The short version
Most termite problems in Sunnyvale are western subterranean termites, and the usual fix is a liquid soil treatment or bait stations. Drywood termites need fumigation or wood treatment instead. Start with an inspection; $75–$250 is typical.
- Look for mud tubes, shed wings and hollow-sounding wood.
- Swarms usually show up in spring.
- Drywood termites need wood treatment or fumigation instead.
- An inspection typically costs $75–$250.
- Insurance usually doesn’t cover termite damage.
Homeowners, landlords and anyone buying or selling a house in Sunnyvale, whether you've spotted something or just want to know what to watch for.
What to look for
Termites work quietly. A colony can feed inside a wall for years. Winters around Sunnyvale stay mild, with average lows near 43°F, so colonies keep feeding all year. Spongy floors or bubbling paint usually mean long-running damage. So it's worth an inspection, even for one or two signs.
- 1Small kick-out holes in exposed wood.
- 2Buckling laminate or warped hardwood flooring.
- 3Screwdriver sinks easily into sills or trim.
- 4Termite activity reported at a neighbor's home.
- 5Blistered or bubbling paint on wood surfaces.
- 6Mud in cracks of subfloor or joists.
Why it’s worth acting soon
- Colonies grow and spread every year they go untreated.
- Damage hides behind drywall, flooring and trim.
- Homeowners insurance usually doesn’t cover termite damage.
- An active infestation can complicate a home sale.
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Termite activity through the year in Sunnyvale
Spring
swarm seasons. For Sunnyvale homes, swarms often follow the first warm days and the first fall rain.
Summer
with highs around 80°F in Sunnyvale, termites follow moisture, so watch AC drain lines, sprinkler zones and hose bibs.
Fall
with about 16 inches of rain a year in Sunnyvale, make sure gutters and downspouts carry water well away from the foundation.
Winter
a good time to book an inspection in Sunnyvale, before swarm season starts.
Treatment options and typical costs
Termite Inspection and WDI Report
$75–$250
The inspector checks the foundation, garage, attic and damp spots. Bring up anything you’ve noticed.
- Time
- 60–120 minutes
- Best for
- Every job, real estate closings, and yearly peace of mind
Localized Wood, Foam, and Borate Treatment
$250–$1,500
Borate is brushed or sprayed onto bare wood in crawl spaces. Termites that eat treated wood around a Sunnyvale home die, and the protection lasts as long as the wood stays dry.
- Time
- 1–3 hours
- Best for
- Small drywood spots, wall voids, and exposed framing
Bait Station System with Monitoring
$1,500–$3,500 install, plus $300–$500 per year
Each station holds cellulose bait laced with a chitin synthesis inhibitor. Workers around a Sunnyvale home share it, cannot molt, and the colony dies over weeks to months.
- Time
- 2–4 hours to install; checked quarterly
- Best for
- Colony elimination, wells and slabs, homes near water
Liquid Soil Termiticide Barrier
$1,200–$3,500 (often $3–$16 per linear foot)
A liquid barrier treatment around a Sunnyvale home means trenching and rodding termiticide into the soil along the foundation. Non-repellent products let termites pass through and carry the chemical home to the colony under Sunnyvale.
- Time
- Half a day to a full day
- Best for
- Active subterranean termites; fast knockdown around the foundation
Prices are typical published ranges. Ask what’s included before you compare quotes.
In a basement, the wooden sill plate on top of the block wall is the first piece of wood termites reach.How treatment works on a typical Sunnyvale home.
They're spaced every 10 to 20 feet. Termites carry the bait back to the colony. The stations are checked on a schedule, often every few months. With a basement, the crew treats soil along the outside. Inside, they may drill where the floor meets the walls. Bait stations are the other main option.
Which termites live around Sunnyvale.
It needs steady moisture. Drywood termites are common around Sunnyvale as well, flying straight into attic framing, eaves and furniture without any soil contact. Look for tiny piles of pellets that look like coarse sand. The termite you're most likely to meet in Sunnyvale is the western subterranean termite. It nests in soil and builds mud tubes to reach wood.
Sealing the gap where pipes enter the house takes away one of the easiest routes in. It won't replace treatment, but it helps.When termites swarm here.
