Subcontract agreements

The subcontract is where buyout decisions become enforceable. It must describe the scope precisely, carry down the obligations the general contractor owes the owner, set the price and how it is paid, and say what happens when things change or go wrong. CON-220 covers the law behind these clauses: contract formation, the standard form families, payment and lien statutes, pay-when-paid rules and dispute resolution. This lesson is practical. It looks at what a procurement team must get right when it prepares, negotiates and signs a subcontract, and at the clauses that cause the most trouble when they are wrong.

Standard forms and contractor forms

Subcontracts are usually based either on an industry standard form or on the contractor's own form. Standard forms have the advantage of being familiar, balanced and tested in disputes; contractor forms can be tailored to the contractor's risk appetite and prime contracts but often draw more exceptions from subcontractors.

Whatever the form, two documents should travel with it: the scope review minutes and the responsibility matrix (Lesson 4). Together with the bid package, they define what the subcontractor priced. A subcontract that says only 'Division 23 complete as per plans and specifications' leaves every disputed item to be argued later.

Flow-down: matching the prime contract

The general contractor owes the owner obligations about quality, schedule, warranties, submittals, safety, insurance, notices and disputes. Most of those obligations must be performed by subcontractors. A flow-down clause (also called a conduit or incorporation clause) binds the subcontractor to the prime contract terms that apply to its work, as if the general contractor were the owner. Without it, the general contractor can end up owing the owner something its subcontractor never promised to provide.

A blanket flow-down clause is a start, but the most important terms should be checked one by one, because a general clause may not override a specific conflicting term in the subcontract.

# Compare key subcontract terms with the prime contract (Larch Street, illustrative)
prime = {"warranty_months": 24, "notice_of_claim_days": 10, "ld_per_day": 4_000,
         "cgl_limit": 5_000_000, "submittal_review_days": 10}
sub = {"warranty_months": 12, "notice_of_claim_days": 10, "ld_per_day": 0,
       "cgl_limit": 5_000_000, "submittal_review_days": 14}
checks = {
    "warranty_months":       lambda p, s: s >= p,   # sub warranty must cover prime warranty
    "notice_of_claim_days":  lambda p, s: s < p,    # sub must notify GC before GC must notify owner
    "ld_per_day":            lambda p, s: s > 0,    # some delay damages should pass down
    "cgl_limit":             lambda p, s: s >= p,
    "submittal_review_days": lambda p, s: s >= p,   # GC needs at least the owner's review time
}
for k, ok in checks.items():
    print(f"{k:22} prime {prime[k]:>9,}  sub {sub[k]:>9,}  {'ok' if ok(prime[k], sub[k]) else 'MISMATCH'}")

warranty_months        prime        24  sub        12  MISMATCH
notice_of_claim_days   prime        10  sub        10  MISMATCH
ld_per_day             prime     4,000  sub         0  MISMATCH
cgl_limit              prime 5,000,000  sub 5,000,000  ok
submittal_review_days  prime        10  sub        14  ok

Three mismatches appear. The subcontract warranty is 12 months while the owner's is 24 (often because the warranty in the prime contract runs from substantial performance of the whole building while the trade's runs from completion of its own work). The notice period for claims is the same 10 days at both levels, which leaves the general contractor no time to receive the subcontractor's notice and pass it on; the subcontract period should be shorter. And no delay damages pass down at all. Each should be fixed before signature.

Scope, price and the schedule of values

The subcontract price is usually a lump sum (stipulated price), sometimes with unit prices for measured items. For progress billing, the subcontractor provides a schedule of values breaking the price into line items against which it bills each month. The general contractor reviews it for completeness and for front-loading: weighting early items (mobilization, shop drawings, rough-in) above their true cost so that the subcontractor is paid ahead of its work. Front-loading shifts risk to the general contractor, because if the subcontractor defaults, the money left in the subcontract may not cover the remaining work.

# Check a schedule of values for front-loading (mechanical subcontract)
sov = {  # line: (value in SOV, estimated true cost)
    "Mobilization and bonds":   (420_000,   180_000),
    "Shop drawings and BIM":    (310_000,   160_000),
    "Underground plumbing":     (480_000,   430_000),
    "Rough-in, all floors":     (1_900_000, 1_880_000),
    "Equipment set":            (1_150_000, 1_240_000),
    "Finishes and trim":        (980_000,   1_180_000),
    "Testing, balancing, startup": (240_000, 330_000),
    "Closeout and training":    (332_000,   392_000),
}
total = sum(v for v, _ in sov.values())
print(f"SOV total {total:,} (subcontract 5,812,000)")
early = ["Mobilization and bonds", "Shop drawings and BIM", "Underground plumbing"]
over = sum(sov[k][0] - sov[k][1] for k in early)
print(f"Front-loading in early lines: {over:,} = {over/total:.1%} of the subcontract")

SOV total 5,812,000 (subcontract 5,812,000)
Front-loading in early lines: 440,000 = 7.6% of the subcontract

The schedule of values adds up to the subcontract value, but the first three lines are weighted about $440,000 above their estimated cost, about 7.6 % of the subcontract, with the shortfall taken from finishes, startup and closeout. The project manager should ask for the values to be rebalanced before the first billing. A modest allowance for mobilization and bonds is normal; paying for half the closeout work in month one is not.

