# Construction manager at risk vs. general contractor: which one fits your project

Johquin Yanez · Project Manager · October 2, 2026

> A plain comparison of construction manager at risk and traditional general contracting for Borderplex commercial owners: the guaranteed maximum price, open-book pricing, when you bring the builder in, and who carries the overrun.

A developer walked us through a project last year that had gone sideways before a shovel ever hit the ground. The architect had finished a full set of drawings, the owner took them to bid, and every number came back well over budget. Now they were value engineering in reverse, cutting scope out of a design they had already paid to complete, redrawing sheets, and losing a construction season. The painful part is that a builder looking at those plans at 30 percent could have flagged the cost problem months earlier, while it was cheap to fix.

That is the decision at the heart of this post. Do you bring the builder in at the very end, after the design is done, or do you bring them in early to help shape a design you can actually afford to build. Traditional general contracting is the first. Construction manager at risk is the second. Neither is better in the abstract. They fit different projects, and picking wrong costs Borderplex owners real time and money.

## How a traditional general contractor works

In the traditional model, called design-bid-build, the steps happen in a line. You hire an architect, the architect produces a complete set of drawings, and only then does the [general contractor](/) see the project, at bid. The general contractor prices the finished design as a lump sum, usually competing against other bidders, and the owner typically awards to the lowest qualified bid.

This model has real strengths. The competition is direct and easy to compare, since everyone is pricing the same finished set. The owner keeps full control over design decisions, working with the architect without a builder in the room. And the contract is simple: one price to build what the drawings show.

The weakness is timing. The general contractor first sees the project when the design is already locked, so there is no builder input while decisions are cheap to change. If the bids come back high, as they did for that developer, you are stuck redesigning after the fact. And because design must be fully complete before construction can begin, the process is linear. You cannot start the foundation while the interior is still being drawn.

## How construction manager at risk works

Construction manager at risk, usually shortened to CMAR and sometimes called CM/GC or construction manager as constructor, flips the timing. You bring the construction manager in during design, not after it.

Here the owner holds two separate contracts: one with the architect or engineer, and one with the construction manager. The CM is hired first under a preconstruction services agreement, before there is a full design to build. During that phase the CM is mainly a cost controller, giving constructability input, modeling the budget, advising on schedule, and analyzing the subcontractor market, all while the drawings are still forming.

As the design develops, the CM builds detailed cost models at milestones, commonly 30, 60, and 90 percent complete, so you can watch cost against budget the whole way. Then, near the end of design, the CM submits a guaranteed maximum price, the GMP, that locks in the ceiling. Because there is often not enough information early on for an accurate number, the parties commonly agree the CM will deliver the GMP once drawings reach roughly 80 to 90 percent complete.

Once construction starts, the CMAR acts as the general contractor. The construction manager holds the subcontracts, self-performs work like a typical GC, and carries the risk of hitting your deadline and the guaranteed maximum price.

## The two things that make CMAR different: the GMP and open book

Two features do most of the work in a CMAR arrangement, and they are worth understanding plainly.

The first is the **guaranteed maximum price**. The GMP is a ceiling. Aside from owner-directed design or scope changes, any cost overruns above the GMP are absorbed by the construction manager, not you. That caps your exposure. The GMP contract also defines how contingency gets used, and it requires your approval before the CM draws on contingency, so you are not surprised by where the money goes.

The second is **open-book pricing**. All of the CMAR's costs are open to you. You can audit what the construction manager is charging against the GMP and verify the proper costs are landing there. That transparency is a real departure from a traditional general contractor's lump-sum fee, where the internal math stays behind the curtain. On an open-book job you see the subcontractor quotes, the quantities, and the markup you agreed to.

Put together, the GMP tells you the most this job can cost, and open-book pricing lets you check that the number is honest.

## How you pick the builder is different too

The selection process is not the same, and it matters.

