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The model shows up most on custom homes, large additions and phased renovations, where the design is still evolving when work needs to start or where the owner wants open books. It gives up the single point of responsibility that comes with a general contract in exchange for transparency and flexibility, and it shifts more of the risk onto you.
Below, construction management is compared with general contracting and design-build, followed by the risks an owner takes on, how trade contracts are organized, and the licensing, workplace insurance and site safety questions to settle before anyone starts digging. For an adviser who oversees a renovation without running the trade contracts, see the project management page.
Construction management vs general contract vs design-build: how the delivery models differ
The three models differ in who signs with the trades, who carries the price risk and how early construction can begin. The label on a proposal matters less than what the contract actually says about each of these points.
- General contract: you sign one agreement with a builder who hires and pays the subcontractors, absorbs the risk of their prices and performance, and answers to you for the whole result.
- Design-build: a single firm handles design and construction under one agreement, which simplifies communication but leaves no independent check on either the design or the price.
- Construction management as agent: the manager earns a fee for organizing the work, and each trade contract is between you and the trade, so overruns and trade failures land on you.
- Construction management at risk: the manager holds the trade contracts and may commit to a maximum price, which behaves more like a general contract with open books.
- Fast-tracking: construction management lets early packages such as demolition, excavation or foundations start while finishes are still being designed, which a fixed-price contract rarely allows.
Owner risk under construction management: price, delays, defects and gaps between trades
Under a general contract, the builder absorbs a trade that underbid, a supplier that delivers late or a subcontractor that walks off the job. Under construction management as agent, those problems come back to you. Unless the manager has agreed to a maximum price, the final cost is the sum of the trade contracts plus changes, and a late or failed trade delays every trade scheduled after it, at your expense.
Responsibility for defects is split as well. Each trade warrants its own work, which makes it harder to pin a problem such as a leak where the roofing meets the siding on any one party. Write the manager's duties precisely: reviewing each trade's scope for gaps and overlaps, checking work before it's covered and before it's paid, and keeping records that would support a claim. Ask your insurer whether your home policy still covers a property under construction or whether the project needs a builder's risk policy.
How trade contracts work under construction management
The manager's core work is turning one project into a set of well-defined trade contracts and keeping them in step. In Ontario, the Construction Act requires each payer to retain a 10 per cent holdback on the price of services or materials as they are supplied, so under an agent arrangement you retain it on every trade's payments, and the manager tracks each one separately.
- Trade packages: the work is split into packages such as excavation, framing, roofing, plumbing, electrical, drywall and finishes, each with its own drawings and written scope.
- Tendering: several trades price each package, and the manager levels the bids so exclusions and allowances are compared on equal terms.
- Contract terms: each trade signs a written contract covering scope, price, schedule, insurance, clean-up and warranty.
- Scope gaps: items that fall between packages, such as fire-stopping, patching after rough-ins or temporary heat, are assigned to someone in writing.
- Payments: each trade invoices separately, the manager verifies progress against the schedule of values, and you pay the trades directly.
- Close-out: the manager gathers each trade's warranties, manuals, inspection records and final invoice before the last payments are released.
RBQ licences and other licensing checks for construction managers
In Quebec, the RBQ's general contractor category covers any contractor whose main activity consists of organizing, coordinating, carrying out or having carried out construction work. A construction manager who organizes and coordinates the trades on your project therefore generally needs an RBQ licence, even without doing any of the work with their own hands. Ask for the licence number and check its subclasses in the RBQ's register, then repeat the check for every trade you sign with directly, since each needs a licence covering its own work.
In other provinces, the rules for builders and managers depend on the province and sometimes the municipality, so ask what applies where you build. Electrical and gas work must still be done by people holding the right provincial qualifications, and the building permit still comes from your municipality, whoever manages the job.
WSIB clearances and the constructor role on an Ontario construction-managed project
Signing trade contracts yourself brings paperwork a general contractor would otherwise handle. The WSIB treats whoever awards a construction contract as a principal, expects a clearance to be in place before the contractor starts and for as long as they work, and warns that a principal without one may be liable for the contractor's WSIB payment obligations, up to the value of the labour portion of the contract. Its policy excludes homeowners who occupy or will occupy a private residence and directly hire a contractor for exempt home renovation work only, so ask the WSIB where your project falls, and have the manager collect each trade's clearance regardless.
Ontario's Occupational Health and Safety Act gives overall authority for health and safety on a project to the constructor, defined as a person who undertakes a project for an owner, including an owner who undertakes all or part of a project by themself or by more than one employer. The province's constructor guideline explains that an owner who contracts directly with several contractors working at the same time, with no general contractor, could become the constructor, and that the owner may designate a contractor or a third party to take on the role by contract. Hiring someone only to oversee quality doesn't necessarily make them the constructor.
The Act doesn't apply to work that the owner or occupant does on their own private residence, but how it applies to a home project with several hired trades is worth confirming with the Ministry of Labour or a lawyer. Settle the question before the trades arrive and name the constructor in the construction management agreement.
Construction Management: frequently asked questions
What is the difference between a construction manager and a general contractor?
A general contractor sells you a finished result and hires the subcontractors itself. A construction manager usually sells a service: organizing the work while the trades contract with you. You gain visibility into every price and more control, but you carry more of the cost and schedule risk.
Is construction management cheaper than hiring a general contractor?
Not necessarily. You avoid the builder's markup on each trade, but you pay the manager's fee and carry the overruns a general contractor would absorb. It tends to pay off when the manager tenders well and the owner makes decisions quickly.
Who fixes a defect when trades are hired separately?
The trade whose work is defective, under its own contract and warranty. When the cause is disputed between two trades, the manager's inspection records, photos and meeting minutes are what settle it, so make keeping them part of the manager's duties.
Do I need a WSIB clearance from every trade on an Ontario project?
Whoever awards a construction contract is a principal under the WSIB's clearance policy, but homeowners hiring a contractor directly for exempt home renovation work at the residence they occupy fall outside it. Collecting clearances from every trade is still a simple way to confirm they're in good standing.
Can a construction manager guarantee the final price?
Only under an at-risk arrangement in which the manager holds the trade contracts and agrees to a maximum price. Under the more common agent model, the manager estimates and controls costs but doesn't guarantee them.
Sources
- General contractor subclasses — Régie du bâtiment du Québec
- Check a contractor's licence — Régie du bâtiment du Québec
- Clearance Certificate in Construction — WSIB
- Clearances — WSIB
- Constructor guideline — Government of Ontario
- Guide to the Occupational Health and Safety Act: Part I, application — Government of Ontario
- Government of Ontario: Construction Act, R.S.O. 1990, c. C.30 (section 22, holdback)
Written by the LokalMatch editorial team. Reviewed by Zubair Afzal on September 10, 2026. How we write and check our guides