Plumber Permits & Licenses in Dover, NH

Required for all LLCs. Annual report required separately (see below).

Many NH municipalities require alarm registration to reduce false alarms. Example: Manchester Police Alarm Ordinance.

Mandatory in most NH cities (e.g., Manchester, Nashua) for plumbers performing repairs, installations, or commercial work. Separate from state license; ensures compliance with local plumbing codes.

Applies to all LLCs. Online filing required.

Required for any business employing plumbers or performing plumbing work. Applicant must be 18+, pass exam (administered by PSI), and provide proof of 5 years experience or equivalent. Journeyman license ($100 initial + $120 license) also available with 4 years experience + exam.

Required if using an assumed business name (DBA). Renewed only if name changes.

Form DP-80. Required for collecting sales tax on taxable services/materials or paying BET. Plumbers may need if selling fixtures/parts.

Plumbers in NH may be required to collect sales tax on parts and certain fixtures sold to customers. Labor for residential plumbing is generally not taxable unless bundled with taxable materials. Registration is required even if no current sales, if future taxable sales are expected.

Required for all employers paying wages to employees in New Hampshire. Includes withholding state income tax from employee wages. Applies regardless of business structure if W-2 employees are hired.

Employers must register with NHES and pay quarterly UI taxes on first $16,000 of each employee’s wages (as of 2024). New employers pay 0.06% rate; rates vary after experience rating.

NH LLCs are generally pass-through entities and not subject to BPT unless they elect corporate taxation. The BPT applies at 7.6% on business income over $50,000. Most sole proprietorship or partnership-style LLCs avoid this tax.

BET is 0.575% of enterprise base (wages, interest, dividends). Applies to most businesses including LLCs taxed as pass-throughs if thresholds are met. Most small plumbing LLCs may not meet threshold initially.

Not all NH towns impose a local business tax. Examples: Manchester requires a Business Privilege Tax; Nashua has a Business Tax. Must register with the city/town clerk. Fee often based on business type and estimated revenue.

Single-member LLCs with no employees may use owner's SSN, but obtaining an EIN is recommended for liability protection. Required for all multi-member LLCs and those with employees.

New Hampshire does not have a uniform statewide local business license requirement. Many municipalities do not require a general business license for plumbers. Check specific city/county ordinances (e.g., Manchester, Nashua). Plumbers must hold state license; local registration may apply.

Zoning approval required for business location. Home occupations may need special permit if client visits or storage of materials. Example: Manchester Zoning Ordinance Sec. 32-3. Check local planning department for specific city/county.

Building permits needed for structural changes, plumbing installations in business space. Issued by local building official per International Building Code (adopted locally). Fees per municipal fee schedule.

Most municipalities require permits for business signs per local zoning/sign codes. Example: Nashua Sign Ordinance Chapter 38.

Mandatory for all employers with one or more employees in New Hampshire, including part-time workers. Sole proprietors without employees are exempt but may elect coverage. Coverage must be obtained through private insurers or the state fund (New Hampshire Insurance Department-approved carriers).

While not universally mandated by statute, the OPLC requires proof of liability insurance (minimum $100,000 per occurrence, $300,000 aggregate) for plumbing contractors applying for a license. This is a condition of licensure, not a freestanding insurance mandate.

A $10,000 surety bond is required for all plumbing contractors applying for licensure in New Hampshire. The bond protects consumers against violations of state plumbing regulations. Required under RSA 310-A:18 and administered by OPLC.

New Hampshire law requires all motor vehicles registered to a business to carry liability insurance meeting minimum limits: $25,000 bodily injury per person, $50,000 per accident, and $25,000 for property damage. Applies regardless of business type. See RSA 264:17.

Not legally required by general statute, but OPLC requires proof of liability insurance (which may include coverage for errors and omissions) as part of licensure. The required policy must cover at least $100,000 per occurrence and $300,000 aggregate. This is interpreted to include professional liability risks inherent in plumbing work.

Not specifically mandated by New Hampshire law. However, businesses selling tangible goods may face product liability claims. Coverage is strongly recommended but not required. General liability policies often include limited product liability protection.

Not required for plumbing businesses unless the business operates a bar, restaurant, or event space where alcohol is served. Standard plumbing LLCs are not subject to this requirement.

Not mandated by state statute for all plumbers, but often required by landlords, lenders, or local business licensing offices. Covers damage to business property from fire, theft, or water events.

All LLCs with employees or those that withhold taxes must have an EIN. Single-member LLCs without employees may use the owner's SSN unless they file specific tax forms. This is a federal requirement regardless of state.

Fire safety inspection for occupancy. Plumbing businesses storing flammables may need hazardous materials permit.

Certificate verifies code compliance before business occupancy. Issued after building/fire inspections.

All employers, including plumbing LLCs, must complete Form I-9 to verify identity and work authorization for each employee. E-Verify is not federally required unless the business has federal contracts. However, New Hampshire does not mandate E-Verify for general employers.

Covers minimum wage, overtime (1.5x regular rate for hours over 40/week), recordkeeping, and child labor standards. Applies to plumbing businesses engaged in interstate commerce (which includes most businesses using phones, internet, or out-of-state supplies). Even local plumbing services typically meet this threshold.

