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Chesterfield County, VA Accessory Structures: ADU Rules (2026)

Some Restrictions

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

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

Key Facts

By-right ADU: Not allowed
Approval path: Conditional Use Permit
Accessory size cap: Not over primary dwelling
Building code: Virginia USBC applies
Decided by: Board of Supervisors

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 Chesterfield County, VA rules below cover local size, height, and setback requirements.

Summary

Chesterfield does not allow a separate accessory dwelling by right. Using an accessory building as a dwelling generally requires a Conditional Use Permit approved by the Board of Supervisors. Accessory buildings themselves may not exceed the primary dwelling's square footage. Virginia has no statewide by-right ADU mandate.

These county ordinances apply to unincorporated areas of Chesterfield County. Incorporated cities within the county may have their own rules that take precedence over county-level regulations.

In R and MH-2 Districts, the gross square footage of all accessory buildings on a lot shall not exceed the gross square footage of the primary dwelling, excluding any basement.

View official code

Full Breakdown

Under the county Zoning Ordinance an accessory building's gross floor area may not exceed that of the primary dwelling (Sec. 19.1-304.A.1), and its height cannot exceed half the principal building's height or 25 feet. Establishing a true second or accessory dwelling unit (in-law suite) is not permitted by right; owners must obtain a Conditional Use Permit, which the Planning Commission and Board of Supervisors review at public hearing, a process taking several months. The county provides an Accessory Dwelling Unit worksheet for these applications. Any ADU must also meet the Virginia Uniform Statewide Building Code and district setbacks. Confirm current standards with Chesterfield Planning before building.

Violations & Fines

Occupying an unpermitted second dwelling, or building an ADU without the required Conditional Use Permit and building permits, is a zoning violation subject to enforcement, stop-work orders and civil penalties.

Frequently Asked Questions

Can I add an in-law suite in Chesterfield?

Yes, but a detached or separate accessory dwelling generally requires a Conditional Use Permit approved by the Board of Supervisors, plus building permits and compliance with setbacks.

How big can an accessory building be?

Its total gross square footage cannot exceed that of the primary dwelling, excluding basement, and its height cannot exceed half the principal building's height or 25 feet.

Sources & Official References

Other rules in Chesterfield County

Parking Rules: Street Parking LimitsSome Restrictions Animal Ordinances: Dog Leash LawsSignificant Restrictions Shed & Carport RulesSome Restrictions Garage ConversionsSome Restrictions Noise Ordinances: Leaf Blower RulesSome Restrictions Parking Rules: Commercial & Oversized VehiclesSome Restrictions Fence Regulations: Retaining WallsSome Restrictions Animal Ordinances: Cat RulesSome Restrictions

All Chesterfield County rules

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

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