Utilisation and Realisation in a Small Architecture Practice

Most small architecture practices are run by people who are exceptionally good at design and considerably less confident about financial management.

That is not a criticism – it is simply a reflection of how architectural education is structured and where most early-career experience is focused.

The result is that many small practices operate without a clear picture of how their time is being spent or whether the fees they charge are actually being recovered.

Two metrics sit at the heart of this problem: utilisation and realisation.

Understanding these figures – what they mean, how to calculate them, and how to act on them – is one of the most practical steps a principal can take to move their practice onto more stable financial ground.

This guide walks through both metrics in detail, with worked examples, benchmarks, and practical strategies for improvement.

What Is Utilisation in an Architecture Practice?

Utilisation measures the proportion of a person’s working time that is spent on billable project work, expressed as a percentage of total available hours.

It is not a measure of how busy someone is. A principal can work long hours and still have a low utilisation rate if most of that time is spent on business development, administration, practice management, or other non-billable activities. Utilisation is specifically about time that can be charged to a client project.

This distinction matters because non-billable time has a real cost. Every hour spent on internal tasks is an hour that cannot generate fee income, and in a small practice where the team is lean, that cost accumulates quickly.

How to Calculate Utilisation Rate

The formula for utilisation rate is straightforward:

Utilisation Rate (%) = (Billable Hours / Total Available Hours) x 100

Total available hours is typically calculated as the number of working days in a period multiplied by the standard working day length – usually 7.5 or 8 hours, depending on the practice’s contracted hours. It does not include holiday, sick leave, or public holidays.

As a worked example: if a member of staff has 160 available hours in a month and records 104 hours of billable project work, their utilisation rate is (104 / 160) x 100 = 65%.

The remaining 35% of their time – 56 hours – has been spent on non-billable activities. That might include practice meetings, CPD, marketing, and general administration. None of that time generates direct fee income.

What Is a Healthy Utilisation Rate for Small Practices?

Industry benchmarks suggest that a utilisation rate of 65-75% is a reasonable target for architectural staff in a small practice. Some sources cite 70% as a standard reference point for project architects and architectural assistants.

For principals and directors, the figure is typically lower – often in the range of 50-60% – because a greater proportion of their time is necessarily spent on practice management, client relationships, business development, and quality oversight.

Small practices tend to have lower utilisation rates than larger firms for structural reasons. With fewer people, each individual carries more overhead responsibility. A sole practitioner, for instance, must handle every non-billable function themselves, which can push billable utilisation well below 50% even when work is plentiful.

Tracking utilisation accurately is the first step toward understanding whether the practice’s fee structure adequately accounts for this reality. Guides on architecture KPIs can help practices identify which metrics to prioritise alongside utilisation.

What Is Realisation in an Architecture Practice?

Realisation measures the proportion of billable hours that are actually invoiced and recovered from clients, again expressed as a percentage.

Where utilisation asks “how much of our time is being spent on billable work?”, realisation asks “how much of that billable time are we actually getting paid for?” The two questions are related but distinct, and confusing them is one of the most common financial mistakes small practices make.

A practice can have excellent utilisation – with staff consistently recording 70% of their time on project work – and still be unprofitable if its realisation rate is poor. If large quantities of recorded billable time are written off, absorbed into fixed fees, or lost to scope creep, the revenue generated will fall well short of what the time cost suggests it should be.

How to Calculate Realisation Rate

The formula for realisation rate is:

Realisation Rate (%) = (Invoiced Fees / Total Value of Billable Hours Recorded) x 100

The total value of billable hours recorded is calculated by multiplying the number of billable hours by the practice’s charge-out rate for each member of staff.

As a worked example: if a project generates 200 billable hours recorded at an average charge-out rate of £80 per hour, the theoretical value of that time is £16,000. If the project was agreed at a fixed fee of £12,000 and that is all that is invoiced, the realisation rate is (12,000 / 16,000) x 100 = 75%.

The practice has effectively written off £4,000 of time – 25% of the value of work done. On a single project this may be manageable. Repeated across multiple projects throughout the year, it becomes a significant drag on profitability.

What Is a Healthy Realisation Rate for Small Practices?

A realisation rate of 85-95% is generally considered healthy for an architecture practice. Rates consistently below 80% typically indicate structural problems with fee setting, scope management, or both.

Small practices tend to underperform against these benchmarks for several interconnected reasons. Fixed fees are often set optimistically without detailed time analysis. Scope creep goes unmanaged because principals are reluctant to raise fee variation conversations with clients. Time is recorded inconsistently, which means write-offs are not always visible until the project is complete.

