Why Construction Administration Is Different From Every Other Phase

Every other phase in the A/E project has a recognizable structure. The scope can be estimated. The deliverables are defined. The work is largely self-directed — the team produces what was scoped, and the phase ends.

Construction administration works differently.

CA is a reactive phase. The A/E firm responds to the project rather than driving it. The contractor submits RFIs. The firm responds. The contractor submits shop drawings. The firm reviews them. The owner requests changes. The firm evaluates them. Field conditions diverge from the documents. The firm resolves them.

None of those demands arrive on a schedule the firm controls. All of them consume the CA fee that was set at proposal time — before anyone knew how many RFIs the contractor would submit, how many submittals would require multiple review cycles, or whether the construction schedule would run six months past its target completion date.

This is not a problem with how firms scope CA. It is a structural feature of how construction administration works. The phase that protects the design through construction is inherently unpredictable in its demands — which is exactly why the billing structures, tracking systems, and additional services practices used during CA matter more than in any other phase.

The Billing Structures That Work for CA — and the Ones That Don't

The fee structure chosen for construction administration determines how well the firm can recover the work it actually performs. The wrong structure exposes the firm to unlimited scope without a billing mechanism to recover it. The right structure creates a connection between work performed and revenue earned.

Fixed Fee CA — the most common and most dangerous structure

Fixed fee construction administration sets a defined amount for the full CA scope. The fee is simple to present and easy for clients to budget. It is also the structure most likely to leave the firm absorbing significant additional work without compensation.

When CA scope is fixed, every additional RFI, every resubmittal, every change order evaluation, and every additional site visit beyond what was scoped comes out of the firm's margin. The exposure is not theoretical — on most projects of meaningful complexity, CA scope exceeds the original estimate. A fixed fee with no additional services mechanism converts that scope expansion directly into absorbed cost.

Fixed fee CA can work when the scope is tightly defined, the contract type reduces change order exposure, and the construction schedule is reliable. In practice, those conditions rarely coexist. Fixed fee CA should be used selectively and only with a well-defined additional services clause that establishes clear triggers for billing beyond the base scope.

Hourly CA — the most protected structure

Hourly CA bills the firm's time at agreed rates for all CA services delivered. The firm is protected from scope expansion because every additional demand on the team is a billable hour. The client carries the cost uncertainty.

Hourly CA is the appropriate structure for projects with high change order exposure, uncertain construction schedules, unfamiliar delivery methods, or contractors with poor documentation discipline. It is the honest pricing of a service that is genuinely difficult to scope accurately.

The resistance to hourly CA is almost always from clients who want cost certainty. That resistance is worth a direct conversation: the difficulty of scoping CA accurately is not the firm's failure to estimate competently — it is a structural feature of how construction works. Clients who accept hourly CA for genuinely undefined phases make better-informed project decisions than clients who push for fixed fees that underprice the risk.

NTE CA — the hybrid with management requirements

Not-to-exceed CA gives clients cost certainty up to a defined cap while giving the firm protection against open-ended work. The cap should be set from a realistic CA hours estimate — not from a percentage of the design fee or a round number that seemed appropriate. When the NTE is set correctly and tracked actively, it can be a workable middle ground.

When it is set as a number the client prefers and not tracked against actual hours, it functions as a fixed fee with extra administrative steps. The firm reaches the cap partway through construction, delivers the rest of CA at no compensation, and discovers at closeout that the NTE was not protective because nobody was monitoring it.

→ Read: How to Bill Construction Administration Services Correctly

RFIs, Submittals, and the Scope That Accumulates Without Being Named

The most consistent source of CA fee erosion in A/E firms is not a single large scope change. It is the accumulation of small, individually manageable demands that collectively consume the fee before anyone has identified them as a problem.

RFI volume

Every RFI requires time. A simple clarification might take 30 minutes to research, coordinate, and respond to. A complex one involving structural design, code interpretation, or a design change requiring consultant input can take half a day or more.

A project that generates 200 RFIs over a 16-month construction schedule has produced 200 discrete service events against a CA fee that was estimated for a different number. If the original CA scope assumed 80 RFIs and the project produces 200, the firm has delivered 120 additional RFI responses — each one real work, few of them billed as additional services.

