What is Open Space Residential Design (OSRD)?

Also known as "Conservation Subdivision," “Cluster” or “Natural Resource Protection” Zoning, OSRD bylaws allow developers to create a subdivision with smaller lot sizes, so long as they place the balance of the project’s overall land into permanent land preservation. Developers win by being able to create the same amount of house lots, and in some cases the flexibility to add more, as they would under conventional lot layouts, and communities win by having land preservation accompany development.

OSRD Project Overview

As part of a two-year project - funded through the Executive Office of Energy and Environmental Affairs (EEA) FY23 Planning Assistance Grant - SRPEDD reviewed existing OSRD-related bylaws in the region for low impact development design principles using Mass Audubon’s Bylaw Review Tool. SRPEDD also compiled a regional database of bylaws, conducted one-on-one interviews with municipal staff, and identified regional challenges and potential solutions related to adopting and implementing OSRD bylaws.

For two case study communities—Dighton and Middleborough—SRPEDD has reviewed and recommended updates to each town’s bylaw and has been working closely with both communities to prepare updated versions. This includes providing guidance and support to help educate the public and town staff on the provisions of the revised bylaws.

This work will culminate in a regional peer-to-peer learning event, where all communities interested in revising or adopting OSRD bylaws can come together to learn about best practices and implementation strategies. This event, “Nature-Sensitive Designs for Open Space & Housing,” will be held on June 11, 2025, from 12:00 p.m. to 2:00 p.m. at the Middleborough Public Library.