Your CSLB license number on contracts, quotes and ads

Where your CSLB license number has to go

The core rule is one sentence long. Under Business and Professions Code section 7030.5, every licensed contractor must include their license number in all construction contracts. The same goes for subcontracts and calls for bid, and for all forms of advertising. CSLB’s advice to homeowners puts it plainly. Contractors must have their license number on their business card and on all bids and contracts. Every ad needs it too, from an online ad to the company name on the side of a truck.

What counts as advertising is set out in the board’s regulation, Title 16, section 861. The list is wide. It names any card, contract proposal, sign, billboard, lettering on vehicles, brochure, pamphlet, circular, newspaper, magazine, airwave ad, any electronic transmission, and any directory listing for contractor work. CSLB’s advertising guide adds that this includes any website or post that solicits business on the internet.

So in practice, the number belongs on:

• Every construction contract you sign, including home improvement and service and repair contracts.
• Every quote, estimate, bid or proposal you send a customer.
• Subcontracts, and the invitations to bid you send to subs.
• Business cards, letterhead, flyers, door hangers, brochures, and yard or job-site signs.
• Your website, social media profiles, posts that ask for work, online ads and directory listings.
• Newspaper, magazine, radio and TV ads.
• The lettering on your work trucks and vans.

References: California Legislative Information: Business and Professions Code section 7030.5 (opens in a new tab) · CSLB: 2026 California License Law and Reference Book (Title 16, section 861: “Advertising” defined) (opens in a new tab) · CSLB: Fast Facts, Advertising Guidelines for Contractors (opens in a new tab) · CSLB: How do I find the right licensed contractor? (opens in a new tab)

Quotes, bids and subcontracts count, not just signed contracts

It’s easy to put the number on the contract and forget the quote. The regulation lists “contract proposal” as a form of advertising, and CSLB tells homeowners that contractors must have the number on all bids. So the estimate you send from the truck needs it as much as the contract the homeowner signs later.

This gets harder when quotes go out from more than one place. For example, a 6-truck HVAC company might send quotes from a field app, from the office in a word processor, and as a quick price by text. Each one is a proposal. If only the office template carries the number, two out of three quotes go out without it.

The rule runs both ways on a job. When you send subs an invitation to bid, or sign a subcontract with them, your license number goes on it. When you work as the sub, your number goes on what you sign and send to the general contractor. Because each licensee must include their own number, a subcontract usually shows both.

A simple test: pull the last five quotes your business sent, from every source, and look for the number. The regulation’s list also includes “any electronic transmission.” So the easy habit is to put the number in every email signature and saved text reply your team uses for quotes.

References: CSLB: 2026 California License Law and Reference Book (Title 16, section 861: “Advertising” defined) (opens in a new tab) · CSLB: How do I find the right licensed contractor? (opens in a new tab) · California Legislative Information: Business and Professions Code section 7030.5 (opens in a new tab)

The license header on contracts and change orders

On a contract, the number sits in a short header, and what goes in that header depends on the type of contract. For a home improvement contract, section 7159 requires the contractor’s name, business address and license number. If a home improvement salesperson solicited or negotiated the deal, their name and registration number go in too. That list applies to the contract and to any changes to it, so the same header belongs on every signed change order.

Salespeople have one more duty. Before they start soliciting, section 7152 requires them to tell the homeowner the business name and license number of the contractor they represent. Their business cards should carry your name and number, not just their own.

A small job written up as a service and repair contract under section 7159.10 needs the same three details: your name, business address and license number.

Section 7030 adds a CSLB notice. On home improvement and service and repair contracts, a set statement headed “Information about the Contractors State License Board (CSLB)” goes in at least 12-point type. On other written contracts where you’re the prime contractor, a different set statement about CSLB’s complaint deadlines goes in at least 10-point type. Copy the wording from the current law, not from an old form.

Your subs’ numbers matter too. When a home improvement contract uses subcontractors, the homeowner can ask for a list of them with their license numbers, which is quick to produce when you keep subcontractor license details on file.

Everything else a home improvement contract must say, from the signed date and payment terms to the cancellation notice, is in our home improvement contract checklist. For the license details, the header is short:

• The business name exactly as it appears on your license.
• Your business address and license number.
• The salesperson’s name and registration number, when one sold the job.
• The right CSLB notice for the contract type, in the required type size.

