April 15, 2026 · Updated October 13, 2026

Owner's Rep vs Construction Manager vs General Contractor

The difference between an owner’s rep and a construction manager comes down to what each one is hired to deliver. A construction manager is hired to deliver the building: they organize the trades, run the site and, depending on the contract, carry some or all of the price risk. A general contractor also builds, usually for a price set on finished drawings, and it holds the subcontracts and usually the site. An owner’s representative holds no construction contract and builds nothing. It’s hired to help the owner make the owner’s decisions: setting the budget, choosing how to buy the construction, reading the contract, reviewing costs and keeping the owner’s reporting clear.

Most substantial projects in Ontario have a builder of some kind, whether that’s a general contractor or a construction manager. Whether they also need an owner’s rep depends on the people the owner already has. This article sets out who does what across the five roles owners most often confuse (owner’s rep, project manager, construction manager, general contractor and cost consultant), how the Canadian standard contracts divide the work, how each role is paid, and how to decide which combination fits your project.

The short answer: five roles, side by side

The titles overlap, and firms use them loosely. The useful questions are who each person works for, whether they hold contracts with the trades, and whether they carry the risk of the price.

Two things stand out in the table. Only the builders (the general contractor and the construction manager) ever hold trade contracts or price risk. And the owner-side roles overlap with each other more than with the builders. An owner’s rep and an owner-side project manager often do the same job, and a cost consultant does a narrower part of it in more depth.

Owner’s rep vs general contractor

A general contractor builds the project for a price. On most Ontario projects, the contract is a CCDC standard form: CCDC 2, the stipulated price contract, where the contractor builds what the drawings show for a fixed sum, or CCDC 3, where you pay the actual cost of the work plus a fee. The general contractor hires the subcontractors, buys the materials, runs the site and is responsible for how the work gets done.

The Occupational Health and Safety Act defines the constructor as the person who undertakes a project for an owner, and the constructor is responsible for site safety. The Province’s guidance is that when an owner contracts with only one contractor for all the work, that contractor is the constructor, even when it subcontracts parts of the job (Ontario, Constructor guideline). With a single general contract, one party holds the site.

An owner’s rep isn’t an alternative to a general contractor. You still need someone to build. The owner’s rep sits with you and works with the general contractor from the owner’s side of the contract. On a stipulated price job, that usually means:

• Making sure the drawings and specifications are complete enough to be priced as a fixed sum.
• Organizing the tender, levelling the bids and working through the contract terms with your lawyer.
• Reviewing each progress claim against the work in place.
• Reviewing change orders: whether it’s a change to the contract, and whether the price is in line.
• Reporting to you each month on cost, schedule and open decisions.

On a cost plus contract, the owner’s rep’s work leans more toward costs as they happen: checking invoices behind each charge, following the monthly cost report and keeping an eye on the forecast to completion. We cover what to agree before signing either type in five questions to ask before you sign a construction contract.

Where the design consultant fits

On a CCDC 2 project, the architect or engineer (the “Consultant” in the contract) usually administers the contract: certifying progress payments, reviewing the work for general conformity with the design and issuing change documents. That’s a real and important role, and an owner’s rep doesn’t replace it. The owner’s rep works on the owner’s business decisions around it: whether a change is worth making, what it does to the overall budget, and how it fits the rest of the project. CCDC 31 is the standard service contract between an owner and a consultant, and it’s worth reading alongside CCDC 2 so you can see which duties sit with the design team and which are left with you.

What a construction manager does

A construction manager is a builder who comes in earlier than a general contractor. Instead of pricing finished drawings, the CM usually joins during design, advises on cost, schedule and constructability, splits the work into trade packages, and tenders those packages as the design reaches each one. That lets the project start on site before every drawing is done, which is one of the main reasons owners choose it.

There are two kinds of construction management in Canada, and the difference between them matters more than the title.

Construction management for services (CCDC 5A)

Under CCDC 5A, the construction manager provides services only. The owner signs the trade contracts directly, usually using CCDC 17, the stipulated price contract for trade contractors on construction management projects (Miller Thomson, 2025). The CM manages those contracts on your behalf, runs the schedule and coordinates the site, and is paid a fee.

What that means for you, in practical terms:

• You hold every trade contract. A project with 20 trade packages is 20 contracts with your name on them.
• You carry the price and the risk of trade performance. If a trade defaults or a package comes in over budget, the cost sits with the project, which is you.
• You carry holdback on each contract. Ontario’s Construction Act requires the owner to hold back 10 per cent of payments to each contractor it pays directly, which under CCDC 5A means each trade.
• The constructor question needs an answer. When an owner contracts with more than one contractor, the Province’s guidance is that the owner becomes the constructor unless another party is designated to undertake the project on the owner’s behalf and assumes control (Ontario, Constructor guideline). On a CCDC 5A project, the contract should say who that is, and the site should run that way in practice.

CCDC 5A gives an experienced owner a lot of visibility and control. It also asks more of the owner’s own people, because they’re signing and paying every trade.

