ExAC Section 1 Construction Cost Questions: Using Yardsticks for Costing the Right Way

Cost questions feel intimidating on first read, but in our years of working with Intern Architects through every ExAC sitting, we have seen they are among the most predictable points to bank on Section 1. The marks live in the workflow, not in memorised numbers: the exam supplies the rates and adjustment factors, and your job is to apply the Yardsticks for Costing method correctly. Pick the right estimate class for the design phase, adjust the base rate by location factor, escalate to the construction year, then add design contingency and soft costs in that order. The strategy our team at Examitect, an independent ExAC prep platform unaffiliated with the CACB, teaches candidates is below: the workflow, a worked example, and the traps that quietly cost marks. Drill the steps, label your work, and Section 1 cost becomes one of the cleanest places on the exam to lock in a score.

Key Takeaways

What wins marks on ExAC Section 1 cost questions.

  • Cost lives in Section 1 (Design and Analysis), not Section 3. Cost management is a Section 1 category alongside programming, site analysis, schematic design, and design development. Section 3 covers sustainability and the final project scenario.
  • The exam supplies the data; you supply the workflow. Rates, location factors, escalation percentages, and soft-cost percentages are all provided in the question. Yardsticks for Costing itself lists prices city by city rather than as a base rate plus a multiplier, so memorising dollar values is wasted study time either way.
  • Class C (schematic design) is the most-tested estimate class, at plus or minus 15 to 20 percent. A Class C estimate multiplies a per-square-metre rate by gross floor area, applies location factor and escalation, and carries a design contingency before soft costs.
  • The base each percentage sits on decides the answer. Location factor and escalation both act on the rate, so their order between themselves does not matter. What does matter is that design contingency applies to the construction cost and soft costs apply to the contingency-adjusted construction cost.
  • You cannot bring Yardsticks into the exam room. Section 1 is closed book; only Section 2 is open book, and only NBC 2020 and NECB 2020 are permitted. Study from Yardsticks; calculate from the question.
  • Use metric and gross floor area, every time. Canadian cost references publish in dollars per square metre applied to GFA. Mixing GFA with NFA, or square metres with square feet, is the most common Section 1 arithmetic loss.
  • Show every step on short-answer prompts. Markers award partial credit for clearly labelled formulas, substitutions, and units, even when one arithmetic step is wrong. Drill the cost management workflow until the structure is automatic.

Overview

At a glance

SectionExAC Section 1 (Design and Analysis)
TopicConstruction cost management
Primary referenceYardsticks for Costing (Hanscomb, published by RSMeans)
Secondary referenceRSMeans (unit-price, MasterFormat)
Question formatsMultiple choice and short answer
Open book?No. Section 1 is closed book; cost data is provided in the booklet.
Most-tested classClass C (schematic design)
Calculation adjustmentsLocation factor, escalation, design contingency, soft costs
Best forIntern Architects sitting Section 1 of the ExAC

What Section 1 cost questions actually test

The Examination for Architects in Canada places cost management inside Section 1 (Design and Analysis), alongside programming, site and environmental analysis, engineering coordination, schematic design, and design development. Cost questions appear in both multiple-choice and short-answer formats, and they test the same competency from different angles: can you apply the right estimating method, at the right design phase, with the right adjustments, and label your assumptions clearly enough that a marker can follow the work.

The cost-question competency maps to four tasks that an Intern Architect handles in the first two or three years of practice: feasibility estimates at programming, schematic estimates at concept design, design-development cost checks, and budget reconciliation through to tender. The ExAC pulls scenarios from each of these phases. The scenarios are written so that the cost data you need (per-square-metre rates, location factors, escalation rates, soft-cost percentages, contingency percentages) is supplied in the question itself.

What the exam is genuinely testing:

  • Identifying the correct estimate class for a stated design phase
  • Calculating a Class C (schematic) estimate from area and rate
  • Adjusting a base rate by a location factor
  • Escalating a base-year rate to a future construction date
  • Applying design contingency at the rate appropriate for the design phase
  • Adding soft costs to produce a total project budget
  • Reading an elemental cost breakdown and identifying the cost driver
  • Showing the work, with labelled units and assumptions, on short-answer prompts

What the exam is not testing: whether you have committed Yardsticks rates to memory. The data is provided. The strategy that wins marks is to stop memorizing and start calculating. Build the workflow until you can apply it under time pressure, then bring that workflow into the exam room.

The Yardsticks for Costing structure you need to know

Yardsticks for Costing is a Canadian construction cost reference by Hanscomb; the 2014 edition on the ExAC reading list is published by RSMeans. Its defining feature is that it lists unit prices for eight major Canadian cities rather than one national set, so a city rate is read directly rather than derived from a base city and a multiplier.

