Seller Disclosure Requirements in New Hampshire (2026)

Quick answer: New Hampshire seller disclosure requirements are narrower than most sellers expect. State law (RSA 477:4-a through 4-h) requires written disclosure of your private water supply, sewage system and insulation, a flood-hazard-zone statement, and a signed radon, arsenic, lead, PFAS and flood notification. Federal law adds lead paint disclosure for pre-1978 homes. Everything else falls under "don't misrepresent," but the NHAR property disclosure form has become the practical standard.

Is New Hampshire a "buyer beware" state?

Mostly, yes. New Hampshire has no single all-purpose seller disclosure statute the way Massachusetts or Maine do. The rule of thumb is that a seller cannot lie, cannot actively hide a defect, and must hand over the specific statutory disclosures below, but is not otherwise obligated to volunteer every flaw in the house. That is why nearly every listing agent in the state asks sellers to complete the New Hampshire Association of Realtors Seller's Property Disclosure form. The form itself is not required by statute; it is a professional standard that protects both sides and keeps deals from unravelling at inspection.

One more piece matters: your agent has a separate legal duty. Under RSA 331-A:25-b, a licensed real estate agent must disclose to a prospective buyer any material physical, regulatory, mechanical or on-site environmental condition they actually know about. So if you tell your listing agent about a wet basement, it gets disclosed. Full stop.

What are New Hampshire sellers legally required to disclose?

Here is the complete list of New Hampshire seller disclosure requirements as the statutes read in September 2026, all of which must be delivered before a purchase and sale agreement is signed:

Two details trip sellers up. First, if you do not know the answer to a water, septic or insulation question, RSA 477:4-c says you must say so in writing; leaving it blank is not an option. Second, the statute requires the disclosure prior to or during the preparation of the offer, not at closing. In practice your listing agent attaches the completed forms to the MLS listing so every buyer sees them before writing.

Do you have to disclose known defects when selling a house in NH?

Beyond the statutory list, New Hampshire has no law that says "disclose every known defect." But you can still be sued for fraud, negligent misrepresentation or concealment if you paint over water stains, answer a direct question falsely, or check "no known problems" on the NHAR form when you replaced a failed sump pump last spring. Courts treat the disclosure form as a written representation, so an honest "yes, and here is what we did about it" is far safer than a hopeful "no."

What happens if a seller fails to disclose in New Hampshire?

The remedy depends on what was missed. Skipping the RSA 477:4-a notification does not void the sale; the statute says so. But a false answer on the water, septic or property disclosure form can support a claim for the cost of repair, and in serious cases a buyer can seek rescission of the purchase. Realistically, most disputes surface earlier, when the buyer's inspector finds something the paperwork should have mentioned; the buyer renegotiates or walks, and your home returns to the market with a "back on market" flag.

That timing risk is bigger in 2026 than it was two years ago. NHAR counted 2,992 single-family homes for sale statewide in July 2026, up 15.6% year over year, with 2.7 months of supply and a record $580,000 median sale price. Buyers have more choice than they have had since 2020, so a mid-contract surprise is more likely to end a deal than to be absorbed.

How to complete the NH seller disclosure without hurting your sale

We handle disclosures for sellers across Bedford, Manchester and the rest of southern New Hampshire, and the pattern is consistent: prepared sellers close, surprised sellers renegotiate. Three habits make the difference.

Gather the paperwork before you list

Pull your most recent well-water test (or order one; NHDES recommends a standard analysis every three to five years), your last septic pumping receipt with the contractor's name, any radon test or mitigation records, and permits for additions, decks and finished basements. Dates and contractor names are exactly what RSA 477:4-c asks for, and having them ready turns a two-page worry into a ten-minute task.

Disclose the fix, not just the problem

Buyers rarely walk over a disclosed and repaired issue. They walk over surprises. On one of our recent transactions the inspection turned up a septic tank that needed full replacement; the system's service history had never been documented, so the failure landed on the buyer's inspector rather than on the disclosure form. A pumping record with the contractor's name would have surfaced the tank's age months earlier and let the seller price or repair on their own terms.

