A 3.36-acre parcel on Old Field Road in Aquinnah came to market recently with a brook running through it, a one-room camp built in the 1970s, and a listing note that identifies several site constraints: wetlands on the property trigger a setback, and there is no well, septic system, or electric service in place. The parcel meets Aquinnah's zoning minimum with room to spare. What it doesn't do is tell you, in the acreage figure alone, how much of that 3.36 acres you're actually allowed to build on.
That difference between deeded acreage and buildable acreage is an important consideration in Aquinnah, where cliff erosion can affect the setback measured from the bluff crest.
Zoning Rules Beyond the Acreage Figure
Aquinnah's base residential zoning sets a minimum per lot, but the town's zoning bylaw includes additional rules. Layered on top of that base requirement are five separate overlay districts, each adopted at a different point in the town's history and each imposing its own additional rule: the Coastal District and the Island Road District, both dating to December 1975, the Gay Head Cliff Area District, added in May 1989, the Moshup Trail District, added in September 1995, and the Special Ways District.
Aquinnah's zoning bylaws set the Coastal District's 100-foot setback from wetlands, waterbodies, beaches, dunes, or the crest of any bluff over 15 feet high. That's the baseline. The Gay Head Cliff Area District goes further. Its bylaw language sets a setback floor from the crest of the bluffs that the town has written explicitly higher than the standard 100 feet, because along the cliffs, 100 feet of buffer isn't considered enough.
Two acres on a tax card in West Tisbury and two acres on a tax card in Aquinnah are not directly comparable numbers. In Aquinnah, you're not buying acreage. You're buying acreage minus whichever overlay districts happen to intersect that specific parcel.
The Setback That Moves Every Year
The Gay Head Cliff Area District's setback isn't measured from a fixed survey pin. It's measured from the crest of the bluff, and the crest is not staying put.
As The Martha's Vineyard Times reported, a geologist the town hired to study the cliffs found that between 1870 and 2012, the bluff retreated at an average rate of about 1.8 feet per year. Averages hide the part that matters more to a landowner: a single storm can strip away as much as 20 feet of cliff face in one event because erosion at the base of the cliffs weakens the ground above it and triggers landslides on top of the ordinary wave action.
The town has already paid for this reality once. In 2015, Aquinnah spent roughly $3.4 million moving the Gay Head Lighthouse 129 feet inland, because the ground it sat on was disappearing. Town officials and researchers are still trying to pin down what comes next: recent assessment work has focused on measuring the current erosion rate more precisely and understanding which storms do the most damage, with the tribe's historic preservation officer describing the outlook as something close to a wait-and-see situation rather than a solved problem.
Here's what that means for a buyer rather than a lighthouse. If your setback is measured from the crest, and the crest keeps moving inland by roughly a foot and a half most years, with occasional 20-foot jumps after a bad storm, then the buildable envelope on a cliff-adjacent lot in the Gay Head Cliff Area District is not a number you can lock in at closing. It's a number that can shrink again next winter. You can own the deeded acreage forever. You can't count on the buildable acreage staying the same size.
Wetlands and the Buildable Area
Away from the cliffs, the mechanism is different but the outcome is similar. Aquinnah's general wetlands bylaw, enforced by the town's Conservation Commission, requires up to a 200-foot buffer around coastal wetlands and a 100-foot buffer around freshwater wetlands, marshes, bogs, and the land within 200 feet of them. That's the standard the Old Field Road parcel runs into, and it's why a 3.36-acre lot with a brook running through it ends up with a no-build line cutting across a meaningful share of its footprint.
None of this shows up in the acreage figure on a listing sheet. It shows up in a site plan, in a wetlands delineation, or in a conversation with the Conservation Commission before you write an offer. The acreage on the deed measures what you own. It doesn't measure what you can put a foundation on.
The Land Bank Transfer Fee
A real estate purchase on Martha's Vineyard, Aquinnah included, may carry a cost that doesn't appear on a comparable-sales sheet from off-island: the Martha's Vineyard Land Bank's transfer fee.
The fee itself isn't static, either. In March 2026, the Land Bank commission voted to exempt deed-restricted affordable homes from the transfer fee entirely, a policy change the commission's executive director framed around treating those units as a kind of public asset the Land Bank shouldn't be taxing. It's a small change in dollar terms, but it's a reminder that the fee structure is a living piece of island policy, not a fixed line item you can assume will look the same in five years.
What This Means If You're Comparing Towns
If you're pricing Aquinnah against Chilmark, West Tisbury, or any other up-island option on a per-acre basis, the acreage figure is the least useful number for that comparison. A parcel that looks like a bargain per acre can cost considerably more per buildable square foot once you account for which overlay districts touch it and how close it sits to an actively retreating cliff line.
Before comparing price per acre across towns, it's worth asking a seller's agent three things: whether the parcel falls within the Gay Head Cliff Area District or the Coastal District, when the wetlands on the property were last formally delineated by the Conservation Commission, and whether a site plan exists showing the actual setback lines rather than just the tax map boundary. Those three answers tell you more about what you're buying than the acreage figure ever will.
Frequently Asked Questions
Does every parcel in Aquinnah sit inside one of these overlay districts? Not every lot, but a large share of the town does, given how much of Aquinnah borders the coast, wetlands, or the cliffs themselves. The overlay districts were adopted at different points from 1975 through the late 1990s specifically because so much of the town's land touches one of these sensitive features.
Can a cliff-crest setback be appealed or adjusted? This is a conversation for a real estate attorney and the town's building inspector, not a decision to make from a listing sheet.
If you're weighing a parcel in Aquinnah against acreage elsewhere on the island, the acreage number is only the starting point. Anson Realty works through the overlay districts, the wetlands history, and the closing costs specific to each property before you're comparing towns on anything less than the full picture. Request a private consultation to talk through what a specific Aquinnah parcel actually offers once the setbacks are drawn in.
This article is general information, not legal, tax or financial advice. Consult a qualified professional about your situation.