By building type

Yardsticks groups projects by occupancy and complexity: offices, schools, hospitals, residential, parkades, industrial, recreational, retail. Each building type has a published cost-per-square-metre range. The range itself reflects design quality and complexity within that building type, not regional variation. A simple, single-storey office building sits near the bottom of the office range; a complex, fully serviced corporate headquarters sits near the top.

By element

Within a building type, costs are broken down into the elemental categories of the Canadian Institute of Quantity Surveyors breakdown, which is the one Yardsticks uses and the one the exam mirrors: A1 substructure, A2 structure, A3 exterior enclosure, B1 partitions and doors, B2 finishes, B3 fittings and equipment, C1 mechanical, C2 electrical, D site and ancillary work, and Z1 general requirements and fee. The elemental format is what Section 1 tests most often, because architects make cost decisions at the elemental level during schematic and design development, well before unit-price (CSI MasterFormat) costing is possible. A choice to add a curtain wall, switch from steel to concrete frame, or extend the building footprint shifts spending between elements; the elemental estimate makes that shift visible to the design team and the client.

Yardsticks also publishes the adjustment data that turns a base rate into a project-specific estimate:

  • Prices by city: Section A of Yardsticks lists unit prices for eight major Canadian cities. Where an ExAC question hands you a base rate and a location factor instead, that is the exam's own simplification, not a Yardsticks table.
  • Escalation: adjusting a base-year rate to a current or future construction date. The exam supplies the annual rate; Yardsticks itself is a snapshot of one year's prices.
  • Soft costs: design fees, permits, surveys, geotechnical, legal, financing, and FF&E, expressed as a percentage of construction cost. The phrase does not appear in Yardsticks, which prices construction work; the percentage always comes from the question.
  • Contingency ranges: design contingency by design phase, separate from construction contingency.

You will not be asked to recite any of these numbers from memory. You will be asked whether you know the structure, can identify the correct category for a given scenario, and can apply the method correctly. Read Yardsticks once for structure, then close it and move to cost-management practice questions.

Class A, B, C, and D estimates

The Canadian estimating convention organizes estimates into four classes, each tied to a design phase, an accuracy range, and a typical design contingency. Knowing which class belongs to which phase is the single most important Section 1 distinction to get right; the wrong class means the wrong method and the wrong contingency.

Class Design phase Accuracy range Typical design contingency
Class D Order of magnitude (programming, feasibility) Plus or minus 20 to 30 percent 15 to 20 percent (typical practice)
Class C Schematic design Plus or minus 15 to 20 percent 10 to 15 percent
Class B Design development Plus or minus 10 to 15 percent 5 to 10 percent
Class A Construction documents (detailed, elemental or trade-by-trade) Plus or minus 5 to 10 percent 3 to 5 percent

For the ExAC, two of these classes carry most of the question weight.

Class C (schematic design) is the most frequently tested. By schematic, the architect has a building program, a massing, and a gross floor area, but no system selection or detailed material specification. A Class C estimate multiplies a published per-square-metre rate (from Yardsticks) by the gross floor area, applies location factor and escalation, and adds a design contingency, typically in the 10 to 15 percent range, plus soft costs. CHOP 4.2 publishes the accuracy bands but not the contingency percentages, so treat the contingency figures in the table as typical practice rather than as a published standard.

Class D (order of magnitude) appears when the question describes a feasibility study or a programming phase. The method is simpler (a rate per square metre, per parking stall, per hospital bed, per student) and the contingency is higher, in the 15 to 20 percent range. Class D estimates exist to test the financial viability of a project, not to set a construction budget.

Class B and Class A estimates appear in Section 1 less often because they require more design information than a short ExAC question stem can provide. When they do appear, the question typically gives you the elemental breakdown directly and asks you to perform a check, an apportionment, or a variance analysis rather than build the estimate from scratch.

The trap, every cycle: candidates default to "elemental" without checking the design phase the scenario describes. If the question describes a feasibility study at programming, the right answer is a Class D order of magnitude, with a higher contingency, not a full elemental breakdown.

Location factors: adjusting national rates to your city

A location factor adjusts a base-city rate to the project's actual city. This is how the ExAC frames the arithmetic, and it is worth being clear that it is the exam's framing rather than the book's: Yardsticks prints prices for eight major Canadian cities directly instead of publishing a base rate and a table of multipliers. The workflow below is the one the exam asks for, using the factor the question gives you.

