Construction Delivery Methods: GC vs CM at Risk vs Design-Build
Updated: Sep 20
Almost every owner I meet has already picked a delivery model before they have picked a builder. Usually they picked it because it is what they used last time, or because someone in the room said it was the safest option. That is not a decision, it is a habit.
The three construction delivery methods most commercial owners in Ontario will actually choose between are the traditional general contractor route, construction management at risk, and design-build. They are not better or worse than each other. They allocate risk, price certainty and control in different places, and the right one depends on what you know about your project on the day you sign.
There is a fourth arrangement worth naming, because tenants meet it constantly: a landlord turnkey delivery, where the landlord holds the contract and you are not the owner.
The three construction delivery methods, in plain language
Design-bid-build with a general contractor
You hire a design team. They take the drawings to a finished state. You tender those drawings, contractors bid a fixed price, and you sign with the lowest compliant bidder. Design and construction are two separate contracts with two separate parties, and they do not overlap.
What you get: a hard number, a competitive market test, and drawings you own outright before anyone swings a hammer. What you give up: time, because nothing is built until the design is finished, and a single point of responsibility, because when the drawings and the field disagree, the designer and the builder are looking at each other, not at you.
Construction management at risk
You hire a construction manager early, during design, for a fee. They advise on constructability, pricing and sequencing while the drawings develop. At some point, usually around the end of design development, they convert to a guaranteed maximum price and take on the build risk.
What you get: early builder input, the ability to start site work or long-lead procurement before the drawings are 100 per cent complete, and an open-book view of the costs. What you give up: price certainty until the GMP is set, which can be well into the project. If the GMP arrives over budget, you are redesigning with a contractor already on the payroll.
Design-build
You hire one entity for both design and construction. They carry the design consultants, they carry the trades, and they carry the obligation to deliver a building that performs, not just a building that matches a drawing.
What you get: one contract, one throat to choke, overlapping design and construction, and a price that gets firm earlier than in CM at risk. What you give up: some control over design detail, and the ability to compare apples to apples at the bid stage, because two design-build teams will propose two genuinely different buildings.
A fourth arrangement: landlord turnkey delivery
If you are a tenant rather than an owner, none of the three methods above are actually yours to choose. In a landlord turnkey delivery, the landlord holds the construction contract, selects the design and construction team, and hands you the finished space under the lease. You get a fit-out with no procurement to run and no construction risk to carry, but you also give up most of an owner's control: you are negotiating a workletter and an allowance, not a scope of work, and your recourse if something goes wrong runs through the lease, not a construction contract you signed. It is worth naming here because tenants meet it constantly and often assume it behaves like design-build. It does not, because you are not the client of record, and the four decision factors below are not yours to apply.
How to choose between construction delivery methods
Forget the marketing. There are four practical questions that decide this.
1. How well do you know what you want?
If your program is fully defined, your standards are written, and the building is a type you have built before, design-bid-build works well and will get you a sharp price. If your program is still moving, if you are solving a problem rather than reproducing a known solution, a fixed tender on incomplete drawings is a change-order machine. Design-build or CM at risk absorbs that movement far better.
2. What is the real cost of a month?
Be specific. A month of delay on a leased space with a fixed occupancy date has a dollar number attached: rent on two premises, a lease penalty, deferred revenue. A month on a facility that has no hard deadline costs carrying charges and nothing else. When a month is expensive, overlapping design and construction is worth paying for. When a month is cheap, sequencing them and taking a competitive tender is usually the better economics.
3. Where does design risk belong?
In design-bid-build, you own the design. If the drawings are wrong, incomplete or uncoordinated, that is your risk and your cost, and your recourse is against your consultant. In design-build, the builder owns design adequacy. That single difference is worth more than most owners realise on technically complex projects, and it is the reason design-build is common for industrial, institutional and performance-driven facilities.
4. How much do you want to be in the room?
CM at risk demands the most owner involvement, because you are making decisions continuously while the design and the price develop together. Design-bid-build is front-loaded: heavy involvement during design, much lighter during construction. Design-build sits in between, with defined decision points rather than continuous participation. Pick the one that matches the time you actually have, not the time you wish you had.
The comparison that actually matters
Price certainty, earliest to latest: design-bid-build (at tender), design-build (at contract), CM at risk (at GMP).
Schedule, fastest to slowest: design-build, CM at risk, design-bid-build.
Owner control over design detail, most to least: design-bid-build, CM at risk, design-build.
Single-point responsibility: design-build only. The other two split design and construction liability by definition.
Cost transparency during the work: CM at risk is open-book by design; design-build and stipulated-price GC work are not, unless you negotiate it.
Where owners get this wrong
The most common mistake is choosing design-bid-build for price certainty and then tendering drawings that are not finished. You do not get a fixed price on an unfinished design. You get a low number followed by a claims process, and the claims are legitimate, because the contractor priced what you showed them.
The second most common mistake is choosing design-build and then trying to specify every detail anyway. If you write a prescriptive specification for a design-build contract, you have taken back the design risk without meaning to and paid a design-build premium for the privilege. Write performance requirements, not prescriptions, and let the team solve them.
The third is hiring a construction manager early and never converting to a GMP, so you drift into a cost-plus project without the governance a cost-plus project needs. Decide up front what triggers conversion and what happens if the GMP comes in high.
The honest summary
Construction delivery methods are a risk allocation choice, not a procurement preference. Define what you know, price the value of a month, decide who should own design adequacy, and be honest about how involved you can be. The answer usually becomes obvious once those four things are written down.
Common questions about construction delivery methods
What are the main construction delivery methods in Ontario?
Design-bid-build with a general contractor, construction management at risk, and design-build. A landlord turnkey delivery is a fourth arrangement tenants meet constantly, where the landlord holds the contract and you are not the owner.
Which delivery method gives the most price certainty?
Design-bid-build, but only if the drawings are genuinely finished when you tender. Design-build firms up at contract and CM at risk at the guaranteed maximum price. Tendering unfinished drawings buys you a low number and a change order file.
Which delivery method is fastest?
Design-build, then CM at risk, then design-bid-build. Design-build overlaps design and construction and lets long-lead procurement start earlier, which is where the time actually comes from.
Who carries the design risk?
In design-bid-build you do. If the drawings are wrong or uncoordinated, that is your cost and your recourse is against your consultant. In design-build the builder owns design adequacy, which is the single biggest difference on technically complex projects.
If you are weighing delivery models on a specific project and want an independent read before you commit, that is exactly the kind of conversation worth having early. You can see how I work with owners and project partners on project solutions.
This article is general information about commercial construction practice in Canada, not legal advice. Have your own counsel review your contract.
Connect with Carolee on LinkedIn: linkedin.com/in/carolee-w-turner-2002417
Comments