Renovating a House Inside the Cape Cod National Seashore

Private homes inside the Cape Cod National Seashore can be repaired, re-roofed, re-sided and remodeled, but each Outer Cape town has a Seashore zoning district that limits how much a house can grow. The National Park Service counted about 105 private properties inside the Seashore in Eastham, about 251 in Wellfleet and about 211 in Truro in 2024, with only a handful in Orleans and Provincetown.

Work that stays inside the existing house, like a new roof, siding, windows, a kitchen or a bathroom, generally needs only the usual building permit and, near the water, a conservation filing. Additions, rebuilds and new accessory buildings are where the Seashore rules come in.

Eastham

In Eastham's Seashore District F, existing homes may be altered or enlarged, but habitable space may not grow more than 50 percent over what existed on September 1, 1959, and accessory space may not exceed 50 percent of total habitable space. A 50 foot street setback and 25 feet from abutters apply. The Building Inspector notifies the Secretary of the Interior of building permit applications in the district, and the bylaw advises owners to consult the National Seashore before applying. Eastham.

Wellfleet

Wellfleet's National Seashore Park District caps gross floor area on a scale tied to lot size, up to 3,600 square feet for the house plus accessory buildings on larger lots, and the dwelling itself may not exceed 2,800 square feet. Tearing down, rebuilding, altering or adding accessory buildings beyond those limits needs a special permit. Wellfleet's demolition delay also counts removing exterior walls or a roof as demolition for buildings 75 years or older. Wellfleet.

Truro

Truro's Seashore District limits total gross floor area by right to 3,600 square feet on a 3 acre lot, plus or minus 200 square feet per acre. A special permit can raise that to 4,600 square feet on 3 acres and no further. Site plan review applies when work adds more than 1,000 square feet, adds a story, or builds or rebuilds a dwelling. Truro.

Orleans and Provincetown

Only about one private property in each town sits inside the Seashore, so these rules rarely touch homes there. In Provincetown, roughly three quarters of the town's land is National Seashore, which is why homes are concentrated along the harbor. Orleans, Provincetown.

Planning a project in the Seashore

The useful order is: confirm the zoning district and existing floor area from town records, decide what the project can include, then design. For exterior work, salt and wind exposure on the Outer Cape call for corrosion-resistant fasteners, well-detailed flashing and materials that can sit through a winter unattended, since many of these homes are seasonal.