A swarm outside means a colony is nearby. A swarm inside usually means it's in the house. Save a few in a bag, or snap a clear photo. Swarm season is when termites show themselves. For Sunnyvale homes, western subterranean termites usually swarm in spring, and again in fall after the first good rain. Drywood termites around Sunnyvale tend to swarm in late summer and fall.
Where to look around your house.
Outside, check porches, steps and decks that touch soil. Wood should stay several inches above the ground. The same advice applies across the area, from Sunnyvale out to San Jose and Fremont. Plenty of homes in Sunnyvale have basements, so check where the wood framing sits on top of the foundation wall. Look around window wells and unfinished walls.
A year of termites in Sunnyvale.
- Summer: with highs around 80°F in Sunnyvale, termites follow moisture, so watch AC drain lines, sprinkler zones and hose bibs. - Fall: with about 16 inches of rain a year in Sunnyvale, make sure gutters and downspouts carry water well away from the foundation. - Winter: a good time to book an inspection in Sunnyvale, before swarm season starts. - Spring and fall: swarm seasons. For Sunnyvale homes, swarms often follow the first warm days and the first fall rain.
What happens at an inspection.
They'll check the basement walls and sill plate. A moisture meter and a probe help them find hidden activity. Afterward, ask them to show you what they found. Photos help. Most inspections take an hour or two. The inspector walks the outside of the house first. They check the foundation, the soil line and nearby wood. Inside, they check the garage, baseboards, plumbing gaps and the attic.
Termites or ants?
- Waist: termites are thick through the middle. Ants are pinched. - Antennae: termite antennae are straight. Ant antennae bend like an elbow. - Debris: termites leave mud. Carpenter ants leave sawdust. - Tunnels: termite galleries are packed with mud. Ant tunnels are clean and smooth. - Wings: termite wings are all the same length. Ant wings aren’t.
Getting ready for treatment day.
Mark sprinkler heads and any buried lines. Keep pets and kids inside while the crew works outside. Ask how long to stay off treated soil. Any drill holes in a slab or patio get patched. Soil treatments and bait stations need little prep. Clear a path along the outside walls. Move stored boxes away from garage walls.
Mulch and termites.
A dry strip along the house lets you spot mud tubes. Wood chips right against siding hold moisture termites like. Keep mulch thin and pull it back from the foundation.
Questions to ask before you sign.
- What product or system will you use? - Is the whole foundation treated, or just one spot? - What does the warranty cover, and for how long? - What does the yearly renewal cost? - What do I need to do before and after treatment? - Which termites did you find, and where?
What affects the price
- Amount of drilling through concrete and patios.
- Attached garages, decks, and additions.
- Wells, drains, or water features limiting chemical use.
- Linear feet of foundation to be treated.
- Liquid barrier versus bait station system.
- Local labor rates and licensing requirements.
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What's your biggest concern about termites?
When to call for help
Call if you see mud tubes, pellets or an indoor swarm. Hollow-sounding wood is another clue. Buying or selling? Get a wood-destroying insect (WDI) report either way. Lenders often ask for one. It's also the cheapest termite service. Carpenter ants leave clean tunnels and sawdust. Termites leave mud.
What you can do yourself
Treating an active colony is harder. The product has to reach the whole colony. It also needs even coverage around the entire foundation. Store-bought sprays usually kill only the termites you see. Some of the work is yours. Pull mulch back from the foundation. Fix leaks and clear gutters. Keep firewood away from the house.
Termites in Sunnyvale
Sunnyvale only sees about 16 inches of rain a year, so local termites gather wherever water collects, like sprinkler zones, hose bibs and AC drain lines. Termite activity in California is above average. Most houses will see termites at some point. With summer highs around 80°F, Sunnyvale's mediterranean climate decides when local termites are busiest. A typical home in Sunnyvale is worth around $1,650k, which puts a few hundred dollars for an inspection and prevention in perspective. Sunnyvale has a mediterranean climate, and termites activity here tends to pick up spring swarm season (March-May), warmer earlier in the south. For Sunnyvale homes, most of the housing is urban, so the usual entry points, moisture spots, and sheltered areas near the structure are what an inspection checks first. For Sunnyvale homes, take a minute to note where you have seen activity and when it appears, so the inspection is faster and the quote more accurate. A local provider who knows Sunnyvale and California can point out the specific conditions that matter most here before you commit to a plan.
