Key Regulatory Standards

Land Coverage and Setback

In order to manage the visual impact of the larger structures, the Connecticut River Gateway Commission has established minimum zoning standards to protect the natural and traditional riverway scene.

The amount of land used for construction or placement of buildings — lot coverage — and the distance from the water such buildings are located – setback — are among those standards.

Regulations specify that buildings may not exceed a maximum total land coverage on the various sized lots or parcels of land that are outlined below. A building lot of 40,000 square feet is about 0.92 acres.

new construction
Type of District Range of Minimum Lot Sizes Maximum Percentage of Land Coverage Permitted
Residential Up to 20,000 sq. ft. 25%
20,000-40,000 sq. ft. 15%
Above 40,000 sq. ft. 10%
Commercial (including waterfront) All sizes 40%
Industrial All sizes 25%

Since 1974, the Gateway Commission has required that buildings or structures, except for marine facilities, be set back a minimum distance from the River. The Commission found that a setback allows new construction while preventing damaging erosion, increasing unacceptable impervious surface, negative impacts to the natural buffer between development and the river, and preserving the riverway scene.

A 2021 regulation amendment states that buildings or structures may not be constructed, expanded or placed within 100 feet of the “coastal jurisdiction line” of the Connecticut River, as defined by State law.

Per its judgement, a town planning and zoning commission may issue a special permit to reduce the setback requirement for structures that need water access such as piers, docks, and boathouses.

This page is intended only as a general summary. Please refer to the Commission’s standards for complete regulatory language.

Tree lined riverbank

Maples, Oaks, Beech, Birch & Pine

Tree-lined riverbanks contribute greatly to the Connecticut River’s cherished “natural and traditional scene.” A coastline like that enjoyed by the sailor shown at left need not be found only in preserves. Riverfront landowners can enjoy great views and keep the lower river valley beautiful with simple tree pruning practices. “Limbing up” a tree’s lower branches, while leaving upper canopies untouched benefits everyone.