Construction management at risk (CCDC 5B)

Under CCDC 5B, the construction manager provides services and performs the work. The CM signs the trade contracts itself and carries responsibility for the construction, which is why this form is often called “construction manager at risk” (Miller Thomson, 2025). For the owner, CCDC 5B looks more like a general contract once the trade packages are let: one party to deal with on site, one party holding the trades, and one party who is usually the constructor.

The 2025 editions

CCDC 5A, 5B and 17 were updated in 2025, the first revision since 2010. Among the changes, the construction manager’s service fee is now split into pre-construction, construction and post-construction phases, a new “Ready-for-Takeover” milestone starts the warranty periods, and termination fees are set as agreed percentages in advance. The new editions also account for prompt payment legislation in provinces such as Ontario (Miller Thomson, 2025). If you’re looking at a CM proposal on the 2010 form, ask why, and ask your lawyer which edition suits the project. How the two forms compare on fees, cost control, holdback and liens is set out in CCDC 5A vs 5B.

Owner’s rep vs construction manager

A construction manager, even under CCDC 5A where it acts as your agent, is still a builder. Its expertise is in delivering construction: buying trade packages well, sequencing the site and getting the building finished. Good CMs are very good at that, and their input during design is worth a great deal.

An owner’s rep’s work is the part of the project that stays with the owner whatever the delivery model:

• The business case and budget. Testing the pro forma, setting a budget that includes the soft costs, and checking it at each design stage.
• The procurement decision. Whether to use a general contract, construction management, design-build or something else, and when to bring the builder in.
• The contracts. Reading the builder’s contract, and the design team’s, with your lawyer before they’re signed.
• The owner’s reporting. A monthly view of cost, schedule and open decisions, written for you and your lender or board rather than for the site team.
• The decisions. Helping you decide what to change, what to hold and what to accept, with someone beside you who has made those calls before.

When both roles are on a project, they work together closely and most of the time they agree. Where they add the most to each other is on the commercial questions: a CM’s estimate at 50 per cent design, a change order on a trade package, an extension of the schedule. The CM brings the builder’s view, the owner’s rep brings the owner’s, and you get to make the decision with both in front of you.

We’ve written up the full scope of the owner’s rep role in what an owner’s representative actually does.

What an owner’s rep doesn’t do

To keep the line clear, an owner’s rep doesn’t:

• Design or stamp drawings. The architect and engineers do that.
• Hold trade contracts or supervise trades on site. The builder does that.
• Act as the constructor under the Occupational Health and Safety Act.
• Give legal advice. An owner’s rep reads a contract from a construction point of view and works alongside your lawyer.

Where project managers and cost consultants fit

Project manager

“Project manager” is the loosest title in construction. On a builder’s team, the project manager runs the job for the contractor. On the owner’s side, a project manager or project management consultant does work that overlaps heavily with an owner’s rep, and some firms use the two titles interchangeably. “Owner-side construction management” is another name you’ll see for the same idea.

Public owners in Ontario use this model too. Infrastructure Ontario, for example, runs a Project Management Service Provider program that brings in an outside project management firm for real estate projects up to $20M (Infrastructure Ontario).

The label matters less than the terms. When you’re comparing an owner’s rep with a project manager, ask who they’re engaged by, whether they hold any construction or design contract on the project, and what they’ll deliver each month.

Cost consultant

A cost consultant, or professional quantity surveyor, prices the project independently: estimates at each design stage, a pre-tender estimate, and cost reports during construction. In Canada, the Canadian Institute of Quantity Surveyors manages the Professional Quantity Surveyor (PQS) and Construction Estimator Certified (CEC) designations (CIQS). Lenders often engage one to review each draw on a construction loan.

A cost consultant goes deeper on cost than an owner’s rep usually does, and it covers a narrower piece of the project. On larger projects the two often work together, with the owner’s rep using the cost consultant’s reports to guide budget decisions. An independent estimate is one of the most useful checks you can buy on any project, and we’ve written about why in why independent estimates pay for themselves.

Who does what, and how each is paid

Stage by stage

The table below shows how the work usually divides on a project with a design team, a builder and an owner’s rep. “Lead” is the party that does the work; “Input” is the party that reviews or advises. Your own contracts decide the details, and they’re worth checking against this list.

Read it at the start of the project for the gaps. If a line has no lead on your project, someone needs to own it, and it’s much easier to decide who before construction starts than during it.

How each role is paid

Fees vary too much by project, scope and firm for a single number to be useful, so rather than quote ranges we’ll set out how each role is usually paid. Ask for the fee in the same structure from everyone you’re comparing.

