Which is better for building a custom home in Ontario?

A general contractor suits owners who want one point of accountability and the least day-to-day involvement. A construction manager suits owners who want earlier budget involvement, transparency into real trade pricing, and more control over decisions on a larger or more complex build — and who are comfortable holding the trade contracts. On a larger custom home, the cost visibility of construction management often outweighs the added administration.

What is the difference between agency CM and construction management at-risk?

Under agency construction management, the owner holds the trade contracts and the manager coordinates for a fee, so the owner keeps cost visibility and carries the contractual risk. Under construction management at-risk, the manager holds the trade contracts and commits to a guaranteed maximum price, which shifts more risk to the manager and, in substance, moves the role closer to a general contractor. My Home Builders works on the open-book agency model.

What does 'open book' mean in construction management?

Open book means the owner sees every real cost. On an open-book agency model you hold each trade contract in your own name, receive every quote and invoice unmarked, and pay the construction manager a disclosed management fee rather than a hidden margin. There is no lump-sum price with the builder's profit buried inside it.

My Home Builders · How We Work

Construction manager vs general contractor in Ontario

Q: What is the difference between a construction manager and a general contractor in Ontario?

A general contractor signs one lump-sum contract, holds the trade contracts, and hires and pays the trades — their margin sits inside the price and usually isn't itemized. A construction manager, on an agency model, acts as your advisor and coordinator: you the owner hold the trade contracts in your own name, you see every real quote and invoice, and you pay the manager a disclosed fee. The trade-off is control and cost visibility versus carrying more owner-side risk and administration.

In short: a general contractor gives you one lump-sum price, holds the trade contracts, and hires and pays the trades — their margin sits inside the price. A construction manager, on an agency model, works as your advisor and coordinator: you hold the trade contracts in your own name, you see every real cost unmarked, and you pay a disclosed management fee. One buys simplicity; the other buys control and cost visibility.

Side by side

	General contractor	Construction manager (agency)
Who holds the trade contracts	The contractor	You, the owner
Cost visibility	Lump sum; margin usually not itemized	Every quote and invoice, unmarked
How they're paid	Profit built into the price	A disclosed management fee
Who carries build risk	Mostly the contractor	More sits with the owner
Day-to-day involvement	Less for the owner	More for the owner (with guidance)
Best suited to	Simpler builds; owners wanting one accountable party	Larger / complex custom homes; owners wanting control and transparency

When each one fits

A general contractor is often better if you want:

One point of accountability, the least administration, and less direct exposure to trade disputes, payment issues, and lien risk. You trade cost visibility for simplicity — a reasonable choice on a first, straightforward build.

A construction manager is often better if you want:

Earlier involvement in budgeting and scheduling, transparency into real trade pricing, and more control over which trades you use and how decisions get made. On a larger or more complex custom home, that visibility usually matters more than the extra administration — especially when the systems and finishes (not the floor area) are what drive the cost.

An Ontario-specific nuance

The label matters less than the substance. Ontario courts have looked at whether a company that directly contracts with, gets quotes from, and pays the trades is really acting as a general contractor rather than a construction manager — because that distinction affects who carries the contractual and lien liability. In practice there are two forms of construction management: agency CM (the owner holds the trade contracts; the manager coordinates for a fee) and CM at-risk (the manager holds the contracts under a guaranteed maximum price, which shifts risk back toward the manager and, in substance, closer to a GC). Knowing which one you're actually signing is what protects you.

How My Home Builders works

We work on the open-book agency construction-management model. Every trade contract is in your name, you see every real quote and invoice, and we're paid a disclosed fee — never a hidden margin. We sit on your side of the table, coordinate the build and carry the day-to-day, and give you the cost visibility that a lump-sum price can't. It's the model that fits a custom home of consequence, where you want to know exactly what you're paying for.

Deciding how to structure your build?

We'll walk through which model fits your project — myhomebuilders.ca · 613 400 0785

Common questions

What's the difference between a construction manager and a general contractor?

A GC holds the trade contracts and gives you one lump-sum price with margin inside it. An agency construction manager coordinates the build while you hold the trade contracts and see every real cost, paying a disclosed fee. GC buys simplicity; CM buys control and cost visibility.

Which is cheaper?

Neither is automatically cheaper — they price differently. A GC's margin is inside the price and not shown; an agency CM's fee is disclosed and the trade costs are visible. On a larger build, seeing real, unmarked trade pricing is what tends to protect the budget.

Do I take on more risk with a construction manager?

Under the agency model, yes — because you hold the trade contracts, more contractual risk sits with you. A good construction manager's job is to manage that risk for you: vetting trades, tendering properly, and handling the day-to-day, while keeping the cost fully visible.

Note: This is a general explanation of construction delivery models in Ontario, not legal advice. Contract structure, liability, and lien exposure depend on the specific agreement — review any construction or management contract with a qualified construction lawyer before signing.