deadlines all converge.

If earlier design decisions are still unstable when Stage 4 begins, the technical team inherits uncertainty that the fee may not have priced. Drawings change, details move, consultant packages have to be revisited, and the practice starts spending heavily just to stabilise the project.

This is why a low technical-design allocation is such a common commercial mistake. Stage 4 is not just a documentation stage. It is often the point where previous ambiguity becomes expensive.

Stage 5: Construction can run for a long time on a thin margin

Construction-stage services are often underweighted because the visible production work has already happened. The danger is duration. Site queries, inspections, contractor coordination, design clarifications, and certification support can continue far longer than the original programme suggested.

A thin Stage 5 fee may look acceptable at appointment stage, but if the programme extends, the margin can disappear slowly over many months. This is why directors need a clear view of how construction-stage effort is being spent and whether the original assumptions still hold.

Why Stage-Based Fee Reporting Changes the Conversation

One of the biggest advantages of stage mapping is reporting.

If a client can see that Stage 3 is 80 percent complete while only 30 percent of the stage fee has been used, confidence usually rises. The project feels controlled.

If the opposite is true, the report becomes an early warning instead of a year-end surprise. Showing that 80 percent of a stage fee has been consumed while only 30 percent of the planned output is complete creates a difficult conversation, but it creates it early enough to matter. That is commercially useful. It gives the practice a chance to reset scope, reprice additional work, reallocate resources, or tighten the brief before the loss compounds.

That is the real value of fee reporting. It is not about creating more management paperwork. It is about making commercial drift visible while action is still possible.

How DeskBook Helps Practices Manage RIBA Plan of Work Fees

DeskBook is built around the way small UK architecture practices actually deliver work: by stage, by fee budget, and by live project activity rather than by disconnected spreadsheets.

Instead of storing fee plans in one place, timesheets in another, and project visibility somewhere else again, DeskBook connects them. A practice can set fee budgets by RIBA stage, log time against the correct project stage, and see how delivery effort compares to the commercial assumptions in the appointment.

That matters most when a stage starts to drift. If concept design is taking more iterations than expected, or technical design is burning senior hours faster than planned, the practice can see it before the total project fee has been exhausted. If a long construction period is creating more support time than the fee allowed for, that also becomes visible in the live picture rather than emerging months later.

For project leads and directors, that is the real operational benefit. Better fee structure at proposal stage is useful. Better stage-level visibility during delivery is what actually protects margin.

If you want a simpler way to connect fee budgets, time allocation, and progress tracking around real RIBA stages, DeskBook is built for small UK architecture practices that need clearer commercial control without heavier admin.