Application is straightforward arithmetic:

Adjusted rate = base rate × location factor

If the Yardsticks office base is $3,200 per square metre (Toronto) and the project is in Calgary with a location factor of 0.96, the location-adjusted rate is $3,200 multiplied by 0.96, or $3,072 per square metre.

Two location-factor traps show up on Section 1 every cycle:

  1. Applying the location factor twice. Candidates sometimes apply the location factor to the construction rate and then again to the soft-cost percentage or the contingency. Apply it only to the construction cost rate. Soft costs and design contingency are percentages, applied downstream of the location-adjusted construction cost.
  2. Using the wrong base city. The Yardsticks rate may be quoted as a Canadian average rather than a Toronto base, or vice versa. The question states the base. Underline it in the question stem before you start the calculation.

The location factor is supplied by the question. Yardsticks does not publish one, so there is nothing to memorise. You do need to know that it acts on the rate rather than on the contingency or the soft costs, and you do need to label it correctly in a short-answer response.

Escalation, soft costs, and contingency

Three adjustments are layered onto the location-adjusted construction cost rate. Each one has its own logic, its own base, and its own typical range. What matters is the base each percentage is applied to: escalation acts on the rate, design contingency acts on the construction cost, and soft costs act on the contingency-adjusted construction cost.

Escalation

Escalation adjusts a base-year rate to the year of construction (or the year of tender). If the Yardsticks edition is based on 2024 prices and the project tenders in 2027, you escalate three years forward at a compound annual rate, typically 3 to 5 percent in a stable construction market and higher in periods of inflation.

Compound formula:

Escalated rate = base rate × (1 + r)n

where r is the annual escalation rate and n is the number of years. A 2024 base of $3,072 per square metre escalated to 2027 at 4 percent per year: $3,072 multiplied by (1.04)3, or $3,072 multiplied by 1.124864, or $3,455 per square metre.

The ExAC question provides both r and n. Show the formula and the substitution in a short-answer response. Markers award partial credit for clearly labelled steps even when the final number contains a small arithmetic slip.

Design contingency

Design contingency is an allowance for cost uncertainty driven by design that is not yet fully developed. It is calculated as a percentage of the construction cost (rate multiplied by gross floor area, after location factor and escalation). At Class C schematic design, the typical range is 10 to 15 percent. At Class B design development, the typical range is 5 to 10 percent. At Class D order of magnitude, the typical range is 15 to 20 percent.

Note that design contingency is distinct from construction contingency. Construction contingency is an allowance carried in the construction phase, for unforeseen site or material conditions discovered after award, typically 5 to 10 percent. Both terms can appear in a Section 1 question. Apply the contingency that matches the stated phase. Mixing the two is a recurring partial-credit loss on Section 1 short answers.

Soft costs

Soft costs are the non-construction costs of the project: design fees, permits, surveys, geotechnical, legal, financing, project management, FF&E, and similar. Soft costs are usually expressed as a percentage of construction cost, with typical ranges of 15 to 25 percent depending on building type, procurement method, and fee structure. Institutional projects often sit near 20 percent. The ExAC question states the soft-cost percentage that applies; use it.

Apply soft costs to the construction cost after design contingency has been added. The convention reads: contingency on construction cost, then soft costs on the contingency-adjusted construction cost, to produce the total project budget. Apply them in the wrong order and the resulting budget is wrong by a small but visible amount; markers notice.

Worked example: a Yardsticks question, step by step

A representative Section 1 short-answer scenario:

Prepare a schematic design (Class C) cost estimate for a four-storey office building in Calgary, with a gross floor area of 4,200 m². The Yardsticks base rate for offices is $3,200/m² (Toronto, 2024 base). The Calgary location factor is 0.96. The construction tender is planned for 2027; escalate at 4 percent per year, compounded annually. Apply a design contingency of 12 percent. Soft costs are 18 percent of construction cost. Calculate the total project budget.

The workflow:

Step 1
Apply the location factor to the base rate.

$3,200/m² × 0.96 = $3,072/m²

Base city: Toronto. Project city: Calgary. The location factor stays on the rate.

Step 2
Escalate the location-adjusted rate, 2024 to 2027.

$3,072 × (1.04)3 = $3,072 × 1.124864 = $3,455/m²

Three years of compound escalation at 4 percent per year.

Step 3
Multiply by gross floor area to produce construction cost.

$3,455/m² × 4,200 m² = $14,513,254

This is the construction cost before contingency and soft costs.

Step 4
Apply design contingency (12 percent, Class C).

$14,513,254 × 1.12 = $16,254,845

This is the contingency-adjusted construction cost.

