Termidor SC Termite Treatment: What It Is, How It Works, and What to Expect

By Andrea · August 2026

Termidor SC is the professional-grade liquid termiticide that pest-control companies use more than almost any other product for subterranean termite infestations. It's not available at big-box stores in its full-strength formulation — licensed applicators use it because it works differently from older barrier chemicals, and getting the application right matters. For a full picture of what professional liquid treatment costs and how it compares to other methods, the Termite Treatment Cost guide is the right starting point.

How Termidor SC Actually Works

Most older termiticides work as repellents — termites detect the treated zone and avoid it. Termidor SC uses fipronil as its active ingredient, which takes a non-repellent approach. Termites can't detect the treated soil, so they pass through it, pick up the chemical on their bodies, and carry it back to the colony. The transfer effect means workers that never contacted the treated zone directly can still be exposed through nestmates. That mechanism is why fipronil-based treatments tend to eliminate colonies rather than just redirecting them.

The trench-and-treat process involves digging a narrow trench around the foundation perimeter, applying the diluted termiticide at a specified volume per linear foot, and backfilling. Vertical drilling through concrete slabs or patios may also be required where soil access is blocked. Volume and concentration per linear foot are set by the product label — gaps in the treated zone leave entry points, which is the most common reason DIY attempts with consumer-grade products underperform.

What Termidor SC Treats — and What It Doesn't

Termidor SC targets subterranean termites — including the aggressive Formosan species — by intercepting their soil-foraging routes. It has no effect on drywood termites, which nest entirely inside wood. For a full breakdown of treatment options by termite type, see the Termite Control guide.

Professional Application vs. DIY: Why the Gap Is Larger Here

Termidor SC is classified as a restricted-use product in many states, meaning only licensed applicators can purchase and apply the full-strength formulation. Consumer products containing fipronil at lower concentrations exist, but they're not the same thing. Proper application requires calculating the correct dilution ratio, applying the right volume per linear foot of foundation, and drilling through concrete where needed — a continuous treated zone with no gaps. A licensed pro carries liability if the treatment fails; a homeowner DIYing with an undersized product does not have that fallback.

If you're exploring what's genuinely feasible without a license, the DIY termite treatment page covers which products and scenarios are realistic and where the limits are.

How Long Does Termidor SC Last?

Under typical soil conditions, a properly applied fipronil barrier can remain effective for up to 10 years, though real-world longevity depends on soil type, moisture, and whether any excavation or landscaping work disturbs the treated zone after application. Most pest-control companies that apply Termidor SC back the treatment with a warranty — annual inspections confirm the barrier is still intact and the colony hasn't re-established. That warranty structure is part of what you're paying for beyond the chemical itself.

What It Costs and How to Get an Accurate Number

Professional Termidor SC treatment is priced per linear foot of foundation — the same structure as other Liquid Termite Treatments. Total cost depends on your foundation perimeter, soil accessibility, whether drilling is needed, and what warranty or monitoring plan is included. There is no meaningful way to estimate your specific job from a range without an on-site inspection; prices vary by region, construction type, and company. Get at least three quotes from licensed local pest-control companies — and make sure the inspection happens before any quote is finalized.

For a rough sense of what professional treatment tends to run across methods and home sizes, the Termite Treatment Cost overview covers realistic ranges with the caveats that make those numbers useful rather than misleading.