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Richmond, VA Accessory Structures: ADU Rules (2026)

Some Restrictions

Compiled from the official code textEditor Martyn O'NeillLast verified August 2026

ADU rules in Richmond, VA, also called accessory dwelling unit regulations or granny flat ordinances, cover setbacks, owner-occupancy, parking, and permit requirements.

Key Facts

ADUs permitted per lot: One accessory dwelling unit per single-family lot
Size cap: Greater of one-third main house floor area or 500 sq ft
Governing section: Richmond City Code § 30-402.2(13)
Accessory building height limit: 20 feet citywide, Sec. 30-680.4
Access approval required: Public Works and Fire/EMS sign-off on access
Zoning violation penalty: Up to $1,000 fine under Sec. 30-1080

ADU Eligibility Quick-Check

An Accessory Dwelling Unit (ADU) is a smaller, independent living unit on the same lot as a single-family home: converted garages, detached cottages, basement or attic conversions, and attached additions all qualify. Most states have streamlined ADU permitting since 2020, but local rules still control size, height, and setback.

Is your lot zoned single-family or multi-family residential?
Does your lot have at least 1,200 sq ft of buildable space?
Is your existing home owner-occupied (in most states this is not required, but some require it for ADU permits)?
Will the ADU stay under your state's size cap (commonly 850-1,200 sq ft for detached)?
Can you provide one off-street parking space (waived in many states within 0.5 mi of transit)?

If you answered 'yes' to most of these, you likely qualify in Virginia under recent ADU streamlining laws. The Richmond, VA rules below cover local size, height, and setback requirements.

Summary

Richmond permits one accessory dwelling unit per single-family lot, but caps it at one-third of the main house's floor area or 500 square feet, whichever is greater. City Code § 30-402.2(13) routes ADU structures through the accessory-building standards in Article VI, Division 9, and requires access sign-off from both the Department of Public Works and the Department of Fire and Emergency Services before occupancy.

(13)One accessory dwelling unit located on the same lot as a single-family dwelling, provided that:a.The accessory dwelling unit cannot exceed one-third of the floor area of the main single-family dwelling or 500 square feet, whichever is greater.b.An accessory building with an accessory dwelling unit shall be subject to the requirements of Article VI, Division 9 of this chapter.c.Access to an accessory building with an accessory dwelling unit shall be provided in accordance with requirements of the Department of Public Works and Department of Fire and Emergency Services. (Code 1993, § 32-402.2; Code 2004, § 114-402.2; Code 2015, § 30-402.2; Code 2020, § 30-402.2; Ord. No. 2004-180-167, § 1, 6-28-2004; Ord. No. 2012-74-84, § 1, 6-11-2012; Ord. No. 2013-47-47, § 1, 4-8-2013; Ord. No. 2019-343, § 1(30-402.2), 6-22-2020; Ord. No. 2020-171, § 1(30-402.2), 9-28-2020; Ord. No. 2023-196, § 1, 9-25-2023; Ord. No. 2024-314, § 2(30-402.2), 12-9-2024)

Source: Richmond ZoningView official code

Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Recodification).

Full Breakdown

Sec. 2 counterparts. The ADU's floor area is capped at whichever is larger: one-third of the main dwelling's floor area, or 500 square feet, which keeps a garage apartment or backyard cottage subordinate to the primary house rather than becoming a second full-size home. Because an ADU sits inside an accessory building, it also has to clear Article VI, Division 9's general accessory-building rules. Sec. 1 limits an accessory building to 12 feet in height if it sits inside a required rear yard, or the rear 30 feet of a side yard in the R-6, R-7, R-8, R-48, R-53 and R-63 districts, and keeps it at least five feet off any alley.

Sec. 4 sets a citywide ceiling of 20 feet for any accessory building on a single- or two-family lot and caps the combined footprint of all accessory buildings on the lot at no more than the footprint of the main house. Sec. 2(13)(c) additionally requires the owner to route access to an ADU-containing accessory building through both the Department of Public Works and the Department of Fire and Emergency Services, since these buildings often sit on alleys rather than the street frontage the main house uses.

Sec. 3 bars occupying any accessory building, ADU included, until construction of the main house is complete and a certificate of occupancy has been issued for it.

Violations & Fines

Building or occupying an oversized ADU, or one that skips the Public Works and Fire and Emergency Services access sign-off, violates Sec. 30-402.2(13) and is enforced as a zoning violation under Sec. 30-1080. A first conviction is a misdemeanor punishable by up to a $1,000.00 fine; if the ADU is not brought into compliance, each following ten-day period is a separate offense carrying fines up to $2,000.00, plus a $100.00 administrative enforcement fee.

Frequently Asked Questions

How big can a Richmond ADU be?

Sec. 30-402.2(13) caps it at one-third of the main single-family dwelling's floor area or 500 square feet, whichever number is larger. An accessory building holding the ADU also can't push the combined footprint of all accessory buildings on the lot past the footprint of the main house, per Sec. 30-680.4.

Does a Richmond ADU need its own driveway or street access?

Not necessarily. Sec. 30-402.2(13)(c) requires access to an accessory building containing an ADU to meet standards set by the Department of Public Works and the Department of Fire and Emergency Services, since many of these units sit on rear lots served by alleys rather than the main street frontage.

Can I build or live in an ADU before the main house is finished?

No. Sec. 30-680.3 bars using or occupying any accessory building, including one with an ADU, until construction of the main single-family dwelling is complete and the City has issued a certificate of occupancy for that main house, so the ADU cannot be built or lived in first.

Sources & Official References

[1]Richmond City Code § 30-402.2 - Permitted accessory uses and structures

Other rules in Richmond

Parking Rules: Street Parking LimitsSome Restrictions Fence Regulations: Height LimitsSome Restrictions Shed & Carport RulesSome Restrictions Parking Rules: RV & Boat ParkingSome Restrictions Tiny HomesSignificant Restrictions Noise Ordinances: Barking DogsSome Restrictions Noise Ordinances: Leaf Blower RulesSome Restrictions Animal Ordinances: Wildlife FeedingSignificant Restrictions

All Richmond rules

How Richmond compares: Easiest Cities to Build an ADU·Compare Richmond to another location·View the Virginia accessory structures overview

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