Shed Permit Requirements in New Hampshire

The State Code Sets the Baseline, Towns Set the Rules

New Hampshire's approach to shed permits reflects the state's deep tradition of local governance. The New Hampshire State Building Code (RSA 155-A) establishes a uniform baseline that applies to all construction statewide, based on the 2021 International Residential Code (IRC) with New Hampshire-specific amendments. Under this code, one-story detached accessory structures used as tool sheds, storage sheds, playhouses, and similar uses are exempt from a building permit if the floor area does not exceed 200 square feet.

But that 200-square-foot exemption only covers the building permit. It doesn't exempt you from zoning rules, setback requirements, wetland buffers, or any other local ordinance your town has adopted. And in New Hampshire, towns have wide latitude to add requirements on top of the state code. Counties, towns, cities, and village districts can adopt additional regulations under RSA 674:51 or RSA 47:22, as long as those rules are at least as strict as the state building code.

The result is a patchwork: some towns follow the IRC's 200-square-foot exemption closely, others set a stricter threshold at 100 square feet, and a few require permits for all sheds regardless of size. For a broader perspective on how shed permits work nationally, see our national guide to shed permits.

What the 200-Square-Foot Exemption Actually Means

The IRC's exemption in Section R105.2 is narrower than many homeowners realize. To qualify, a shed must be:

• One story with no loft or second level
• Detached from the primary dwelling
• Used for storage, tools, or similar purposes only
• Under 200 square feet of floor area

If the shed meets all four criteria, you don't need a building permit under the state code. But you almost certainly still need a zoning permit or land use permit from your town. The zoning permit verifies that your shed meets local setback requirements, doesn't violate lot coverage limits, and complies with any overlay district rules like wetland buffers or historic preservation zones.

Adding electrical wiring, plumbing, or mechanical systems to a shed triggers a separate permit requirement regardless of size. A shed with lights and outlets is no longer just a storage shed in the eyes of the building code. Electrical permits in New Hampshire can only be pulled by a licensed master electrician, though homeowners can do their own wiring under a Homeowner Affidavit in some municipalities.

A shed on a permanent foundation may also trigger a building permit even if it's under 200 square feet. Some towns, like Bedford, explicitly require permits for sheds placed on concrete blocks or floating slabs. Skid-mounted and gravel-pad foundations are generally treated more leniently, but this varies by municipality.

How Five New Hampshire Cities Handle Shed Permits

Manchester: Zoning Review for All Sheds

Manchester is New Hampshire's largest city and follows the state building code's 200-square-foot exemption for building permits. However, all new structures require zoning review through the Planning and Community Development Department. You need to submit a building and zoning application with a plot plan showing where the shed will be located relative to property lines, even for small sheds.

Manchester charges a $25 non-refundable processing fee on all permit applications, plus additional fees based on project valuation for sheds that require a full building permit. The city enforces setback requirements that vary by zoning district, so checking the dimensional requirements for your zone is an important first step. Permits are typically reviewed within one to two weeks.

Nashua: Land Use Permit Required for Every Shed

The city of Nashua makes it clear: a shed under 200 square feet does not require a building permit, but a land use permit is required for any size shed. You need to submit a Building and Land Use application with a plot plan showing the shed's location relative to property lines. If you don't have a plot plan, one can be obtained from the property file at the Building Safety Department.

For small sheds under 200 square feet, Nashua charges a $30 minimum permit fee for the land use review. Larger sheds that require a full building permit are charged $0.13 per square foot of affected area, plus a $35 filing fee and a $25 land use review fee. If you build without a permit and get caught, the city charges a 100% surcharge on the applicable fee, up to $275 for residential projects.

Nashua also has specific snow load, wind load, and seismic requirements that apply to all construction. Even a small exempt shed should be designed to handle local conditions.

Concord: Accessory Buildings Have Their Own Setback Rules

New Hampshire's capital city treats accessory buildings as a distinct category in its zoning ordinance. Concord requires zoning and site plan approval before any building permit can be issued. Sheds, greenhouses, and other accessory structures have their own setback requirements that differ from the main dwelling's setbacks.

Concord uses a ground snow load of 70 pounds per square foot, which is higher than many southern New Hampshire communities. This affects roof design even for small sheds. The city's Code Administration Division handles permits through an online Citizen Self Service portal, and separate trade permits are required for any electrical, plumbing, or mechanical work.

Derry and Dover: Typical Mid-Size Town Approaches

Derry and Dover both follow the 200-square-foot building permit exemption but require zoning compliance verification for all accessory structures. Both towns require a plot plan showing the shed's location, and both enforce setback requirements that vary by zoning district.

Derry requires a separate electrical permit for any shed with wiring, and only a licensed New Hampshire master electrician can apply for the permit. Dover requires a zoning permit for all accessory structures and reviews applications for compliance with dimensional requirements, lot coverage limits, and environmental overlay districts.

Setback Rules Vary by Town and Shed Size

Setback requirements are one of the most common stumbling blocks for shed projects in New Hampshire. The rules differ not just from town to town, but sometimes based on the size of the shed itself.

