How Cary Handles Accessory Structures: A Practical Guide

Cary maintains 106 local ordinances across all categories, and 2 of those deal specifically with accessory structures. Here is a breakdown of what the city actually requires, what is prohibited, and where Cary falls on the strict-to-permissive spectrum compared to other cities.

ADU Rules

Cary allows one accessory dwelling unit per lot with a detached, single-unit home, capped in size and limited to one off-street parking space.

Key details: Units allowed per lot: 1. Size cap (small lot): 800 sq ft or 50% of house. Size cap (large lot, 40,000+ sf): 1,000 sq ft. Parking required: 1 off-street space. Home occupation in ADU: Prohibited.

Building an unpermitted ADU, exceeding the size cap, or adding a second ADU on the same lot is a zoning violation subject to enforcement by the Planning Department and correction or removal of the noncompliant structure.

Shed & Carport Rules

Cary caps detached sheds and other accessory buildings at 33% of the house's heated floor area and requires them to meet Chapter 6 setbacks.

Key details: Floor-area cap: 33% of home's heated area. Setback rule: Meets Chapter 6 standards. Easements: Sheds barred from easements. Large lots (40,000+ sf): Different size caps apply.

An oversized or misplaced shed is a zoning violation; the Town can require reduction, relocation, or removal, and some accessory structures need an Accessory Use Permit before construction.

The Bottom Line

Cary's accessory structures rules are a mixed bag. Some areas are strict, others are relaxed, and the details matter. The best approach is to check the specific rule that applies to your situation rather than assuming Cary is broadly strict or permissive.

This guide is based on Cary's current municipal code. Local rules can and do change, so check the individual ordinance pages for the latest details, penalties, and FAQs.