Every general contractor, property manager and insurance carrier that pays you needs a W-9 on file before they cut the first check. Keeping a current one ready removes the most common reason a first payment sits in accounts payable.
New Hampshire jobs get the national baseline packet. Every field a building department needs is covered; state-specific attachments are being added market by market.
One page: what a New Hampshire building department checks on this document, and the attachments that most often hold up issuance.
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General guidance for New Hampshire contractors, not legal advice. Confirm requirements with the authority having jurisdiction before filing.