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What is a Wood Destroying Insect (WDI) Inspection Report?

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The buying and selling of a house involves many steps, including obtaining a Wood Destroying Insect inspection report. Here are the details about WDI inspection reports and how you can get one for your house.

What are Wood Destroying Insects 

Termites, carpenter bugs, carpenter bees and wood-boring insects are common wood-destroying insects found in New York, New Jersey and Long Island.

These pest insects can cause structural damage worth thousands of dollars to a single home or building by tunneling through and feeding on wood.

What is a Wood Destroying Insect Report (WDI)?

A wood destroying organism inspection report (also abbreviated as WDI or WDIR) is a report detailing the findings of a comprehensive visual inspection of a home performed by a pest control company.

This inspection focuses on termites and wood-destroying insects. It also provides professional recommendations for treatment. The National Pest Management Association has prepared a standard report using form NPMA-33.

Because you want to be sure that the house you are considering investing in is in good condition, a WDIR inspection is essential. A WDI inspection can help you save thousands on potential damage from termites and other insects. A WDI report may be required in some cases to get a mortgage from a bank.

What does the Inspector look for?

Common wood-destroying insects that are found in New York, New Jersey and Long Island:

  • Termites Eastern subterranean termites can be found throughout the Northeast. They live underground and eat wood.
  • Carpenter Ants– Carpenter ants nest in damp or decaying wood that is often damaged by mold.
  • Carpenter Bees The Carpenter Bees Although they don’t eat wood themselves, they can cause damage to wooden structures by drilling holes and creating tunnels.
  • Wood Boring Beetles The eggs of wood-boring beetles are laid in cracks and holes made from wood. Over several years, their larvae slowly eat their way to the end.

Signs of wood-destroying insects

  • Insect specimens, live or dead
  • Shelter tubes or mud tubes
  • Tiny holes in wood (bore/exit holes)
  • Visible damage to wood or structures
  • Hollow, blistering, or darkening wood
  • Wood surfaces can be sanded or bubbling painted
  • Discarded termite-swarmer wings close to doors and windowsills
  • Frass or insect droppings

WDI inspections can only be done visually. This means the inspector will only inspect areas that are easily accessible and unobstructed from the outside and inside of your home. WDI inspections are not designed to open walls, floors, or ceilings.

What Does a WDI report Cost? And Who Pays?

The cost of a Wood Destroying Insect inspection report (WDI), can vary depending on how large and whereabouts the property is located, as well the level of experience of the inspector.

A WDI inspection by a certified inspector in New York should cost about $250

Please don’t settle for the cheapest option when it comes to WDI inspections.

Termites, which are wood-destroying insects, cause homeowners billions of dollars in damage each year in the United States. Incorrect or incomplete inspections can cost homeowners a lot more in the end.

According to the NPMA 33 form for WDI reports

The quality and accuracy of the WDI report will depend on who you hire.

You can have peace of mind knowing your home is protected from the destructive pests.

The WDI inspection report cost is negotiable. Unless the WDI report for mortgage purposes is required, most buyers will request and pay for an inspection. Buyers who live in areas where termites are a common problem will request the inspection as part the contract contingency.


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