State guide
New Hampshire Mold Laws and Tenant Rights
New Hampshire's minimum housing standards provide a practical starting point for leaks, damp rooms, and other defects associated with mold. Identify the failed building condition and contact the appropriate local official. Keep the inspection route separate from any court or rent remedy you are considering.
Content updated: 2026-10-10
Legal sources reviewed: 2026-09-19
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Overview
New Hampshire requires third-party certification for paid residential mold assessments under RSA 310-A:189-b, but has no separate statewide rental mold-remediation deadline. However, mold issues in rental properties are addressed through the implied warranty of habitability and minimum housing standards established under RSA 48-A:14. Local health officers enforce these standards, and tenants have legal remedies available through RSA 540-A when landlords fail to maintain habitable conditions. Some municipalities, such as Manchester and Nashua, have adopted their own housing codes that may include additional requirements. [New Hampshire Law Library - Clean, Safe, and Livable Rentals (Habitability)]
These summaries describe statewide rules. Coverage, written notice, local ordinances, and the facts of your tenancy can change the available remedy. Read the cited conditions before withholding rent, deducting repairs, or ending a lease.
Depending on the facts, tenants may be able to withhold rent and terminate the lease if conditions become uninhabitable. New Hampshire regulates at least some mold work. Verify the required license type, project threshold, scope, and current status with NH Office of Professional Licensure and Certification; a private credential is not a substitute for a required license. New Hampshire agencies may publish mold guidance, but complaint handling often still depends on local code enforcement, written notice, and the remedies available under state landlord-tenant law.
New Hampshire Mold Law Quick Answers
These answers target the questions renters and property owners usually need first: repair timing, relocation, rent remedies, disclosure, reporting, and who pays for remediation.
How long does a landlord have to fix mold in New Hampshire?
No universal mold-specific repair deadline was confirmed for New Hampshire in the sources reviewed for this guide. Treat timing as notice-and-condition specific: document the mold and moisture source in writing, use the cited habitability or repair source, and get local code enforcement or legal aid advice before treating any deadline as fixed.
Can tenants withhold rent for mold in New Hampshire?
Tenants may withhold rent under limited conditions established by RSA 540:13-d. The tenant must: (1) give the landlord written notice of the violations while not behind in rent; (2) wait 14 days for the landlord to take corrective action; and (3) the premises must be in substantial violation of health and safety standards. However, this defense is only available in an action based on non-payment of rent, and is not available if the tenant owes the landlord the equivalent of one week's rent or more. Courts have held that rent withholding without a court order is risky, and tenants should seek legal advice before attempting this remedy.
Can mold require relocation or lease ending in New Hampshire?
Unclear as a standalone statewide mold relocation benefit in the sources reviewed for this guide. If mold or remediation makes the unit unsafe or unusable, New Hampshire tenants should look to the cited habitability, essential-services, condemnation, disaster, or lease-termination rules and ask legal aid whether rent abatement, substitute housing, temporary vacancy, or termination applies. Tenants may terminate a lease early without penalty if the rental unit is uninhabitable due to the landlord's failure to maintain the property. The tenant must provide written notice of the condition to the landlord and allow a reasonable time (generally 14 days) for repairs. If the landlord fails to remedy the violation, the tenant may terminate the lease and is entitled to a prorated refund of rent from the date of termination or the date the tenant moves out, whichever is later. If dangerous mold is present, the unit may be considered uninhabitable. The landlord may dispute the legitimacy of the uninhabitable conditions by filing a complaint with the District Court.
Who usually pays for remediation?
Responsibility depends on the lease, state and local law, the moisture source, notice, repair history, and each party's conduct. A landlord may be responsible for building leaks or failed systems; a tenant may be responsible for tenant-caused damage or an unreported spill, but labels like "housekeeping" do not settle the issue by themselves. New Hampshire regulates at least some mold work. Verify the required license type, project threshold, scope, and current status with NH Office of Professional Licensure and Certification; a private credential is not a substitute for a required license. Homeowners may also have repair or disaster-aid options listed in the assistance programs section below. Compare options in the DIY vs professional guide.
Does mold have to be disclosed?
New Hampshire disclosure disputes usually turn on broader property-condition, habitability, or misrepresentation rules unless a specific mold disclosure requirement applies to the transaction.
