The bid item is the whole price: how Caltrans and California public work actually pay

You bid an agency job the way you bid private work and the number looked healthy. Then the traffic control you assumed was a pay item turned out to be incidental to the item you already priced, the plan quantity you expected to be remeasured at the end was not remeasured, and three weeks of March rain that you were sure bought you time bought you four days.

None of that was bad luck. It was four sentences in a specification book that pays on rules a private contract does not use. Public work in California is not private work with more paperwork. It is a different pricing instrument, and the parts that catch people are printed in advance and do not move once the bid is advertised.

What follows is the spec family question you settle before pricing a line, what a bid item price is deemed to cover, final pay quantities against measured ones, how contract time is charged against the controlling activity, what actually earns a non-working day, and the money rules on security, bonds, retention and progress payments. Every figure names the section it comes from.

Settle the spec family before you price anything

California has no standard method of measurement. There is no national rulebook sitting behind your bid deciding what a line item includes. The contract is the measurement authority, and that means the same trade, on the same street, can be measured and paid four different ways depending on which book the agency adopted.

The practical move is boring and it is the whole job: before you price a section, read the measurement and payment paragraph at the end of that section. That paragraph, not your takeoff, decides what you are being paid for.

A bid item price is deemed full compensation

This is the sentence that eats margins. A bid item price is deemed full compensation for everything that item needs. Not for the material and the crew hour. For everything: the incidental traffic control, the dewatering, the testing coordination, the cleanup, the temporary work that makes the permanent work possible, unless the contract carries a separate pay item for it.

So the estimating question on public work is never "what does this cost me". It is "what does the book say is inside this item, and did I price all of it". A contractor who prices a bid item off a private-work unit rate is pricing about seventy percent of a scope and calling it a bid.

One habit fixes it: keep a running list of what the spec called incidental on the last three jobs, because agencies reuse their own language and the same costs keep landing inside the same lines.

Final pay quantities are not remeasured, and that cuts both ways

On Caltrans work, an item designated a final pay quantity is paid at the plan quantity. It is not remeasured at the end of the job. The plan says 1,900 cubic yards, you get paid for 1,900 cubic yards, whether the field came in at 1,840 or 2,050.

That is a real transfer of risk and it reads better as an advantage than a trap. Revenue on those items is fixed and knowable the day you bid, which is more certainty than a private contract will ever give you. What is not fixed is your production, and if your assumption about yards a day is wrong, that error is entirely yours, because the money stopped moving the moment the plan quantity was set.

Other items are measured, and the measurement rule is specific to the material. Bulk materials including asphalt are paid by certified weight, not by plan area, so the weigh tickets are the pay record and a missing ticket is a missing payment. Sort your bid sheet into final pay items and measured items before you price it, because the two carry completely different risk.

When quantities move more than a quarter

Quantities do move, and the contract has a threshold for it. A bid item quantity that moves more than 25 percent, in either direction, opens the door to a price adjustment on that item. An overrun beyond 125 percent of the plan quantity is what supports a time extension.

Take a measured asphalt item at a plan quantity of 5,000 tons. The field finishes at 6,700 tons, which is 134 percent of plan. You are past 125 percent, so the extra tonnage supports a request for time, and the movement is well past 25 percent, so the unit price on that item is open for adjustment rather than simply riding the original number.

The underrun is the one people forget. Finish the same item at 3,500 tons and that is 70 percent of plan, a 30 percent movement, also past the threshold, while your fixed cost was spread across 5,000 tons and did not shrink when the tonnage did. That adjustment belongs to you too, and it only happens if somebody tracks the running quantity against plan month by month instead of finding out at closeout.

Contract time is working days charged against the controlling activity

This is the second big difference and it is where weather arguments are won and lost. Caltrans contract time runs on working days, and a day is charged against the controlling activity: the activity that is actually driving the completion date right now.

That means weather relief does not depend on rainfall. It depends on whether the controlling activity could proceed. A day of rain on a job whose controlling activity is inside a box culvert is a charged working day. A dry day when the controlling activity is roadway excavation on a subgrade that has not drained is not.

Here is a real week, on a job whose controlling activity shifts midweek.

Four of those five days had weather in them. Two were charged and two were not, and the weather report never decided it. What decided it was which activity was controlling on the day. Friday is the one people do not expect: unhealthy air quality from wildfire smoke can produce a non-working day on its own, because the crew cannot work and the controlling activity therefore cannot proceed.

