- Rating
- 5.0 / 5.0 from 23 reviews
- Open
- 7 days a week
- Service area
- San Francisco
- Phone
- (415) 969-2247
About
Flexible Service is an HVAC contractor in San Francisco with a 5.0-star rating based on 23 reviews. The business is open Monday through Friday from 9 AM to 7 PM and Saturday and Sunday from 10 AM to 4 PM. Reach them at (415) 969-2247.
Service Area
Serving San Francisco.
Frequently Asked Questions
What are your hours?
Monday–Friday, 9 AM–7 PM; Saturday–Sunday, 10 AM–4 PM.
How do I reach Flexible Service?
Call (415) 969-2247.
Hiring an HVAC Contractor in San Francisco, California
In California, HVAC work falls under the classification C-20 (Warm-Air Heating, Ventilating and Air-Conditioning Contractor). Before hiring a contractor for most HVAC projects, check whether your city or county requires a building permit. According to California Building Standards Code, many improvements to your home require a separate permit from your local building official. Requirements vary by location, so contact your San Francisco building department to confirm what applies to your project.
Before signing a contract, verify that any contractor you hire holds a valid California license. You can check a contractor's license status and complaint history through the California Contractors State License Board (CSLB) online portal at cslb.ca.gov. This step helps protect your investment and ensures the work meets state standards.
When reviewing a contract, take time to understand the terms, scope of work, and any binding agreements. The CSLB website offers guides on what to look for in home improvement contracts to help you make an informed decision.
What license type do HVAC contractors need in California?
HVAC contractors must hold a C-20 (Warm-Air Heating, Ventilating and Air-Conditioning Contractor) license from the California Contractors State License Board. [1]
Do I need a permit for HVAC work in San Francisco?
Building permit requirements vary by location. Contact your local San Francisco building department to find out whether your specific HVAC project requires a permit. California Building Standards Code requires permits for most alterations and improvements. [3]
How do I verify a contractor's license?
Use the CSLB license check tool at cslb.ca.gov/OnlineServices/CheckLicenseII/CheckLicense.aspx. You can search by license number or contractor name to verify their status and review any complaint history. [4]
What should I ask a contractor before hiring?
Before signing, confirm the contractor holds a valid C-20 license, understand the full scope of work and cost, ask whether a building permit is required, and review the contract terms carefully. The CSLB website offers detailed guidance on hiring contractors. [2, 3, 4]
Sources
- California CSLB — licensing classifications (read 2026-09-20)
- California CSLB — hire a licensed contractor (read 2026-09-20)
- California CSLB — do I need a building permit? (read 2026-09-20)
- California CSLB — check a license (read 2026-09-20)
Contact Information
Business Hours
| Monday | 9 AM – 7 PM |
|---|---|
| Tuesday | 9 AM – 7 PM |
| Wednesday | 9 AM – 7 PM |
| Thursday | 9 AM – 7 PM |
| Friday | 9 AM – 7 PM |
| Saturday | 10 AM – 4 PM |
| Sunday | 10 AM – 4 PM |