Local research
Termites in Sunnyvale, CA: what the public record shows
Before you compare quotes, it helps to know which termites actually live in California, when they are busiest around Sunnyvale, and what the state figures look like. Everything below links to the agency or university page it came from.
Termite control products for drywood termites
Drywood and subterranean termite work in California is effectively professional-only; the state licenses it by branch.
UC Statewide IPM ProgramTermite species recorded in California
- Formosan subterranean termite (Coptotermes formosanus) — FDACS lists it in Florida, Alabama, Georgia, Louisiana, Mississippi, South Carolina, North Carolina, Tennessee, Virginia, Texas, Arizona, California and Hawaii. Colonies contain…
- Western drywood termite (Incisitermes minor) — UC IPM: 'California's second most important termite pest', 'commonly found along the Pacific coastal region extending into the Central Valley and deserts of Southern California'…
- Desert subterranean termite (Heterotermes aureus) — UA Extension calls it an 'important structural pest' of the desert Southwest. UC IPM: 'flies in the late afternoon or early evening in July, August, and September'.
- Western subterranean termite (Reticulitermes hesperus) — Oregon State: causes damage to structures in the Pacific Northwest and 'may swarm any time of year'. Utah State describes swarmers 3/8 inch long and workers 1/4–3/8 inch, pale c…
When termites are busiest around Sunnyvale
Reticulitermes swarm in the afternoon in spring or fall on clear days after a soaking rain; drywood swarmers fly in daytime during summer and fall; Heterotermes aureus flies late afternoon/early evening in July–September (UC IPM).
UC IPM: Reticulitermes 'can be encountered in nearly all regions of the state'; the western drywood termite is 'California's second most important termite pest', found along the Pacific coast, Central Valley and Southern California deserts. FDACS lists California among states with Formosan termites. Branch 3 covers 'the control of wood-destroying pests or organisms by the use of insecticides or structural repairs and corrections'; Branch 1 covers fumigation.
Rules that apply in California
Sources: Drywood Termites (Pest Notes); University of Georgia Extension; University of Missouri Extension; Formosan Termite Program; Not All Termites Are Terrible (Home and School IPM Newsletter); Termites | Solve Pest Problems. Figures are quoted as the source prints them. How we check our sources
Simple ways to keep termites away
- Trim shrubs so foundation walls stay visible and dry.
- Never leave form boards or scrap lumber in the soil.
- Install a vapor barrier over crawl space soil.
- Set deck and porch posts on concrete, not soil.
- Keep gutters clean so water does not pool.
- Paint or seal exposed exterior wood.
An inspection starts outside, with a flashlight along the foundation line where mud tubes show up first.Did you know?
Some African termite mounds stand more than 25 feet tall.
For Sunnyvale homes, soldier termites can't feed themselves, so the workers feed them mouth to mouth.
Questions people ask
Do I need a termite inspection when buying a house?
Usually, yes. Many lenders ask for a wood-destroying insect (WDI) report. Either way, it's cheap peace of mind. Ask your agent when it's due.
Is termite treatment safe for kids and pets?
Used according to the label, yes. Soil treatments stay in the ground. Bait stations are locked and buried. Ask for the label and follow any re-entry times.
Will termites come back after treatment?
They can. Treatments wear down and new colonies move in. That's what yearly inspections and renewal plans are for.
How long do termite bait stations take to work?
Usually several weeks to a few months. Termites have to find the stations first. Then the bait spreads through the colony.
Are mud tubes always a sign of active termites?
Not always. Old tubes can stay on a wall for years. Break off a piece and check back in a week. If it's rebuilt, they're active.
Can you treat for termites before building a house?
For Sunnyvale homes, termites are best caught early through inspection, because the damage is hidden inside wood until it is far along. For Sunnyvale homes, a professional inspection looks for mud tubes, damaged wood, and swarming activity, and treatment targets the soil and the colony rather than just the visible wood.
Are termites common in California?
Around Sunnyvale, the usual culprit is the western subterranean termite.
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Sources (11)
The facts in this article come from the public sources listed above. Every home is different, so ask the company you talk to about pricing and what’s included. Published by Termite Exterminator · Updated September 11, 2026 · How we write these guides