Construction Manager at Risk, usually shortened to CMAR, is a project delivery method in which the owner hires a single firm to advise during design and then build the project under a price ceiling called the Guaranteed Maximum Price. The “at risk” part means that if construction costs run over that ceiling, the construction manager pays the difference rather than the owner. The arrangement combines early-phase consulting with later-phase general contracting under one entity, which gives the owner a single point of accountability from first budget through final completion.
How It Compares to Design-Bid-Build and Design-Build
The traditional model is design-bid-build. The owner hires an architect to finish the drawings, then puts the completed design out for competitive bids. The builder enters only after design is done, so construction expertise plays no part in shaping the drawings. If the design turns out to cost more than expected, the owner finds out at bid time, when it is too late to make efficient changes.
Design-build goes the other direction. One entity handles both design and construction, which speeds up timelines because the two phases can overlap. The tradeoff is that the owner no longer has a separate architect answering only to them.
CMAR sits between the two. The owner keeps a separate architect and preserves design control, while adding a construction manager who contributes real-time cost and scheduling input during the design phase. That manager later assumes the general contractor role under a price guarantee. For complex projects where the owner wants expert construction advice during design without surrendering architectural control, this hybrid is often the point of the exercise.
What the Construction Manager Actually Does
CMAR creates a three-party relationship among owner, architect, and construction manager, and the manager’s legal position shifts partway through the project.
During design, the manager acts as an advisor representing the owner’s interests. The firm reviews the architect’s drawings for buildability, flags details that would drive up cost or create scheduling trouble, provides continuous budget estimates reflecting current labor and material prices, and builds a schedule that accounts for the lead times on equipment and materials that take months to arrive. Engaging the manager early is one of the model’s clearest advantages, because the team can issue purchase orders for critical long-lead items before the full GMP is even set, reducing exposure to price escalation and supply chain disruption.
Once the GMP is finalized, the manager’s status changes from consultant to general contractor. From that point the firm carries direct contractual responsibility for delivering the finished project. Instead of the owner coordinating a dozen trade contractors or mediating between the designer and the builder, the construction manager handles those complexities. Courts have generally evaluated this dual role based on the specific language of the contract rather than applying a universal fiduciary standard, so the rights and obligations on both sides depend heavily on what the agreement actually says.
The Guaranteed Maximum Price
The GMP is the financial backbone of every CMAR project. It represents the absolute ceiling the owner will pay for the completed work, covering labor, materials, subcontractor costs, the manager’s fee, and a contingency buffer. Parties typically formalize it using industry-standard contract forms such as AIA Document A133–2019 or ConsensusDocs 500, which spell out the scope of work, the price, and the specific conditions under which the GMP can be adjusted.1ConsensusDocs. Document Comparison Matrix
If actual construction costs come in above the GMP, the construction manager pays the difference. That exposure is the entire point of the “at risk” label. The firm loses profit, or takes a direct loss, if it mismanages the budget, picks the wrong subcontractors, or underestimates material costs. If the project finishes under the GMP, the contract states whether the savings go entirely to the owner or are split. On federal projects, the construction manager’s share of savings typically ranges from 30 to 50 percent, with higher shares reflecting greater risk taken by the contractor.2Acquisition.GOV. GSAM 536.7105-5 Shared Savings Incentive
Two line items inside the GMP deserve attention. The contingency fund covers unforeseen conditions such as unexpected soil problems or hidden structural damage in a renovation. Its size depends on how complete the design is when the GMP is set, how familiar the site conditions are, and overall project complexity. Set too low, the contingency puts the manager at serious financial risk; set too high, it makes the proposal uncompetitive. Allowances are different. They are placeholder dollar amounts for items that have not been fully specified yet, like a flooring material the owner has not chosen. When the owner picks something, the actual cost replaces the allowance; underages typically return to the owner, overages get handled as a change to the GMP.
When the GMP Can Change
The GMP is not truly fixed. It moves upward when the owner changes the scope of work, when unforeseen site conditions arise that the contract assigns to the owner, or when design errors require corrections. These adjustments are formalized through change orders, which document the revised scope, the cost impact, and any schedule extension. Both sides must agree before the number moves.
This is where disputes most often surface. The owner may argue that an issue should come out of the manager’s contingency rather than a change order. The manager may argue that incomplete design documents created costs that were not foreseeable when the GMP was set. Well-drafted contracts define exactly what counts as an owner-directed change versus what falls within the manager’s risk. If yours does not, expect arguments at every unexpected condition.
