Most ExAC candidates have never priced a project. You have filled in timesheets, watched a principal argue about scope, and maybe seen a fee proposal go out. That is not the same as understanding how the number was built, and the exam asks you to explain it.
The objective is 12.1.7, "Explain the methods used to calculate the architect's fees." It sits under Management of the Project and Business Practice Management, which means it is Section 4 material, written on the afternoon of day two. Candidates often file fees mentally under cost management and study them with Section 1. That is the wrong drawer. Cost management is about what the building costs the client — a Section 1 topic covered in our breakdown of what each ExAC section tests. This guide is about what the architect charges.
Three methods, and when each one fits
There are three methods of compensation in Canadian practice: fixed fee, time basis, and percentage of construction cost. Projects frequently use more than one, with a different method applied to a different phase. Paying hourly for approvals work, where the time is genuinely unknowable, while documenting on a percentage basis is a common and defensible arrangement.
Fixed fee
A negotiated lump sum for services that can be sufficiently defined at the outset. It is only suitable where scope, approvals schedule, construction schedule and the other significant variables can be pinned down with reasonable accuracy. The firm builds it from an internal estimate of work hours and overhead, and it then behaves as a fixed price.
The exam relevant qualifier: a fixed fee must be adjusted if project parameters beyond the architect's control change, or if the size of the project or the scope of services increases or decreases. Fixed does not mean immovable. It means fixed against an agreed scope.
Time basis
An agreed hourly or per diem rate. This is the right instrument when services are poorly defined, preliminary in nature, or short in duration. Typical applications include pre design services, dealings with authorities having jurisdiction, partial services, conceptual design, expert witness work, renovation projects, program validation and the preparation of record drawings.
Renovation is the one worth remembering. Because existing buildings hide unknown conditions, the recommendation is to perform renovation work on a time basis, and where a percentage fee is used instead, to increase it to account for the unknowns and the design changes they force.
Percentage of construction cost
The fee is expressed as a percentage of the construction cost of the project. It is the traditional method, and the baseline scales assume design bid build delivery with complete documents and a single bid package.
Note what the percentage attaches to. Construction cost, as defined in RAIC Document 6, excludes the compensation of the architect and consultants, land cost, land development charges and other professional fees. A percentage fee calculated against the project budget rather than the construction cost would be materially wrong.
Hourly rates, multipliers and Direct Personnel Expense
Hourly billing takes two forms. The first is a straight dollar rate, set per person or per grade. The second uses a multiplier applied to a salary base, and the base matters.
There are two possible bases. A multiplier of Direct Salary Expense uses raw salary. A multiplier of Direct Personnel Expense, which is the more common of the two, uses salary plus the mandatory and customary contributions that ride along with employing someone: employment taxes and statutory benefits, insurance, sick leave, statutory holidays, vacation and pension. The multiplier applied on top covers payroll burden, office overhead and profit.
Understanding this is worth more than memorizing it. A billing rate is not a salary. If a firm bills a technologist at roughly three times raw salary, most of the difference is not margin. It is rent and utilities, software and computer maintenance, professional liability insurance, annual dues, marketing, training, depreciation, and the unbilled hours that every practice carries. The benefits are already inside Direct Personnel Expense before the multiplier is applied at all.
Rates vary across the country by region and by seniority, and should be reviewed on an agreed cycle, typically annually, to account for inflation. Overtime worked at the client's request or to meet schedule demands outside the architect's control is a separate consideration.
Blended rates
A blended rate is a single average hourly rate applied to all project hours regardless of who works them, rather than billing a principal, a project architect and a junior at three different rates.
Worth being precise here: a blended rate is a negotiated commercial simplification, not a defined term in the standard Canadian contract documents. The published fee guidance describes hourly billing as either fixed dollar rates or a multiplier on a salary base. Blending sits on top of that as a client facing convenience.
It cuts both ways. The blend is priced against an assumed staffing mix. If the project ends up demanding more senior time than assumed, the firm absorbs the difference. If it is staffed almost entirely with junior time, the client overpays. Where the mix is genuinely uncertain, separate rates by grade protect both parties better. Where the client wants a predictable number and the mix is stable, blending is reasonable and reduces invoicing friction.
Building the percentage fee
The percentage is not a single number pulled from the air. It comes off a sliding scale and is then adjusted. Understanding the sequence matters more than any individual figure.
- Identify the building category. Buildings are grouped into categories reflecting the level of architectural service the type demands. Warehouses, barns and storage buildings sit at the simple end. Multiple unit residential sits low. Schools, hospitals, laboratories, courthouses, theatres and transit terminals climb progressively. Custom residences, legislative buildings and highly specialized civic work sit at the top.
- Find the base percentage. Locate where that category meets the construction cost band. As construction value rises, the base percentage generally falls, because scale brings efficiency. Scales exist both with and without basic structural, mechanical and electrical engineering fees included, so establish which one you are reading.
- Adjust for complexity. Simple projects take a downward factor, complex projects an upward one, against the average baseline.
- Apply the fee adjustment factors. These cover enhanced scope and additional services, project delivery method, fast tracking, documentation and modelling demands, specialist consultants, approvals and authorities having jurisdiction, submittals, new technologies, extended contract administration, project location and site conditions, renovation versus new construction, repeat or repetitive designs, personnel, demobilization and remobilization, phased occupancies, and full time site presence.