Understanding how to calculate architect fees from the outset – including realistic time allowances for each RIBA stage – is one of the most effective ways to protect realisation before a project even begins.

The Relationship Between Utilisation and Realisation

Utilisation and realisation are complementary metrics, and both must be tracked together to give an accurate picture of practice financial performance.

High utilisation with low realisation means the team is working hard on projects but not recovering the value of that work – perhaps because fees were under-priced, scope has expanded without additional fees being agreed, or time is being absorbed into fixed-price contracts that were not properly costed.

High realisation with low utilisation means the practice is recovering most of what it charges, but the volume of billable work is too low to sustain the practice’s overheads. This is sometimes seen in practices that set fees carefully but do not have enough project work in the pipeline.

The goal is to achieve both – a consistently high utilisation rate across the team combined with a strong realisation rate on each project. Together, these two figures determine the practice’s effective hourly rate: the actual revenue generated per hour of staff time, which is the single most useful indicator of whether the practice is financially sustainable.

Practices that understand the RIBA work stages in detail are better positioned to structure fee agreements that reflect the actual distribution of effort across a project, which directly supports both metrics.

Why Small Practices Struggle with These Metrics

The financial challenges specific to small architecture practices are well documented, and most of them have a direct impact on utilisation and realisation.

Principal involvement in non-billable work is one of the most significant factors. In a small studio, the founding architect is often simultaneously the lead designer, the project manager, the business development lead, the HR department, and the accounts team. This structural reality makes it very difficult to maintain high utilisation rates, however capable and efficient the principal may be.

Informal fee agreements compound the problem. Small practices frequently agree fees through brief email exchanges or verbal conversations, without detailed scope definitions or clear terms for what constitutes additional services. This creates fertile ground for scope creep and reduces the leverage a practice has when the time cost of a project begins to exceed the agreed fee.

Limited financial oversight is another common issue. Without dedicated financial management resources, many small practices only review their project finances at invoicing points – which may be monthly or at RIBA stage completion. By the time a write-off becomes visible, a substantial portion of unrecoverable time has already been spent.

The reluctance to have difficult conversations with clients about fees is perhaps the most psychologically significant factor. Many architects – particularly those running small practices where client relationships are close and personal – find it uncomfortable to raise fee variations, even when the entitlement to do so is clearly established in the contract. The result is that legitimate additional fees go unclaimed and realisation suffers.

Thinking carefully about how small architecture practices make money reveals that fee discipline and time management are as important as design quality in determining financial outcomes.

How to Improve Utilisation in a Small Practice

Improving utilisation requires a combination of accurate measurement, structural discipline, and honest assessment of how time is currently being spent.

Time Tracking and Recording

Accurate time recording is the non-negotiable foundation of utilisation management. Without it, there is no data, and without data, there is no basis for improvement.

Time should be recorded daily, not reconstructed at the end of the week from memory. Retrospective time recording is consistently less accurate and tends to underestimate the hours spent on smaller tasks, which skews both utilisation and project cost data.

Software tools such as Harvest, Toggl Track, or practice management platforms like Monograph or Rapport3 make time recording straightforward. The specific tool matters less than the habit of consistent daily entry across the whole team, including principals.

Time should be categorised clearly – distinguishing between billable project time (by project and RIBA stage), business development, internal meetings, CPD, administration, and practice management. This granularity allows the practice to understand not just the overall utilisation rate, but where non-billable time is actually going.

Structuring the Working Week

Protecting billable hours requires intentional scheduling. Non-billable activities – internal meetings, business development calls, administrative tasks – should be batched into designated slots rather than scattered through the week in ways that fragment project time.

Many small practices find that ring-fencing Monday mornings or Friday afternoons for non-billable work creates a reliable structure that improves both utilisation and the quality of project focus during the rest of the week.

Principals particularly benefit from this approach, since their time is most likely to be pulled in multiple directions simultaneously. A clear weekly template – even a loose one – creates a default framework that makes it easier to protect the hours that contribute most directly to the practice’s fee income.

Managing Non-Billable Time

Not all non-billable time is wasteful. Business development is essential for sustaining a pipeline of work. CPD is a professional obligation. Practice management cannot be eliminated. The aim is not to remove non-billable time but to manage it consciously and reduce the proportion that is unproductive.

Regular analysis of how non-billable time is distributed – by category and by individual – allows the practice to identify where time is being lost without strategic return. Excessive internal meetings, duplicated administrative effort, and reactive rather than planned business development are common culprits.

Where non-billable work can be systematised, delegated, or outsourced, the investment in doing so will generally improve utilisation rates across the team. Understanding the costs of running a small practice helps principals make informed decisions about where it makes financial sense to bring in support.

