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San Mateo, CA Home Business: Home Daycare (2026)

Significant Restrictions
Compiled from the official code textEditor Martyn O'NeillLast verified September 2026

Key Facts

Small (1-8)
Permitted by right: all zones
Large (9-14)
Conditional use permit required
State License
CA CDSS Community Care Licensing
Fire Clearance
SM Consolidated Fire
State Law
CA H&S Code §1597.45

Summary

Small family daycare homes (up to 8 children) are permitted by right in all residential zones under California H&S Code Section 1597.45. Large family daycare homes (9-14 children) require a conditional use permit. All providers must be licensed by the California Department of Social Services.

1597.45.

(a) The use of a home as a small or large family daycare home shall be considered a residential use of property and a use by right for the purposes of all local ordinances, including, but not limited to, zoning ordinances.

(b) A local jurisdiction shall not impose a business license, fee, or tax for the privilege of operating a small or large family daycare home.

(c) Use of a home as a small or large family daycare home shall not constitute a change of occupancy for purposes of Part 1.5 (commencing with Section 17910) of Division 13 (State Housing Law) or for purposes of local building codes.

(d) A small or large family daycare home shall not be subject to the provisions of Division 13 (commencing with Section 21000) of the Public Resources Code.

(e) The provisions of this chapter do not preclude a city, county, or other local public entity from placing restrictions on building heights, setback, or lot dimensions of a family daycare home, as long as those restrictions are identical to those applied to all other residences with the same zoning designation as the family daycare home. This chapter does not preclude a local ordinance that deals with health and safety, building standards, environmental impact standards, or any other matter within the jurisdiction of a local public entity, as long as the local ordinance is identical to those applied to all other residences with the same zoning designation as the family daycare home. This chapter also does not prohibit or restrict the abatement of nuisances by a city, county, or city and county. However, the ordinance or nuisance abatement shall not distinguish family daycare homes from other homes with the same zoning designation, except as otherwise provided in this chapter.

(f) For purposes of this chapter, “small family daycare home or large family daycare home” includes a detached single-family dwelling, a townhouse, a dwelling unit within a dwelling, or a dwelling unit within a covered multifamily dwelling in which the underlying zoning allows for residential uses. A small family daycare home or large family daycare home is where the family daycare provider resides, and includes a dwelling or dwelling unit that is rented, leased, or owned.

Source: CA H&S Code §1597.45View official code

Official source re-checked September 8, 2026: the cited page had not changed since it was quoted.

Full Breakdown

Home daycare in San Mateo follows state law and local zoning. Under California Health and Safety Code Section 1597.45, small family daycare homes (up to 8 children including the provider's own) are a residential use permitted by right in all residential zones. Large family daycare (9-14 children) requires a conditional use permit from the city. All providers must obtain a license from the California Department of Social Services Community Care Licensing Division. The home must meet fire safety standards from the San Mateo Consolidated Fire Department. A city business license is required. The home occupation standards in Section 27.16.040 do not override the state daycare law: daycare has its own separate authorization. San Mateo's family-oriented neighborhoods along the Caltrain corridor have significant demand for home daycare services.

Violations & Fines

Unlicensed daycare is a state law violation with fines up to $200/day. Large daycare without a use permit violates zoning. Fire safety violations enforced by SM Consolidated Fire.

Frequently Asked Questions

Can I run a daycare from my home in San Mateo?
Yes. Small family daycare (up to 8 children) is permitted by right in all residential zones under state law. You need a CDSS license and city business license.
Does the 5-client limit in home occupation apply?
No. Home daycare has separate state law authorization under H&S Code 1597.45 that overrides general home occupation limits.
What about large daycare?
Large family daycare (9-14 children) requires a conditional use permit from the city in addition to the state license.

Sources & Official References

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Home Daycare in Nearby Cities

How other cities in San Mateo County handle home daycare.

Redwood City, CA
Light Restrictions
Daly City, CA
Few Restrictions