Legal Requirements for Homemade Trailers

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police-504811_960_720If you have decided to build your own trailer, it is important for your to be aware of the legal requirements involved in towing a homemade or unidentifiable trailer.

Today, we will discuss the legal requirements in Washington. It is important to understand that similar requirements are enforced in most states.

State patrols are authorized to inspect all homemade/unidentified trailers for licensing purposes.

According to the Washington State Patrol website, here are the documentation materials that must be presented at the time of inspection to show legal ownership of the trailer/parts used:

  • Documents presented at time of inspection must be original (this means that it is the first form or occurrence of something). Faxes or copies will not be accepted.
  • Bills of sale from private parties presented at time of inspection must be notarized (meaning: to certify a signature on a legal document by affixing a notary’s stamp and signature, verifying the identity of the seller signing the document).
  • All receipts/invoices for major component parts must be made out to you, the trailer owner, your immediate family member, or the licensed shop that built the trailer. Major component parts purchased from a third party require a notarized bill of sale from the original purchaser to you and the original parts receipts—or, in the case of a licensed business, a letterhead statement of transfer to you and the original parts receipts.
  • Any parts purchased from a licensed business must be presented with an ORIGINAL sales receipt/invoice. The receipt/invoice must show the name and address of the business, a description of the parts sold, the date of sale, and the purchase price.
  • Any parts purchased from a licensed vehicle wrecker must be presented with an original sales receipt/invoice to include the wrecking yard name and address, a description of the parts sold, the date of sale, the amount of sale, and the stock number and/or VIN of the vehicle the parts came from.
  • Any vehicle/parts purchased/given/traded from a private party must be presented with a signed and released title to the vehicle the parts came off of, or a notarized bill of sale. The notarized bill of sale/gift/trade must include the name, address, phone number of the seller and purchaser, a description of the parts sold, vehicle information the parts came off of (to include year, make, model, VIN), the date of sale, and the purchase price.
  • Internet/Electronic receipts will ONLY be accepted for NEW AFTERMARKET MAJOR

For more information about homemade/Unidentifiable trailer requirements go to Or just do yourself a favor and just come in to Trailer Boss for a new trailer that will fit all of your needs.



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