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September 2026 Building Permits

Official permit data from San Mateo County — updated Mon, Wed & Fri from the county permitting office.

San Mateo County, CA issued 333 building permits in September 2026, up 14% from the prior month. The most active zip code was 94025 with 70 permits. Re-Roof was the top permit type, making up 16% of all permits issued.

Permits issued
333
vs. prior month
+14%
291 last month
Most active zip
94025
70 permits
Top permit type
Re-Roof
16% of total

Permit activity by zip code

Top 10 zip codes by permit volume — September 2026

94025
70
94062
59
94402
30
94061
23
94063
22
94010
20
94038
20
94028
16
94037
14
94015
13

Permits by type

September 2026 · San Mateo County, CA

Re-Roof
53 (16%)
Residential Addition / Alteration to Existing Residence
46 (14%)
Auto Issue Permit
32 (10%)
Building Permit Revision
29 (9%)
Electrical Service Upgrade
25 (8%)
Plumbing
19 (6%)
Landscaping / Retaining Wall
16 (5%)
HVAC, Furnace, Air Conditioning, and Heat Pump
15 (5%)
Kitchen / Bath Remodel
14 (4%)
Information Notice
10 (3%)
Water Heater
10 (3%)
Fire Systems
9 (3%)
Window or Door
9 (3%)
Residential New Single Family / Multi Family / Manufactured / Detached ADU
7 (2%)
Electric Vehicle Charger
6 (2%)
Deck / Patio / Porch
5 (2%)
Demolition (Minor / Major / Pool)
5 (2%)
Temporary Structure
4 (1%)
Electric Generator
3 (1%)
PV Solar
3 (1%)
Siding and Stucco
3 (1%)
Commercial Addition / Alteration / Tenant Improvement / Change of Occupancy or Use
2 (1%)
Energy Storage Systems
2 (1%)
Stop Work Notice
2 (1%)
Residential Detached Non-Habitable Accessory Structures
1 (0%)
Skylight
1 (0%)
Swimming Pool / Spa / Hot Tub / Pond
1 (0%)
Temporary Power Pole
1 (0%)

Other months — San Mateo County

November 2026October 2026August 2026
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