Where can mold be reported?
New Hampshire agencies may publish mold guidance, but complaint handling often still depends on local code enforcement, written notice, and the remedies available under state landlord-tenant law. Report urgent hazards promptly. For a routine repair complaint, include dated photos, your repair notice, and the response so far; ask the agency what else it needs. Check the local regulations section for city complaint paths where this guide has them.
What to Do About Mold in New Hampshire
Start here for practical next steps, then review your state-specific legal details below.
- Describe the water entry, failed ventilation, or damaged building surface when requesting a local housing inspection under New Hampshire's minimum standards.
- Save written inspection findings and the landlord's response, then review the specific notice and court requirements before changing rent payments.
- Ask the landlord to fix the underlying water or ventilation problem, not just paint over or bleach visible mold, because recurring moisture is usually the habitability issue.
- Do not simply stop paying rent; New Hampshire's rent remedy has conditions. Keep the rent money available and get local legal advice before withholding or escrowing any payment.
- If the landlord does not act, contact code enforcement, the health or housing agency, or legal aid instead of assuming repair and deduct is available.
- If anyone has asthma, immune compromise, severe symptoms, or a doctor has advised avoiding exposure, document that separately and ask legal aid about emergency remedies or reasonable accommodation options.
Decision Framework
A practical sequence for prioritizing cleanup, legal notices, and contractor escalation.
- Base the cleanup method on the water source, affected materials, extent, access, HVAC involvement, and other hazards. Porous materials may need removal rather than surface cleaning.
- Trace the moisture source with inspection and appropriate measurements. Humidity, bubbling paint, and odor are clues, not proof of a source or hidden extent.
- Confirm occupant and worker safety first: limit access when disturbance could spread debris, and use ventilation only when it will not spread contamination or create another hazard.
- Collect evidence before escalation: photos with dates, repair logs, and any prior notices.
- When evidence suggests broader building issues, use the state law guide before deciding on repair-and-deduct or other remedies.
New Hampshire Tenant Mold Rights
Start here if you rent and need the protections most likely to matter when mold, leaks, or water damage affect safe occupancy in New Hampshire.
Right to Habitable Premises
Tenants have the right to rental premises that meet the minimum health and safety standards established by RSA 48-A:14 or applicable local housing codes. This includes premises free from conditions that render the dwelling unsafe, unsanitary, or unfit for living.
[New Hampshire General Court - RSA 48-A:14 Minimum Standards Established]
Right to Request Repairs
Tenants have the right to request repairs in writing for any conditions that affect habitability. Landlords must respond to repair requests within 14 days of receiving written notice.
[New Hampshire General Court - RSA 48-A:14 Minimum Standards Established]
New Hampshire Landlord Responsibilities for Mold
These are the duties landlords are usually expected to meet once mold or the moisture source behind it has been reported.
Maintain Habitable Conditions
Landlords must maintain rental premises in a condition that meets the minimum standards of RSA 48-A:14 or applicable local housing codes. This includes ensuring premises are free from defective plumbing, electrical hazards, structural defects, pest infestations, and other conditions that render the dwelling unsafe or unsanitary.
[Justia - 2024 New Hampshire Revised Statutes Section 48-A:14]
Provide Adequate Heating
Landlords must provide heating facilities that are properly installed, safely maintained, and in good working condition, capable of maintaining at least 65 degrees Fahrenheit average temperature in all habitable rooms when outdoor temperatures are above 20 degrees Fahrenheit.
[New Hampshire General Court - RSA 48-A:14 Minimum Standards Established]
Can New Hampshire Tenants Withhold Rent or Break a Lease?
These are the remedies readers usually search for first. Availability often turns on written notice, timing, and whether the condition makes the unit unsafe or uninhabitable.
Rent Withholding
Limited Remedy: Tenants may withhold rent under limited conditions established by RSA 540:13-d. The tenant must: (1) give the landlord written notice of the violations while not behind in rent; (2) wait 14 days for the landlord to take corrective action; and (3) the premises must be in substantial violation of health and safety standards. However, this defense is only available in an action based on non-payment of rent, and is not available if the tenant owes the landlord the equivalent of one week's rent or more. Courts have held that rent withholding without a court order is risky, and tenants should seek legal advice before attempting this remedy.