The mechanism that makes this work in your favor is a daily record that names the controlling activity. If your diary says "rain, no work" you are arguing from the weather. If it says "controlling activity roadway excavation, subgrade saturated, no production" you are arguing from the contract, and the contract is the thing the resident engineer is required to apply.

Mobilization, extra work and the rental rate book

Mobilization on public work is usually its own bid item, paid on a partial payment schedule rather than in a lump at the start, so do not price it as the money that funds your first two months.

Extra work is priced by agreement first. Force account is the fallback, not the default, and that order is worth defending, because an agreed price protects your markup while a force account day only protects your cost. When force account does apply on Caltrans work, equipment is priced from the current Caltrans rental rate book rather than your internal rate sheet. If your shop rate for an excavator is higher than the book, the book wins. Check it before you agree to run anything on force account, not after.

Bidder's security, the payment bond and the money clock

The financial side of a public bid has its own set of numbers, and none of them are negotiable.

Bidder's security on local agency work runs at not less than 10 percent of the amount bid under the Public Contract Code's local agency bidding provisions, which means your bid bond capacity, not your interest, decides the size of job you can chase.

A payment bond is required on public works over $25,000 under Civ. Code s.9550. That bond is the security your subs and suppliers reach, and a claimant's suit on a public works payment bond runs on a six month clock under Civ. Code s.9558. On the collection side, a public works stop payment notice has its own deadline in Civ. Code Part 6 ch. 5, separate from the private version that rides the lien clock. How the stop payment notice works in California covers the mechanics on both sides.

Retention on public work is capped at 5 percent under Pub. Contract Code s.7201, and it is released 60 days after completion under Pub. Contract Code s.7107. Progress payments from a local agency run 30 days, with a 7 day invoice review period built into Pub. Contract Code s.20104.50, so a clean invoice is worth real cash flow and a rejected one costs you a full cycle. The detail on how retention flows down and when it has to reach your subs is in California retention and release.

Three code sections that are quietly on your side

Public contracting law takes several things off the table that a private owner would try to write into your contract.

Damage from an act of God is capped at 5 percent of your exposure on public work, so a catastrophic weather event is not an unlimited risk you have to carry in your bid. A contract clause limiting the agency's liability for delay to an extension of time only, the no-damages-for-delay clause you have signed on private jobs, is void on public work under Pub. Contract Code s.7102. And local agency claims at or below $375,000 run on a tiered statutory timetable under Pub. Contract Code s.20104, which means the agency owes you a response on a schedule rather than whenever it gets around to it.

Where the contract carries a time-related overhead item, payment of it through progress payments is capped at 20 percent, so plan the cash flow on extended time around that.

Escalation belongs in the bid, not the contingency

Public jobs are advertised and built on different sides of a price change. Escalate the materials and labor you can identify to the midpoint of construction, using the DGS California Construction Cost Index, and keep that number separate from contingency. Escalation is a known cost of a known duration. Contingency is a reserve against the unknown. Combine them and you lose track of both, which is the fastest way to bid a long job as if it were a short one. What to charge as a California contractor walks the markup side, and the markup and margin calculator does the arithmetic from cost to price.

Before you can bid at all

Two things gate the bid entirely, before any pricing matters. Prevailing wages apply to public works over $1,000 under Lab. Code s.1771, and the determination in force on the bid advertisement date governs for the life of the job, so you price from the one attached to the advertisement rather than the newest one you can find. DIR registration under Lab. Code s.1725.5 is required for you and every subcontractor you list, at bid time, not at award.

DIR registration and certified payroll and California prevailing wage for contractors cover both. The complete folder you need in place before a bid goes in, including the subcontractor listing threshold and the or-equal data due within 35 days after award under Pub. Contract Code s.3400, is in the California bid-ready checklist.

Pull one bid book and read the back of one section

Everything expensive about public work in California is decided before the bid opens, in language you can read for free. Open the specification on the job you are thinking about and read the measurement and payment paragraph behind the section carrying the most money in your scope. That one paragraph tells you more about the real margin than the plan set will.

On AEC Stack there is no monthly subscription. The platform fee is 2.5 percent of each invoice processed through the platform, so tracking quantities, working days and progress claims costs you nothing until the job is actually paying you.

If you want a place to keep the bid book, the quantity log and the daily controlling activity record on one job before the next advertisement lands, open a working business file and set it up on the job you are bidding now.