Requires eligible employees to be granted up to 12 weeks of unpaid, job-protected leave per year for qualifying medical or family reasons. Most small plumbing LLCs will not meet the 50-employee threshold, but larger firms must comply. Notice requirements and documentation must be followed.

Most plumbing businesses are conditionally exempt small quantity generators (CESQG) if they produce less than 220 lbs of hazardous waste per month. CESQGs are not required to obtain an EPA ID number or file reports, but must ensure proper disposal. If waste thresholds are exceeded, full RCRA compliance is required.

There is no federal license required to operate as a plumber. Licensing is handled entirely at the state and local level in New Hampshire. This is a key distinction: federal requirements focus on tax, safety, and environmental compliance, not trade licensure.

Most plumbing work does not involve asbestos, but older homes may contain ACMs. If disturbed, federal rules require trained personnel, containment, and disposal procedures.

Check product SDS sheets to determine if materials are DOT-regulated. Requires proper labeling, shipping papers, and employee training.

All LLCs registered in New Hampshire must file an annual report each year on or before the anniversary date of the company’s formation. The report confirms or updates business information such as principal address, registered agent, and management structure.

Plumbers in NH must hold a valid license issued by the OPLC. Licenses are renewed every three years. Renewal requires proof of active license during the cycle and payment of fee. There is no continuing education requirement for renewal as of 2024.

While the EIN itself does not require renewal, businesses must use it to file regular federal tax returns. This includes quarterly Form 941 (if employees exist), annual Form 940 (unemployment), and Form 1120-S or 1065 if applicable.

The Business Profits Tax applies to entities with business earnings over $100,000. LLCs taxed as pass-through entities may pass income to owners, but if the entity itself earns over the threshold, it must file. Due date aligns with federal tax deadlines.

The BET is assessed on the total enterprise value. Most small plumbing LLCs may fall below the threshold, but must file if over $250,000. Filing is required even if no tax is due.

Self-employed individuals, including LLC owners, must make estimated tax payments quarterly if they expect to owe $1,000 or more. Payments cover income and self-employment taxes.

A single-member LLC is disregarded for federal tax purposes and reports income on Schedule C of Form 1040. Multi-member LLCs are taxed as partnerships and must file Form 1065. All profits are subject to self-employment tax unless structured otherwise. This is standard for all LLCs but particularly relevant for trade businesses like plumbing with significant net earnings.

Plumbers may be exposed to hazards such as confined spaces, electrical risks, and chemical exposure. Employers with 11 or more employees must maintain OSHA Form 300 (injury and illness log). All employers must report fatalities within 8 hours and hospitalizations within 24 hours. Specific standards under 29 CFR 1910 apply to general industry safety practices.

If the LLC operates a physical office or service center accessible to customers, it must comply with ADA Title III accessibility standards under the 2010 ADA Standards for Accessible Design. This includes accessible entrances, restrooms, and service counters. Mobile plumbing technicians serving customer sites are not required to make client locations ADA-compliant.

Plumbers who disturb painted surfaces (e.g., removing old pipes, fixtures, or walls) in pre-1978 housing must be EPA-certified as a Renovation Firm and use certified renovators. This includes following lead-safe work practices, containing work areas, and cleaning verification. Applies to any job involving more than minor repairs. Certification is required even for small projects.

Under the FTC's Cooling-Off Rule, customers must be informed of their right to cancel a contract within three business days. The business must provide a cancellation form and written notice. Also, all advertising must be truthful and not misleading under FTC Act Section 5. Plumbers making claims about speed, pricing, or quality must have substantiation.

Businesses expecting to owe $200 or more in BPT or BET must make quarterly estimated payments. Due dates differ slightly from federal schedule.

Federal law requires all employers with employees to display the OSHA Job Safety and Health Protection poster in a conspicuous location. Available for free download from OSHA website.

Employers in NH must display current state labor law posters, including minimum wage, workers' compensation, and equal opportunity employment. Posters available free from NH DOL website.

Licensed plumbers must display their license number on all vehicles, invoices, advertisements, and business cards. The physical license does not need to be posted but must be available for inspection upon request.

IRS recommends keeping financial records (including receipts, invoices, bank statements) for at least 3 years. For claims involving bad debt or loss carrybacks, retain for 7 years. Employment tax records must be kept for at least 4 years.

All employers with one or more employees must carry workers' compensation insurance. Sole proprietors without employees are exempt. Coverage must be maintained continuously.

Applicants for a plumbing license must provide proof of general liability insurance with minimum limits of $300,000 per occurrence and $500,000 aggregate. Not required annually unless requested, but must be maintained.

EINs do not expire, but businesses must notify the IRS of changes using Form 8822-B. Failure to update may delay tax processing or communications.

New Hampshire does not have a general sales tax. However, if a plumber sells tangible personal property (e.g., fixtures) with labor, and marks up the item, the full amount may be taxable. Registration is one-time, but periodic returns are required based on assigned frequency.

Plumbers who sell taxable items (e.g., water heaters, faucets) must collect and remit sales tax. Most labor is exempt, but materials may be taxable if sold separately or marked up. Filing frequency is assigned by DORA.