Contract Types and Risk Sharing

Why This Topic Matters
In the CMAA Certified Construction Manager (CCM) exam, Contract Administration is one of the core domains, and within it, Contract Types and Risk Sharing is a foundational concept. Every decision a Construction Manager makes about payment, change orders, schedule enforcement, claims, and closeout flows directly from how the contract was structured and how risk was allocated among the Owner, the Designer, and the Contractor. The CM's professional obligation under the CMAA Standards of Practice is to advise the Owner on the contract strategy that best fits the project's goals, the maturity of the design, the market, and the Owner's tolerance for risk. If you understand who carries what risk under each contract type, you can reason your way through a large portion of the exam questions even when the scenario is unfamiliar.

What Is a Contract Type?
A contract type (sometimes called the pricing or payment basis) defines how the contractor will be compensated and therefore which party absorbs the consequences when actual costs, quantities, or durations differ from what was expected. Do not confuse contract type with project delivery method. Delivery method (Design-Bid-Build, CM at-Risk, Design-Build, Multiple Prime, Integrated Project Delivery, CM Agency) describes the relationships and sequence among the parties. Contract type describes the money. A single delivery method can use several contract types; for example, a CM at-Risk project typically ends in a Guaranteed Maximum Price, but its early preconstruction services may be paid on a fee or cost-reimbursable basis.

The Risk-Sharing Spectrum
The easiest way to organize this topic is as a continuum from maximum contractor risk to maximum owner risk:

1. Lump Sum (Fixed Price / Stipulated Sum)
The contractor agrees to perform a defined scope for a single fixed amount. The contractor bears nearly all cost risk: labor productivity, material prices, means and methods, and estimating errors. The Owner bears design risk (errors, omissions, and changes to scope) and risks expressly retained by the contract such as differing site conditions. Best suited when design documents are essentially complete (typically 90 to 100 percent), scope is well defined, and the Owner wants maximum price certainty. Requires the least owner oversight of cost but the most attention to scope definition and change control. Weakness: every ambiguity becomes a potential change order or claim, and contractors price unknown risk into their bid through contingency.

2. Unit Price
The contractor is paid a fixed price per unit of work actually installed (per cubic yard of excavation, per linear foot of pipe, per ton of asphalt). Risk is divided: the contractor bears the risk of the unit cost (productivity and material pricing), while the Owner bears the risk of the quantity. Common in heavy civil, highway, utility, and earthwork projects where quantities cannot be known precisely in advance. Watch for unbalanced bids, where a bidder front-loads unit prices on early items or on items the bidder expects to overrun. Most unit price contracts include a variation in estimated quantities clause (often triggered at plus or minus 15 to 25 percent) that permits renegotiation of unit prices when actual quantities deviate significantly.

3. Guaranteed Maximum Price (GMP)
A hybrid: the contractor is reimbursed for actual allowable costs plus a fee, but the total is capped. Costs above the GMP are absorbed by the contractor; costs below the GMP produce savings that typically revert to the Owner or are shared according to a negotiated formula. GMPs are most often set when design is partially complete (frequently 60 to 90 percent), which is why they include a construction contingency controlled by the contractor (with Owner visibility and often approval), allowances for undefined items, and clear definitions of which costs are reimbursable. Risk is shared: the contractor assumes risk above the cap, the Owner retains design and scope risk and often benefits from savings. GMP is the signature contract type of CM at-Risk and many Design-Build arrangements. Requires open-book accounting and audit rights.

4. Cost-Plus (Cost-Reimbursable)
The Owner reimburses the contractor's actual allowable costs plus a fee for overhead and profit. The Owner carries nearly all cost risk. Variants are distinguished by how the fee is determined:
• Cost Plus Fixed Fee (CPFF) – fee is a set dollar amount, so the contractor has no incentive to inflate cost, but also limited incentive to economize.
• Cost Plus Percentage of Cost (CPPC) – fee grows as cost grows; this creates a perverse incentive and is prohibited on federally funded work and widely discouraged.
• Cost Plus Incentive Fee (CPIF) – fee adjusts by formula against a target cost, sharing savings and overruns between the parties.
• Cost Plus Award Fee (CPAF) – a base fee plus a subjective award fee based on Owner evaluation of performance (quality, safety, schedule).
Cost-plus is appropriate for emergency work, fast-track projects where construction starts before design is complete, highly uncertain or experimental scopes, and situations where the Owner wants to start immediately and control the design as it evolves. It demands intensive Owner and CM oversight: audit rights, definitions of allowable versus non-allowable costs, approval of self-performed work rates, and rigorous documentation.