Let the disclosure inform your price

If your disclosure shows a 30-year-old septic system or an unmitigated radon result, price accordingly and say so in the listing remarks. In today's two-speed market, the homes drawing multiple offers are the ones with no unanswered questions. If you would like a second set of eyes on your disclosure package and a pricing strategy that accounts for it, request a free home valuation from The Phinney Team and we will walk through both.

New Hampshire seller disclosure checklist

• NHAR Seller's Property Disclosure form, every question answered or marked "unknown" in writing
• Water supply disclosure: system type, location, installation date, most recent test, any bad results
• Septic disclosure: type, tank size, age, location, last service date and contractor name
• Insulation type and location
• Flood-hazard-zone statement (check the FEMA map before you answer)
• RSA 477:4-a radon, arsenic, lead, PFAS and flood notification, signed by the buyer
• Federal lead paint disclosure and EPA pamphlet if built before 1978
• Condo resale certificate and association documents, if applicable
• Shoreland notice if within 250 feet of a lake, pond or river
• Copies of permits, warranties, and repair invoices you reference in the form

This article is general information about New Hampshire seller disclosure requirements, not legal advice. For questions about your specific property, consult a New Hampshire real estate attorney.

Related reading

• Deciding whether to repair a defect or disclose it? Our guide to what to fix before selling your NH home sorts the list into must-fix, pays-for-itself, and disclose-and-price.
• Wondering what the whole transaction costs? See our cost to sell a house in New Hampshire breakdown.
• Buyers will test for it, so know the rules first: radon testing in New Hampshire.
• Selling a home on septic? Read our New Hampshire septic inspection guide to see what the buyer's inspector will look for.
• Not sure how to answer the flood question? How to check whether your NH home is in a flood zone.

Selling in Bedford? Start with our Bedford, NH real estate guide, or see how The Phinney Team prepares a listing from disclosure through closing.

Frequently asked questions

Is a seller's disclosure form required in New Hampshire?

Not by statute. New Hampshire seller disclosure requirements cover specific written disclosures about water supply, septic, insulation, flood hazard zone and the radon, arsenic, lead, PFAS and flood notification, but the full NHAR Seller's Property Disclosure form is a Realtor practice standard rather than a legal mandate. Almost every listed home includes one because buyers and their agents expect it.

Do NH sellers have to disclose radon?

Sellers must give buyers the RSA 477:4-a radon notification and get a signed acknowledgment. The statute does not require you to test. If you have tested and know the result, or have a mitigation system, honest disclosure on the property form is the safe course, since misrepresenting a known condition can create liability.

When must the disclosures be delivered?

Before a purchase and sale contract is executed, and for the RSA 477:4-d water, septic, insulation and flood items, prior to or during preparation of the buyer's offer. Listing agents typically attach the signed forms to the MLS listing so buyers review them before writing.

Does a New Hampshire seller have to disclose a death in the house?

No. RSA 477:4-e says an owner or agent is not required to disclose that a property was the site of a homicide, other felony or suicide unless the buyer asks and the seller has actual knowledge. Buyers and sellers may negotiate different disclosure terms in the contract.

Can a buyer sue for non-disclosure in New Hampshire?

Yes, on theories such as fraud, negligent misrepresentation or concealment, particularly when a written disclosure form was answered falsely. Remedies can include repair costs or, in serious cases, rescission. Failing to deliver the RSA 477:4-a notification alone does not affect the validity of title.

What is new in New Hampshire disclosure law for 2025 and 2026?

Two 2024 amendments: RSA 477:4-d now requires sellers of one- to four-family homes to state whether the property is in a federally designated flood hazard zone (effective July 19, 2024), and RSA 477:4-a added a flood paragraph to the required notification effective January 1, 2025. Sources: RSA 477:4-a and EPA lead disclosure rules.