Howard County, MD Building Setbacks & Zoning: Setback Rules (2026)
Key Facts
- R-20 front setback
- 20 feet from lot line
- R-20 side setback
- 10 feet
- R-20 rear (principal)
- 30 feet
- Accessory rear/side
- 10 feet
- Section
- Zoning Reg. 108.0.D.4
Summary
In Howard County's common R-20 residential district, principal structures must sit at least 20 feet from the front lot line, 10 feet from side lines, and 30 feet from the rear. Larger setbacks apply along arterial or collector roads.
Minimum setback requirements... c. From lot lines (1) Structures (a) Front .....20 feet ... (b) Side .....10 feet (c) Rear (i) Principal structure .....30 feet (ii) Accessory structure .....10 feet
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 91 | Zoning: Supplement 25).
Full Breakdown
Howard County zones all unincorporated land, so district bulk tables set building setbacks countywide. In the R-20 (Residential: Single) District, minimum setbacks from lot lines are 20 feet in front (30 feet for pipestem lots facing the project boundary), 10 feet on each side, 30 feet at the rear for a principal structure, and 10 feet for accessory structures. Setbacks measured from an arterial or collector public street right-of-way rise to 40 or 50 feet, and from other public streets 30 or 50 feet. Other districts (R-12, R-SC, RC, RR) have their own tables in the Zoning Regulations.
Violations & Fines
Structures built inside a required setback violate the Zoning Regulations; DILP can deny permits, issue violations, or require alteration. A variance from the Hearing Examiner is needed to encroach.
Frequently Asked Questions
How far must a house sit from the property line in R-20?
Are setbacks larger along main roads?
Sources & Official References
Other rules in Howard County
Compare Howard County to another location·View the Maryland building setbacks & zoning overview
See something wrong?
Help us keep this page accurate. If you notice an error or outdated information, let us know.