Buying a house comes with plenty of unfamiliar terms. “WDI” is one worth understanding before your inspection. It stands for wood-destroying insects, and the inspection looks for visible evidence of insects that can damage the wood in a building.
You may hear it called a termite inspection, but the scope is broader than termites alone. For a buyer, the useful result is a written record of what was observed, where it was found, and what needs attention next. My WDI inspection service includes a separate report on accessible conditions.
What does a WDI inspection cover?
The inspection concerns visible evidence of termites, carpenter ants, carpenter bees, and certain wood-boring beetles. Evidence can include insects, damaged wood, shelter tubes, insect parts, or other recognizable signs. The inspector considers what is accessible at the time of the visit and documents areas that could not be examined. The National Pest Management Association’s reporting guidance explains these categories and the distinction between visible evidence and a structural damage assessment.
That last distinction matters. A WDI report can identify insect-related concerns. Determining whether damaged framing still has adequate strength may require a separate evaluation by a Qualified Structural Professional.
Why a quick look around the house is not enough
A freshly painted room does not tell you much about the framing behind it. A tidy basement is easier to inspect than a packed one, but even a clear space has surfaces and connections that remain concealed.
Termites can remain hidden in the soil, their tunnels, or the wood they are feeding on. Homeowners may first notice them during a swarm or when work exposes damage. That is why the absence of insects flying around during a showing is not a useful substitute for an inspection. The EPA’s termite guidance describes common evidence and conditions that help termites reach a building.
As a buyer, you can make the visit more useful by asking for clear access to the basement, crawlspace entrance, garage, and other agreed inspection areas. Ask the seller to move stored items when appropriate. Avoid disturbing suspected insect evidence before the inspection; the location and condition may help explain what is happening.
Moisture and wood conditions deserve attention too
An insect finding can lead to a second practical question: what made that location attractive?
Carpenter ants excavate wood to make nesting spaces. A new colony often starts in moist or partially decayed wood, although nesting can also occur in existing dry cavities. Seeing an occasional ant indoors does not, by itself, establish where a nest is located. Rutgers Cooperative Extension explains why identification, nest location, and correction of moisture problems are part of an effective response.
For buyers, this means a recommendation about a plumbing leak or damp exterior trim may be relevant to the insect concern as well. Treating insects and correcting the condition that supported them are related tasks. Ask the appropriate contractor to explain both parts of the work.
What if the seller says the house was treated?
Ask for the paperwork. Useful records include the pest-management company’s name, treatment date, affected areas, subsequent inspections, and any current service agreement. If a warranty is mentioned, ask the provider to confirm its terms and whether it can transfer to a buyer.
A statement that the house was treated several years ago leaves several questions open. What was treated? Was the recommended follow-up completed? Were damaged materials evaluated or repaired? Is the agreement still active?
Bring available records to the inspection instead of relying on a verbal summary. Evidence of earlier activity and documentation of treatment both matter, but they answer different questions. I want you to understand what is visible now and what the available records establish about the property’s history.
How to read the result
Start with the findings, then read the access limitations and recommendations. If evidence was reported, identify the location and the recommended next step. If an area was inaccessible, ask whether access can be arranged before you make your purchase decision.
A report stating that no visible evidence was observed describes the inspection findings. It does not establish that every concealed cavity was clear. Likewise, a finding of past damage does not automatically tell you that insects are active today or how extensive concealed damage may be.
Keep each question with the professional who can answer it. A Licensed Pest Management Professional can assess treatment needs. A Qualified Structural Professional can evaluate structural concerns when warranted. Your agent and attorney can help you understand how the findings fit the transaction and its deadlines.
Does every buyer need the same paperwork?
Ask your lender or loan contact early whether a particular inspection form or timing requirement applies to your purchase. Tell me about that requirement when you schedule so I can confirm the requested service and documentation.
It is better to establish those details before the visit than discover afterward that someone needs a different form or an additional structure included. A detached garage or other outbuilding should be discussed as part of the agreed scope, rather than assumed to be covered.
A useful inspection leads to clearer next steps
Before your appointment, gather any treatment records, confirm access, and share questions about visible damage or lender requirements. Afterward, focus on the findings that need clarification, evaluation, or a written estimate.
At Rooney Home Inspections, I explain the visible conditions in plain language and identify the next step when something deserves attention. If WDI is not included in your booking, you can request it through your Client Portal or ask me about adding it to your inspection.