- Compound and multiply. The factors are compounded together and the result multiplied against the base percentage. A project requiring nothing beyond basic services sits at a neutral multiplier of one.
The sliding scale figure is a starting point for discussion, not a price. It is explicitly not suitable for many renovation projects or for very complex or custom work.
How the fee is distributed across phases
You do not need the exact percentages, but you do need the shape, because it explains where the work actually is.
Construction documents absorbs roughly half of the total fee. Contract administration is the next largest block. Schematic design and design development are smaller and broadly comparable to one another. Bidding and negotiation is the smallest by a wide margin.
That distribution surprises people who assume design is where the effort sits. It is not. Documentation is.
Where a project uses building information modelling, the curve shifts forward. Schematic design and design development take a larger share, construction documents a correspondingly smaller one. If you can explain why, you understand the fee structure: modelling front loads the decisions, so it front loads the effort. That same logic is why early design decisions have the greatest influence on project outcomes at the lowest cost of change, and why the influence curve falls as the project advances.
Complex projects such as extensive renovations or heritage conservation shift the balance the other way, demanding more resource in documentation and contract administration.
Section 4 is the hardest section for most candidates
Fees, CCDC contracts, bonds and payment mechanics all live here. Read our free Theme 9 chapter on Bidding, Delivery Methods & Contracts to see the same depth and structure as the full guide — no signup required.
Open the Theme 9 free chapter →Why complexity multiplies rather than adds
Complexity is graded in three bands.
Simple means utilitarian in character, without complication of design, minimal finishes, and coordination of only basic structural, mechanical and electrical systems.
Average means conventional in character, requiring coordination of those structural, mechanical and electrical systems.
Complex means exceptional character and complexity of design, requiring more advanced systems and coordination of complex structural, mechanical and electrical systems, with increased integration of other disciplines such as communications infrastructure, security, high performance regenerative systems and power generation.
The reason complexity multiplies rather than adds is coordination. Each additional discipline creates an interface with every other discipline, so effort grows faster than the count of consultants. The architect as prime consultant owns those interfaces, manages the team, and ensures every member is informed of and fulfills their responsibilities.
Specialist consultants sit outside basic services. Fire protection, life safety and code, security, building envelope and information technology specialists are all coordinated by the architect whether they are retained by the architect or directly by the owner, and that coordination is compensated separately from and in addition to the base percentage, usually as a proportion of the subconsultant's own fee.
What sits outside the fee
Reimbursable expenses are direct costs incurred on the client's behalf and are not covered by the professional fee. They include authorized travel, communication and shipping, reproduction, renderings and models specifically requested by the client, special computer modelling, certification and documentation costs for third party certifications such as LEED, permit and approval fees, and additional insurance the client requests beyond what the practice normally carries. Managing them is itself a service, so they are normally billed at cost plus an administrative charge.
Three more payment provisions worth knowing for Section 4:
- Retainer. An advance payment on fees, credited against the final invoice, typically negotiated to reflect the value of the first couple of months of service or a portion of the first phase.
- Statutory holdbacks. In jurisdictions where architects have lien rights, fees may be subject to statutory holdback under provincial lien legislation. Where the client holds back and the architect provides services both before and after the work commences, the contract is deemed divided into two contracts for lien purposes. This connects directly to the holdback and substantial performance material covered in our CCDC contracts cheat sheet.
- Redesign changes. Redesign driven by changed functional requirements, reduced funding or client personnel changes is compensable, and depending on extent can approach a substantial fraction of the original fee. This is distinct from redesign the architect must perform without additional fee when the lowest bid exceeds the construction cost estimate by the threshold named in the agreement.
Common mistakes
- Studying fees with Section 1. Objective 12.1.7 is Section 4 material.
- Applying the percentage to the project budget. It attaches to construction cost, which excludes professional fees and land.
- Treating a billing rate as salary plus profit. Overhead is the largest component, and benefits are already inside Direct Personnel Expense.
- Confusing the two multiplier bases. Direct Salary Expense and Direct Personnel Expense are not the same starting figure.
- Treating the sliding scale as a price. It is a baseline for negotiation before adjustment factors are applied.
- Assuming specialist consultant coordination is included. It is compensated above the base percentage.
Key takeaways
- Three methods: fixed fee, time basis, percentage of construction cost. Projects often combine them by phase.
- Hourly rates are built from a salary base times a multiplier. Direct Personnel Expense already includes statutory benefits, so overhead and profit are the real gap between salary and billing rate.
- A blended rate is a commercial convenience, not a contractual standard. It is only fair to both sides if the actual staffing mix matches the assumption it was priced against.
- A percentage fee is base scale, then complexity, then compounded adjustment factors — never a single number read straight off a table.
- Construction documents carries about half the fee. Building information modelling shifts that weight earlier, into schematic design and design development.
- Complexity multiplies because coordination interfaces multiply, and specialist consultant coordination is compensated above the base percentage, not inside it.
Fees are Theme 12 material, so study them with the rest of Section 4 rather than alongside Section 1 estimating. Pair this with the CCDC contracts cheat sheet and the guide to general review versus inspection versus supervision, which covers the service definitions fees are attached to. Then place the theme in your 12-week study schedule. The ExAC Study Guide covers Theme 12 in full, cross referenced to RAIC Document 6, CHOP and the Stone extracts, alongside 500+ scenario-based practice questions.