Blog · October 14, 2026 · California
Using the San Carlos Zoning Map
A parcel's zoning district shapes building, splitting and business use near Redwood City.
Main page: San Mateo County, CA GIS & Parcel Viewer (official map link, county facts and neighboring maps).
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If you have a specific use in mind for land near San Mateo, pull up the San Carlos zoning map early: the zoning district can make or break the plan. This San Carlos guide covers: who controls zoning for a given parcel, matching a lot to its zoning district, and the questions that save a wasted trip.
Which office controls the San Carlos zoning map
Inside town or city limits, the local government adopts its own zoning map, so a lot in San Carlos is governed there. Past the city line, around Woodside, county rules apply where they exist; ask the county planning office to be sure. To find out which side of the line a parcel is on: ask whether the parcel near Atherton is inside the boundary.
The viewer San Mateo County publishes
Begin with the San Mateo County parcel viewer; it includes every tax parcel around Belmont and Foster City. With a lot near Atherton, put in a street address, an owner's name or a parcel number, then pick the result to center the map on it. On ground around San Mateo, the parcel card typically gives the owner of record, assessed acreage, a parcel ID and often a sale date.
Who handles what
Recorded documents for a parcel near Belmont sit in the index kept by the County Recorder, usually searchable by name or document number. Zoning, permits and septic questions near Redwood City are for the local planning and health departments, town or county, depending on location.
San Mateo County in a few facts
Redwood City holds the county offices, which is where the courthouse records live. Smaller places on the map include Belmont, Foster City, and Atherton. About 726,353 people live in San Mateo County (Census Bureau estimate, 2023) spread over about 449 square miles. Landmarks such as Don Edwards San Francisco Bay National Wildlife Refuge help you orient on the aerial around Atherton.
San Carlos, CA: the basics
The city is part of San Mateo County, California, so its parcels are on the county's map, at least around Burlingame. For property near Redwood City, City or town hall handles things like zoning, permits and utilities for lots inside the boundary, and the county still keeps the parcel and deed records. Lots just outside the city limits out by Woodside generally follows county rules instead.
Matching a lot to the San Carlos zoning map
Start by finding the parcel on the San Mateo County parcel viewer, copy its parcel ID, and use it when you ask the planning office near Redwood City. If the land is near Foster City, district codes like R-1, C-2 or A-1 point to a table of rules in the ordinance; don't assume a code means the same thing everywhere.
When a parcel crosses a boundary
San Mateo County touches Alameda County, San Francisco County, Santa Clara County, and Santa Cruz County, all with their own assessor records. A tract near the line by San Mateo can be split across two assessors' files, so check the neighboring map too. Out toward Woodside, our state page links every bordering county map across California.
Limits of the parcel data
Acreage on the record is an assessed number; only a licensed surveyor establishes the real lines for a parcel near Woodside. For a parcel near Woodside, records update in batches, so a deed recorded last month might lag behind.
Permits after zoning
Even when zoning allows a use near Atherton, a building permit is a separate step; health and road departments may weigh in on land there.
Reading the ordinance
On a lot around San Carlos, check minimum lot size, setbacks from each line, height limits and lot coverage. For land near Foster City, overlays, whether historic, floodplain or corridor, can add rules on top of the base district.
Questions for the planning office
When you call about land near Woodside, give the parcel number and your intended use; ask what's allowed by right and what needs a permit. Ask whether a parcel near Woodside meets current minimum size, because nonconforming lots can carry limits.
How land is described here
California is laid out under the Public Land Survey System, so deeds around Woodside reference sections and townships. A standard section is about one square mile, roughly 640 acres, with 36 sections to a township, though sections near Woodside can be irregular. Copy the legal description from the record for the parcel near Atherton when you talk to a surveyor.
When a plan doesn't fit
If your plan near Woodside doesn't fit the district, the usual routes are a variance, a special use permit or a rezoning.
Frequently asked
Does the county zone rural land near Foster City?
Short answer: land beyond San Carlos limits usually follows county rules, if any; confirm with the county office.
Can I run a business from home near Redwood City?
Usually, home businesses in the city are often allowed with conditions; the ordinance lists the details for land near East Palo Alto.
What does a rezoning in San Carlos involve?
Rezoning in San Carlos usually takes weeks to months.
What is a variance in San Carlos?
For most people, boards in this city grant variances only when strict rules cause a real hardship, at least around Redwood City.
Which office handles records for land near Redwood City?
For land near San Mateo, assessment goes to the County Assessor and deeds to the County Recorder; planning offices cover zoning near Foster City
Open the official San Mateo County, CA parcel map See it in the Platbookmapper directory
Not a survey. County GIS and tax parcel maps are assessment and planning layers. They are not a substitute for a recorded plat, deed, or licensed survey, especially for fences, setbacks, or boundary disputes.