The firms that track RFI volume actively — monitoring the running total against the original scope assumption throughout construction — can identify when the project has crossed into additional service territory. The firms that don't discover it at project closeout when the CA fee is exhausted and the construction schedule still has months remaining.

Submittal volume and resubmittals

Submittal scope is driven by the contractor's procurement process and fabricator relationships — not by the A/E firm's scope estimate. A mechanical contractor using fabricators unfamiliar with the specified system will generate more submittals and more resubmittals than one with established vendor relationships. A structural steel fabricator who submits incomplete packages requiring multiple review cycles creates more engineering time than one who submits complete, coordinated packages the first time.

The scope assumption embedded in the CA fee is a best estimate of typical submittal volume for that project type. When the actual submittal log exceeds it — as it routinely does — the additional review time is additional scope. Tracking submittal volume against the original assumption is what makes that additional scope visible before the fee is gone.

Change order evaluation

Every change order requires the A/E firm to evaluate the proposed change — assess its impact on the design, coordinate with affected disciplines, determine whether it creates code compliance issues, and issue revised documents if required. That evaluation is engineering work. It is billable as an additional service in most standard contracts.

It is also consistently unrecovered. The change order conversation happens under time pressure, with the contractor waiting for a response and the owner watching the schedule. The engineering evaluation happens. The additional service billing often does not — because the moment passed, the project moved on, and the change order was small enough that it seemed not worth the friction of billing.

Ten small change order evaluations at $300 to $800 each are $3,000 to $8,000 in unbilled work. Twenty evaluations are $6,000 to $16,000. On a complex project, the cumulative value of unrecovered change order evaluation is often the difference between a profitable CA phase and a losing one.

→ Read: How RFI and Submittal Volume Erodes A/E Fees — and How to Track It

Additional Services During CA — the Revenue Most Firms Leave Behind

Additional services during construction administration are the most consistently underutilized revenue source in A/E practice. The services are delivered. The basis for billing them exists. The conversations don't happen — or happen too late to be effective.

What typically qualifies as additional CA services

Most standard owner-architect agreements include language identifying specific conditions that constitute additional services beyond the base CA scope. The most common include:

Evaluating contractor substitution requests for products or materials not equivalent to what was specified. This requires engineering evaluation even when the answer is straightforward.

Preparing change order documentation — revised drawings, specifications, or calculations required to implement owner-directed changes to the construction.

Extended construction administration services when the construction period exceeds the schedule assumed in the contract. This is one of the most valuable and most consistently unclaimed additional service categories.

Additional site observations beyond the number included in the base CA scope — including observations triggered by contractor-requested inspections, special inspections, or conditions requiring engineering verification.

Evaluating and responding to contractor claims, including requests for additional time or compensation related to unforeseen conditions or design interpretation disputes.

Why they don't get billed

The additional service is identified. The project manager recognizes it as outside scope. The billing conversation does not happen.

The reasons are consistent: the project is mid-construction and the relationship is sensitive. The additional service seems small relative to the overall project. The right moment to raise it passed while the team was focused on the work. The language in the contract about additional services requires written authorization before proceeding — which didn't happen, making the after-the-fact conversation harder.

The structural fix is a standing authorization process established at project kickoff: when identified additional service work is below a defined threshold, the project manager notifies the owner in writing and proceeds unless the owner objects within a defined period. This keeps the project moving while creating the documentation that supports billing.

The closeout problem

Additional CA services that were not captured and billed during the project are significantly harder to recover at closeout. The owner is focused on certificate of occupancy, punch list, and retainage release — not on reviewing additional service invoices for work that happened six months ago. The relationship leverage the firm had during construction is reduced. The documentation of what constituted additional services is vaguer than it would have been at the time.

The right time to bill additional CA services is when they are performed — or within the current billing cycle. Not at closeout.

→ Read: Construction Administration Management: How to Control Scope and Protect the Fee

Extended Construction Administration — When the Schedule Runs Long

Construction schedules slip. It is not an exceptional condition — it is a routine feature of how construction works. Contractor performance, material supply chain, permitting delays, weather, owner-directed changes, and unforeseen conditions all contribute to schedule extension.

When the schedule extends, CA scope extends automatically. The A/E firm continues to respond to RFIs, review submittals, conduct site observations, and manage the contractor relationship for every additional month of construction. None of that additional work was in the original CA fee.

