Different responsibilities can create tension, but the right teams can turn that tension into clearer costs, better decisions, and fewer surprises during construction.
An owner who already has a Construction Manager at Risk, commonly known as a CMAR, may reasonably ask why the project also needs an independent cost estimator. After all, the CMAR is already preparing estimates. Wouldn’t another estimator simply duplicate the work? Not necessarily.
A CMAR and an independent cost estimator may review the same project, but they do not approach it from the same position. They have different responsibilities, different business considerations, and different questions to answer. Those distinctions affect what each team sees, how each team evaluates risk, and why their estimates may not initially match.
The CMAR is preparing to deliver the project. Its team must consider what it will take to procure, coordinate, manage, and construct the work while carrying the risks assigned under its agreement.
The independent cost estimator is not responsible for building the project. Its role is to provide a separate view of what the design-supported scope appears to cost based on quantities, assumptions, market information, and the conditions known at that stage of design.
Neither role makes the other unnecessary. In fact, an owner may gain more useful cost information when both perspectives are present—provided the CMAR and independent estimator are willing to work transparently, explain their reasoning, and respect what the other brings to the project.
When that happens, the owner receives more than two estimates. The owner receives a disciplined cost reconciliation process that can reveal why the numbers differ and what the project team should address before construction begins.
The CMAR’s Role: Planning for Construction Delivery
A CMAR evaluates cost through the lens of construction delivery.
Its estimate must account for more than what appears in the drawings. The CMAR must consider how the project will be purchased, sequenced, staffed, coordinated, and built. That perspective may include subcontractor and supplier participation, construction logistics, procurement lead times, temporary facilities, schedule requirements, general conditions, overhead, profit, and the risks the CMAR expects to carry.
Those risks have a real cost.
A CMAR may need to protect against labor shortages, limited trade availability, material escalation, schedule compression, uncertain site conditions, incomplete design information, or coordination problems that could affect construction. Depending on the project and contract, it may also be preparing to provide a guaranteed maximum price or otherwise assume responsibility for delivering the work within defined commercial terms.
The CMAR’s relationships with subcontractors and suppliers also influence its perspective. Those relationships can provide valuable project-specific information about trade capacity, current pricing, material availability, and the practical realities of executing the work. Building and maintaining those relationships is part of responsible construction management.
Therefore, the CMAR is not simply asking, “What does this design cost?”
It is asking:
What will it take for our team to build and deliver this project while managing the risks and responsibilities we will assume?
That is a legitimate and necessary question.
The Independent Estimator’s Role: Testing Scope, Assumptions, and Cost
An independent cost estimator evaluates the project without carrying responsibility for construction delivery.
Instead of determining what its own company must charge to build the work, the independent estimator develops a separate opinion of cost based on the documents, quantities, systems, assumptions, market conditions, and project requirements available at the time.
That review may include independently developed quantities, labor and material pricing, equipment costs, escalation, allowances, contingency, cost allocation by discipline, and assumptions for scope that has not yet been fully designed.
The independent estimator also looks for conditions that may not be obvious from a surface-level reading of the drawings. Access, security, logistics, phasing, material movement, code requirements, site restrictions, and coordination between disciplines may all affect cost. As the design develops, the estimator documents those assumptions and replaces them with more specific information when it becomes available.
Because the independent estimator does not have a construction contract to win, a subcontractor network to maintain, or delivery risk to price for its own organization, it can provide the owner with a separate reference point.
The independent estimator is asking:
What does the design-supported scope reasonably indicate this project should cost under the current assumptions and market conditions?
That question is also necessary.
The value is not that one perspective is more legitimate than the other. The value comes from understanding why they are different.
Why These Two Cost Perspectives Are Not Always Brought Together
Not every owner hires both a CMAR and an independent cost estimator. Even when both are engaged, their work may proceed separately until a significant variance forces the teams to compare their numbers.
One reason is the perception of duplication. If the CMAR already has preconstruction and estimating capabilities, an owner may question the cost of commissioning another estimate.
However, two estimates are only duplicative when they are prepared from the same perspective for the same purpose. A CMAR estimate and an independent estimate do not serve exactly the same function because the organizations preparing them do not carry the same responsibilities.
The relationship can also become difficult when either party views the other estimate as a challenge to its competence.
A CMAR may feel that the independent estimator does not fully appreciate construction logistics, trade conditions, schedule pressures, or the financial risk associated with delivering the project. Conversely, the independent estimator may question whether certain contingencies, quantities, markups, or risk allocations are fully supported by the design and market information.
