Fumigation Certificate: Costs, Validity, and Clearance

A fumigation certificate is a document issued by a licensed pest control professional confirming that a property or shipment has been chemically treated to eliminate pests. Most people encounter one in two situations: closing on a home with a government-backed mortgage, where the lender wants proof the property is free of wood-destroying insects, and shipping goods internationally, where customs authorities require proof that wood packaging has been treated. The certificate records what was treated, which chemicals were used, and when the space or cargo was cleared.

When You Need One to Buy or Sell a Home

If you’re using a VA or FHA loan, a wood-destroying insect (WDI) inspection report is almost certainly part of your closing package. The VA requires a WDI inspection in roughly 35 states plus several territories, covering most of the country. States like Alaska, North Dakota, Oregon, and Washington are fully exempt, and a few others require inspections only in certain counties.¹ FHA follows a similar map, requiring an inspection when there’s evidence of active infestation, when state or local rules mandate it, when it’s customary to the area, or when the lender asks for one.²

Both loan programs accept the NPMA-33, a standardized Wood Destroying Insect Inspection Report developed by the National Pest Management Association. The form captures the pest control company’s name and license number, the inspector’s credentials and signature, the property address, what was found (live insects, damage, frass, mud tubes), and any treatment recommendations. States with their own mandated inspection forms can use those instead.³ When a clear report is required, every structure on the property must be inspected and found free of active infestation before the loan closes.²

Conventional loans don’t always mandate WDI inspections, but individual lenders often require them in high-risk termite zones, and plenty of buyers order one anyway as basic due diligence. Finding termites doesn’t automatically kill the deal. Buyers and sellers typically negotiate who pays for treatment and repairs before closing moves forward.

When You Need One to Ship Internationally

International trade has its own layer of requirements built around stopping invasive species from riding along in wood packaging. The International Standard for Phytosanitary Measures No. 15 (ISPM 15) requires that pallets, crates, and dunnage be heat-treated or fumigated with methyl bromide, then stamped with an approved mark showing compliance.⁴ The stamp on the wood is often enough on its own, but some countries and certain commodities also require a separate phytosanitary certificate issued by the exporter’s plant protection agency.

Wood packaging that arrives in the United States without the ISPM 15 mark is treated as non-compliant. U.S. Customs and Border Protection considers unmarked wood packaging to be untreated, and the only remedy under U.S. rules is re-export.⁵ USDA APHIS inspectors may issue an Emergency Action Notification requiring the importer to re-export, destroy the wood under APHIS supervision, or safeguard it through tarping or fumigation at the port.⁶ The importer pays either way. For a full commercial shipment, that can run into thousands of dollars before you count the delay.

What Belongs on the Certificate

Whether the certificate covers a house or a shipping container, the same core information shows up:

The pest control company’s legal name, address, and professional license number.
The inspector or technician’s name, license or certification number, and signature.
The address of the treated building, or the identification number of the container.
The specific fumigant used (sulfuryl fluoride for structural work, methyl bromide for commodities), plus dosage and exposure duration.
The target pest, such as drywood termites or powderpost beetles.
The relevant dates: inspection, treatment start and end, and clearance for reentry.
Findings, including any active infestation, observed damage, and areas the inspector couldn’t access.

The NPMA-33 captures all of this in a standardized format and also flags any obstructions or inaccessible areas the inspector couldn’t evaluate, which matters because hidden damage behind walls or under heavy insulation won’t appear on the report.³ Missing fields can send the certificate back during a lender’s review, so check that every section is complete before it lands in your closing file.

How Long the Certificate Stays Valid

For real estate closings, the NPMA-33 is considered invalid for mortgage and property transfer purposes if it isn’t used within 90 days of the inspection date. The form itself states this 90-day window “shall not be construed as a 90-day warranty.”³ If closing slips past that window, you’ll pay for a new inspection and a new report.

Conventional and USDA loans may accept reports up to 180 days old, while FHA and VA loans generally hold to the 90-day standard. Confirm the number with your lender before booking the inspection. Ordering too early is a common and avoidable way to pay for the same report twice.

What It Costs

A WDI inspection alone generally runs between $75 and $325, depending on the size and complexity of the property. The inspection produces the clearance report the lender needs. If the inspector finds active infestation and recommends full structural fumigation, that’s a much bigger number. Whole-house fumigation typically costs between $2,000 and $8,000, driven mainly by square footage, severity of the infestation, and regional pricing. Larger homes at the top of that range can exceed $8,000.