How Owners Verify Costs
Because the GMP is negotiated with one firm rather than competitively bid, the owner needs a way to confirm the numbers are real. CMAR relies on “open-book” accounting, where the construction manager discloses all subcontractor bids, material costs, and overhead so the owner can see that the price reflects actual market conditions and not inflated markups. On federal projects, open-book accounting is a formal requirement, and payments must be reconciled monthly with the accounting records and the schedule of values.3Acquisition.GOV. GSAM 536.7105-3 Accounting and Auditing Requirements
Open-book accounting only works if the owner can verify the books. Standard CMAR contracts give the owner’s auditors access to complete project records: job cost reports, subcontractor invoices, purchase orders, payroll records, and correspondence. Audits are conducted during regular business hours with reasonable notice. Most contracts allow two audit windows. An interim audit can happen midway through construction to catch accounting problems early. The closeout audit happens when the construction manager submits its final payment request, and the owner typically has 30 to 60 days to complete it. On federal contracts, the general record retention requirement is three years after final payment, with some record categories required to be kept for four.4Acquisition.GOV. Contractor Records Retention
Owners who do not exercise their audit rights leave money on the table. The entire financial premise of CMAR depends on verifiable costs, and the manager has a real incentive to classify expenses as reimbursable. A thorough closeout audit frequently finds billing errors, duplicate charges, or costs that should have been excluded from the GMP.
How CMAR Firms Are Selected
Owners generally pick a CMAR firm on qualifications rather than lowest price. The logic is practical: the manager will be advising on design decisions, setting the GMP, and running the project for months or years, so technical competence and team chemistry matter more than who offers the cheapest preconstruction fee.
The process often runs in two steps. First, the owner issues a Request for Qualifications asking firms to demonstrate relevant experience, financial capacity, and team credentials, which narrows the field to a shortlist. The shortlisted firms then respond to a Request for Proposals with a detailed plan for the specific project, including their proposed approach, preconstruction fee, construction-phase fee structure, and key personnel.5GSA.gov. RFIs, RFQs, and RFPs Evaluators score the proposals on multiple factors: track record on similar projects, experience of the specific project manager and superintendent being proposed, quality of the preconstruction approach, and safety record.
In the public sector, CMAR selection is regulated by state procurement laws that require transparency and formal scoring. Most states that authorize CMAR require public interviews, documented evaluation criteria, and a ranked shortlist before the government entity can negotiate a contract with the top-ranked firm. Some jurisdictions set a minimum project dollar threshold before CMAR becomes available at all, ranging from no minimum to over $1 million depending on the state.
Bonding and Insurance
Because the construction manager carries significant financial risk, CMAR projects require robust bonds and insurance. Performance bonds guarantee the owner that the project will be completed even if the manager defaults. Payment bonds guarantee that subcontractors and material suppliers get paid. Under the Miller Act, any federal construction contract exceeding $100,000 requires both.6Office of the Law Revision Counsel. 40 US Code 3131 – Bonds of Contractors of Public Buildings or Public Works For federally funded projects administered by non-federal entities, performance and payment bonds at 100 percent of the contract price are required for construction contracts above the simplified acquisition threshold, currently $350,000.7eCFR. 2 CFR 200.326 – Bonding Requirements
Beyond bonds, the manager needs commercial general liability coverage for bodily injury and property damage on the job site. Large commercial and government projects commonly require $2 million or more per occurrence. CMAR firms also carry professional liability insurance, sometimes called errors and omissions, specifically for the preconstruction advisory phase. Standard general liability policies do not cover economic losses caused by bad advice during budgeting or constructability review. If the manager’s cost estimate turns out to be materially wrong and the owner relied on it to set the project budget, that is a professional liability exposure, not a general liability one.
Where CMAR Falls Short
CMAR is not the right fit for every project. The model works best for complex projects where early construction input genuinely adds value. For straightforward projects with a well-defined scope and a healthy market of qualified contractors, traditional competitive bidding may deliver a lower price with less administrative overhead.
The biggest structural risk is setting the GMP before the design is complete. Owners often push for an early GMP to lock in a price, but if only 60 or 70 percent of the design is finished, the contingency and allowances have to be large enough to cover everything not yet defined. A construction manager working against a tight GMP and incomplete drawings has reason to resist design development, interpret ambiguous details the cheapest way, or pursue aggressive change order claims. Quality can suffer when the firm’s financial survival depends on holding costs below an artificially early ceiling.
There is also less price competition than in design-bid-build. Because the GMP is negotiated with a single firm rather than bid across several, the owner relies on the open-book process and on their own cost-estimating capability to judge whether the price is fair. Owners without sophisticated in-house construction knowledge, or an independent cost consultant, can end up accepting a GMP higher than competitive bidding would have produced.