Repair and Deduct
Not Generally Available: New Hampshire does not have a specific statute authorizing repair and deduct as a tenant remedy. While some interpretations suggest it may be available in limited circumstances, the legal status is unclear. If a landlord fails to make repairs after proper notice, tenants generally have the following options: sue for costs, seek a court order to force repairs, or terminate the rental agreement. Tenants should consult with an attorney before attempting to repair and deduct.
[New Hampshire General Court - RSA 48-A:14 Minimum Standards Established]
Breaking a Lease Due to Mold
Tenants may terminate a lease early without penalty if the rental unit is uninhabitable due to the landlord's failure to maintain the property. The tenant must provide written notice of the condition to the landlord and allow a reasonable time (generally 14 days) for repairs. If the landlord fails to remedy the violation, the tenant may terminate the lease and is entitled to a prorated refund of rent from the date of termination or the date the tenant moves out, whichever is later. If dangerous mold is present, the unit may be considered uninhabitable. The landlord may dispute the legitimacy of the uninhabitable conditions by filing a complaint with the District Court. [New Hampshire General Court - RSA 48-A:14 Minimum Standards Established]
Documentation and Escalation
Good records decide a lot of mold disputes. Build your paper trail before cleanup, complaints, temporary relocation, or rent-related decisions.
Mold and Moisture Checks in New Hampshire
Use the local weather context to plan inspections, then document the moisture actually present in the building. Outdoor climate does not establish indoor mold levels, health risk or legal responsibility.
Warmer seacoast and colder northern uplands
New Hampshire has cold, snowy winters and mild summers, with frequent passing storms. NOAA describes greater ocean moderation in the southeast and more severe cold in northern, western and higher-elevation areas. Those differences help frame a roof or thaw investigation without implying that all homes share the same moisture problem.
Source: NOAA NCEI — New Hampshire State Climate Summary (2022)
Keep a record through the next thaw or rain
Photograph recurring ceiling or lower-wall stains and note the outdoor conditions when they change. If windows collect moisture on cold days, also record indoor humidity and ventilation. Ask for the roof, drainage or plumbing defect to be identified before a contractor paints, insulates or closes the affected area.
Source: EPA — Household Moisture Investigation and Repair Guidance
Use the Health Officer Liaison Unit’s moisture guide
New Hampshire DHHS publishes a Mold and Moisture resource through its Health Officer Liaison Unit, with links to EPA and CDC guidance. Bring a dated account of the wet conditions and repair requests when asking about local help. A health-information resource does not itself establish a finding against a landlord.
Mold Professional Requirements in New Hampshire
Before you pay for testing or remediation, confirm whether New Hampshire requires licenses, certifications, or agency oversight for this work.
Residential Mold Assessment Certification
New Hampshire law (SB 125) requires persons providing paid residential mold assessment services to hold a valid national third-party certification meeting RSA 310-A:189-b. This includes conducting inspections, developing remediation protocols, and collecting mold samples for analysis. This requirement applies only to residential properties; commercial buildings have no such legal requirement.
Certifying body: National third-party certification meeting RSA 310-A:189-b
Source: NH Office of Professional Licensure and Certification
Regulatory Agency
NH Office of Professional Licensure and Certification
Phone: 603-271-2152
Penalties
Noncompliance is a violation for a natural person and a class B misdemeanor for any other person. Homeowners should verify valid national third-party mold-assessment certification before hiring.
Mold Legislation in New Hampshire
If you want the source material, start here. These enacted and pending bills show how New Hampshire handles mold, water damage, and related housing standards.
Enacted Laws
SB 125: Mold Assessment Certification Act
Status: Signed by Governor, July 6, 2015 (Chapter 208)
Requires persons providing residential mold assessment services for remuneration to hold a valid national third-party certification. Mold assessment includes inspections, investigations, surveys, and development of remediation protocols for residential dwellings. Exempts professionals whose primary contracted work is not mold assessment. Directs the Board of Home Inspectors to inform the public about the certification requirement.
Impact: Made New Hampshire one of the few states requiring third-party certification for residential mold assessors, increasing consumer protection for homeowners hiring mold professionals.
