How to read a California prevailing wage determination

What a determination is, and where it comes from

A California prevailing wage determination is not a single number you can look up once and reuse. It is a document — issued for one craft, one county, and one effective-date window — that the Director of Industrial Relations publishes under Labor Code §1773. The Department of Industrial Relations (DIR) maintains hundreds of these at any given time, because the rate for an electrician in Los Angeles County is a different document from the rate for an electrician in Fresno County, and both are different again from the rate for a laborer in either place. Before you can read a determination correctly, you have to be looking at the right one: the correct craft classification, the correct county, and — as covered below — the correct effective date. Grabbing the first result for "electrician prevailing wage" and assuming it applies statewide is how underpayment happens on paper even when the intent was to pay correctly.

Basic hourly rate vs. fringe benefits

Every line of a determination splits into two obligations that together make up the "general prevailing rate of per diem wages" defined in Labor Code §1773.1: a basic hourly rate paid directly to the worker, and a set of fringe benefit payments the employer makes on the worker's behalf. The determination lists these as separate dollar amounts per hour, not as one lump total. That separation matters for compliance: your total labor cost has to equal or exceed the sum of the columns, but you generally cannot use a surplus in one column to cover a shortfall in another — a point covered in more depth in our piece on fringe benefits.

• Health and welfare
• Pension
• Vacation or holiday pay
• Apprenticeship and training fund contributions
• Other employer payments the specific determination may list (travel, subsistence, industry promotion funds)

Holidays and overtime are set per craft, not by one statewide rule

A determination identifies which holidays that craft recognizes for premium pay and how overtime is calculated for that trade. This is where general contractors moving between crafts get tripped up: overtime on prevailing-wage work is not simply time-and-a-half after eight hours under the state's general eight-hour-day statute (Labor Code §1810–§1815). The determination for each craft layers its own overtime and holiday premium structure on top of that baseline, usually by reference to the collective bargaining agreement that applies to that trade and area. Two crews on the same job site, in different crafts, can legitimately be on two different overtime schedules and two different holiday calendars — both correct, because each is following its own determination rather than a single company-wide policy.

Travel and subsistence

Some crafts carry a travel and subsistence component — additional per diem pay when a worker is dispatched to a jobsite beyond a set radius from the union hall or shop, sometimes structured in tiered zones. This is included in the definition of per diem wages under §1773.1, and it is usually incorporated into the determination by reference to the trade's master labor agreement rather than spelled out line-by-line on the summary page. If your workforce is being dispatched any real distance, check whether the applicable determination has a travel provision before assuming it doesn't. Silence on the top-line rate sheet does not always mean there isn't one; it often means you have to pull the referenced agreement to see the actual schedule.

Effective dates and the bid-advertisement lock

This is the rule that decides which document governs the whole job: under Labor Code §1773.2, the awarding body has to specify, in the call for bids and in the contract, the general prevailing rate in effect at the time the contract is advertised for bid. That determination — not whatever is current when work actually starts, and not whatever happens to be current when a particular worker clocks in — governs for the life of the contract. A project that takes eighteen months to build can run entirely on a determination that was locked in before a shovel hit the ground.

• A determination is craft + county + effective date, not a floating "current rate"
• It locks to the bid-advertisement date under §1773.2, not the notice-to-proceed or start date
• It governs for the life of the contract, including any predetermined increases already published inside it
• Pulling a fresh, current-dated determination mid-project and paying against it is a common, avoidable error

Predetermined increases, and why the lock doesn't freeze you

The bid-advertisement lock has one built-in exception, and it isn't really an exception at all: many determinations already contain scheduled future rate steps, published in the same document, effective on stated future dates. These are commonly called predetermined increases, and determinations often flag them with an asterisk or footnote next to the affected rate. Because the increase was already published in the determination that was in effect at bid time, it isn't a new rate you're being asked to absorb — it's a term of the rate you already locked in, and you owe it on the date it takes effect regardless of where you are in the job.

Determinations vary in how they mark this: a single asterisk for one kind of note, a different mark or numbered footnote for another. Treat the footnote key printed on the specific determination you're using as authoritative rather than assuming a symbol means the same thing on every document you've seen before. What every determination agrees on is the underlying mechanic — read the whole document, not just the top-line rate, or a predetermined increase will catch a long job by surprise partway through.

This article is educational and does not constitute legal or tax advice. Statutes and agency requirements change; confirm current rules with the California DIR, the U.S. Department of Labor, the IRS, or qualified counsel before relying on them. Aeternus Dynamics is a compliance and advisory firm, not a law or accounting firm.