San Francisco County Service Area
San Francisco Termite Control — Victorian Homes & Modern Buildings
Drywood & Subterranean Termite Specialists · WDO Inspections · Real Estate Clearance
San Francisco is unlike any other termite market in California. The city's dense stock of Victorian and Edwardian row houses — many built between 1870 and 1915 using original old-growth redwood and fir framing — represents some of the most significant drywood termite habitat in the state. Generations of colony activity in that original framing, combined with the city's mild, foggy climate and the persistence of subterranean termites in wetter western neighborhoods, creates structural pest pressure that demands experienced, locally-informed management. 101 Exterminators brings SPCB-licensed expertise (License #9119) to San Francisco homeowners, property managers, and real estate professionals who need accurate WDO inspections and effective termite treatment.
Local Intelligence
Understanding San Francisco County
Effective pest control begins with understanding the specific conditions that drive pest activity in your area. Here is what shapes the pest landscape in San Francisco County.
Climate & Weather
San Francisco's climate is defined by marine influence — cool summers, mild winters, and persistent coastal fog. The western neighborhoods (Sunset, Richmond, Outer Sunset) receive the most fog and marine moisture, making them particularly active for subterranean termites. The eastern and southern neighborhoods (Mission, Noe Valley, Bernal Heights) are warmer and drier, with conditions that favor drywood termite activity. Year-round temperatures between 50–65°F support continuous termite colony growth without the winter dormancy seen in colder climates.
Housing Stock
San Francisco's housing stock is one of the oldest and most architecturally distinct in the western United States. The city's 1870s–1915 Victorian and Edwardian row houses — Painted Ladies, Italianates, Queen Annes, and flat-front Edwardians — were built with old-growth redwood and Douglas fir. That original framing has been in place for 100–150 years, giving drywood termite colonies ample time to establish and spread laterally through shared walls in row house construction. Post-1906 earthquake construction introduced balloon-frame and platform-frame buildings that have their own termite vulnerabilities. Mid-century Sunset and Richmond District homes (1940s–1960s) show subterranean termite pressure, particularly in crawl spaces.
Geography & Landscape
San Francisco's compact geography — 49 square miles — means termite pressure is dense and consistent across neighborhoods. The western fog belt (Sunset, Richmond, Parkside) maintains higher soil moisture favorable to subterranean termites. The central and eastern neighborhoods (Castro, Mission, SOMA, Noe Valley) are warmer and support drywood termite swarm activity in the May–October season. The city's row house construction — buildings sharing walls across entire blocks — means a single active colony can spread laterally across multiple structures without ever swarming to establish a new colony.
Pest Pressure
Drywood termites are the dominant structural pest in San Francisco's pre-1940 housing stock. The 1870s–1915 Victorian and Edwardian construction corridor — stretching from the Western Addition through the Mission, Castro, Noe Valley, and Haight-Ashbury — has the highest concentration of active drywood termite infestations in the city. Subterranean termites are particularly active in the fog-belt neighborhoods of the Sunset and Richmond Districts, where soil moisture remains high year-round. San Francisco's active real estate market — with one of the highest housing turnover rates in California — drives consistent demand for WDO (Wood-Destroying Organism) inspection reports and Section 1 and Section 2 clearance.
Most Active Species
Priority Pests in San Francisco County
These are the pests we see most frequently — and treat most effectively — in San Francisco County. Each one reflects the specific environmental conditions of this area.
What We Offer
All Services Available in San Francisco County
Every service we provide is available throughout San Francisco County. From termite inspections and fumigation to ongoing pest maintenance programs and crawl space services, we are your single point of contact for any pest challenge.
Why Local Expertise Matters
San Francisco termite work requires knowledge that goes beyond standard pest control practice. Row house fumigation requires coordination with adjacent property owners. The city's strict pesticide regulations affect which products can be used and how. Historic preservation considerations in landmark buildings constrain treatment options. Real estate WDO reports in San Francisco follow specific local conventions that affect how Section 1 and Section 2 findings are documented. Our technicians are trained on all of these local factors and hold SPCB License #9119. We bring 20+ years of structural pest experience to every San Francisco inspection and treatment.
Cities We Serve
Explore San Francisco County Service Areas
Each city in San Francisco County has its own pest dynamics shaped by local climate, housing stock, and geography. Select a city to see location-specific pest intelligence and services.
20+
Years Serving San Francisco County
A+
BBB Rating
4
Counties Covered
5★
Google Rating
Local Questions
San Francisco County Pest Control FAQs
How does termite treatment work in San Francisco row houses?
Row house fumigation (tenting) in San Francisco requires coordination with adjacent property owners since shared walls are common. For localized infestations, orange oil (XT-2000) and heat treatment are effective alternatives that don't require neighbor coordination. We assess each structure individually and recommend the most appropriate treatment method based on infestation extent, building configuration, and local regulations.
What is a WDO inspection and do I need one for a real estate transaction?
A WDO (Wood-Destroying Organism) inspection is a licensed inspection of a structure for evidence of termites, wood-boring beetles, and wood-decay fungi. In San Francisco, virtually all real estate transactions require a WDO report as part of the disclosure process. The report identifies Section 1 items (active infestations requiring immediate treatment) and Section 2 items (conditions conducive to future infestation). We provide SPCB-licensed WDO reports accepted by all Bay Area title companies and real estate agents.
Are San Francisco Victorians at higher risk for termites than newer buildings?
Yes — significantly. Homes built before 1940 with original old-growth redwood and fir framing have had 80–150 years of potential drywood termite exposure. Many of these structures have active multi-chamber colonies distributed throughout the framing. Newer construction uses pressure-treated wood and different building methods that reduce termite vulnerability. That said, any wood-frame structure in San Francisco can harbor termites, and we recommend inspections for all properties regardless of age.
How often should I get a termite inspection in San Francisco?
For pre-1940 Victorian and Edwardian homes, we recommend annual or biennial inspections. The combination of old framing, mild climate, and row house construction means colonies can spread laterally into adjacent units without obvious swarm evidence. For newer construction, every 2–3 years is appropriate. If you're buying or selling, a current WDO report (within 12 months) is standard practice for San Francisco transactions.
Serving San Francisco County
Free Pest Inspection in San Francisco County
CA licensed and insured. Written estimate before any work begins. Same-day response available for urgent pest situations.