Payment terms and holdback or retainage

The subcontract must say when the subcontractor submits its billing, how it is certified, when it is paid, and how much is withheld. These terms interact with payment law, which differs between jurisdictions (CON-220 and CON-310).

In provinces with prompt payment legislation (including Ontario, and on federal projects under the Federal Prompt Payment for Construction Work Act), statutory timelines govern payment down the chain once the owner has received a proper invoice, and contract terms cannot override them. Statutory holdback (10 % in most provinces) is deducted at each level and released under the provincial lien or prompt payment statute. The subcontract should mirror the prime contract's invoicing dates so that subcontractor billings can be included in the general contractor's proper invoice, and should set out how disputes over amounts will be notified and adjudicated.

Changes, delays and notices

The changes clause should mirror the prime contract: who can direct a change (only named people at the general contractor), how a change is priced (lump sum quote, unit prices from the bid form, or time and materials with agreed markups), and how quickly the subcontractor must give notice of a change or claim. Notice periods should be shorter at the subcontract level than at the prime level so that the general contractor can collect, review and pass on notices in time.

# Liquidated damages: how much of the prime exposure should pass down? (illustrative)
prime_ld_per_day = 4_000
delay_days_caused_by_sub = 9
sub_value = 2_244_000
cap_pct = 0.05                         # subcontract LD cap: 5 % of subcontract value
exposure = prime_ld_per_day * delay_days_caused_by_sub
cap = cap_pct * sub_value
recoverable = min(exposure, cap)
print(f"Prime LD exposure from the subcontractor's delay: {exposure:,}")
print(f"Subcontract cap: {cap:,.0f}")
print(f"Recoverable from the subcontractor: {recoverable:,.0f}")

Prime LD exposure from the subcontractor's delay: 36,000
Subcontract cap: 112,200
Recoverable from the subcontractor: 36,000

A subcontractor cannot sensibly accept unlimited liability for the owner's liquidated damages on a building many times the value of its subcontract, and most will price or refuse such a clause. A pass-down that is proportionate (damages only for delays the subcontractor causes) and capped (here 5 % of the subcontract) is more likely to be accepted and enforced.

Insurance, indemnity and warranties

The subcontract sets the insurance each subcontractor must carry, typically commercial general liability, automobile, and for some trades professional liability (design-assist and delegated design), pollution or equipment coverage, with the general contractor and owner named as additional insureds. Certificates must be collected and checked before work starts (Lesson 3), and tracked for renewals.

Indemnity clauses allocate responsibility for third-party claims. Broad clauses that make the subcontractor indemnify the general contractor even for the general contractor's own negligence are common in contractor forms but are often restricted by statute or narrowed by courts.

Canadian courts generally enforce indemnity clauses according to their wording but read ambiguous indemnities narrowly against the party relying on them; clear words are needed to cover a party's own negligence. Provincial prompt payment and lien statutes, not the subcontract, govern holdback and statutory payment rights.

Warranties should match the prime contract in length and start date, and the subcontract should require warranty documents and manufacturer warranties to be delivered in the form the owner requires at closeout (Lesson 11).

Back-charges, default and termination

A back-charge is a deduction from a subcontractor's payments for costs the general contractor incurred because of the subcontractor, for example clean-up the trade failed to do, damage it caused, or work the contractor had to perform to keep the schedule. The subcontract should require written notice and an opportunity to cure before a back-charge is made, which both is fair and makes the back-charge enforceable. Default and termination clauses set out how the contractor can supplement a failing trade's forces, terminate for default after notice, or terminate for convenience, and what the subcontractor is paid in each case. Lesson 11 covers how these clauses are used in practice.

Exceptions and negotiation

Subcontractors often return the subcontract with exceptions: deleting a broad indemnity, limiting liquidated damages, changing payment terms. The procurement team should decide in advance which terms are firm (usually flow-downs the owner insists on, insurance, safety), which are negotiable, and who may approve changes. Exceptions accepted on one subcontract should be checked against the prime contract so that the general contractor does not give away protection it still owes the owner.