- **Traditional general contracting** selects on price. You take a finished design out to bid and award the lowest qualified number. Simple and competitive, but the builder had no hand in shaping the design.
- **CMAR** selects on qualifications, then negotiates the fee. You are hiring the firm for its preconstruction judgment and its ability to deliver, not just for the cheapest bid on day one. The same firm that helped develop the design commits to building it.

That early involvement is CMAR's biggest advantage and its biggest catch. The alignment is real: the builder helping shape the design is the one who has to stand behind the price. But the same arrangement creates a conflict-of-interest exposure that design-bid-build avoids, since the firm advising you on cost is also the firm that will profit from building. Owners often manage that by keeping design-bid-build's arm's-length competition where it fits, or by retaining an owner's representative, sometimes called a construction manager as agent, to watch the numbers on their behalf.

## Where design-build fits in the picture

People often lump CMAR and design-build together because both bring the builder in early, but they are not the same thing.

Under CMAR, you hold two contracts, one with the designer and one with the construction manager, and those remain separate parties giving you independent input. Under design-build, a single entity holds both the design and the construction under one contract. Design-build can be faster and gives you one point of accountability, but you give up the independent check that comes from your architect and your builder being separate. CMAR keeps that separation while still getting the builder's cost input during design.

## So which one fits your Borderplex project

Match the method to the project, not the fashion.

Lean toward **traditional general contracting** when the drawings are, or will be, fully complete before you build, the scope is well defined, and you want direct price competition. A straightforward El Paso tenant improvement, a small ground-up shell, or any job where the design is firm often prices best this way. You get clean, comparable bids on a finished set.

Lean toward **CMAR** when the project is larger or more complex, when early builder input can head off cost problems while they are cheap to fix, or when you need to compress the schedule. Because CMAR lets you release early work packages and start portions of construction before the whole design is done, it can accelerate a schedule that design-bid-build would run in one long line. On a phased renovation, a complex ground-up building, or anything where the budget is tight against an ambitious program, that early involvement usually pays for itself.

And remember what the guarantee actually covers. The GMP protects you from the construction manager's estimating and buyout risk. It does not protect you from your own changes. If you keep moving the design after the number is set, you are the one moving the number.

If you have a commercial project taking shape and you are not sure which delivery method fits, send your program, your budget target, or an early drawing set to our preconstruction team for an honest read. We will tell you plainly whether early involvement would save you money on this one, or whether a clean bid on a finished design serves you better, whether we end up doing the work or not.

## FAQ

### What is the difference between CMAR and a general contractor?

A traditional general contractor first sees your project at bid, after the drawings are finished, and holds one contract to build what the design shows. A construction manager at risk is brought in during design, gives cost and constructability input while the drawings are still forming, and then commits to a guaranteed maximum price and builds the job like a general contractor. The main difference is timing and transparency: CMAR joins early and prices open-book, a general contractor joins at the end and prices a lump sum.

### When does the CMAR give the guaranteed maximum price?

The construction manager usually submits the guaranteed maximum price near the end of design, commonly once drawings reach roughly 80 to 90 percent complete. Before that there is often not enough detail to price accurately, so the CM tracks cost against budget with cost models at design milestones like 30, 60, and 90 percent. The final guaranteed maximum price locks in the ceiling before construction ramps up.

### Who pays if a CMAR project goes over the guaranteed maximum price?

Under a guaranteed maximum price contract, the construction manager absorbs cost overruns that exceed the guaranteed maximum price, which caps the owner's exposure. The exception is owner-directed changes: if you change the design or add scope, that legitimately moves the number. So the guarantee protects you from the CM's estimating and buyout risk, not from decisions you make yourself.

### Is CMAR a good fit for a small El Paso commercial project?

Not always. CMAR earns its keep on larger or more complex projects where early builder input, phased work packages, and schedule acceleration save real money. For a straightforward El Paso tenant build-out or a small ground-up shell with complete drawings, traditional design-bid-build is often simpler and cheaper because you get competitive lump-sum bids on a finished design. The right answer depends on size, complexity, and how firm your drawings are.

Source: https://expertconstruction.group/blog/cmar-vs-general-contractor-borderplex