07-Str-B2 · December 2018
Nivaar worked solution (AI-drafted; not reviewed by a licensed engineer)
Paper format: National Exams, December 2018 — 07-Str-B2 Management of Construction. Three hours, closed book, one approved Casio or Sharp calculator permitted. Six questions of equal value (20 marks each); any five constitute a complete paper and only the first five that appear in the answer book are marked. All six are worked below so the paper serves as a complete revision set whichever five a candidate elects.
Reference texts: Hegazy, T., Computer-Based Construction Project Management (Prentice Hall) — activity-on-arrow and activity-on-node networks, forward and backward passes, total and free float, and the contractor cash-flow / overdraft model with mark-up, retention and payment lag; these chapters carry Questions 1 and 3. Hendrickson, C. & Au, T., Project Management for Construction (2nd ed., Carnegie Mellon) — Chapter 5 (cost estimation and unit-cost data), Chapter 8 (construction contracts and the allocation of risk), Chapter 10 (fundamental scheduling procedures) and Chapter 12 (cost control, monitoring and accounting, including project financing). Halpin, D.W. & Senior, B.A., Construction Management (4th ed., Wiley) — delivery systems, crew productivity and quantity take-off, surety bonding and lien law. R.S. Means, Building Construction Cost Data (annual) — the anatomy of a unit-price line (crew, daily output, labour-hours per unit, bare material / labour / equipment / total, and total including overhead and profit) and of the related crew table, behind Question 6. Sullivan, W.G., Wicks, E.M. & Koelling, C.P., Engineering Economy (17th ed., Pearson) — Chapters 4 and 5, the uniform-series present-worth factor and deferred annuities, used in Question 4. Canadian Construction Documents Committee, CCDC 2 Stipulated Price Contract (2020), CCDC 4 Unit Price Contract, CCDC 3 Cost Plus Contract, CCDC 14 Design-Build Stipulated Price Contract, and CCDC 220 Bid Bond, CCDC 221 Performance Bond and CCDC 222 Labour and Material Payment Bond — the Canadian contract and surety machinery behind Questions 2 and 5. Provincial lien statutes — the British Columbia Builders Lien Act (SBC 1997 c.45) and the Ontario Construction Act (RSO 1990 c.C.30, as amended 2018) — supply the Canadian equivalent of the American “mechanics lien” named in Question 5.
Check — how the two printed figures on page 2 were read. Network (Question 1): nine numbered event circles and eleven arrows, every arrow carrying a letter and a duration — A(4) 1→2, B(6) 1→4, C(2) 1→7, D(8) 2→3, E(4) 3→6, F(10) 4→5, G(16) 4→8, H(8) 5→6, I(6) 6→9, J(6) 7→8, K(10) 8→9. There is no dummy arrow on this drawing, so the translation to activity-on-node in part (c) is exact and needs no extra logic. Budget S-curve (Question 3): the six labelled markers fall squarely on months 1 to 6 of the printed axis (ticks 0 to 7). The project therefore runs six months and the budget (cost) at completion is $127,000.
Question text not reproduced: the examination questions are © Engineers and Geoscientists BC. Open the official past paper (linked at the top of this page) to read the question, then follow the worked solution below.
Both halves of this question are about the same underlying problem: construction money moves down a long chain — owner to general contractor to subcontractor to supplier to worker — and each link is exposed to the failure of the one above it. Surety bonds protect the owner at the top of that chain; liens protect everyone below the owner. It is worth stating at the outset that a bond is not insurance, despite being sold by insurers and despite the wording of the question. Insurance is a two-party contract in which the insurer accepts a risk in exchange for a premium and expects to pay claims out of the pool. A bond is a three-party instrument — principal (contractor), obligee (owner) and surety — in which the surety guarantees the principal's performance and, having paid the obligee, has a right of indemnity to recover the loss from the principal. A surety expects to pay nothing; it underwrites the contractor's competence and balance sheet the way a bank underwrites a loan.
Bid bonds. A bid bond, in Canada the standard CCDC 220 form, accompanies a tender and guarantees that if the bid is accepted the bidder will enter into the contract at the price tendered and will furnish whatever further bonds and insurance the tender documents require. It is written for a percentage of the bid price, most commonly 10 per cent, and its liability is limited to the difference between the withdrawing bidder's price and the price at which the owner must actually let the work — capped at the bond amount. Its life is short: it expires when the contract is executed, or after the tender-validity period lapses, whichever comes first. Its real function is filtering rather than compensation. A surety will not issue a bid bond to a contractor it would not stand behind for the performance bond that follows, so requiring a bid bond quietly screens out bidders who lack the financial capacity, the track record or the bonding line to carry the job — and it deters the speculative low bid whose author intends to withdraw if the number turns out to be an error.