Step 5
Add soft costs (18 percent of contingency-adjusted construction cost).

$16,254,845 × 1.18 = $19,180,717

This is the total project budget before rounding.

Step 6
Round to a sensible Class C precision.

Total project budget ≈ $19.2 million

Round to a precision consistent with a Class C accuracy range. Reporting a Class C number to the nearest dollar implies an accuracy the estimate does not have.

What earned the marks on this answer: every step is labelled with units; the escalation formula is written out; the contingency sits on the construction cost only; soft costs sit on the contingency-adjusted construction cost; the final number is rounded to a precision consistent with the estimate class. Note that the location factor and the escalation factor could be applied in either order without changing the answer, because both act on the same rate.

Two failure modes to watch for: applying the soft-cost percentage to the construction cost before contingency (the soft-cost markup is too small and the total project budget is too low), and compounding contingency into the same multiplier as soft costs without labelling (a marker cannot tell which percentage was applied to which base).

Common Section 1 cost-question traps

Most of the avoidable points lost on Section 1 cost questions come from a small repeating list. Read them now so they do not surprise you on exam day.

  • Wrong estimate class for the design phase. Programming and feasibility get Class D, not Class C. Schematic gets Class C, not Class B. The question stem tells you the phase; reread it before choosing an approach. A Class C contingency applied to a Class D scenario is a recurring partial-credit loss.
  • Mixing gross and net floor area. Yardsticks rates apply to gross floor area unless the question states otherwise. Mixing GFA with NFA produces a budget that is too low by 10 to 15 percent and the marker can usually trace the error to that single step.
  • Mixing square metres and square feet. Canadian cost references publish in dollars per square metre. If a value in the question is in square feet, convert before applying the rate (1 m² = 10.7639 ft²). Convert at the start of the calculation, not in the middle of it.
  • Wrong order of adjustments. Location factor and escalation both act on the rate, then multiply by gross floor area, then design contingency on the construction cost, then soft costs on the contingency-adjusted construction cost. The two rate factors commute, so their order between themselves does not change the total. What does change the total is applying soft costs to the wrong base.
  • Wrong contingency for the design phase. A Class C schematic gets 10 to 15 percent design contingency. A Class A detailed estimate gets 3 to 5 percent. Reading the design phase wrong drives the wrong contingency.
  • Confusing design and construction contingency. Design contingency lives in the estimate during design. Construction contingency lives in the construction budget after award. Section 1 questions can test either; apply the one the question asks for.
  • Compounding contingency and soft costs. Apply contingency to construction cost. Apply soft costs to the contingency-adjusted construction cost. Stacking them into one combined percentage without labelling is a marker's worst case for awarding partial credit.
  • Reporting a Class C number to the nearest dollar. A schematic estimate has an accuracy range of plus or minus 15 to 20 percent. Reporting it as $19,180,717 implies a precision the estimate does not have. Round to two or three significant figures (about $19.2 million) and say so.
  • Unlabelled work on short-answer prompts. Markers award partial credit for clearly labelled steps. A short-answer response that shows the formulas, the substitutions, and the units almost always outscores a single-line answer with the right final number.

How to practise before exam day

Cost questions reward drilling, not reading. The hours you spend on Section 1 cost management should look like this:

  1. One reading pass on the Yardsticks structure (60 to 90 minutes). Familiarize yourself with the table of contents, the elemental categories, where the location factors live, where the time factors live, and how building types are grouped. You are not reading for retention; you are learning the lookup structure. The same pass on RSMeans is worth 30 to 45 minutes for context on unit-price estimating.
  2. 10 to 15 cost questions per study session. Mix multiple choice with short answer. Short answer is the higher-leverage practice because it forces the calculation workflow that the exam expects. Aim for at least 40 cost-specific practice questions across your Section 1 study block.
  3. Review every wrong answer to the step level. Not "I got it wrong because I rushed". The right review is: "I applied escalation before the location factor; the convention is location factor first." Then drill another question that tests the same step.
  4. One full short-answer cost question per week, written out by hand. Practise writing the calculation chain longhand, on paper, with every step labelled. The exam is on paper; the muscle memory of laying out the workflow matters more than candidates expect.
  5. A timed cost question set inside a full mock exam. A 30-minute set of 10 to 12 cost questions, taken under exam conditions, is the cleanest read on whether you are exam-ready. Build it into the mock-exam cycle in the 3-month ExAC study plan.

By the time you sit Section 1, you should have completed about 40 cost-specific questions with the calculation steps reviewed for each error, one written-out short answer per week of study, and at least one cost set inside a full timed mock exam. Candidates who skip the drilling tend to lose 5 to 10 percent of their Section 1 score on cost alone, even when they know the theory cold.

