How to Verify a Contractor Before Hiring Them in California

Boathouses neighborhood in Encinitas, California near Moonlight Beach and the Pacific Ocean.

A Homeowner’s Guide to Licensing, Insurance, Workers’ Compensation, Permits & Identifying Legitimate Local Companies

Hiring a contractor for plumbing, water heaters, drains, water treatment, or home repairs can feel overwhelming — especially when every company claims to be “licensed,” “insured,” and “local.”

Unfortunately, not every company follows the rules. Some contractors operate without proper insurance, some improperly claim workers’ compensation exemptions while still using crews, and others advertise themselves as “local” without actually having a legitimate presence in the communities they target.

Before hiring any contractor, here are some important things homeowners should verify.

1. Verify the Contractor’s License

In California, contractors performing work valued at more than $500 (labor and materials combined) are generally required to hold a valid contractor license.

You can verify a contractor license directly through the California Contractors State License Board (CSLB).

What to check:

License number
License classification
License status (active/inactive/suspended)
Business name
Workers’ compensation status
Bond information

A legitimate contractor should willingly provide their license number. If a company refuses to provide it, that’s a red flag.

2. Check Workers’ Compensation Coverage

One of the most overlooked issues is workers’ compensation insurance.

Workers’ compensation coverage helps protect:

workers injured on the job
homeowners from liability exposure
and the contractor’s employees

Why this matters:

If a worker is injured at your home and the contractor does not carry proper coverage, problems can become very complicated very quickly.

On the CSLB license lookup page, look for:

“Workers’ Compensation: Active”
OR
“Workers’ Compensation: Exempt”

Important:

Some companies file exemptions claiming they have no employees.

However, if a company regularly shows up with multiple workers or installers, they should generally have proper workers’ compensation coverage in place.

If you see crews working but the CSLB listing shows an exemption, that may be worth asking questions about.

How to verify this:

On the CSLB license page, there is also a “Personnel List” section that shows the company’s officers or personnel of record.

In many cases, corporate officers or owners with at least a qualifying ownership percentage may legally exempt themselves from workers’ compensation coverage.

However, workers or installers who are NOT listed as officers or exempt personnel would generally still require proper workers’ compensation coverage if they are employees of the company.

In simple terms:

If the company claims “no employees”
but regularly sends multiple non-owner workers to jobsites
homeowners may want to ask additional questions about coverage and compliance

3. Verify General Liability Insurance

General liability insurance protects homeowners if property damage occurs during the project.

Examples include:

water damage
accidental flooding
damaged flooring
broken gas lines
electrical damage
or other accidental losses

Not all contractors carry proper liability coverage.

Homeowners should feel comfortable asking:

“Do you carry general liability insurance?”
“Can you provide a certificate of insurance?”

Professional companies expect these questions.

4. Verify They Are Actually Local

Many companies advertise themselves as “local” while operating from completely different areas.

Some businesses:

rent virtual offices
use mailbox stores
use fake local addresses
or advertise heavily in cities where they have no actual presence

Ways to verify:

Check the address listed on CSLB
Look up the business on Google Maps
Search the address itself
Verify city business licenses where applicable
Look for local reviews and completed projects

A true local company usually has:

an established service history
local customer reviews
recognizable service vehicles
and a real presence in the community

One easy way to spot questionable contractor listings is by checking whether the business information is consistent everywhere online. A properly operating company will usually have matching addresses across their CSLB license, Secretary of State filings, website, Google Business Profile, Yelp profile and other business listings. If all the addresses are different or inconsistent, that should raise questions.

You can also learn a lot by looking at where a company chooses to maintain its online presence.

Today, Google is the primary search platform most homeowners use to research local contractors. Legitimate local businesses typically maintain:

a Google Business Profile
Google reviews
service area information
photos of completed work
and an established presence in Google Maps

If a contractor only appears on platforms like Yelp or social media, but has little or no Google presence at all, that can sometimes be worth looking into further.

While there may be legitimate reasons in some cases, homeowners should ask:

Why is there no Google Business Profile?
Why are there no Google reviews?
Is the business actually established locally?
Is the listed address legitimate?

These are all reasonable questions when hiring someone to work inside your home.

5. Ask About Permits

Certain plumbing and water heater installations require permits and inspections.

Examples may include:

water heater replacements
gas line modifications
re-pipes
sewer replacements
and certain water treatment systems

Permits help ensure:

code compliance
safety
and proper installation practices

If a contractor immediately says:

“We don’t need permits for anything,” that can be another red flag.

For example:

water heater replacements often require permits
pressure regulator installations may require code compliance corrections
and gas-fired appliance installations must meet current safety requirements

Homeowners considering water heater replacement, pressure regulator installation or water quality improvements can also learn more about our Water Heater Installation, Pressure Regulator, and Water Conditioning Services.

6. Read Reviews Carefully

Don’t just look at the star rating, read the reviews themselves.

Look for:

professionalism
communication
long-term customer satisfaction
warranty support
and whether the company resolves problems properly

A trustworthy company should also have:

consistent branding
a professional website
accurate contact information
and transparent communication

7. Beware of Extremely Low Pricing

Price matters — but extremely low bids sometimes come with:

lack of insurance
lack of licensing
corner-cutting
no permits
or improper installations

A properly licensed and insured contractor has real overhead:

insurance
bonding
licensing fees
payroll
training
permits
and compliance requirements

Those protections ultimately help protect the homeowner.

Final Thoughts

Most homeowners are not looking to become experts in contractor law or insurance requirements. They simply want someone trustworthy working in their home.

Taking a few minutes to verify licensing, insurance, workers’ compensation status, permits, and local presence can help avoid major problems later.

Before hiring any contractor: