If you’ve started the home buying or selling process in Maryland, you’ve probably come across the term “WDI inspection” somewhere in your loan paperwork or contract addendums — and if you’re not in real estate or pest control, it can sound confusing. WDI stands for Wood Destroying Insect, and this specific inspection is one of the most commonly required — and most commonly misunderstood — parts of a Maryland real estate transaction.
This guide breaks down exactly what a WDI inspection covers, how much it typically costs in Maryland, who pays for it, and why it matters just as much as your general home inspection.
What Is a WDI Inspection?
A WDI inspection is a focused visual assessment of a property to identify evidence of wood-destroying insects — primarily termites, but also carpenter ants, carpenter bees, and reinfesting wood-boring beetles. Unlike a general home inspection, which looks broadly at structural, electrical, plumbing, and mechanical systems, a WDI inspection is narrowly focused on one thing: whether insects are actively damaging, or have previously damaged, the wood components of a structure.
The results of a WDI inspection are documented on a standardized form called the NPMA-33, published by the National Pest Management Association. This form is required for any HUD or VA-guaranteed property transaction and is also the industry-standard document used in most conventional home sales across Maryland. It’s often informally referred to as a “termite letter” or “termite report.”
If you’re already scheduling a termite inspection as part of your closing process, that inspection and the WDI report are typically one and the same — the NPMA-33 is simply the official paperwork that documents the findings.
What Does a WDI Inspector Look For?
During a WDI inspection, a licensed inspector performs a visual examination of all accessible areas of the home, including:
- Foundation walls and sill plates — common entry points for subterranean termites
- Crawl spaces and basements — where moisture and wood-to-soil contact create ideal conditions for infestation
- Exterior siding, decks, and porches attached to the structure
- Attic framing and roof structure, where carpenter ants and wood-boring beetles sometimes nest
- Areas of visible wood damage, such as hollow-sounding wood, blistered flooring, or discarded insect wings
Common wood-destroying insects found in Maryland include Eastern subterranean termites (the most prevalent in the mid-Atlantic region), carpenter ants, carpenter bees, and occasionally powderpost beetles. The inspector notes whether there’s visible evidence of active infestation, evidence of past damage with no current activity, or no evidence at all — each of which is reported differently on the NPMA-33 form.
It’s worth noting that a WDI inspection is a visual inspection. It doesn’t involve tearing into walls or drilling into framing, so it’s possible for hidden damage in inaccessible areas to go undetected. This is one reason experienced inspectors, like our team at DeepSeek Home Inspections, pay close attention to secondary indicators — moisture staining, mud tubes, and sagging wood — that often point to a larger issue than what’s immediately visible.
How Much Does a WDI Inspection Cost in Maryland?
WDI inspection costs in Maryland typically fall in the $75 to $175 range when bundled with a general home inspection, and can run higher — sometimes $250 or more — when ordered as a completely standalone service. A few factors that influence the price:
- Bundling with a home inspection. Most Maryland home inspection companies, including DeepSeek Home Inspections, offer WDI/NPMA-33 reporting as an add-on to a general home inspection at a reduced rate, since the inspector is already walking the property.
- Property size and accessibility. Homes with large crawl spaces, multiple outbuildings, or difficult-to-access foundations may take longer to inspect thoroughly.
- Standalone vs. combined service. A standalone WDI inspection, ordered without any other inspection, generally costs more per visit because there’s no shared travel or scheduling efficiency.
- Follow-up treatment consultations, if active infestation is found, are typically billed separately by a licensed pest control company rather than the home inspector.
Because WDI inspection pricing can vary company to company, the most reliable way to get an accurate number for your property is to request a quote directly through our scheduling page.
Who Pays for a WDI Inspection in Maryland?
In most Maryland transactions, the buyer orders and pays for the WDI inspection as part of their due diligence, similar to how they’d order a general home inspection or radon test. However, there are a few important exceptions:
- VA loans have specific rules around who can pay for the WDI inspection. In most cases, the buyer is not permitted to pay for it directly, and the seller (or another approved party) must cover the cost, with an invoice required as proof of payment.
- FHA loans typically require the buyer to cover WDI inspection costs if the appraisal flags visible evidence of wood-destroying pests, though this is sometimes negotiated between buyer and seller.
- Negotiated contracts may shift the cost to either party regardless of loan type, depending on what’s written into the purchase agreement.
If you’re unsure who’s responsible for the cost on your specific transaction, your real estate agent or lender can clarify based on your loan type and contract terms.
Is a WDI Inspection Required in Maryland?
Maryland doesn’t have a blanket statewide law requiring a WDI inspection for every home sale, but in practice, it’s required far more often than not:
- VA and FHA-guaranteed loans require an NPMA-33 WDI inspection before closing.
- Most conventional lenders request one as part of standard underwriting, especially for homes with basements, crawl spaces, or older construction.
- Many purchase contracts written by Maryland real estate agents include a WDI inspection contingency by default, regardless of loan type.
Even when it isn’t strictly required, ordering a WDI inspection is one of the more cost-effective ways to protect a significant investment. Subterranean termites cause billions of dollars in property damage across the U.S. each year, and an active infestation can go completely unnoticed by an untrained eye for years before real structural damage becomes apparent.
Why Termite Risk Is Especially High in Maryland
Maryland’s climate and soil conditions make it a particularly active region for subterranean termites, which are the most common wood-destroying insect found during WDI inspections statewide. A few reasons Maryland homeowners face elevated risk:
- Humid summers and moderate winters create ideal underground conditions for termite colonies to remain active for most of the year rather than going fully dormant.
- Older housing stock in many Maryland neighborhoods means original wood framing, sill plates, and foundation elements have had decades of potential exposure.
- Wood-to-soil contact, common in older decks, porches, and additions, gives subterranean termites a direct pathway into a structure without needing to build visible mud tubes first.
- Dense tree cover and mulched landscaping, both common throughout Maryland suburbs, can attract termite activity close to a home’s foundation.
None of this means every Maryland home has an active infestation, but it does explain why WDI inspections are treated as close to mandatory in practice, even in transactions where they aren’t strictly required by loan type. A colony can cause meaningful structural damage well before any visible warning signs appear above ground, which is exactly why a trained inspector’s eye matters more than a quick homeowner walkthrough.
WDI Inspection vs. General Home Inspection: What’s the Difference?
It’s a common misconception that a general home inspection automatically covers wood-destroying insects. It doesn’t — at least not to the level of detail a certified WDI inspection provides. Here’s how the two differ:
| General Home Inspection | WDI Inspection | |
|---|---|---|
| Scope | Structural, electrical, plumbing, HVAC, roofing, and more | Focused solely on wood-destroying insects and related damage |
| Report format | Custom inspection report | Standardized NPMA-33 form |
| Required by lenders? | Recommended, not usually required | Often required for VA/FHA loans |
| Ideal timing | Early in the inspection contingency period | Same visit as home inspection, when possible |
Because the two inspections complement each other so directly, most Maryland buyers schedule them together. If your inspector notices signs of wood damage during a general walkthrough, a proper WDI inspection with NPMA-33 documentation gives you (and your lender) the formal paperwork needed to move forward with confidence — or to negotiate repairs before closing.
What Happens If Wood-Destroying Insects Are Found?
If your WDI inspection turns up evidence of active infestation or past damage, it doesn’t automatically derail your transaction. Here’s typically what happens next:
- The inspector documents the findings on the NPMA-33 report, noting the location, type of evidence, and whether a treatment recommendation applies.
- A licensed pest control company — a separate provider from your home inspector — is usually brought in to assess the extent of the issue and provide a treatment quote if active insects are present.
- Buyer and seller negotiate who covers treatment costs, and whether any structural repairs uncovered by the inspection need to be addressed before closing.
In many cases, wood-destroying insect issues are localized and treatable without derailing the sale. Structural repairs are less common but do happen with long-neglected infestations, which is exactly why catching the issue early, before you’re locked into a closing date, matters so much.
Scheduling a WDI Inspection with DeepSeek Home Inspections
At DeepSeek Home Inspections, WDI reporting follows the same straightforward process as the rest of our inspection services:
- Schedule your inspection online or by phone, ideally alongside your general home inspection to save time and cost.
- Our certified inspectors perform a thorough visual assessment of accessible areas, following NPMA-33 reporting standards.
- You receive a clear report documenting any visible evidence of wood-destroying insects, along with photos and next-step recommendations if anything is found.
We proudly serve buyers, sellers, and real estate professionals throughout Maryland, including Howard County, Montgomery County, Anne Arundel County, Frederick County, Prince George’s County, and Baltimore County, along with communities like Waldorf, Odenton, Crofton, and Clarksburg.
Frequently Asked Questions About WDI Inspections in Maryland
What does WDI stand for in a home inspection? WDI stands for Wood Destroying Insect. A WDI inspection specifically checks for evidence of termites, carpenter ants, carpenter bees, and wood-boring beetles, and the results are documented on the standardized NPMA-33 form.
Is a WDI inspection the same as a termite inspection? Yes, in practice. “WDI inspection,” “termite inspection,” and “termite letter” all refer to the same visual assessment and NPMA-33 report, even though wood-destroying insects technically include more than just termites.
How much does a WDI inspection cost in Maryland? Most WDI inspections in Maryland cost between $75 and $175 when bundled with a general home inspection, and can run higher as a standalone service.
Who pays for the WDI inspection, the buyer or the seller? It varies by loan type and contract. Buyers typically pay in conventional transactions, but VA loans generally prohibit the buyer from paying directly, shifting that cost to the seller.
Do I need a WDI inspection if I’m not using a VA or FHA loan? It isn’t always legally required for conventional loans, but most lenders and real estate agents still recommend it given how much structural damage termites can cause undetected.
How long does a WDI inspection take? A WDI inspection typically takes 30 minutes to an hour on its own, or can be completed during the same visit as a general home inspection with minimal added time.
Schedule Your WDI Inspection in Maryland Today
A WDI inspection is a small line item compared to the cost of undetected termite or wood-boring insect damage. Whether you’re closing on a purchase, preparing to list your home, or simply want peace of mind about your property’s condition, our certified team is ready to help.
Browse our inspector profiles, check our FAQs for more common inspection questions, or contact us with questions specific to your property.
Ready to book? Schedule your WDI inspection today or call us at (667) 254-8886.
Because WDI inspection pricing can vary company to company, the most reliable way to get an accurate number for your property is to request a quote directly through our scheduling page.
