San Mateo County, California
Gutter cleaning, repair and new gutters in San Mateo, CA
Rain in San Mateo adds up to about 20 inches in a normal year, with about 4 days that bring an inch or more. The wettest season is winter (December to February), with about 12.0 inches; the driest is summer (June to August), with 0.2. That is about 12,200 gallons a year off each 1,000 square feet of roof, every drop of it through a gutter and a downspout.
Call (866) 228-6229 free call to a gutter contractor serving San MateoSan Mateo: rain and roofs
NOAA station USW00023234, 5 miBars to one scale; the longest is winter (December to February).
Counting days with an inch of rain or more, San Mateo sits near the middle of the 939 places in California on this site (4.1 a year). By the age of its homes it sits 169th oldest by median year built of the 938 places in California on this site (half built by 1964).
When to clean gutters in San Mateo
Frost is rare in San Mateo, and in many years there is none (NOAA normals). With no hard freeze to strip the trees, the fall cleaning follows the leaf drop itself; book it once the trees over the roof are bare, and plan a second visit in spring.
When to clean gutters explains how the trees over a roof change the schedule.
Gutter and downspout size for San Mateo rain
The short, hard downpour is what a gutter is sized for. In San Mateo the five-minute rain expected about once in ten years falls at 2.53 inches an hour (NOAA Atlas 14 Volume 6). At that rate one 2-by-3-inch downspout drains about 2,850 square feet of roof and one 3-by-4-inch downspout about 5,690, by the rule in the Copper Development Association’s design handbook. Try your own roof in the gutter and downspout calculator, which starts from this figure.
The houses in San Mateo
Half the homes in San Mateo were built by 1964, 72% before 1980 (ACS 2020–2024). Houses that age have often had their gutters replaced once already; if not, the original runs and the boards behind them deserve a close look. On a house built before 1978, replacing more than 20 square feet of painted fascia or trim falls under the EPA’s lead-safe rule, so ask whether the crew is certified.
51% of households own their home, and 41% of homes are detached houses, 10% townhouses. If an association maintains the exterior, the gutters may be its job rather than yours; check before calling.
Hiring in California
Licensing for gutter work differs from state to state; ask a contractor in San Mateo which license or registration they hold in California, and for proof of liability insurance. Hiring a gutter contractor
In California’s fire hazard severity zones, the 2025 Wildland-Urban Interface Code (in force January 1, 2026) requires gutters and downspouts of noncombustible material, and gutters fitted with an approved means to keep leaves and debris from collecting (section 504.4). (2025 California Wildland-Urban Interface Code, Chapter 5 (UpCodes))
Gutter work in San Mateo
With half the homes built by 1964, replacement gutters and the fascia behind them come up more often here than in newer suburbs. The line takes all of it: