Why marine electrical estimates blow up (and whose fault it isn't)

A cable run that was supposed to be 40 feet turns out to be 95. The estimator priced it at 40, because that's what the drawing said. Nobody lied. Nobody padded a number. The drawing was simply wrong, and it had been wrong since a modernization availability three ownership cycles ago that never got reflected in the as-builts. The electrician who finds this out is standing in the space with a spool of cable that's now short, a schedule that assumed the original number, and a program office asking why the estimate "blew up."

It didn't blow up. It was never accurate to begin with. The estimator just found out last.

This is the pattern behind a large share of marine electrical cost growth, and it deserves a more precise name than "scope creep," because scope creep implies the scope changed. Usually it didn't. What changed is that someone finally looked behind a bulkhead panel that the drawing package assumed was still configured the way it was in 1998.

The estimate inherits every prior availability's paperwork, not its wiring

Every vessel comes into an availability with a drawing package, a maintenance history, and a configuration baseline. The estimator is required to price against that baseline because it's the only documented version of the ship that exists. But the baseline is a paper record of decisions made across multiple prior contractors, multiple prior owners, and, in Navy work, multiple prior modernization cycles that may or may not have been captured accurately in the ship's technical documentation.

This is the Inherited Baseline: the estimator is pricing the ship the paperwork describes, not the ship that exists. The gap between those two ships is not the estimator's error. It's the accumulated, uncorrected drift of every previous evolution that got a change order and a fix on deck but never got a corresponding update to the drawing set. Nobody budgets for the labor hours to true up documentation from a job three availabilities back, so it doesn't happen, and it compounds.

The $1.84 billion wasted modernizing four Ticonderoga-class cruisers before they were decommissioned is the extreme, program-level version of this failure.¹ At the individual estimate level, the same mechanism shows up smaller and more often: a distribution panel that was relocated during a prior repair but never re-drawn, a circuit that was re-fed from an adjacent panel as a field fix and never traced back into the wiring diagrams. The estimator has no way to know this exists until a technician opens the space.

The estimator is pricing against an inspection regime that may not have found the truth either

There's a second layer to the Inherited Baseline problem, and it's more troubling than paperwork lag: the inspections that are supposed to catch configuration drift have themselves been weakened. GAO-25-106749 found that in 2020, Navy leadership changed inspection procedures specifically to reduce the number of inspections by almost half, and did so explicitly to preserve working relationships with contractors.² That is not a claim about sloppy inspectors. It's a documented policy decision to inspect less.

An inspection regime exists to catch the moment when as-built diverges from as-designed, before that divergence gets buried under the next layer of insulation, cable lagging, or overhead. If the inspection count drops by roughly half, the opportunities to catch and correct baseline drift drop with it. The estimator working the next availability isn't just inheriting old drawings. They're inheriting a documentation trail with fewer checkpoints, which means more silent divergence accumulated between the last verified configuration and the one that actually exists in the hull today.

This is why "the estimate was wrong" is frequently the wrong diagnosis. The correct diagnosis is "the last three inspection cycles didn't have the coverage to catch what changed."

Fixed-price bidding turns an inherited baseline into a bet the estimator can't hedge

The Inherited Baseline problem existed under cost-plus contracting too, but it was absorbable. Under cost-plus, when a technician opened a space and found the drawing was wrong, the government paid for the delta, because the contract mechanism was built to pay for the work actually required. It was not efficient, but it did not put the estimator's number on trial.

The Navy's shift toward fixed-price, per-ship bidding to increase competition changes what an inherited baseline means financially.³ Under fixed-price, the estimator's number is the number. If the cable run is 95 feet instead of 40, that difference comes out of a margin that was calculated against the paper ship, not the real one. The contractor either eats the difference or fights for a change order, and change order negotiations take time, which erodes the schedule float that wasn't generous to begin with.

This is the mechanism connecting two forces that look unrelated on paper: a documentation and inspection problem inherited from prior availabilities, and a contracting structure that assumes the documentation is reliable enough to bid against with precision. Fixed-price bidding rewards accurate estimating. It cannot reward accurate estimating against an inaccurate baseline, because no amount of estimator skill corrects for information that does not exist yet.

Where the fault actually sits, and why that matters operationally

None of this excuses genuinely bad estimating. Estimators who don't walk the ship, who don't cross-check drawings against the most recent completed availability's closeout package, who don't build contingency into runs through spaces with a documented modification history: that's a skills and diligence problem, and it's real.

But a large share of the growth that gets labeled "estimating error" in ship repair is actually baseline error that predates the estimator's involvement by years, sometimes decades. The GAO finding that fewer than 40 percent of ships finish their maintenance availabilities on time, even when dock space is available, is consistent with cost and schedule growth driven by discovery work rather than execution failure.⁴ You don't miss deadlines because your electricians are slow. You miss deadlines because the fourth week of the availability is when someone finds the panel that isn't where the drawing says it is.

This matters because the fix is not "get better estimators." The fix is investing in configuration verification and documentation currency between availabilities, and in inspection coverage that actually catches drift when it happens rather than five ownership cycles later. Both of those investments look like overhead with no immediate return, which is exactly why they keep getting deferred, and exactly why the same failure mode recurs on the next hull.

The practical takeaway

For the port engineer scoping the next electrical availability: the single highest-leverage move available before the estimate is drafted is commissioning a physical verification pass on any distribution panel or cable run that has a modification history, not just a repair history. A modification that was fixed on deck and never re-drawn is the single most common source of the Inherited Baseline gap. If the verification budget is tight, prioritize spaces touched by any prior modernization availability over spaces that have only seen routine maintenance. Routine maintenance rarely changes configuration. Modernization always does, and modernization is precisely the work most likely to outrun its own paperwork.

References

1. Verified evidence anchor: $1.84 billion wasted modernizing four Ticonderoga-class cruisers decommissioned before deploying.
2. GAO-25-106749.
3. USNI coverage of Navy shift from cost-plus to fixed-price per-ship bidding to increase competition.
4. GAO finding on ship maintenance availability completion rates (fewer than 40 percent on time despite dock space availability).