• General contractor, stipulated price (CCDC 2). One price for the work, with overhead and profit inside it. Changes are priced separately.
• General contractor, cost plus (CCDC 3). The actual cost of the work plus a fee, either a percentage or a fixed amount, sometimes with an upset price or a target.
• Construction manager, CCDC 5A. A fee for services, now split by phase in the 2025 edition, plus reimbursable expenses as the contract defines them. The trade contract prices are paid by the owner directly.
• Construction manager, CCDC 5B. A fee for services, plus the cost of the work the CM contracts for, sometimes with a guaranteed maximum price once the design is advanced.
• Owner’s rep or owner-side project manager. Usually hourly, a monthly retainer or a fixed fee for a defined task, and sometimes a percentage of construction cost. The Consulting Engineers of Ontario fee guideline prefers a time basis for project management because the scope is hard to define in advance (ACEC Ontario, 2020). For the four fee models and worked examples at three project sizes, see what an owner’s representative costs in Ontario.
• Cost consultant. Commonly a fixed fee per estimate or report, or a monthly fee for cost reporting during construction.

The builder’s fee sits inside the construction budget. The owner’s rep, design team and cost consultant are soft costs, paid by you directly. When you compare the total, compare the whole project budget, not one fee against another.

Which combination fits your project

There’s no single right answer. What fits depends on the project and, just as much, on the people you already have.

A fit-out or renovation with a general contractor

A defined scope in an existing building, with finished drawings, often suits a stipulated price general contract. The design consultant administers the contract. If you have someone in-house who has bought construction before, that may be all you need. If not, an owner’s rep for the budget, tender and contract, and perhaps a lighter role during construction, is a common setup.

A new building under construction management

Construction management tends to suit larger, more complex projects, and projects where starting on site before design finishes is worth the extra coordination. How construction management compares with design-bid-build and design-build is set out in design-build vs design-bid-build. Under CCDC 5A in particular, the owner holds every trade contract, so the owner needs people who can review trade tenders, sign and pay contracts, and follow holdback on each one. An owner without a development team usually brings in an owner’s rep for this, and often a cost consultant too.

An owner with an experienced in-house team

A developer or institution that builds regularly may have all the owner-side skills it needs. Outside help then tends to be targeted: an independent estimate, a review of a CM proposal, or extra hands during a busy stretch.

A checklist for the decision

Work through these in order:

1. Decide the delivery model first. General contract, construction management or another route, based on how complete the design is, how much schedule pressure there is and how much risk you want to hold. Our construction consulting work often starts here.
2. List the owner’s tasks. Use the stage-by-stage table above and mark each line you’ll need to lead or review.
3. Put a name beside each one. For each task, write down who in your organization will do it and how many hours a week they actually have.
4. Look at what’s left. The lines with no name, or a name with no time, are the gap.
5. Decide how to fill it. An owner’s rep for the whole gap, a cost consultant for the estimating part, or a defined piece of outside work for a single question.
6. Decide when. Owner-side help does the most good before design is finished; we cover the timing in when to bring in an owner’s rep.

Frequently asked questions

Can my construction manager also act as my owner’s rep?

A construction manager gives a lot of useful advice to the owner, especially under CCDC 5A where it acts on your behalf. It’s still a builder, though, and on the commercial questions about its own fee, schedule and pricing, many owners want a second view from someone who doesn’t hold a construction contract on the project. Whether you need that depends on how much experience your own team has.

What’s the difference between an owner’s rep and a general contractor?

A general contractor builds the project, holds the subcontracts, carries the price risk on a stipulated price contract and is usually the constructor responsible for site safety. An owner’s rep holds no construction contract. It works with the owner on the budget, the tender, the contract, costs and reporting, and works with the general contractor from the owner’s side of the table.

Can a general contractor act as my owner’s rep?

A good general contractor manages its own work well, and its advice during pricing is worth having. The owner-side role, though, is advising you on the builder’s price, its changes and its claims, so it sits more comfortably with someone who holds no construction contract on the job. That keeps the contractor free to run the work and gives you a second view on the commercial calls.

Is an owner’s rep the same as a project manager?

Often, on the owner’s side. An owner-side project manager and an owner’s rep usually do overlapping work, and some firms use the titles interchangeably. A project manager on a builder’s team is a different role: they run the job for the contractor. Ask who the person is engaged by and what they deliver each month.

Do I need an owner’s rep if I have a construction manager?

Not always. An owner with an experienced development or construction team may already have the owner-side skills it needs. An owner without one, particularly under CCDC 5A where the owner signs and pays every trade, usually benefits from someone on its side who has done that work before.

We’ve already started construction. Is it too late to bring in an owner’s rep?

No, though the work changes. During construction an owner’s rep focuses on progress claims, change orders, the schedule, reporting and closeout. The earlier decisions about the budget, the contract and procurement are already made, which is why it’s worth deciding on owner-side help before design finishes.

Getting the roles clear on your project

The most useful thing you can do early is write down who does what, using the table above, before anyone signs a contract. Many of the problems we see on projects trace back to a task nobody owned, and those are the easiest ones to prevent. If you’ve decided you want an owner’s rep and are now choosing one, when to bring in an owner’s rep covers timing and selection, and the proposal checklist in what an owner’s representative costs helps you compare firms on the same terms.

Our experience was built at PCL Constructors, on the builder’s side, and at Oxford Properties, on the owner’s, over more than 20 years and $3B+ of delivered projects. That’s the experience we bring to owner’s representation. If you’d like to talk through which roles your project needs, tell us about it.