Zoning Guide

Durham Setbacks & Height Limits — Residential Zones

Last updated: Verified:

Fact-checked against the current Durham Unified Development Ordinance on September 21, 2026.

Durham's residential dimensions are controlled by both the zoning district and the housing type. The previous page's single RS-8 / RS-10 / RS-20 setback table was misleading because the UDO provides separate tables for conventional detached houses, zero-lot-line houses, traditional houses, attached houses, and other forms.

Current RS Districts

Current §6.3 identifies the Residential Suburban districts:

  • RS-20;
  • RS-10;
  • RS-8;
  • RS-M.

The UDO then directs users to §7.1 Housing Types for the lot dimensions and required yards that apply to the proposed form.

Lot Size Depends on Housing Type and Subdivision Method

For a conventional subdivision, the current single-family detached/traditional-house framework includes base lot areas of:

District Base Lot Area
RS-20 20,000 sq ft
RS-10 10,000 sq ft
RS-8 8,000 sq ft
RS-M 5,000 sq ft

Qualifying lot averaging and cluster subdivision provisions can reduce those lot areas under the UDO.

Traditional House Example

A Traditional House is a specific housing type designed to sit closer to the street and use rear vehicular access.

For conventional subdivisions, the current Traditional House table uses:

Standard RS-20 RS-10 RS-8
Street yard 5 ft 5 ft 5 ft
Minimum single side yard 12 ft 10 ft 9 ft
Total side yards 30 ft 24 ft 22 ft
Rear yard 25 ft 25 ft 25 ft

Those numbers are not the conventional detached-house envelope. They demonstrate why the old page's district-only table could not be applied to every house.

Infill and Neighborhood Protection Can Modify Yards

The housing-type tables expressly note that yards can be modified by:

  • Neighborhood Protection Overlays;
  • §6.8 infill regulations;
  • lot averaging;
  • cluster-subdivision provisions.

A parcel analysis therefore needs more than the zoning abbreviation.

Height

Current RS district height is regulated through §6.3 and can interact with additional setback provisions. In the Suburban Tier, the code permits specified additional height in RS-20, RS-10, and RS-8 where additional setback is provided.

Do not use the previous blanket “35 ft” statement without checking the current district and housing type.

How to Check a Property

  1. Confirm the current zoning district.
  2. Identify the proposed housing type under §7.1.
  3. Determine whether the project is conventional, cluster, or uses lot averaging.
  4. Apply the corresponding housing-type table.
  5. Check infill, Neighborhood Protection, watershed, historic, airport, and other overlays.
  6. Confirm parcel-specific questions with Durham City-County Planning.

Official Sources

This guide is informational only. The current UDO, housing type, subdivision method, and parcel-specific conditions control.

More about Durham Zoning

Building Permits — Cost & TimelineADU Rules in Durham, North Carolina

Sources

  1. Durham Unified Development Ordinance (UDO)·library.municode.com·Accessed 2026-04-14·Direct link
  2. Durham City-County Planning Department·durhamnc.gov·Accessed 2026-04-14·Direct link

FAQ

What are the setback requirements in Durham residential zones?
Setbacks in Durham vary by zoning district. Typical single-family residential zones use a 20 ft front setback with 5 ft interior side and 15 ft rear setbacks in RS-8, 25 ft front with 8 ft side and 20 ft rear in RS-10, and 30 ft front with 10 ft side and 25 ft rear in RS-20. Always verify your specific zone on the Durham zoning map.
What is the maximum building height in Durham residential zones?
Maximum building height in Durham's RS-8, RS-10, and RS-20 single-family residential districts is typically 35 ft, measured from average grade to the highest point of the roof. Rural Residential (RR) generally follows the same 35 ft limit, and Residential Urban (RU) districts vary depending on the specific subtype and context.
How is lot coverage calculated in Durham?
Lot coverage is the percentage of the lot covered by buildings and impervious surfaces. Durham's Unified Development Ordinance sets district-specific coverage limits; single-family zones such as RS-8, RS-10, and RS-20 allow roughly 30 to 40 percent building coverage. Check the UDO district dimensional table for your exact zone.
Does North Carolina override Durham's setback rules for ADUs?
No. North Carolina does not have a statewide ADU law that overrides local setback or height requirements. Durham sets its own ADU standards through the Unified Development Ordinance, so ADUs must meet the dimensional rules of the underlying zoning district unless the UDO specifies an exception.