5. Time and Materials (T&M)
The contractor is paid agreed hourly labor rates (which include overhead and profit) plus materials at cost plus markup. Often used for small, undefined, or emergency scopes and for pricing change order work when a lump sum cannot be agreed. Almost all risk sits with the Owner, so T&M should typically carry a not-to-exceed ceiling and daily signed tickets verified by the CM.

Core Principle of Risk Allocation
The guiding rule you will see tested repeatedly: Risk should be assigned to the party best able to control, manage, mitigate, or insure it, and that party should be compensated for carrying it. Shifting a risk to a party that cannot control it does not eliminate the risk; it simply inflates the price (contractors add contingency) and increases the probability of disputes. Examples of risks commonly allocated by clause rather than by contract type include:
• Differing Site Conditions – usually retained by the Owner, because the Owner controls the site investigation and the contractor cannot reasonably verify subsurface conditions during a bid period.
• Material Price Escalation – may be shared through escalation clauses tied to an index when market volatility is high.
• Weather – normally the contractor bears usual weather; abnormal weather is often excusable but non-compensable (time but no money).
• Force Majeure – events beyond either party's control, typically excusable delay without compensation.
• Design Errors and Omissions – Owner (and ultimately the Designer) in traditional delivery; the Design-Builder in Design-Build.
• Schedule – enforced through liquidated damages (a pre-agreed estimate of Owner's daily loss, not a penalty) and sometimes incentivized through early completion bonuses.

How the CM Selects and Administers the Contract Type
The CM analyzes several factors when recommending a contract type to the Owner:
1. Design completeness – complete design favors lump sum; incomplete design favors GMP or cost-plus.
2. Schedule urgency – fast-track and overlapping design and construction favor cost-reimbursable or GMP structures.
3. Owner's need for price certainty – public owners with fixed appropriations often require lump sum or GMP.
4. Owner's capacity and willingness to oversee cost – cost-plus demands staffing and audit capability.
5. Scope definability and quantity certainty – indefinite quantities favor unit price.
6. Market conditions – in a hot market with few bidders, rigid lump sum risk transfer produces inflated bids or no bids.
7. Complexity and uniqueness – unusual or innovative work is poorly suited to fixed price.
8. Statutory requirements – public procurement law may mandate competitive sealed bidding and lump sum or unit price awards.

Once the contract is executed, the CM's contract administration duties track the contract type. Under lump sum, the CM focuses on scope interpretation, schedule of values review, and disciplined change order negotiation. Under unit price, the CM measures and certifies quantities in the field. Under GMP and cost-plus, the CM verifies that billed costs are actual, allowable, and supported; monitors contingency and allowance usage; reconciles buyout savings; and performs or coordinates audits. Under T&M, the CM validates daily tickets against observed crews and equipment.

Incentives and Shared Savings
Many modern contracts add mechanisms that align the contractor's interest with the Owner's: shared savings below the GMP (for example 75/25 or 50/50 splits), early completion bonuses paired with liquidated damages, performance-based award fees, and target cost arrangements with painshare and gainshare bands (typical of IPD and alliance contracting). On the exam, recognize that these mechanisms are tools for balancing risk and reward, not for transferring all risk to one side.

How to Approach Exam Questions on This Topic
Most questions present a short scenario and ask for the most appropriate contract type, the party that bears a particular risk, or the correct CM action. Use this sequence:
1. Identify the design completeness stated or implied in the scenario.
2. Identify the Owner's primary objective: price certainty, speed, flexibility, or quality.
3. Identify who controls the uncertain variable (quantity, cost, duration, site condition).
4. Match to the contract type on the risk spectrum, then check that the answer also fits any stated procurement constraints (public bidding, federal funding, emergency).
5. Eliminate answers that violate the core principle of assigning risk to the party unable to control it.