The billing mechanism most firms don't use

Most standard contracts include provisions for extended CA services — either as an explicit additional service category or through general additional services language that covers work beyond the original scope. The mechanism to bill extended CA is almost always in the contract. The conversation to invoke it is almost never initiated at the right time.

The right time is when the schedule extension becomes known — not when the original CA fee is exhausted. A project manager who identifies in month eight of a twelve-month schedule that construction has fallen six weeks behind can initiate the extended CA conversation with three to four months of the original schedule remaining. The client is still engaged. The project is still active. The additional service basis is clear.

A project manager who initiates the extended CA conversation in month seventeen of a project scheduled for twelve months is having a much harder conversation — about work that was delivered over the last five months without a billing agreement in place.

→ Read: Extended Construction Administration: How to Recognize It and What to Do About It

Retainage and CA Cash Flow

Construction administration creates a specific cash flow challenge that no other phase produces: the retainage gap.

Many owner contracts withhold a percentage — typically 5% to 10% — from each billing until substantial completion or final completion. For a CA phase billed over fourteen months, the retainage accumulated across those billings can represent a significant deferred payment.

When construction extends past the scheduled completion date, retainage stays outstanding longer. The firm is performing additional CA work during the extension — work that may or may not be compensated as additional services — while waiting for the retainage from the original CA phase that the owner has not yet released. Cash pressure from the CA phase compounds exactly when the firm's workload on the project is highest.

The management response has two components. First, negotiate retainage provisions in the CA contract before the project starts — a lower retainage percentage or a retainage release tied to milestones rather than final completion reduces the deferred payment exposure. Second, monitor the retainage balance actively alongside the CA fee balance throughout construction so the principal understands the firm's true cash position on the project at all times.

How BaseBuilders Supports CA Management

Construction administration management requires the same data discipline as every other phase in the project — but with a specific need for real-time tracking of the activity types that drive CA scope: RFIs, submittals, site visits, change orders, and additional services.

BaseBuilders connects CA activity tracking to the project financial picture — so the project manager can see at any point in construction how many RFIs have been responded to, how that volume compares to the original scope assumption, what the remaining CA fee balance is, and which additional services have been identified, authorized, and billed.

That visibility is what converts CA management from a closeout accounting exercise into a real-time financial management practice — one that catches scope expansion early enough to act on it and keeps additional service revenue from disappearing into delivered work.

→ See: BaseBuilders vs Monograph

→ See: BaseBuilders vs BQE Core

Construction Administration Deep Dives

These articles break down each component of CA billing and scope management — with practical guidance for applying them across the full construction phase.

Construction Administration Management: How to Control Scope and Protect the Fee

The complete CA management framework — tracking RFIs, submittals, site observations, and change orders in a way that keeps scope visible and additional services billable.

How RFI and Submittal Volume Erodes A/E Fees — and How to Track It

Why CA fees get consumed faster than any other phase and what tracking systems change the outcome.

How to Bill Construction Administration Services Correctly

The billing structures that work for CA and how to capture additional services before the work is delivered and the conversation is over.

Extended Construction Administration: How to Recognize It and What to Do About It

When construction schedules run long, CA scope expands automatically. Here's how to recognize it early and convert it from absorbed cost to billed revenue.

How Construction Administration Connects to the Rest of the Firm

CA billing does not stand alone. It connects to every financial system the firm operates.

Proposals and fees — the CA fee is set at the time of proposal. How it is structured, what the scope language defines as included and excluded, and what the additional services triggers are all determined before the project starts. The CA billing outcome is largely determined at proposal time.

Project management — the phase structure established during design determines how CA progress is tracked and billed. Projects set up with clear phase budgets and milestone definitions are easier to manage through CA than projects where the design phases were managed informally.

Cash flow and AR — CA creates specific cash flow challenges through retainage, extended schedules, and the uneven payment pattern of a phase billed over many months. The billing practices during CA directly affect the firm's cash position throughout construction.

Financial metrics — realization rate during CA is typically lower than during design phases — because additional services get absorbed, RFI volume exceeds estimates, and the phase that should close cleanly often extends with uncompensated work. Tracking CA realization rate separately from the design phase realization surfaces the pattern and drives better CA pricing on future similar projects.