Hampton, for example, uses a tiered system: sheds 100 square feet or smaller and 12 feet or shorter in height need only maintain a 4-foot setback from side and rear property lines, but must maintain the full front yard setback for their zone. Sheds larger than 100 square feet must meet the full setback requirements of their zoning district, which are typically much greater.

Lebanon uses a similar approach. Sheds 130 square feet or smaller can be placed within 5 feet of side and rear property lines, while larger sheds must meet all standard setbacks for the zoning district. This distinction makes a meaningful difference in where you can place a shed on a smaller lot.

As a general rule, most New Hampshire towns prohibit sheds in the front yard or require that front yard setbacks be maintained at all times. Side and rear setbacks for small sheds are often relaxed to 3 to 5 feet, while larger sheds must maintain 10 to 25 feet or more depending on the zone.

Snow Loads and New Hampshire Weather

New Hampshire's climate puts real demands on shed construction. The state sits in a heavy snowfall region, and ground snow loads vary dramatically depending on location and elevation. Southern New Hampshire towns near the Massachusetts border typically see ground snow loads of 50 to 60 pounds per square foot. The seacoast area around Portsmouth and Dover is slightly lower. But move north or uphill and the numbers climb quickly. The White Mountains region and northern tier can exceed 100 pounds per square foot.

Even if your shed is exempt from a building permit, it still needs to be structurally sound enough to handle the snow load for your area. A collapsed shed is a safety hazard and can damage neighboring structures or vehicles. Pre-built shed manufacturers who sell in New Hampshire generally design their roofs for the applicable snow loads, but it's worth confirming this before purchase.

Wind loads and frost depth also matter. New Hampshire's frost line ranges from about 48 inches in the south to 60 inches or more in the north. If your shed is on a permanent foundation, the footings typically need to extend below the frost line to prevent heaving. Temporary foundations like skids or gravel pads avoid this requirement but may shift over time in freeze-thaw cycles.

Foundation Types and How They Affect Permits

The type of foundation you choose can determine whether your shed needs a building permit, even if it's under 200 square feet.

Skid-mounted sheds sit on pressure-treated wood runners placed directly on level ground or a gravel pad. Most towns treat these as the simplest option, and they rarely trigger a building permit on their own for small sheds.

Concrete block foundations involve setting the shed on a grid of concrete blocks. Some towns, like Bedford, have been reported to require permits for sheds on block foundations even when the shed is under 200 square feet, because they consider blocks a more permanent installation.

Poured concrete slabs are treated as permanent foundations in virtually every New Hampshire town. A shed on a concrete slab is more likely to be counted toward lot coverage calculations and is more likely to trigger setback requirements.

Post-and-beam foundations with concrete piers below the frost line are the most permanent option and will almost always require a building permit regardless of shed size.

The general pattern: the more permanent the foundation, the more likely you'll need a permit and the stricter the setback requirements.

Wetlands, Shoreland, and Environmental Buffers

New Hampshire has extensive wetland and shoreland protection rules that can affect shed placement. The state's Shoreland Water Quality Protection Act (RSA 483-B) restricts construction within 250 feet of public waters. Local wetland buffers add another layer.

Barrington's zoning ordinance provides a useful example. Sheds under 200 square feet may be placed within wetland buffer areas if they are constructed on posts or pilings that allow the unobstructed flow of water, and if the natural contours of the wetland are preserved. An Administrative Zoning Permit is required to verify compliance. Sheds over 200 square feet in wetland areas face the full provisions of the town's wetland protection ordinance.

If your property is in a floodplain, near a lake or river, or adjacent to mapped wetlands, check with your town's conservation commission or planning board before placing a shed. These restrictions apply regardless of size.

HOA Restrictions

New Hampshire has a growing number of Homeowners Association (HOA)-governed communities, particularly in the southern tier near the Massachusetts border and in the Lakes Region. Towns like Salem, Londonderry, and Merrimack have significant numbers of HOA-governed developments.

HOA rules on sheds can be stricter than municipal codes. Common restrictions include limits on shed size, requirements to match the home's siding and roofing materials, prohibitions on metal or vinyl sheds, screening requirements to hide the shed from the street, and outright bans on sheds in some communities. Always check your HOA's covenants, conditions, and restrictions (CC&Rs) before purchasing or building a shed.

Consequences of Skipping the Permit

Building a shed without a required permit in New Hampshire can lead to:

• Stop-work orders from the building inspector or code enforcement officer
• Fines and after-the-fact permit fees with surcharges. Nashua, for example, charges a 100% surcharge for permits obtained after construction has started.
• Orders to remove the shed if it violates setbacks or other zoning rules and a variance cannot be obtained
• Problems at sale when a home inspection or title search reveals an unpermitted structure
• Insurance issues if the shed is damaged or causes damage and the insurer discovers it wasn't permitted

The cost of a shed permit in New Hampshire is modest. Most towns charge between $25 and $100 for a small shed. The risk of building without one is not worth the savings.

If you're also planning a garage or carport alongside your shed, each structure will need its own permit and must comply with the total lot coverage allowed in your zoning district.

For an overview of all building permit requirements in New Hampshire — including decks, fences, pools, and more — see our complete New Hampshire building permit guide.