Exam Tips: Answering Questions on Contract Types and Risk Sharing
• Memorize the spectrum. Lump Sum (contractor risk) → Unit Price (split by quantity vs. unit cost) → GMP (shared, capped) → Cost-Plus (owner risk) → T&M (owner risk, ceiling recommended). Many questions are simply asking you to place a scenario on this line.
• Incomplete design is the biggest clue. If the scenario says drawings are at 50 to 70 percent or construction must start before design is finished, lump sum is almost never the correct answer; look for GMP or cost-reimbursable.
• Uncertain quantities point to unit price. Earthwork, rock excavation, dewatering, paving, and utility work with unknown lengths or volumes signal unit price. Remember the Owner carries quantity risk and the CM must verify quantities.
• Cost Plus Percentage of Cost is a distractor. If an answer choice involves CPPC on public or federally funded work, it is almost certainly wrong because it rewards higher spending and is prohibited.
• Liquidated damages are not penalties. They must be a reasonable pre-estimate of Owner damages; a question describing a punitive amount with no relation to actual loss is testing whether you know the clause may be unenforceable.
• Differing site conditions belong to the Owner. Unless the scenario clearly states a different allocation, the Owner retains subsurface risk because the Owner controlled the investigation.
• Separate delivery method from contract type. If a question asks about CM at-Risk, Design-Build, or Design-Bid-Build, it is about relationships and sequencing; if it asks about lump sum, GMP, or cost-plus, it is about payment and cost risk. Do not let one vocabulary set answer a question about the other.
• GMP questions often test contingency and savings. Know that the contractor's contingency inside the GMP covers contractor risks (buyout gaps, coordination issues), not Owner-directed scope changes, which are handled by change order against the Owner's contingency. Unused GMP savings revert to the Owner unless a sharing formula is specified.
• Open-book, audit rights, and allowable cost definitions are CM duties under any cost-reimbursable or GMP contract. If a question asks what the CM must verify before approving a pay application on a cost-plus job, the answer involves documentation of actual costs, not just percent complete.
• Look for the word 'best' or 'most appropriate.' Several answers may be technically possible; choose the one that matches the Owner's stated priority while allocating risk to the controlling party.
• Emergency or urgent scenarios favor T&M or cost-plus with a not-to-exceed limit, and the CM's recommended action usually includes converting to a defined price once scope stabilizes.
• When the Owner wants maximum price certainty and the design is complete, lump sum wins, but be ready for a follow-up asking about the trade-off: higher claim exposure from ambiguities and reduced flexibility to change scope.
• Risk transfer is not free. Any answer implying that shifting all risk to the contractor lowers project cost is wrong; contractors price risk into bids, so unreasonable transfer increases cost and disputes.
• Read for the CM's professional role. The CM advises, recommends, verifies, and documents on behalf of the Owner. Answers in which the CM unilaterally assumes contractor risk, waives Owner rights, or makes decisions reserved for the Owner are typically incorrect.

Quick Reference Summary
• Lump Sum: complete design, price certainty, contractor bears cost risk, Owner bears design and changes.
• Unit Price: indefinite quantities, Owner bears quantity risk, contractor bears unit cost risk, CM measures quantities, watch for unbalanced bids.
• GMP: partial design, shared risk, cap protects Owner, savings revert or are shared, requires open-book and contingency management.
• Cost-Plus (Fixed, Incentive, Award Fee): urgency or uncertainty, Owner bears cost risk, heavy CM oversight and audit; avoid Percentage of Cost.
• T&M: small or emergency scope, Owner bears risk, set a not-to-exceed, verify daily tickets.
• Governing principle: allocate each risk to the party best positioned to control it and compensate that party accordingly.

Master this framework and you will be able to answer not only direct definition questions but also the scenario-based judgment questions that make up most of the CCM exam's Contract Administration content.