Checking a contractor's license
Ask for the license number
In California, contractors are licensed by the Contractors State License Board (CSLB). Ask for the license number before agreeing to any work.
Look it up
Search the number at cslb.ca.gov. The lookup shows the business name, license status and classifications.
Match the name
Make sure the name on the license matches the business on the quote and the paperwork.
Ask who will come
Ask whether the person doing the work is an employee of the licensed contractor or a subcontractor.
Permits and code questions
Routine repairs such as replacing a flapper or fill valve are generally not the kind of work people pull permits for. Moving a toilet, adding a new bathroom or changing drain and vent piping is a different matter. Rules can depend on the scope of the work, so check with the city's building department before starting anything beyond a straight repair or swap.
A careful plumber will tell you whether they believe a permit is needed and who will obtain it. If a permit is required, it should be part of the written scope rather than something left vague.
Typical toilet jobs and what to ask
| Job | What to ask |
|---|---|
| Flapper or fill valve replacement | Which part failed and how was that confirmed? |
| Reset with a new seal | What condition was the flange and floor in? |
| Shutoff valve replacement | How will it connect to the existing pipe? |
| Toilet replacement in the same spot | Does the new toilet fit the rough-in? Is a permit needed? Check with the city. |
| Moving a toilet or adding a bathroom | Who obtains the permit, and is it included in the price? |
| Main line clearing | Where was the blockage, and is a camera inspection recommended? |
Signs of a careful plumber
- Explains the cause in plain language before recommending work.
- Offers repair and replacement options when both are reasonable.
- Gives a written price before starting.
- Shows you the worn or broken part.
- Protects the floor and cleans up afterward.
- Tests several flushes and checks the base and connections before leaving.
Questions to ask before you hire
- What is your CSLB license number?
- Is the person coming an employee or a subcontractor?
- What do you think is wrong, and how will you confirm it?
- Does this work need a permit, and who obtains it?
- What is included in the written price, and what would change it?
- Do you offer any guarantee on the work, and can I have its terms in writing?
Common questions
Where do I check a plumber's license?
At cslb.ca.gov, using the license number the contractor provides.
Do I need a permit to replace a toilet?
It depends on the work. Check with the city's building department, especially if anything beyond a straight swap is involved.
Should I get more than one quote?
For larger jobs such as replacement or sewer work, comparing written quotes with the same scope can help.
General information for Fullerton, not a quote or professional advice. In an emergency, call 911.