Denver Real Estate WDO Inspections: What Buyers, Sellers, and Agents Need to Know

By James Fiala, Owner — Environmental Pest Control Services, Denver CO · Published June 2, 2026 · Updated August 2, 2026

If you're under contract on a Front Range home and your lender just sent over a list of inspections, there's a good chance a WDO inspection is on it. Buyers, sellers, and agents all benefit from understanding what's about to happen and what's in the report.

Here's the plain-English version, from a Denver pest company that's been writing WDO reports for the Front Range market since 1985.

What WDO means

WDO stands for Wood Destroying Organism. The inspection covers anything alive (or recently alive) that damages wood in a structure:

• Subterranean termites — uncommon at Front Range elevation but present, especially in foothills with adjacent forest
• Drywood termites — rare in Colorado, more common on imports and recently relocated furniture
• Carpenter ants — common in foothill and older Denver homes
• Carpenter bees — boring into untreated cedar fascia, deck rails, and exposed beams
• Powderpost beetles — found occasionally in older homes with original framing
• Wood-decay fungi (dry rot, brown rot, white rot) — by far the most common Front Range finding

When a WDO inspection is required

It's almost always lender-triggered. The most common loan types requiring it:

• FHA loans (Federal Housing Administration)
• VA loans (Department of Veterans Affairs) — required on most Colorado properties
• USDA Rural Development loans — common in Front Range communities outside the immediate Denver metro
• Some conventional loans, depending on lender risk profile or property condition flags

Buyers also commonly request a WDO inspection as part of their general due diligence even when not lender-required, particularly on homes built before 1990, on homes with significant deferred maintenance, or on log/cedar/heavy-timber construction in the foothills.

What the inspection actually involves

A WDO inspection is a visual inspection of every accessible part of the structure, plus probing of any wood that looks suspect. Standard scope:

• Exterior foundation perimeter — full walk-around, probing at sill plates, deck ledgers, and visible framing
• Interior accessible areas — every room, basement, mechanical room
• Crawlspace if present and accessible — this is where we find the most evidence
• Attic if accessible — typically a head-up inspection from the access opening
• Garage including framing and any wood-to-soil contact
• Decks, porches, fences within five feet of the structure, exposed trim, fascia, and window sills

The inspector documents findings on the NPMA-33 form (also called the WDIIR — Wood Destroying Insect Inspection Report). That's the standardized national form lenders accept. It identifies what was found, where, and whether evidence is current/active or historical.

What we typically find on Front Range homes

Denver elevation and our dry climate work in your favor on the termite front — subterranean termite pressure here is significantly lower than Front Range buyers transplanting from Texas or the Southeast tend to assume. But that doesn't mean WDO reports come back clean.

Most common findings, by category

• Wood-decay fungi at deck-to-house junctions, around hose bibs, behind landscaping that traps moisture against siding — by far the #1 finding
• Carpenter ant evidence (frass, exit holes, or live workers) in older Denver homes with original wood trim, especially Curtis Park, Wash Park, Highlands, Capitol Hill, Cherry Creek bungalows
• Carpenter bee galleries in untreated cedar fascia and exposed beams — common in Highlands Ranch, Parker, Castle Rock newer construction
• Powderpost beetle exit holes in original framing or antique flooring of pre-1950 homes
• Subterranean termite mud tubes or damage — occasional in foothill homes adjacent to forest, very rare in metro proper

Timing during the Denver market season

Spring and summer (April through August) are peak season for Denver real estate transactions. Inspection slots fill quickly. Book your WDO inspection early in the contract period — same week you go under contract, ideally — so the report lands on the lender's desk well before the financing contingency expires.

Standard turnaround during peak season is 7 days from inspection to delivered report. Off-peak (November through February) it's typically 2-3 business days.

If the report comes back with findings

Findings don't kill deals — they direct them. Standard moves:

• Active termites or visible structural damage: buyer typically requests treatment by a licensed specialist and/or repair by qualified contractor as a condition of closing. Costs are negotiated between buyer and seller.
• Wood-decay fungi: seller usually addresses the moisture source (gutter, grading, leaking flashing) and replaces affected wood before re-inspection. Sometimes a re-inspection fee applies; sometimes the lender accepts contractor invoices in lieu.
• Carpenter ants or carpenter bees: treatment can usually be scheduled within a week. If structural wood needs replacement, that's a separate trade.
• Historical evidence with no active activity: typically annotated on the report and no further action required.

What sellers can do before listing

• Walk the exterior and check every spot where wood meets soil or where a deck attaches to the house — these are the WDO inspector's first stops
• Look at fascia, especially on south and west exposures, for soft spots or exit holes
• Check that gutters drain away from the foundation and that landscaping doesn't trap moisture against siding
• Get a pre-listing WDO inspection if your home is older or has any of the construction features above — finding issues before a buyer's inspector does gives you control over how to address them

Veteran or first-responder buyer? Mention it when you book — we offer 10% off the inspection fee.

Frequently Asked Questions

Looking for more? Read about termite inspection (wdo reports) or browse the full pest library.

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