NH dock sizes allowed based on the water frontage of your property
Less than 75 feet A single 4-foot × 24-foot dock. You must have abutter’s consent if the dock will be placed closer than 20 feet to abutter’s property line.
75 feet to 149 feet 2 Slips
150 feet to 224 feet 3 Slips
225 feet to 299 feet 4 Slips
300 feet to 374 feet 5 slips
New docks or additions to existing docks must be located at least 20 feet from abutting property lines, including the imaginary extensions of those property lines over the water. Any boat secured to a dock may not extend beyond the extension of the abutter's property line.
If an applicant proposes to place docking structures within 20 feet of an abutter’s property line or the imaginary extension of the property line over the water, the applicant must provide a signed, notarized letter from the adjacent property owner granting permission for the new docking structure to be placed within 20 feet of his/her property line.
Of course docking structures that do not meet today's regulations but were in place before the current regulations are generally grandfathered as long as they were legal when they were built.
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