Zoning & general plan
San Mateo parcels often straddle city, county, and bay / shoreline contexts. Confirm jurisdiction and the controlling general-plan land use before design spend.
California · County guide
San Mateo County
San Mateo County spans bay flats, Peninsula valleys, and Santa Cruz Mountains. Coastal and mountain parcels are steep; bayshore cities sit on gentler fill and alluvium. Paste an address or APN for a first-pass screen of zoning, land use, FEMA flood, CAL FIRE / WUI wildfire hazard, soils, slope, and geology — every line linked to the official source. Verify entitlements with San Mateo County planning before you buy or build.
Useful sources for searching San Mateo County: Official sources to verify buildability in San Mateo County ↓
About San Mateo County land & parcels
San Mateo County spans bay flats, Peninsula valleys, and Santa Cruz Mountains. Coastal and mountain parcels are steep; bayshore cities sit on gentler fill and alluvium.
What landowners and buyers usually check
In San Mateo County, buyers and landowners usually run the screens below early because San Mateo County spans bay flats, Peninsula valleys, and Santa Cruz Mountains. Coastal and mountain parcels are steep; bayshore cities sit on gentler fill and alluvium. Elevation spans Sea level to about 2,600+ ft in the Santa Cruz Mountains, so two nearby APNs can need totally different diligence. Local pattern: Mountain and coastal lots frequently need slide, grade, and WUI diligence.
FEMA flood & drainage
Bay-edge, wetland, delta, and low-lying flats in San Mateo often carry FEMA and drainage questions even when the lot looks level. Screen NFHL zones and ask about local drainage history.
CAL FIRE / WUI wildfire
San Mateo has extensive wildland–urban interface and hillside / ridge exposure. CAL FIRE / WUI severity drives insurance, defensible space, and often design cost — screen every APN.
Parcel boundary & APN
Confirm you are looking at the correct APN and boundary against San Mateo County assessor records — listings and informal maps are wrong often enough to kill deals after deposits.
Soils (SSURGO)
Bay fill, alluvium, and hillside soils in San Mateo change septic, drainage, and grading feasibility. Screen SSURGO, then verify with environmental health / geotech as needed.
Slope, elevation & access
Screen slope and elevation on the APN in Parcel View, then confirm grading, driveway grades, and pad feasibility with San Mateo County planning and a licensed surveyor/engineer.
Geology & seismic
San Mateo buyers commonly check liquefaction, fault, and landslide screens where the state publishes them — especially on bay fill and hillside lots.
Local terrain context
San Mateo spans patterns like “San Francisco Bay shoreline flats and fill” and “Peninsula valley floors.” Match the APN to the right landform story — valley-floor diligence differs from ridge or canyon lots.
Housing & land patterns
Median home
$1.56M
Median income
$159k
Ownership
59%
Median year built
1966
vs California
+105%
Terrain
San Francisco Bay shoreline · Peninsula valley floors · Santa Cruz Mountains ridges
San Mateo County spans bay flats, Peninsula valleys, and Santa Cruz Mountains. Coastal and mountain parcels are steep; bayshore cities sit on gentler fill and alluvium. Housing context: a high-value housing market well above the California ACS median, above-average household incomes, a nearly even owner/renter split, and housing stock primarily built during the mid- to late-20th century.
Housing market
Median home value
$1.56M
$1,559,600
Much higher than CA
Median rent
$2,922/mo
Median household income
$159k
$158,855
Much higher than CA
Vacancy rate
7.9%
+105% vs California ACS median
Housing characteristics
1966
19202025
Typical home age signal — not a forecast of new construction.
Affordability & housing mix
Home value ÷ income
9.8×
ACS proxy — median home value divided by median household income
Rent ÷ income
22%
Annual median gross rent as share of median household income
Rent burden 30%+
36%
Share of renter households paying 30% or more of income on gross rent
Derived ACS ratios for market context — not a proprietary cost-of-living index or lender qualification standard.
Units-in-structure mix from ACS — shares of total housing units, not new construction pipeline.
