Who Pays for a Mold or Pest Inspection — Buyer or Seller?

In most standard residential transactions, the buyer pays for specialty inspections including mold testing, radon testing, and general pest inspection. However, the question of who pays is less important than the question of when each type of inspection is warranted and what to do with the findings.

The General Rule on Inspection Costs

The buyer pays for the general home inspection — the $400 to $800 fee for a professional inspector to evaluate the property's condition. Specialty tests that fall outside the inspector's standard scope are also typically paid by the buyer, since they are part of the buyer's due diligence process.

That said, nothing in a standard purchase contract prevents you from negotiating who pays for specialty inspections. In a market where sellers are competing for buyers, or when the general inspection raises specific concerns, asking the seller to cover the cost of a follow-up test is reasonable. Whether they agree is a different matter.

Who Pays for a Mold Inspection?

Buyers almost always pay for mold testing when they request it. Mold testing by a certified industrial hygienist — which involves air sampling and surface sampling sent to a laboratory — runs between $300 and $700 for a standard residential property.

A professional home inspection is not the same as mold testing. The inspector will note visible mold growth, visible water damage, musty odors, and conditions that favor mold growth. But an inspector is not a certified mold assessor, and their observation that mold is present does not tell you what species it is, how extensive the contamination is, or whether the air quality has been affected.

When does mold testing make sense? The most straightforward answer is when the general inspector flags active moisture intrusion, visible mold, or a persistent musty smell that you cannot attribute to a specific source. At that point, you have a documented concern in the inspection report, and requesting either a seller credit for remediation or a mold assessment before you commit further is a reasonable position.

If visible mold is already documented in the inspection report, some buyers skip the formal assessment and go straight to requesting a remediation credit. The logic is that the assessment itself costs money, and the remediation estimate from a licensed contractor gives you more useful information for negotiating. Either approach is defensible depending on the extent of the visible contamination.

When a seller might pay. If mold was a known condition that was not disclosed, and the inspection reveals it, you have grounds to ask the seller to cover both the testing and the remediation costs — potentially as a condition of keeping the contract alive. This is a different scenario from routine mold testing.

Who Pays for a Pest Inspection?

Pest inspection practice varies significantly by region and loan type.

In the Southeast, South, and West where termite activity is most prevalent, pest inspections are a standard part of most transactions. In many of these markets, the seller historically paid for the pest inspection — particularly in VA loan transactions, where a termite clearance letter from a licensed pest inspector is a lender requirement. Some states codify this as a convention rather than a rule, but it is worth knowing the practice in your specific market.

For conventional and FHA loans, there is no automatic requirement for a pest inspection, and who pays is a matter of negotiation or contract custom. Buyers who are purchasing older homes — particularly in regions with high termite, powder post beetle, or wood-boring insect activity — should treat the pest inspection as a worthwhile out-of-pocket expense regardless of who customarily pays.

A standard visual termite inspection (WDO report — Wood Destroying Organisms) costs $75 to $150. If the inspector finds active activity or prior damage, the treatment and repair estimates are what matter for negotiation.

Radon: What Buyers Need to Know

Radon is a naturally occurring radioactive gas that seeps into homes from soil. The EPA action threshold is 4.0 pCi/L — above that level, mitigation is recommended. Testing is the only way to know; radon is invisible and odorless.

Most inspectors offer radon testing as an add-on for $100 to $150 with results in 48 hours. The EPA's radon zone map identifies areas of highest risk, including much of the Midwest and parts of Pennsylvania, Ohio, and Colorado — but any home with a basement warrants testing regardless of zone.

When levels exceed the threshold, mitigation involves a sub-slab depressurization system that costs $1,200 to $2,500. Sellers will often credit this cost, as elevated radon is a health issue that can derail the sale.

Do Home Inspectors Check for Lead Pipes?

Inspectors will note the material of visible supply lines. The primary risk is in the service line running underground from the street to the house — which is not visible during a standard inspection. For homes built before 1940 in urban areas, ask the local water utility about service line material. A water quality test ($30 to $50 kit) provides useful baseline data.

Building the Right Inspection Package

The specialty inspections worth ordering alongside a general inspection depend on the property:

• Any home with a basement in radon-prone geography — add radon testing
• Any home built before 1980 with a basement or wet area that smells musty — flag for potential mold assessment
• Any home in the South, Southeast, or Pacific Coast — WDO pest inspection
• Any home built before 1980 — ask for a sewer scope
• Any home built before 1940 in an urban area — ask about lead service line status

The combined cost of a general inspection plus targeted specialty tests is $600 to $1,200 in most markets. On a $400,000 house, that is less than 0.3% of the purchase price — and each specialty test addresses a category of defect that can cost multiple times its price to repair after you own the home.

The Home Inspection Checklist at firsthometoolkit.com/home-inspection-checklist/ includes guides for identifying hazardous pipe materials, panel brands, and environmental concerns — organized by severity so you know which findings require specialist follow-up and which ones you can negotiate directly.