References: California Legislative Information: Business and Professions Code section 7159 (opens in a new tab) · California Legislative Information: Business and Professions Code section 7152 (opens in a new tab) · California Legislative Information: Business and Professions Code section 7159.10 (opens in a new tab) · California Legislative Information: Business and Professions Code section 7030 (opens in a new tab) · California Legislative Information: Business and Professions Code section 7117 (opens in a new tab) · CSLB #25-04: New Laws Affecting Contractors Starting in 2026 (opens in a new tab)

How customers check the license number you print

CSLB tells homeowners that seeing a license number doesn’t necessarily mean the license is valid, so they should check it. They can use CSLB’s Check a License tool online, or call (800) 321-CSLB (2752). The tool searches by license number, business name or a person’s name, and it also looks up home improvement salesperson registrations.

The record shows the license status and the address of record. CSLB says workers’ compensation and liability insurance information is there too, and the tool includes complaint disclosures. CSLB also tells homeowners to ask for the pocket license and a photo ID at the bid, and for a salesperson’s registration card.

So anyone can check the number you print. Make sure the business name on your quotes, contracts, trucks and website matches your license record, and keep your address of record current. If the two don’t match, expect questions before the contract is signed.

References: CSLB: How do I find the right licensed contractor? (opens in a new tab) · CSLB: Check a License (opens in a new tab)

Ads, website, social media and trucks: a checklist

Where a number goes missing depends on how you find work. For example, after a storm a roofer might post before-and-after photos with “booking repairs this week” and leave door hangers on the street. The post, the profile bio and the door hanger all ask for work, so all three need the number. An HVAC company’s tune-up mailer and its email version are two separate ads, too.

Each place you ask for work is its own ad, so each one needs the number. Go down this list once a year, and whenever you add a new channel:

• Website. Put the number in the footer so it shows on every page, including pages you add later, and on your contact page.
• Social media. Put it in your profile bio and in posts that ask for work. CSLB names any post that solicits business online.
• Online directories and review sites. Add it to your business profile and description. The regulation names any form of directory listing for contractor work.
• Paid online ads, mailers and door hangers. Each is a separate ad, so check each one, not only the page it links to.
• Radio and TV. The regulation lists airwave ads, so the number belongs in the script or on screen.
• Business cards, letterhead and signs. That includes yard signs at job sites and cards for every salesperson.
• Vehicles. For most contractors, section 7029.6 requires your business name and license number in or on each commercially registered vehicle used in your construction business. It must be clearly visible, in at least 72-point type or letters ¾ inch high and wide.
• Plumbing, sign and well-drilling vehicles. C-36, C-45 and C-57 contractors follow section 7029.5 instead: name, permanent business address and license number on each side, in letters at least 1½ inches high. The same applies to any rig used to drill water wells.

References: CSLB: Fast Facts, Advertising Guidelines for Contractors (opens in a new tab) · CSLB: 2026 California License Law and Reference Book (Title 16, section 861: “Advertising” defined) (opens in a new tab) · California Legislative Information: Business and Professions Code section 7029.6 (opens in a new tab) · California Legislative Information: Business and Professions Code section 7029.5 (opens in a new tab)

Other ad rules that trip contractors up

The number isn’t the only thing CSLB looks at in an ad. A few related rules are easy to break by accident:

• Use the name on your license. Section 7117 makes contracting under any name other than the one on your license a cause for discipline. If your trucks, website and quotes use a different name, fix one or the other. A business name change goes to CSLB within 90 days under section 7083.
• Advertise only work your license covers. Section 7027.1 bars advertising in a classification you don’t hold, though A and B contractors may advertise as general contractors. CSLB’s own example: a C-29 masonry contractor can’t advertise electrical work without a C-10 license. Doing work outside your classification is a separate cause for discipline under section 7117.6.
• Don’t mention your bond. Section 7071.13 makes any reference in advertising to a bond required under the contractors’ license law, such as your license bond, a ground for suspension. CSLB’s guide says not to note in ads that you’re bonded. That includes the familiar line “licensed, bonded and insured.”
• Keep claims true. Section 7161 makes false, misleading or deceptive advertising for improvement work a misdemeanor.
• Asbestos work. CSLB’s guide says these ads also need the name you’re certified and registered under, plus the Cal/OSHA certification and registration numbers for anyone doing asbestos work.
• Not licensed yet? Under section 7027.2, someone without a license may advertise only for jobs under $1,000 in total, and the ad must say they’re not licensed.

