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Per House Bill (HB) 562, NH adopted the 2015 ICC codes with State amendments and the 2017NEC effective September 15, 2019.
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A shed under 200 square feet does not require a building permit. Although, a Land Use Permit is required for any size shed. Therefore, a Building and Land Use application will need to be submitted with a Plot Plan showing where the proposed shed will be located. If you do not have a Plot plan, one may be obtained from the property file at the Building Safety Department.
The State of New Hampshire requires a license of the person engaging in the business of either plumbing or electrical. Effective January 1, 2008 a NH Gas Fitter License will be required to install any gas piping or gas fired equipment.