The resulting tension is often structural rather than personal. The CMAR must protect the project’s delivery and its own business exposure. The independent estimator must remain objective enough to question assumptions and report what the evidence supports.
CCM’s project interviews describe this distinction directly: the CMAR is focused on mitigating the risks it will carry and protecting its ability to deliver the work, while the independent estimator is developing a separate market-based view of the project. Those perspectives can produce different assumptions about labor, materials, quantities, and cost allocation.
If the owner frames the comparison as “Which team is right?” the process can quickly become adversarial. Each party begins defending its total rather than explaining the basis behind it.
A more productive question is:
What does each team know, what has each team assumed, and what does the owner need to understand before making the next decision?
When Different Estimates Reveal Different Assumptions
An estimate variance is not automatically a problem. An unexplained variance is.
When the CMAR and independent cost estimator compare their assumptions, the reasons behind the different totals begin to surface. One team may use different labor or material pricing, calculate a larger structural quantity, include broader electrical scope, or interpret an incomplete part of the design differently. In some cases, one estimate may carry more of a particular cost than the available information supports, while the other may not carry enough.
Although two different totals can concern an owner at first, a transparent review turns that variance into useful information. By explaining how each number was developed, both teams can identify scope gaps, test their assumptions, and help the owner establish a more informed and supportable cost position for the project.
The Real Value of Bringing Both Teams to the Table
Collaboration begins when both teams recognize that they are contributing different information to the same owner decision.
The CMAR can explain the delivery conditions behind its estimate, including subcontractor participation, procurement constraints, schedule impacts, logistics, and the risks embedded in its pricing.
The independent estimator can explain the quantities, market inputs, allowances, assumptions, and design interpretations supporting its estimate.
Together, the teams can determine whether a difference comes from scope, quantity, unit price, productivity, risk, escalation, markup, or cost allocation.
This process can benefit the CMAR as well as the owner. An independent estimate may identify alternate materials, systems, or methods that the construction team has not considered. It may also help validate the CMAR’s position when the owner’s budget expectations no longer reflect current labor and material conditions.
At the same time, the CMAR may bring project-specific trade intelligence, supplier information, and delivery knowledge that improves the independent estimator’s understanding of the market.
When the contractor and independent estimator reach the same conclusion about current market conditions, they can give the owner a stronger, more unified explanation of what the project is likely to require. When they identify different approaches or materials, the comparison creates another opportunity to improve the project.
That is the point at which two estimates become something more useful: a cost reconciliation.
Cost Reconciliation: Turning Two Estimates Into One Clearer Cost Picture
Cost estimate reconciliation is not the act of averaging two totals or negotiating until both teams agree to a number in the middle. It is the structured process of understanding why the estimates differ.
A productive reconciliation may compare the estimates by building, system, discipline, construction division, bid package, quantity, unit cost, allowance, contingency, or markup. The right structure depends on the project, but the objective remains the same: isolate each material difference and determine what is driving it.
For example, if the mechanical estimates differ, the team should identify whether the disagreement comes from equipment selection, system capacity, quantity, labor productivity, controls, testing requirements, or procurement risk.
If site-work costs vary, the teams may need to compare earthwork quantities, access assumptions, utility scope, temporary conditions, stormwater requirements, or local hauling conditions.
A difference in the total electrical cost may result from different equipment assumptions rather than a disagreement about pricing. In one recent project CCM is working on, the contractor and independent estimator carried different assumptions for an emergency-power system while the design information was still limited. Comparing those assumptions helped the project team understand the budget implications and make a more informed system decision.
Reconciliation turns assumptions that were previously hidden inside separate spreadsheets into visible project decisions.
A Case Study on Collaborative Reconciliation
CCM is currently participating in a multi-building program where an independent estimator and CMAR are both involved during design.
CCM joined the project during the conceptual phase. The CMAR prepared its estimate, while CCM independently developed another. As the project advanced, the teams met to reconcile the differences before proceeding further into design.
The reconciliation was not a short exchange of totals. Representatives from the owner, design team, contractor, and estimating teams gathered for a meeting. The project plans and estimates were displayed, and the group reviewed the work line by line and system by system.
The teams discussed where the estimates aligned, where they differed, and what was causing each variance. Following the discussion, the design team distributed notes, the independent estimator adjusted its estimate where appropriate, and the contractor did the same. Both parties then resubmitted their work so the project team could review where the revised numbers landed.
That process did not require either team to abandon its professional judgment. Instead, it gave both teams an opportunity to explain their logic, consider new information, and make changes when the evidence supported them.
The project remains ongoing, so the final construction cost has not yet been determined. However, the reconciliation is already helping the owner establish a clearer view of the project during design rather than waiting until construction to discover what one estimate may have missed.