FAQ

ExAC Section 1 cost question FAQ

Yes. Section 1 (Design and Analysis) covers cost management, and cost questions appear in both multiple choice and short-answer formats. The question stems describe a building scenario, supply the rates and adjustment factors you need, and ask you to produce an estimate or interpret an elemental cost breakdown. Section 1 is closed book, so the data you need is provided inside the exam booklet rather than brought from a Yardsticks copy.

No. Only Section 2 (Codes) is open book on the ExAC, and only the NBC 2020 and the NECB 2020 are permitted in the exam room. For Section 1 cost questions, the relevant cost data (per-square-metre rates, location factors, escalation rates, soft-cost percentages) is supplied within the question itself. You should study from Yardsticks but you do not carry it into the exam.

A Class C estimate is a schematic-design cost estimate built from a published per-square-metre rate (typically from Yardsticks for Costing) applied to the gross floor area, then adjusted by location factor, escalated to the construction year, and increased by a design contingency. CHOP 4.2, citing the Canadian Construction Association, puts the accuracy range for a Class C estimate at plus or minus 15 to 20 percent. Class C is the most frequently tested estimate class on the ExAC.

The four estimate classes map to design phases. Class D is an order-of-magnitude estimate produced at programming or feasibility, with an accuracy of plus or minus 20 to 30 percent. Class C is a schematic-design estimate at plus or minus 15 to 20 percent. Class B is a design-development estimate at plus or minus 10 to 15 percent. Class A is a detailed elemental or trade-by-trade estimate produced at the construction-documents phase, with an accuracy of plus or minus 5 to 10 percent. As accuracy increases, design contingency decreases.

Multiply the base rate by the location factor before multiplying by the gross floor area. If the Yardsticks base rate for offices is $3,200 per square metre (Toronto base) and the Calgary location factor is 0.96, the location-adjusted rate is $3,072 per square metre. Apply the location factor to the construction cost rate only; do not apply it again to soft costs or contingency percentages, which are calculated downstream.

Escalation adjusts a base-year rate to a future construction year using a compound annual rate. The formula is escalated rate equals base rate multiplied by (1 plus r) raised to the power of n, where r is the annual escalation rate and n is the number of years. The ExAC question provides both r and n. A 2024 base rate of $3,072 per square metre escalated to 2027 at 4 percent per year is $3,072 multiplied by 1.124864, or $3,455 per square metre. Show the formula and the substitution; markers award partial credit for clearly labelled steps.

Soft costs typically range from 15 to 25 percent of construction cost on Canadian projects, with institutional projects often quoted around 20 percent. The ExAC question states the soft-cost percentage that applies to the scenario. Apply it to the construction cost after design contingency has been added, not before. Soft costs cover design fees, permits, surveys, geotechnical, legal, financing, and FF&E.

At Class C (schematic design), design contingency is typically 10 to 15 percent. The contingency is applied to the construction cost (rate times area) after location factor and escalation have been applied. A common Section 1 mistake is to apply a Class B or Class A contingency (5 percent or less) to a Class C scenario; the resulting estimate looks too tight for schematic design. Always check the design phase in the question stem.

Cost rates on the ExAC are quoted in dollars per square metre, applied to gross floor area in square metres. If the question gives any value in square feet, convert to square metres before applying the rate; 1 square metre equals 10.7639 square feet. Mixing gross and net floor area, or square metres and square feet, is one of the most common arithmetic errors candidates make on Section 1.

Yes, but less heavily than Yardsticks. RSMeans is a unit-price reference organized by CSI MasterFormat divisions, which group costs by trade rather than by building element. The ExAC tests elemental estimating more often than trade-by-trade pricing, because architects work at the elemental level during schematic and design development. Understand both methods, but expect most calculation questions to follow the elemental (Yardsticks) approach.

Section 1 covers six topic areas (programming, site and environmental analysis, engineering coordination, cost management, schematic design, design development), with cost management as one of those areas. Cost-specific questions typically make up 10 to 20 percent of the Section 1 question count, including one or two short-answer items in most sittings. Treat cost as worth at least one focused week of study, not an afternoon.

The most common mistake is unlabelled work. Candidates produce a final number with no calculation steps, no units, and no assumptions written out, so markers cannot award partial credit when one step contains an arithmetic slip. Write each step on its own line, with units, label every assumption (gross floor area, base rate, location factor, escalation period, contingency percentage, soft-cost percentage), and show the formula before the result. A short, structured answer with one wrong arithmetic step scores higher than a single-line answer with the right final number.