Most of your jobs are under $500 and one of them is not: going out on your own with a C-28

Nobody else in construction runs a business shaped like this one. A framer has ten jobs a year. You might have ten jobs by lunch. Rekeys, a stuck closer, a panic device that will not latch, a master key system for a property manager, then one Friday a full hardware set on a new storefront worth more than the rest of the week put together.

That last job is the reason the C-28 Lock and Security Equipment license exists, and it is why the threshold in BPC s.7048 matters more to you than to almost any other trade. Everyone else crosses it on their first job and never thinks about it again. You cross it and go back under it several times a week. In California the license and the business are one decision anyway, because experience, two exams, a $25,000 bond, workers compensation and the entity choice all land inside the same application.

The $500 test, and what it is actually measuring

A contractor license is required at and above the minor work threshold of $500 in combined labor and materials (BPC s.7048). Two words in that sentence do the work.

Combined. It is not a labor test. Materials count. A service call that is mostly parts gets there faster than one that is mostly time.

Threshold. No averaging across a week, no annual allowance, no rounding in your favor. Each project of work is measured on its own.

Run it on a real morning. Six cylinders rekeyed at a small office: $260 of labor, $180 of cylinders and keys, $440 total, under the line. The client then asks for a closer and a strike on the way out, $110 of parts and $60 of labor, and the same visit is $610. Nothing about the skill changed. The side of the line changed.

The consequences of being on the wrong side are not proportionate to the ticket size. Unlicensed contracting is a criminal offense (BPC s.7028). An unlicensed contractor cannot sue for compensation (BPC s.7031(a)), and the hirer can claw back everything already paid (BPC s.7031(b)). That last one is the sting here: the exposure is not the $610 job, it is every job you did for that client. Do you need a contractor license in California works through the threshold.

One more rule this trade breaks by accident: your license number goes on contracts, subcontracts, bids and advertising (BPC s.7030.5). Advertising means the van, the website and the listing. And selling locksmith services to the public carries a separate state registration through the Bureau of Security and Investigative Services, which does not substitute for the contractor license.

What a C-28 covers, and the classification next door

The classifications live in the 16 CCR 832 family, and the rule underneath them is that work outside the classification you hold is not permitted (BPC).

A C-28 is locking and security hardware: locks, cylinders and keying systems, door closers and operators, exit and panic hardware, safes and vault doors, security gratings, bars and screens.

The boundary that matters most here is electronic. The moment the job is a card reader network, a camera system, an intercom or a low voltage head end rather than the hardware on the door, that is C-7 territory. Plenty of security businesses hold both, and it is the most common pairing on this classification.

Where a job takes two unrelated building trades or crafts and you want the prime contract, that is a B under BPC s.7057(a), which comes up when a tenant improvement fit out gets sold as one package.

Commercial doors are an accessibility item, and that is your best lead source

California accessibility runs in two chapters of the CBC alongside the ADA, and door hardware shows up on report after report, because a door a person cannot operate is the failure everyone can see. Where a commercial project triggers a path-of-travel upgrade obligation, that obligation is capped at 20 percent of the project cost, which turns it into a budget with a ceiling and a priority order rather than an open-ended demand.

The document to know is the CASp report. A CASp inspection produces a report and a certificate, and commercial leases must disclose CASp status. Read what that means commercially: every CASp report in your county is a list of hardware items somebody has been told to fix, held by an owner who now has it in writing. A C-28 who can quote from one is selling into demand that already exists. The California accessibility and CASp guide covers reports and certificates.

The other commercial trap is timing. When your hardware ties into a fire alarm or an egress release, that interface is a deferred submittal routed through the design professional and not installed before approval. Order against the approved submittal, never against the first schedule you were sent.

The city layer nobody warns you about

The contractor license is a state license, but the right to do business in a city is a city business tax certificate, with its own registration, renewal and fee, and a locksmith running service across a dozen municipalities is running a dozen of those. List the cities you actually work in, sorted by revenue, register in that order, and keep the renewal dates in one place. The city business license guide covers the pattern.

Getting paid on small tickets, and on the one big one

Small ticket work is usually paid on the spot. The risk sits in commercial fit out work where you are a subcontractor to a general contractor, and two rules protect you there. Serve a preliminary notice within 20 days of first furnishing (Civ. Code s.8204), and a late one still protects the 20 days before service and everything after, so it is always worth serving. Then the prime pays you within 7 days of receiving its progress payment (BPC s.7108.5), with withholding for a good faith dispute capped at 150 percent of the disputed amount.

Put dates on it. The GC receives the owner's progress payment on 9 March 2026, so your money is due by 16 March 2026. If $1,200 of your $14,000 is genuinely disputed, the maximum they can hold is $1,800, and the other $12,200 is late from the 17th. That ceiling is the whole conversation, because holding an entire invoice until a small item is resolved has a legal limit on it. Getting paid in 30 days in California covers the chain from owner to prime to sub.

Residential work above $500 runs on home improvement contract rules (BPC s.7159): written, prescribed headings and type sizes, a down payment capped at the lesser of $1,000 or 10 percent of the contract price, and change orders signed before the extra work starts. A $340 rekey does not need one. A $3,800 hardware and security screen job does, from the same client in the same month. The home improvement contract guide covers the form.

Four years, two exams and the money to open the doors

Four years of journey-level experience inside the ten years before you file (16 CCR 825), counting a journeyman, foreman, supervising employee or contractor, with education offsetting up to three of those four years. The C-28 detail worth getting right is that the certification has to show the installation and hardware side of your work, not only service calls, because this is a construction classification and the application reads as one. The experience requirement guide covers who can sign it.

Then two papers, Law and Business at about 115 questions and the C-28 trade exam at about 100, multiple choice, closed book at a PSI test center, calibrated per version rather than scored against a published fixed percentage. For this trade the Law and Business paper is the one to respect, because a service business touches licensing, contract and payment law less often than a general contractor does (the exams guide). Then the cash: $450 application fee, $200 initial license for a sole owner or $350 otherwise (CSLB fee schedule), the $25,000 bond (BPC s.7071.6), an additional $100,000 bond if you form an LLC (BPC s.7071.6.5), and workers compensation before the first employee, because a lapse suspends the license by operation of law on the day cover ends. Getting your CSLB license is the order of operations, the bond and qualifier guide is the bond, and LLC versus sole proprietor is the entity call.

Where the C-28 work is

Los Angeles, San Francisco, San Diego and Sacramento publish building permits, and a tenant improvement permit is a hardware package nobody has bought yet. Public work over $1,000 is prevailing wage work with DIR registration required for you and every listed subcontractor before bidding, renewed each July 1, and school and municipal buildings rekey and replace exit devices on a cycle. Where work is starting in California covers the sources, and getting on GC bid lists covers the fit out side, where the repeat commercial work lives.

Price the line, not the job

The trade runs on volume, so the pricing question is not what one job is worth. It is what an hour with a stocked van is worth, and whether the parts on that van carry a markup that survives a week of small tickets. Run a normal service call through the markup and margin calculator and check whether your standard rate covers the drive, the stock and the warranty return, because on ticket sizes this small the leak is never dramatic and it is always constant. What to charge as a California contractor works the rate itself.

On AEC Stack there is no monthly subscription. The platform fee is 2.5 percent of each invoice processed through the platform, so a business built on small invoices only pays on the ones that land.

Pull the last twenty tickets you wrote and mark each one over or under $500. How many crossed is your answer on whether the license is the next thing you do. Then open a working demo business and put a week of real tickets through it.