What a Successful Reconciliation Gives the Owner
The most valuable outcome is not that both estimates become identical. Instead, the owner receives a stronger understanding of what the project is expected to cost and why.
A successful reconciliation can clarify which scope items are included, which assumptions remain unresolved, where the CMAR is carrying delivery risk, and which design decisions have the greatest budget impact. It can also reveal whether an apparent variance comes from a true cost difference or simply from the way each team organized the estimate.
That knowledge helps the owner decide whether to clarify the documents, confirm a system, revise an allowance, accept a known risk, investigate market pricing, or adjust the budget. Most importantly, the process moves those conversations into the design phase.
The contractor will ultimately be responsible for presenting the cost to deliver the work under the agreed construction arrangement. By that point, however, major design decisions may be harder and more expensive to change.
The independent estimator and CMAR cannot guarantee that construction will contain no surprises. Nevertheless, by discussing their differences early, they can help the owner move closer to a supportable cost position before work begins and reduce the likelihood that important scope or assumptions will first surface after construction is underway.
Why the Right CMAR and Independent Estimator Matter
Simply placing a CMAR and an independent cost estimator on the same organization chart does not guarantee a productive outcome. The owner must choose teams capable of collaboration.
A strong independent cost estimator should be willing to defend its estimate without becoming defensive. It should document its assumptions, explain its methodology, listen to project-specific information from the CMAR, and revise its position when better evidence becomes available.
Independence should not mean inflexibility.
Likewise, a collaborative CMAR should be willing to explain its delivery assumptions, trade input, risk allowances, and markups at the level required for a useful comparison. It should recognize that the independent estimator is not there to undermine the construction team, but to provide the owner with another informed perspective.
Transparency should not be mistaken for surrendering legitimate business information or accepting every challenge. It means giving the project team enough information to understand the basis behind material cost differences.
Respect is equally important. When either party enters the process determined to prove the other wrong, reconciliation becomes a contest. When both enter prepared to explain, question, and learn, the variance becomes useful information.
When the project has two willing participants who are respectful and open to discussion, two different ways of viewing cost can produce a much stronger result. The owner should therefore evaluate more than estimating credentials and technical experience. The selection process should also consider how each team communicates, responds to questions, documents assumptions, and handles professional disagreement.
How Owners Can Set the Stage for Productive Collaboration
Although the CMAR and independent estimator must bring the right mindset, the owner also shapes how effectively the teams work together. The owner should establish from the beginning that the two estimates are intended to provide complementary perspectives.
Both teams should know which documents and design milestones they are pricing, which project schedule applies, how escalation should be treated, and how allowances, contingency, overhead, profit, bonds, and insurance will be presented. A shared estimate structure can also make the comparison more efficient, although each team should retain enough independence to develop its own quantities and conclusions.
Reconciliation meetings should be scheduled as part of the design process rather than triggered only when the totals are far apart. That gives the teams time to address differences at conceptual, schematic, and later design milestones while the project can still respond.
The owner should also invite the design team into the conversation. Some differences cannot be resolved by estimators or contractors because they require clarification of design intent, system selection, performance criteria, or scope responsibility.
When the process is structured well, the owner does not sit helplessly between two competing totals. The owner gains a forum in which each team explains what it sees and what the project needs.
Why Both Cost Perspectives Belong on the Project
A CMAR and an independent cost estimator do not perform the same role.
The CMAR brings construction-delivery knowledge, trade relationships, procurement insight, logistics planning, and an understanding of the risks involved in building the project.
The independent estimator brings a separate review of design-supported scope, quantities, assumptions, market conditions, and cost allocation without responsibility for winning or performing the construction work.
Those perspectives may naturally create tension. However, tension does not have to become conflict.
When both parties are transparent, collaborative, and respectful, their differences can expose missing scope, test assumptions, improve cost allocation, and help the owner understand what the project is likely to require.
The resulting reconciliation is not simply a compromise between two numbers. It is a clearer explanation of the project.
For owners, that makes combining a capable CMAR with a collaborative independent cost estimator more than an added layer of review. It becomes a way to strengthen accountability, improve design-phase decisions, and establish greater cost clarity before construction begins.
Bring Greater Cost Clarity to Your CMAR Project
CCM works with owners, architects, engineers, and construction teams to develop independent estimates and support cost reconciliation throughout design.
When a project includes a CMAR estimate, CCM can provide a separate analysis of the scope, quantities, assumptions, and market conditions, then participate in a collaborative review of the differences.
Contact CCM to discuss how independent cost estimating can strengthen your project’s preconstruction and reconciliation process.