Who pays depends on the purchase agreement. In many markets, the seller covers treatment as part of delivering a pest-free property, but this is negotiable. Some contracts split it, and some assign it entirely to the buyer. If you’re the buyer, pin this down during contract negotiations, not at the closing table.

A Certificate Is Not a Warranty

This is where confusion costs people money. A fumigation certificate, or termite clearance letter, is a snapshot in time. It confirms the property showed no evidence of active wood-destroying insects on the date of inspection. It does not guarantee the home will still be termite-free next month. The NPMA-33 puts it plainly: the report “is not a guarantee or warranty as to the absence of wood destroying insects nor is it a structural integrity report.”³

Ongoing protection is a separate product. A termite bond is a contract with a pest control company that typically includes scheduled inspections, prevention treatments, and a retreatment guarantee if termites return. Some bonds also cover structural repair if damage occurs after treatment. Bonds carry annual renewal fees; the certificate is a one-time document tied to a specific inspection date.

Preparing Your Property for Fumigation

Structural fumigation with sulfuryl fluoride means the whole house gets sealed under tarps and filled with gas that kills everything inside it. Skipping preparation steps can cancel the treatment on the day, so the list is not optional.

Everyone leaves. All people, pets (including fish and reptiles), and houseplants have to be out of the structure before treatment starts. Neighbors should be told so they keep children and animals clear during treatment and aeration.⁷

Food and consumables need special handling. Anything you would eat, drink, or take into your body that isn’t in an original factory-sealed glass, plastic, or metal container has to leave the home or be double-bagged in Nylofume bags supplied by the fumigation company. That covers opened cereal boxes, opened spice jars, pet food, vitamins, tobacco, and medications. Cold and frozen items get double-bagged and stay in the refrigerator or freezer. Sealed manufacturer packaging in glass, plastic, or metal can stay put.

Other steps to expect:

Schedule a gas shutoff with your utility at least 48 hours before treatment, and a restoration appointment for afterward.
Extinguish pilot lights on water heaters, stoves, ovens, and dryers.
Open all cabinets, drawers, closets, and interior doors so the gas can reach every cavity.
Prune any plants or trees touching the exterior, and water the soil within 18 inches of the foundation.
Move vehicles several feet away from the structure to leave room for tarping.
Turn off timers, sprinklers, air conditioning, and electrical heating elements in computers, pianos, and pet habitats.

Clearance and Issuing the Certificate

Once the home is prepared, the crew seals the structure under specialized tarps and introduces the fumigant. The gas moves through walls, attic spaces, and floor cavities to reach pests wherever they’re hiding. This phase typically lasts one to three days depending on the size of the structure and the concentration used.

After treatment, the crew aerates the building on a schedule dictated by the pesticide label. Under federal law a pesticide label is legally binding, and using a registered pesticide in a way inconsistent with its labeling violates the Federal Insecticide, Fungicide, and Rodenticide Act.⁸⁹ For sulfuryl fluoride, minimum aeration times run from 12 to 24 hours depending on the initial concentration, with a full 24 hours required whenever the outside temperature falls below 40°F. The structure cannot be reoccupied until the certified operator measures sulfuryl fluoride at 1 part per million or below in each room.

Once those readings clear, the fumigation company prepares and issues the certificate. In a real estate transaction, it usually goes directly to the escrow officer or title company to satisfy the lender’s conditions before title transfers. For international shipping, the certificate goes to customs agents or freight forwarders to authorize the goods to move.

Falsification Is a Serious Offense

Faking a fumigation certificate is treated seriously in every jurisdiction. False records, fraudulent inspection reports, and misrepresented findings in connection with pest control licensing or treatment are typically classified as misdemeanors, with penalties that can include license revocation, substantial fines, and jail time. States handle this through their structural pest control boards, and the exact penalty varies. A falsified clearance letter on a property sale can also expose whoever signed it to civil liability for termite damage the buyer discovers later.

1
Department of Veterans Affairs. Local Requirements – VA Home Loans
2
U.S. Department of Housing and Urban Development. HUD HOC Reference Guide – Pest Control
3
U.S. Department of Housing and Urban Development. NPMA-33 Wood Destroying Insect Inspection Report
4
International Plant Protection Convention. International Standard for Phytosanitary Measures 15 – Regulation of Wood Packaging Material in International Trade
5
U.S. Customs and Border Protection. Import and Export Requirements for Wood Packaging Material into the United States
6
USDA APHIS. Import ISPM 15-Compliant Wood Packaging Material into the U.S.
7
National Pesticide Information Center. Structural Fumigation
8
US EPA. Introduction to Pesticide Labels
9
Office of the Law Revision Counsel. 7 USC 136j – Unlawful Acts