Lifestyle & investment
Families
- Household incomes support a relatively affluent profile
- Neighborhood amenities and lot hazards still decide fit
- Confirm attendance boundaries on the specific APN
Retirees
- Housing stock centered around 1966 — maintenance needs vary
- Walkability and healthcare access differ street to street
- Review HOA rules, insurance, and parcel hazards before buying
Investors
- Owner-heavy markets still need local rental comps
- ACS median gross rent about $2,922/mo
- Zoning, ADU rules, and insurance drive outcomes more than ACS averages
Builders
- Mountain and coastal lots frequently need slide, grade, and WUI diligence
- Verify zoning, setbacks, and utility access early
- Geotechnical and grading reviews are common on hillside lots
Terrain & geography
San Mateo County spans bay flats, Peninsula valleys, and Santa Cruz Mountains. Coastal and mountain parcels are steep; bayshore cities sit on gentler fill and alluvium.
Elevation Sea level to about 2,600+ ft in the Santa Cruz Mountains
01San Francisco Bay shorelineSan Francisco Bay shoreline flats and fill
02Peninsula valley floorsPeninsula valley floors
03Santa Cruz Mountains ridgesSanta Cruz Mountains ridges and redwood canyons
04Pacific coastal bluffsPacific coastal bluffs and terraces
Development checklist
- Slope and grading feasibility
- Flood exposure and drainage
- Wildfire / WUI hazard
- Liquefaction and geology where mapped
- Zoning, setbacks, and overlays
- Utility access (water, sewer/septic, power)
- Geotechnical conditions on hillside or fill lots
Screen slope and elevation on the APN in Parcel View, then confirm grading, driveway grades, and pad feasibility with San Mateo County planning and a licensed surveyor/engineer.
Key takeaways
- Housing prices in San Mateo County sit well above the California ACS median.
- Terrain shifts across several landscapes — from san francisco bay shoreline to pacific coastal bluffs.
- Parcel-specific screening for zoning, flood, wildfire, soils, and slope matters more than any countywide average.
Public GIS, assessor records, and San Mateo County planning information help buyers, investors, REALTORS®, and developers evaluate parcels before calling the planner.
What Parcel View checks in San Mateo County
🏛 Zoning & general plan
Reference zoning district and general plan land use from statewide LCI layers and San Mateo County planning data, so you can see how a lot is designated before you call the planner.
🌊 FEMA flood
FEMA National Flood Hazard Layer zones across the parcel, flagging Special Flood Hazard Areas that drive insurance and building requirements.
🔥 Wildfire hazard
CAL FIRE Fire Hazard Severity Zones and WUI context — critical across much of San Mateo County for insurance and defensible-space rules.
🌳 Soils
USDA SSURGO soil map units for a first look at septic suitability, drainage, and grading constraints.
⛰ Slope & topography
Screen slope and elevation on the APN in Parcel View, then confirm grading, driveway grades, and pad feasibility with San Mateo County planning and a licensed surveyor/engineer.
🪨 Geology & seismic
Mapped liquefaction, fault, and landslide layers where the state publishes them.
San Mateo County hazard & zoning screens
Official San Mateo County sources
Parcel View reads public GIS — it does not replace the county. Every screening links to the controlling source, and these are the authorities for San Mateo County:
- San Mateo County Planning Department ↗ — zoning, general plan, and permit rules that control any screening result.
- San Mateo County Assessor ↗ — parcel numbers, ownership, and lot records.
- FEMA National Flood Hazard Layer ↗ — official flood zones and base flood elevations.
- CAL FIRE Fire Hazard Severity Zones ↗ — state wildfire hazard mapping.
- USDA NRCS Web Soil Survey ↗ — SSURGO soils for septic and grading feasibility.
People also ask about San Mateo County parcels
How do I check zoning on a San Mateo County parcel?
Screen the APN in Parcel View for a first-pass zoning/general-plan reference, then confirm the controlling district with San Mateo County planning. Overlays and specific plans can change what is allowed.
How do I check FEMA flood zones in San Mateo County?
Parcel View intersects the FEMA National Flood Hazard Layer with the parcel polygon. Verify Special Flood Hazard Areas and base flood elevations on the FEMA Map Service Center before financing or building.
How do I check wildfire hazard in San Mateo County?
Review CAL FIRE Fire Hazard Severity Zone context on the Parcel View screen, then confirm adopted maps with OSFM/CAL FIRE and ask San Mateo County planning how FHSZ or WUI rules affect your project.
Can Parcel View tell me if San Mateo County land is buildable?
No single map says “buildable.” Use Parcel View to flag zoning, flood, fire, soils, and geology constraints, then verify entitlements with San Mateo County planning and licensed professionals.