Expired, Vetoed, and Superseded
HB 1126: Repeal Mold Assessment Certification Requirement
Status: Killed by Senate on March 26, 2026 (Senate docket records a 3-0 committee recommendation)
Would have repealed the certification requirement for residential mold assessment services. Passed House on voice vote Feb 19, 2026, but Senate Executive Departments and Administration committee recommended "Inexpedient to Legislate" 3-0, and the full Senate killed the bill March 26, 2026.
Significance: The national third-party mold assessment certification requirement under SB 125 remains in effect.
HB 1143: Mold Remediation in Rental Housing
Status: Killed by House on February 19, 2026; committee recommended ITL 17-1 on February 3
Would establish requirements related to the remediation of mold in rental housing.
Significance: Did not create new statewide rental mold-remediation duties because the bill was defeated.
Implied Warranty of Habitability
This is the baseline rule many mold disputes rise or fall on when there is no stand-alone mold statute.
New Hampshire recognizes an implied warranty of habitability for all residential rentals. This warranty means that landlords must provide and maintain safe and habitable rental property, whether or not the lease agreement specifically says so and even if the lease tries to waive the obligation. To constitute a breach, the defect must be of a nature and kind which renders the premises unsafe or unsanitary, and thus unfit for living therein. RSA 48-A:14 establishes specific minimum standards including requirements for pest-free conditions, functional plumbing, electrical safety, structural integrity, adequate water supply, and heating facilities capable of maintaining at least 65 degrees Fahrenheit in habitable rooms. [New Hampshire General Court - RSA 48-A:14 Minimum Standards Established]
Mold Disclosure Requirements
Disclosure rules matter most when owners, landlords, or sellers knew about prior leaks, cleanup, or recurring mold problems.
New Hampshire does not have a specific statewide mold disclosure requirement for rental properties. Landlords must comply with state housing standards and any local housing codes, and tenants should document conditions at move-in and communicate repair requests in writing. [New Hampshire DHHS - Housing Standards]
Local Regulations
Some cities and counties add complaint paths or property-maintenance rules on top of state law. Review local requirements alongside the statewide guide above.
Major City Mold Guides
Use these local guides when you need climate-specific inspection priorities, seasonal risk patterns, and city-level moisture context.
Manchester, NH
Local mold risks, prevention priorities, and next steps for Manchester.
Nashua, NH
Local mold risks, prevention priorities, and next steps for Nashua.
Concord, NH
Local mold risks, prevention priorities, and next steps for Concord.
Dover, NH
Local mold risks, prevention priorities, and next steps for Dover.
Derry, NH
Local mold risks, prevention priorities, and next steps for Derry.
Frequently Asked Questions
These FAQs focus on landlord duties and legal rights, apartment and rental next steps, and inspection and testing decisions because those are the issues most likely to shape mold disputes and repair decisions.
How long does a landlord have to fix mold in New Hampshire?
Can you withhold rent for mold in New Hampshire?
Can you break a lease because of mold in New Hampshire?
Assistance and Referrals
Find repair financing, disaster-assistance contacts, housing information and legal help. Each listing explains its role; eligibility, funding and services must be confirmed with the provider before work begins.
USDA Section 504 Home Repair Program
Ask USDA Rural Development whether your New Hampshire address and proposed repairs qualify for Section 504. Discuss the moisture source and repair scope before assuming mold work is eligible.
Eligibility: Owner-occupants in eligible rural areas who meet county income limits and cannot obtain affordable credit elsewhere. Grants have additional requirements, including age 62 or older and very-low income.
Coverage: Standard limits: loans up to $40,000 at 1% for 20 years; grants up to $10,000 lifetime; combined assistance up to $50,000. Approval and timing depend on eligibility and available funding.
NH Housing Finance Authority — housing resource inquiry
Ask NH Housing Finance Authority which local office or partner serves your New Hampshire address and whether any repair or housing assistance is currently accepting applications. Describe the leak or dampness and the repair you need.
Eligibility: Confirm the program’s service area, household and property requirements with the agency. This contact listing is not an eligibility determination.
Coverage: Before paying for work, ask about approved repairs, funding limits, waiting lists and whether prior approval is required.
University Extension Resources
New Hampshire Mold Complaint and Legal Resources
These agency and program links are the best starting point when you need primary sources, complaint channels, or official health guidance.