References: California Legislative Information: Business and Professions Code section 7117 (opens in a new tab) · California Legislative Information: Business and Professions Code section 7083 (opens in a new tab) · California Legislative Information: Business and Professions Code section 7027.1 (opens in a new tab) · California Legislative Information: Business and Professions Code section 7117.6 (opens in a new tab) · California Legislative Information: Business and Professions Code section 7071.13 (opens in a new tab) · CSLB: Fast Facts, Advertising Guidelines for Contractors (opens in a new tab) · California Legislative Information: Business and Professions Code section 7161 (opens in a new tab) · California Legislative Information: Business and Professions Code section 7027.2 (opens in a new tab)

What happens if the number is missing

CSLB’s advertising guide says leaving your license number off can bring a civil penalty. Missing contract details and notices are cause for disciplinary action under sections 7030 and 7159. Under section 7099, CSLB can issue a citation instead, and a citation can include a civil penalty.

A new version of section 7099.2, which sets the minimum and maximum civil penalty for a citation, took effect on July 1, 2026. Penalty figures in older guides may be out of date, so check current amounts with CSLB.

This isn’t legal advice. Your city or county may also have its own business license or sign rules. Confirm anything you’re unsure about with CSLB or a lawyer.

References: CSLB: Fast Facts, Advertising Guidelines for Contractors (opens in a new tab) · California Legislative Information: Business and Professions Code section 7030 (opens in a new tab) · California Legislative Information: Business and Professions Code section 7159 (opens in a new tab) · California Legislative Information: Business and Professions Code section 7099 (opens in a new tab) · California Legislative Information: Business and Professions Code section 7099.2 (operative July 1, 2026) (opens in a new tab) · CSLB #25-04: New Laws Affecting Contractors Starting in 2026 (opens in a new tab)

Keep it in one record so every document fills it in

A number can go missing without anyone choosing to leave it off. It can come from an old template, a new quote tool nobody set up, or a detail fixed in one place but not the others. The cure is to keep your license details in one record and have every document read from it.

Then check every document that reads from it: quote, contract, change order, invoice, subcontract, bid invitation, email signature and website footer. Invoices aren’t named in section 7030.5, but when the header comes from one record, there’s no reason to leave it off. Keep a copy of each document exactly as it was sent, so you can show a homeowner or CSLB what went out.

When something changes, like a new address or business name, report it to CSLB within 90 days and update the record once. Every document after that carries the new details. If you already keep customers and jobs in one place, it can hold this too. See what a CRM does for a construction company.

If you use a quoting or field service app, find where its templates take your license number. Then check that it prints on every document the app sends: quotes, contracts, invoices, emails and any online approval page. If it does, that may be all you need. Our guide to custom or off-the-shelf software helps if you’re weighing a change.

Whatever tool you use, the record should hold:

• Your business name exactly as it appears on your license.
• Your license number, classifications and expiry date. Licenses run for two years under section 7140, so set a renewal reminder.
• Your business address, phone number and email address, which home improvement contracts now also need for cancellation notices.
• Each salesperson’s registration number, so their contracts fill in the right one.
• The current wording of each CSLB notice, matched to the contract type it belongs on.

References: California Legislative Information: Business and Professions Code section 7030.5 (opens in a new tab) · California Legislative Information: Business and Professions Code section 7140 (opens in a new tab) · California Legislative Information: Business and Professions Code section 7083 (opens in a new tab) · California Legislative Information: Business and Professions Code section 7159 (opens in a new tab) · CSLB #25-04: New Laws Affecting Contractors Starting in 2026 (opens in a new tab)

How we build this into a contractor’s system

When we build custom business software for a California contractor, the license details live on one settings screen. Quotes, contracts, change orders, invoices and the crew phone app all read from it, and so does the website footer when we build the website too. Change the address once, and every new document carries it.

If you already have custom software and only need its templates fixed, that’s usually a focused fix: $750–$3,000 over 1–⁠2 weeks. If someone else built it, we review it first. One business system, like quotes, contracts and invoices connected to QuickBooks Online, is $6,000–$18,000 over 6–⁠10 weeks. These are our prices as of October 4, 2026.

Our first call is free, and you get a fixed price in writing within 48 hours of it. Bring one copy of each document you send today. This isn’t legal advice, so have CSLB or a lawyer confirm your templates and notices.