GMP Numbers Owners Can Trust: Deal Structures That Make “Guaranteed” Feel Like It
A guaranteed maximum price can be a useful tool, but sophisticated owners and developers know the hard truth: a GMP is only as trustworthy as the contract structure underneath it. In a true GMP arrangement, the contractor generally bears costs above the cap unless the price is changed through a valid change order or another contract mechanism shifts that risk back to the owner. That sounds simple, but on multi-family, commercial, energy, and industrial projects, the real fight is usually over contingencies, allowances, escalation, scope definition, and what counts as an owner-driven change.
That is why owners should stop asking whether a project is “GMP” and start asking what kind of GMP deal they are actually being offered. The better question is whether the structure makes that guarantee number dependable when design evolves, procurement tightens, and schedule pressure starts driving field decisions.
What Owners and Developers Frequently Get Wrong About GMPs
Many owners and developers treat the GMP as if the cover-page number itself creates certainty. It does not. A GMP can still leave the owner exposed if the contract includes loose allowance language, broad escalation relief, weak drawing assumptions, or contingencies the contractor controls without meaningful transparency.
In other words, a bad GMP is still a bad deal. If the pricing assumptions are soft enough, the contractor may not exceed the formal cap very often because the contract already gives it multiple pathways to move the cap upward. That is especially true on projects that start before design is fully mature. The earlier the GMP is set, the more important it becomes to define exactly what is included, what assumptions are locked, what contingencies exist, and who controls the release of each dollar.
GMP structures owners can trust more
From an owner’s perspective, the best kinds of GMPs do not rely on a single promise. They combine pricing discipline, transparency, and incentive alignment. Three structures usually often more trustworthy results than the generic “cost plus fee with a cap” form:
1. The transparent contingency GMP
In this structure, the contractor’s contingency is disclosed, itemized, and subject to defined use rules. The owner doesn’t just know that a contingency exists; the owner knows its amount, what it may be used for, what cannot be charged against it, and when unused amounts return to the owner.
A transparent contingency GMP works best when the contract also requires periodic contingency reporting. That reporting should show beginning balance, approved uses, denied uses, pending exposures, and remaining balance tied to specific risk events rather than vague “project support” descriptions. This turns contingency from a hidden profit buffer into a managed risk tool.
Owners should also distinguish between contractor contingency and owner contingency. Contractor contingency should address estimating gaps and ordinary execution risk that the contractor agreed to own, while owner contingency should be reserved for owner-driven scope changes or specifically identified unknowns. If those buckets are blurred, the GMP stops feeling guaranteed very quickly.
Negotiation Priorities:
Define contingency line items and prohibited uses.
Require monthly contingency logs and back-up support.
State that unused contractor contingency returns to the owner.
Bar contingency use for errors, coordination failures, or trade buyout misses that fall within contractor risk
2. The shared-savings GMP
A shared-savings GMP gives the contractor a reason to beat the budget without quietly protecting excess internal cushions. Instead of letting the contractor keep soft contingencies or bury savings in buyout strategy, the contract provides that verified underruns below the GMP are shared between owner and contractor using a negotiated formula.
This structure can be powerful because behavior follows incentives. If the contractor knows it can earn additional upside through documented savings, it has less reason to overprotect itself through inflated assumptions at the front end. The owner, meanwhile, gets visibility into whether the GMP was disciplined from the start and shares in the upside if procurement or execution outperforms expectations.
One potential risk is that “savings” can become an accounting debate. Owners should therefore define the calculation method, the treatment of contingency burn, the timing of reconciliation, and whether savings are measured before or after fee, self-performed work adjustments, and unresolved claim reserves.
Negotiation Priorities:
Define “cost savings” precisely.
Exclude unresolved claims and disputed change amounts from savings calculations.
Require open-book cost reporting through closeout.
Reconcile savings only after procurement is substantially complete and major exposure items are quantified.
3. The indexed-escalation GMP with hard guardrails
Owners increasingly have to deal with tariff, supply-chain, and commodity volatility. A flat “contractor bears all escalation” position may sound attractive, but on some projects it simply leads to padded numbers, strategic exclusions, or procurement gamesmanship.
For the right project, a better structure may be a GMP with a narrow, objective escalation mechanism. Instead of broad relief for “market conditions,” the contract ties escalation to defined categories, a stated baseline date, objective indices, notice requirements, mitigation duties, and often a cap or sharing threshold. This approach can make the GMP number more honest. Owners often get a more credible base price when the contractor is not forced to guess at worst-case market movement across every major package.
One danger is sloppy drafting. If escalation relief is not tied to objective triggers and procurement timing discipline, the clause can become an open-ended escape hatch. The owner should insist on proof of baseline pricing, prompt notice, substitution efforts, acceleration of buyout where appropriate, and a clear rule for when the contractor still owns the miss.
Negotiation Priorities:
Limit escalation to specific materials or scopes.
Use objective indices or documented supplier pricing.
Set a baseline date and notice deadline.
Require mitigation and substitute analysis.
Cap relief or apply a shared-risk band before owner participation begins
Questions Owners Should Consider Asking Before Signing Any GMP
Before accepting a GMP, owners should consider asking:
What design assumptions are embedded in the price today?
What contingencies exist, who controls them, and what uses are prohibited?
Which allowances are still placeholders rather than real market-tested numbers?
What exactly counts as an owner change versus a contractor miss?
How are buyout savings, escalation events, and unresolved claims treated?
What reporting will the owner receive during preconstruction and construction?
What happens if trade pricing or procurement timing moves against the estimate?
If the contractor cannot answer those questions clearly, the GMP is probably not as reliable as the cover page suggests. On a high-value project, experienced project counsel can be worth their weight in gold.
Why this Matters Before Negotiations Start
Once the owner has selected the team, committed to the delivery method, and let preconstruction work proceed without disciplined deal architecture, it becomes much harder to tighten assumptions, narrow contingencies, or demand transparent reporting. It is a lot easier to ask for and negotiate protections during contract negotiations. Any new requirements introduced after the GMP contract is signed might actually subject the Owner to change order claims!
That is why sophisticated owners, developers, and contractors often benefit from dedicated project counsel like Elkhoury Law before the major paper is signed. Project counsel does more than just redlining boilerplate. We can help you build a pricing structure (and matching contract terms) that matches the project’s actual risk profile and reduces the chance that every later budget event turns into costly litigation.
Planning a multi-family, commercial, industrial, or energy project under a CMAR or GMP model? The contract structure behind the number matters as much as (if not more than) the number itself. Elkhoury Law advises owners, developers, and contractors on GMP strategy, risk allocation, and project counsel support before negotiations harden into disputes. Contact us today!
