Building Setbacks & Zoning in Alexandria, VA

Alexandria maintains 116 local ordinances across all categories, and 3 of those deal specifically with building setbacks & zoning. Here is a breakdown of what the city actually requires, what is prohibited, and where Alexandria falls on the strict-to-permissive spectrum compared to other cities.

Lot Coverage Limits

Alexandria caps building footprint zone by zone rather than citywide. In the RT/Townhouse zone, the most common lot-coverage limit for rowhouse infill, Section 3-1306(B) allows "no more than 30 percent of any lot" to be covered by buildings or structures, on top of a 0.5 floor area ratio and 35-foot height cap.

Key details: RT zone coverage cap: 30% of lot (§ 3-1306(B)). RT zone FAR: 0.5 maximum. RT zone height limit: 35 feet. R-20 zone standard: 0.25 FAR, no stated coverage %. Enforcing agency: Alexandria Dept. of Planning & Zoning.

Building beyond the zone's coverage cap without an approved site plan or variance is a zoning violation. Alexandria's Department of Planning & Zoning can withhold or revoke a building permit, order construction halted, and require an over-built structure to be reduced or removed; a property owner seeking relief from the coverage limit must apply to the Board of Zoning Appeals for a variance rather than proceed without approval.

Structure Height Limits

Like lot coverage, Alexandria's maximum building height is set zone by zone rather than citywide. In the R-20 single-unit residential zone, the city's lowest-density district, Section 3-106(C) caps structures at 30 feet, rising to 40 feet only for a place of worship or school use on the same lot.

Key details: R-20 zone height cap: 30 feet (40 ft for worship/school). RT zone height cap: 35 feet (§ 3-1306(D)). Height districts: 6 citywide districts set separate maximums (§ 6-401). Conflict rule: Lowest applicable height limit governs (§ 6-402). Height-to-setback ratio: Height ≤ 2x distance to street centerline (§ 6-403(A)).

Building above the applicable zone height or height-district maximum without a special use permit or approved exception is a zoning violation. Alexandria's Department of Code Administration and Department of Planning & Zoning can refuse to issue a certificate of occupancy, require a noncomplying structure to be reduced, and treat an unpermitted overheight building as illegal construction subject to the ordinance's nonconforming-structure enforcement provisions.

Setback Rules

Alexandria sets yard setbacks zone by zone using ratios rather than flat numbers. In the R-20 single-family zone, Zoning Ordinance Section 3-106 requires two side yards on a 1:2 setback ratio with a 12-foot minimum, a rear yard on a 1:1 ratio with a 12-foot minimum, and a front yard matching the surrounding block face.

Key details: R-20 side yards: 1:2 ratio, 12-foot minimum each. R-20 rear yard: 1:1 ratio, 12-foot minimum. R-20 front yard: Matches block-face range, capped at 40 ft need. Duke St setback: 60-75 ft from centerline (§7-1006(B)). Beauregard St setback: 80 ft from centerline (§7-1006(E)).

Building or maintaining a structure inside a required yard is a yard-regulation violation under Section 11-207(A)(3), a class five civil violation: $200 for the first offense and $500 for each later violation of the same requirement arising from the same facts, capped at $5,000 for a repeated series, with each day the encroachment exists counting as a separate offense (no more than once per ten-day period). The director may order the offending structure removed or altered under Section 11-204 before pursuing court action.

The Bottom Line

Alexandria's building setbacks & zoning 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 Alexandria is broadly strict or permissive.

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