Decks & Porches in Tisbury, Massachusetts

Tisbury is in Eversource electric territory. Decks and porches are not eligible for Mass Save rebates regardless of utility, so Eversource service has no bearing on your deck project cost.

All deck permits in Tisbury go through the Tisbury Building Department under 780 CMR. Because the town sits directly on Vineyard Sound and is surrounded by tidal wetlands, ponds, and shoreline, the Tisbury Conservation Commission is involved in nearly every deck project near the water. Any deck within 100 feet of a wetland, coastal bank, or tidal area requires a Notice of Intent under the Wetlands Protection Act. Vineyard Haven's historic village also has a local Historic District Commission that must approve exterior changes to properties within its boundaries.

The Tisbury Building Department issues building permits for all attached decks and freestanding decks above 30 inches under 780 CMR. Frost depth on Martha's Vineyard runs roughly 36 to 42 inches; contractors typically use Sonotubes or helical piles. Because of the island's heavy coastal and tidal wetland coverage, Conservation Commission review under the Wetlands Protection Act is a near-universal requirement for waterfront or near-water projects. Properties in the Vineyard Haven Historic District also require Historic District Commission approval for any visible exterior changes.

Deck costs in Tisbury run 25 to 40 percent above comparable mainland MA projects because of island logistics. Material barging and the limited pool of year-round island contractors add to base pricing. A 300-square-foot composite deck (the practical standard here given salt air) runs $38,000 to $60,000 installed. Pressure-treated pine decks, where used, run $24,000 to $36,000 but require more frequent maintenance in the marine environment. A screened porch or three-season room on a Vineyard Haven colonial can run $55,000 to $80,000 fully finished.

Tisbury is the main commercial and ferry hub of Martha's Vineyard in Dukes County, with about 4,809 year-round residents but over 3,126 housing units, a gap that reflects the island's heavy seasonal population. The median home age of 47 years points to mid-1970s to early 1980s construction across much of the stock, though Tisbury's Vineyard Haven village holds older waterfront homes from the 19th century.

Island conditions drive every material choice here. Salt air from Vineyard Sound accelerates wood decay even on pressure-treated lumber, and the marine environment makes composite or PVC decking the practical default for most Tisbury projects. Contractor availability and material barge logistics on the island push costs and lead times higher than mainland MA, so early planning is essential.