Web design for contractors in California: what your site needs

A California trade website has to do two things other states let you skip: show your CSLB license number and business name exactly as licensed, and make sense to customers across very different regions. After that, it needs what every trade website needs — a tap-to-call number, clear services and real reviews.

Not legal advice. Rules change, so check the current wording with your licensing board before you publish.

Your CSLB license number goes in all advertising

Under California Business and Professions Code section 7030.5, every licensed contractor must include their license number in contracts, bids and all forms of advertising. The Contractors State License Board spells out that this covers online advertising and directories, not just print — so your website counts.

It applies to the trades CSLB licenses, including:

• C-10 Electrical
• C-36 Plumbing
• C-20 Warm-Air Heating, Ventilating and Air-Conditioning

Use your business name exactly as it is registered with CSLB, next to the number. Put both where people see them — beside the phone number in the header works well — and repeat them on your contact page, quotes and invoices.

Pest control companies are licensed by the Structural Pest Control Board, and auto repair shops register with the Bureau of Automotive Repair. Check your own board's advertising rules for the exact wording.

The number also sells. Californians are told to check a contractor's license at cslb.ca.gov before they hire, and showing it up front saves them the step.

One state, several markets

Los Angeles, the Bay Area, San Diego, Sacramento, the Inland Empire and the Central Valley are different markets with different prices and different searches. People type the city: "electrician Pasadena", "AC repair Fresno", "plumber San Jose".

• A service area section naming the cities and counties you actually cover
• One page per main service, each naming the area: "Panel upgrades in Irvine and Costa Mesa"
• Your business name, address and phone number written the same way on your website as on your Google Business Profile

Leave out places you will not drive to. In California traffic, a far-off job can cost you the rest of the day.

Say what California homeowners are worried about

The best service pages answer the question already in the customer's head. In California, a few come up again and again:

• Heat waves and wildfire smoke. HVAC companies can say whether they install better air filtration, and whether they offer same-day repair in a heat wave.
• Earthquakes. California requires water heaters to be braced or strapped. A plumber whose website mentions water heater strapping answers a question plenty of homeowners never knew to ask.
• Electrification. Heat pumps, EV chargers and panel upgrades are common searches. If you do them, give each its own page.

Make it easy to read and use

Website accessibility complaints against small businesses are common in California, and an accessible site is also simply easier for customers to use:

• Text large enough to read, with strong contrast
• Photos with short descriptions for screen readers
• Form fields with clear labels
• A phone number that works as a tap-to-call link

Speak your customers' language

California homeowners speak many languages, Spanish most of all. If you or your team take calls in Spanish — or Chinese, Vietnamese or Tagalog — say so beside the phone number. Only say it if the person answering the phone really can.

Reviews do more than design

Most people read your Google reviews before they call. Link to them from your website, or quote a few real ones with first names and towns.

Ask every happy customer the same day. The review request generator writes the text message for you.

California trade website checklist

• CSLB license number and licensed business name on the home page and contact page
• Tap-to-call phone number at the top of every page
• Service area with real cities and counties
• One page per main service, including heat pumps, EV chargers or panel upgrades if you do them
• Readable text, labeled forms and described photos
• Name, address and phone number matching your Google Business Profile
• Recent reviews
• Fast on a phone

Get the words written

• Service page copy generator — a page for each service you offer
• Google Business Profile generator — the description that shows in Maps
• FAQ generator — the questions callers ask before they book
• Tools by trade: plumbers, electricians, HVAC, pest control and auto repair

Rather not build it yourself? The Trade Website Bundle is a finished website designed for your business, with click-to-call on every page — live in 10 days.

Quick answers

Does a California contractor need a license number on their website? Yes. Business and Professions Code section 7030.5 requires licensed contractors to include their license number in all forms of advertising, and CSLB applies that to online advertising.

Which license classifications cover electricians, plumbers and HVAC in California? C-10 for electrical, C-36 for plumbing, and C-20 for warm-air heating, ventilating and air-conditioning.

Where do California customers check a contractor's license? On the Contractors State License Board's website, cslb.ca.gov.