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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 242 building permits in September 2026, down 17% from the prior month. The most active zip code was 94025 with 51 permits. Re-Roof was the top permit type, making up 18% of all permits issued.

Permits issued
242
vs. prior month
-17%
291 last month
Most active zip
94025
51 permits
Top permit type
Re-Roof
18% of total

Permit activity by zip code

Top 10 zip codes by permit volume — September 2026

94025
51
94062
41
94402
24
94063
18
94010
16
94061
15
94028
14
94038
14
94037
11
94019
7

Permits by type

September 2026 · San Mateo County, CA

Re-Roof
43 (18%)
Residential Addition / Alteration to Existing Residence
35 (14%)
Building Permit Revision
20 (8%)
Electrical Service Upgrade
17 (7%)
Auto Issue Permit
16 (7%)
Plumbing
16 (7%)
Landscaping / Retaining Wall
13 (5%)
HVAC, Furnace, Air Conditioning, and Heat Pump
11 (5%)
Kitchen / Bath Remodel
10 (4%)
Information Notice
8 (3%)
Water Heater
7 (3%)
Fire Systems
6 (2%)
Deck / Patio / Porch
4 (2%)
Electric Vehicle Charger
4 (2%)
Temporary Structure
4 (2%)
Window or Door
4 (2%)
Electric Generator
3 (1%)
PV Solar
3 (1%)
Residential New Single Family / Multi Family / Manufactured / Detached ADU
3 (1%)
Siding and Stucco
3 (1%)
Commercial Addition / Alteration / Tenant Improvement / Change of Occupancy or Use
2 (1%)
Demolition (Minor / Major / Pool)
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

August 2026July 2026
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