Everything a Southern California homeowner needs to know about termites in one place — the species, the signs, inspection, treatment, cost, and prevention.
If you own a home in Southern California, termites aren't a question of *if* so much as *when* — the coastal climate, older housing stock, and year-round activity make this one of the highest-pressure termite regions in the country. This guide pulls together everything you need to know in one place: which termites you're dealing with, how to spot them, how inspection and treatment work, what it costs, and how to prevent it. Each section links to a deeper post if you want to go further.
Why Southern California Is High-Pressure
Two things make the region tough on wood. The coastal marine-layer climate keeps humidity high enough to support year-round termite activity — there's no real off-season. And much of the housing stock is older, with decades of weathering on exterior wood. Together, that's close to ideal for termites, especially drywood termites.
The Two Species That Matter
Almost all local activity comes down to two types, and they behave very differently:
- Drywood termites live entirely inside the wood they eat — no soil contact needed. They infest attic framing, eaves, fascia, and window frames, and they announce themselves with frass (pellets) and swarmers. Our complete guide to drywood termites covers them in depth.
- Subterranean termites nest in the soil and build mud tubes to reach wood, driven by moisture. They can do faster, larger-scale damage where irrigation keeps the ground damp. See how subterranean termites destroy homes.
Not sure which you have? Drywood vs. subterranean termites covers telling them apart, since the treatment differs.
The Warning Signs
The most common signs a Southern California homeowner will see:
- Frass — small ridged pellets that reappear after cleanup (why you keep finding droppings)
- Swarmers and discarded wings near windows and lights
- Mud tubes on the foundation (what they mean)
- Blistered paint, hollow-sounding wood, kickout holes
Our full field guides — how to identify termite damage and 5 warning signs of a termite infestation — cover what to look for and where.
Inspection
Detection is the whole game, because termites feed hidden for years before signs show. An inspection is a systematic, whole-structure check plus a written report — see what a termite inspection includes. Most homeowners should get one annually (how often), and any home sale triggers a formal WDO report.
Treatment
The right treatment depends on the species, the extent, and how accessible the activity is. The main options:
- Whole-structure: tent fumigation (reaches everything, ~3 days out) and heat (chemical-free, same-day)
- Localized: orange oil and spot treatment for confined, accessible activity
- Subterranean: Termidor soil barrier
- Preventive: borate (Bora-Care) on exposed framing
Our treatment overview and fumigation vs. no-tent breakdown cover how the method gets matched to the findings.
Cost
Termite treatment ranges from a few hundred dollars for a localized spot treatment to around $4,000 for a whole-structure fumigation, driven mostly by which method your findings require. Our Southern California cost guide breaks down every method and the factors behind the numbers.
Prevention
You can't make a home termite-proof, but you can lower the risk: control moisture, eliminate wood-to-soil contact, seal gaps, and keep up with inspections. What attracts termites and preventing termites in Southern California cover the full checklist. Just remember that drywood termites need none of those conditions — which is why inspection, not just prevention, is the reliable defense.
The Bottom Line
Termites are a normal part of owning a home in Southern California — and an entirely manageable one when you catch them early. Know the signs, inspect annually, and match treatment to the actual findings. The single best step is the simplest: a free inspection that tells you exactly where your home stands, with a written report and no obligation.