How to Improve Realisation in a Small Practice

Improving realisation is largely a matter of fee discipline – constructing better agreements at the start of a project and managing them actively throughout its duration.

Writing Robust Fee Proposals

A fee proposal that clearly defines the scope of services, the programme of work, the assumptions on which the fee is based, and the conditions under which additional fees will be charged is the single most effective tool for protecting realisation.

Many small practices produce fee proposals that describe what they will do but not what is excluded. Including a clear list of exclusions – surveys, structural engineering, planning fees, specialist consultants, additional rounds of design revision beyond those included – removes ambiguity and provides a contractual basis for raising variations when scope extends.

Fee proposals should also be built on realistic time estimates by RIBA stage. This requires historical project data, which is why consistent time recording creates a compounding benefit over time – better data from past projects enables more accurate fee setting on future ones.

Reviewing guidance on architecture fee negotiation can help principals approach these conversations with greater confidence and clarity.

Managing Scope Creep

Scope creep is the most common cause of poor realisation in small practices. It typically occurs gradually – a client requests additional design options, a planning condition triggers unforeseen work, a contractor query requires more architect input than anticipated – and each individual instance seems too small to warrant a formal conversation.

The discipline required is to recognise scope creep early and address it promptly. This means tracking project hours against the original fee budget on a regular basis, so that the point at which additional work begins to accumulate is visible before the budget is exhausted.

When additional scope is identified, it should be confirmed in writing to the client before the work is carried out, not after. A brief email noting the additional requirement, the estimated time involved, and the additional fee is sufficient in most cases. Clients who have agreed clear terms at the outset are rarely surprised by this process.

Reviewing Projects Against Budget Regularly

Mid-project financial reviews are the operational mechanism through which realisation is protected. The practice should review each active project against its fee budget at least monthly – more frequently on fast-moving or complex projects.

The review should cover: hours recorded to date versus hours budgeted for the current stage, the percentage of the stage fee that has been invoiced, any outstanding variations that have been identified but not yet agreed, and a forecast of hours required to complete the stage.

This information allows the practice to make informed decisions: to raise a variation, to have a scope conversation with the client, or – in exceptional cases – to accept a write-off and document the reason, so that the lesson can be applied to future fee setting.

A well-maintained drawing register can support project reviews by providing a clear record of deliverables produced against those originally scoped, making it easier to identify where additional output has been generated beyond the original agreement.

Practical Financial Monitoring for Small Practices

The framework for monitoring utilisation and realisation does not need to be complex to be effective. What it does need to be is consistent.

A small practice should aim to review the following on a weekly basis: time recorded by each team member, categorised by billable and non-billable, with a running utilisation rate for the week and the month to date. This takes less than thirty minutes if time recording is kept up to date.

Monthly reviews should include: utilisation rates by individual and for the practice as a whole, realisation rates by active project, a comparison of invoiced fees against hours recorded, and an updated forecast of fee income for the following two to three months based on project progress.

Quarterly, the practice should review its overall effective hourly rate – total fee income divided by total billable hours recorded – and compare this against the charge-out rates used in fee proposals. A significant gap between the two indicates that either utilisation or realisation (or both) is underperforming.

Practices considering how to grow sustainably will find that the disciplines required to monitor these metrics also support broader strategic decisions, including when to consider hiring a first employee and how to structure their role to maximise billable contribution from the outset.

The key performance indicators a practice tracks should evolve as the practice grows. Connecting utilisation and realisation data to broader business objectives – revenue targets, project pipeline health, staff capacity – creates a management dashboard that supports decision-making at every level.

Case Studies

Real practice examples illustrate how these principles operate in different studio contexts and at different scales.

Haptic Architects – Protecting Billable Time in a Small Studio

Haptic Architects, a London and Oslo-based studio known for its careful, research-driven approach to public and cultural architecture, maintains a relatively small team relative to the complexity of its project output. This places significant pressure on utilisation, since each team member carries both project and practice responsibilities.

Haptic’s approach prioritises structured project allocation – ensuring that each team member has a clear project focus rather than being spread across multiple commissions simultaneously. This reduces the context-switching cost that fragments billable time and reduces effective utilisation. It also supports deeper engagement with individual projects, which is consistent with the studio’s design values.

Witherford Watson Mann – Fee Management and Scope Control

Witherford Watson Mann, recipients of the RIBA Stirling Prize for Astley Castle, work predominantly on complex heritage and civic projects that carry significant programme uncertainty. The nature of this work – with planning processes, listed building consents, and contractor procurement all subject to delays and revisions – creates particular challenges for realisation.