Performance bonds. A performance bond, CCDC 221 in Canada, comes into force on award and guarantees completion of the work in accordance with the contract documents. It is normally written for 50 per cent of the contract price on public work in Canada, sometimes 100 per cent, and it runs for the duration of the contract and typically into the warranty period. Its trigger is the owner's formal declaration that the contractor is in default, after the notice and cure procedures in the contract have been followed. Once the default is established the surety may elect among remedies: complete the work itself through a completion contractor, arrange a tender to find a replacement and fund the excess cost, or simply pay the owner the lesser of its loss and the bond amount. The bond does not make the owner whole for every consequence of the default — it responds to the cost of completing the work, not usually to the owner's lost revenue or consequential damages — and the amount recoverable is capped at the penal sum.
| Bid bond (CCDC 220) | Performance bond (CCDC 221) | |
|---|---|---|
| When issued | With the tender, before award | On award, before the contract starts |
| What it guarantees | That the bidder will sign at the tendered price and post the required bonds | That the contractor will complete the work per the contract documents |
| Typical amount | 10 per cent of the bid price | 50 per cent (sometimes 100 per cent) of the contract price |
| Duration | Until execution of the contract or expiry of bid validity | Through construction and usually the warranty period |
| Trigger | Bidder refuses or fails to execute the contract | Owner declares the contractor in default after notice and cure |
| Measure of recovery | Excess cost of awarding to the next acceptable bidder, capped at the bond | Cost to complete the work, capped at the penal sum |
| Principal purpose | Screens bidders and deters withdrawal of a low bid | Protects the owner against contractor insolvency or abandonment |
A third member of the family completes the picture and is worth naming because it is what connects the bonding discussion to the lien discussion: the labour and material payment bond, CCDC 222, under which the surety guarantees that subcontractors and suppliers will be paid. It exists precisely because the performance bond protects only the owner, leaving the parties further down the chain to fend for themselves.
Construction liens — purpose. The question uses the American term “mechanics lien”; the Canadian equivalents are the builders lien in British Columbia, Alberta, Manitoba and Saskatchewan, the construction lien in Ontario, and the legal hypothec of the construction industry in Quebec. Whatever the label, the purpose is identical and it is remedial: a contractor, subcontractor, supplier or worker who improves land has, at common law, no security at all for payment, because the value of the work becomes part of the freehold the moment it is installed. If the party above them in the payment chain becomes insolvent, they lose both the money and the material. Lien legislation cures this by giving anyone who supplies work or materials to an improvement a statutory charge against the land itself, so that the person whose property has been enhanced cannot take the benefit without the improvement being paid for. Because the claimant need not be in contract with the owner, the lien reaches past the insolvent link in the chain — that is the whole point of it.
Construction liens — mechanics. The statutes work through three interlocking devices. First, the holdback: the owner must retain a fixed percentage of the value of work certified — 10 per cent under the BC Builders Lien Act and the Ontario Construction Act — in a fund available to satisfy lien claims, and each payer down the chain does the same. An owner who pays out the holdback early does not extinguish the liens; the owner simply pays twice. Second, the lien period: a claim of lien must be registered in the land title office within a short statutory window running from a defined trigger — in British Columbia, 45 days after a certificate of completion is issued for the claimant's contract or subcontract or, where none has been issued, 45 days after the head contract is completed, abandoned or terminated; in Ontario, 60 days under the current Act. Miss the window and the right is gone entirely, which is why the dates matter more than the merits in lien practice. Third, enforcement: registration alone only clouds title; the claimant must then commence an action and register a certificate of pending litigation within a further statutory period (one year in BC) or the lien expires. Because a registered lien blocks the owner's financing and sale, the practical resolution is almost always that the owner or contractor posts security — a bond or cash into court — and the lien is discharged from title, the dispute continuing against the security instead of against the land.
Both bonds and liens are best understood as answers to the same commercial fact: construction credit runs ahead of construction payment. The owner mitigates that exposure by buying a surety's balance sheet before the work starts; the trades mitigate it by holding a statutory charge on the improved land after the work is done. A candidate administering a Canadian contract needs both, together with the CCDC 222 payment bond that sits between them, and needs to diarise the lien dates from the first day of the job rather than the day a dispute arises.