The practice has developed a disciplined approach to fee structuring that accounts for programme contingency and clearly defines the conditions under which stage fees can be revisited. Their experience demonstrates that realisation on long-duration projects requires active management throughout – not just careful fee setting at the outset – and that clear client communication at each stage gate is essential to maintaining the relationship while protecting the fee.

Assemble – Non-Traditional Practice Models and Financial Metrics

Assemble, the Turner Prize-winning collective known for community-engaged projects such as Granby Four Streets, operates a practice model that deliberately challenges conventional distinctions between billable and non-billable work. Their projects often involve community co-production, speculative making, and activities that sit outside the standard RIBA service framework.

This means that conventional utilisation and realisation metrics apply differently to their context. Much of what Assemble does is funded through grants, residencies, and public commissions rather than private client fees, which changes the financial logic considerably. Their experience is a useful reminder that the metrics discussed in this guide are tools, not absolutes – they should be applied in a way that is appropriate to the practice’s specific business model and funding structure.

Tonkin Liu – Principal Time and Utilisation Challenges

Tonkin Liu, a practice led by Anna Liu and Mike Tonkin and known for poetic, structurally inventive work including the Singing Ringing Tree, exemplifies the utilisation challenges faced when practice principals are also the primary design talent and public face of the studio.

In practices of this type, the principals’ time is pulled simultaneously toward live project delivery, design research, public lectures, publications, competition entries, and client development. Each of these activities has value, but only some of it is directly billable. The result is that principal utilisation rates can be significantly lower than those of other team members, and this must be reflected in the practice’s overall fee structure and overhead recovery model. The practice’s reputation and profile – built partly through non-billable activities – feeds the pipeline that sustains it, which illustrates why non-billable time cannot simply be minimised without consequence.

Bell Phillips Architects – Building Financial Discipline in a Growing Practice

Bell Phillips Architects, a London-based practice with a strong track record in housing and community architecture, has grown from a founding studio into a practice of significant size and project complexity. That growth trajectory required the development of increasingly formal financial management structures.

In the early stages of the practice, project finances were managed informally and utilisation was not tracked systematically. As the team grew and project complexity increased, the limitations of this approach became apparent. The practice invested in proper project management systems, introduced consistent time recording, and developed regular financial review processes that gave principals visibility of utilisation and realisation data across the portfolio. Their experience illustrates a common pattern: the financial disciplines that are optional when a practice is very small become essential as it scales, and it is easier to establish them early than to retrofit them into a more complex organisation later.

Common Mistakes Practices Make with Utilisation and Realisation

Several recurring errors undermine financial performance across small practices, and most of them are avoidable once the metrics are properly understood.

Conflating utilisation with productivity is perhaps the most fundamental mistake. A busy team is not necessarily a profitable one. Practices that measure success by hours worked rather than by billable hours recorded will consistently misread their financial position.

Failing to track time accurately – or at all – makes both metrics invisible. Without time records, there is no way to calculate utilisation rates, no way to compare project hours against budgets, and no data on which to base future fee proposals. This is the single most damaging operational gap a small practice can have.

Setting fixed fees without detailed time analysis is closely related. When fees are estimated by intuition or by reference to market norms rather than built up from realistic stage-by-stage time budgets, the risk of realisation shortfalls is high from the outset.

Avoiding scope conversations with clients because they feel uncomfortable is a pattern that compounds over time. Each unaddressed scope extension reduces realisation on the current project and sets a precedent that makes future conversations harder. The earlier a variation is raised, the easier the conversation tends to be.

Finally, reviewing project finances only at invoicing points means that problems are identified too late to be corrected. By the time a stage invoice is raised, the unrecoverable time has already been spent. Regular mid-project reviews – weekly on active projects, monthly as a minimum – are the mechanism that allows course correction while it is still possible.

Conclusion

Utilisation and realisation are not back-office concerns. They are the two metrics most directly connected to whether a small architecture practice is financially sustainable, and they deserve the same level of attention that principals give to design quality and client relationships.

Understanding them requires a commitment to consistent time recording, honest analysis of where non-billable time is going, and disciplined fee management from the first proposal to the final invoice. None of this is especially complicated, but it does require habit and intention – neither of which tends to develop without a conscious decision to prioritise them.

The practices that manage these metrics well tend to have greater financial resilience, more predictable cash flow, and a clearer basis for making decisions about growth, staffing, and the types of work they pursue. They are also better equipped to have confident, transparent conversations with clients about fees – which, in turn, tends to produce better client relationships.

For principals who want to develop a more structured approach to practice management, exploring the fundamentals of starting and running an architecture firm alongside these financial disciplines provides a comprehensive foundation for building a practice that is as well designed as the buildings it produces.