Virginia SB 531: Statewide ADUs Coming July 2027

Virginia just enacted the biggest change to accessory dwelling unit rules in its history: a statewide law requiring every locality to allow an ADU as a by-right accessory use in single-family neighborhoods. The catch that almost every summary buries is the calendar. The law was signed in April 2026, but it does not take effect until July 1, 2027 — roughly a year away. Between now and then, your locality's own zoning still controls, and even after the law switches on, localities keep a long list of powers: dedicated parking, owner-occupancy, a 30-day minimum lease that blocks short-term rental, a 500-foot distance rule, and size limits. Here is what SB 531 actually does, what it leaves to your locality, and why the "statewide ADUs are legal now" headline is wrong.

Bottom Line

Virginia S.B. 531, chief-patroned by Sen. Kannan Srinivasan, passed the 2026 Regular Session and became Chapter 895 of the 2026 Acts of Assembly [2]. It requires every Virginia locality to permit accessory dwelling units as a permitted accessory use in single-family residential zoning districts — a statewide by-right baseline that replaces the old patchwork where many localities allowed ADUs only through a discretionary special-use permit, or not at all [1].

Two dates define this law. It was signed by the Governor on April 13, 2026, and it carries a delayed effective date of July 1, 2027 [2]. That gap is the single most important fact in this article. As of mid-2026, the statewide right does not exist yet; it is enacted, not operative. Anyone who says ADUs are "legal statewide in Virginia now" has the timing wrong by about a year.

The by-right baseline is also not a blank check. SB 531 lets localities keep meaningful controls: they may require dedicated parking for the ADU, owner-occupancy of one of the two units, a lease term of 30 days or longer (which bans short-term rental), a 500-foot maximum distance between the ADU and the primary dwelling, and size limits down to statutory floors [1]. A locality may charge an ADU permit fee of no more than $500, but that cap sits on top of other normal fees, not instead of them [1]. And a locality that already adopted its own ADU ordinance before January 1, 2026 is exempt from the new state mandate entirely [1].

Myth	Reality
"Statewide ADUs are legal in Virginia now."	No. SB 531 / Chapter 895 was signed April 13, 2026 but has a delayed effective date of July 1, 2027. Until then, local zoning controls. [1][2]
"The $500 fee cap means an ADU permit costs $500."	No. The $500 cap is on the ADU permit fee only; it is expressly in addition to inspection, site, and building-permit fees. [1]
"Localities can't require parking or owner-occupancy anymore."	No. Localities may still require dedicated ADU parking and owner-occupancy of either the ADU or the primary dwelling. [1]
"Fairfax County (or my locality) is exempt."	There is no named-locality carve-out. The only exemption is a general one for localities that adopted an ADU ordinance before January 1, 2026. [1]
"Suffolk already passed its local by-right ADU rule."	No. Suffolk's Planning Commission recommended it 7-0 on May 21, 2026, but the City Council did not adopt it on June 17, 2026 — the ordinance remains pending. [5]

What SB 531 (Chapter 895) Actually Does

At its core, SB 531 does one structural thing: it converts ADUs from a locally optional, often discretionary use into a by-right permitted accessory use in single-family residential districts across every Virginia locality [1].

Under the prior regime, Virginia was a local-option state for ADUs. Some localities permitted them by right, many required a special-use or conditional-use permit — a discretionary process where a governing body could say no — and some effectively did not allow them at all. SB 531 sets a statewide floor: in single-family residential zoning districts, a locality must treat a conforming ADU as a permitted accessory use, which by definition means it is allowed subject to objective standards rather than a discretionary hearing [1].

That "permitted accessory use" language is the heart of the law. It is the difference between a homeowner meeting a checklist of published standards and a homeowner gambling on a public hearing where neighbors and elected officials hold a veto. Once the law is operative, a locality can still enforce objective, generally applicable standards on the ADU, but it can no longer make a conforming ADU in a single-family district contingent on winning a discretionary approval it might lose.

A note on how to cite this law, because it matters for accuracy. The enrolled bill directs that its provisions be added to the Code of Virginia "as a section numbered § 15.2-2292.3." But a different 2026 law (Chapter 406, on expedited approval and density for certain affordable housing) was assigned that same section number, creating a duplicate-numbering conflict that the Code's compilers will resolve — most likely by renumbering one of them [4]. Until that codification is finalized, the safe, unambiguous way to refer to this law is "SB 531 / Chapter 895 (2026 Acts of Assembly)", not the section number. Citing "§ 15.2-2292.3" today can point a reader to the wrong statute [4].

The Catch: It Doesn't Take Effect Until July 1, 2027

Most Virginia laws passed in a regular session take effect on July 1 of that same year. SB 531 does not. Its enactment clause states plainly that "the provisions of this act shall become effective on July 1, 2027" — a full year later than the default [1][2].

That delay is deliberate. It gives localities time to draft and adopt the local ordinance changes the state now requires, rather than forcing an overnight rewrite of local zoning. But for homeowners and buyers, the practical consequence is stark: the statewide right you have been reading about does not exist yet. Between now and July 1, 2027, whether you can build an ADU — and under what conditions — is governed entirely by your locality's current zoning ordinance, exactly as it was before SB 531 passed.

This is the trap in the "Virginia legalized ADUs" headlines. The law is real and it is on the books, but its operative date is in the future. If you are planning around it, you are planning around a right that turns on in 2027, not one you can invoke in 2026. And as with any preemption law, there will be a further lag after July 1, 2027 while individual localities update their ordinances to match the state floor. The date the right becomes enforceable is fixed; the date your specific locality's code reflects it will vary.

What Localities Can No Longer Require

Once SB 531 is operative on July 1, 2027, a locality's rules for ADUs in single-family residential districts are constrained in three important ways [1]:

No discretionary gatekeeping for a conforming ADU. Because the law makes an ADU a permitted accessory use, a locality can no longer relegate a conforming ADU in a single-family district to a special-use or conditional-use permit that a governing body can deny on discretionary grounds. Objective standards, yes; a discretionary veto, no.
No punitive setbacks. A locality may not require rear or side setbacks for the ADU that are greater than the setback required for the primary dwelling, or the setback required for accessory structures on the lot, whichever is less [1]. In other words, it cannot single out ADUs for harsher setbacks than the home or the garage already face.
No family-relationship requirement. A locality may not require any consanguinity or affinity — that is, a blood or marriage relationship — between the occupants of the ADU and the occupants of the primary dwelling [1]. The old "in-law suite only if it's an actual in-law" style restriction is off the table.

These are the specific prohibitions the statute spells out. They are narrower than some advocates hoped, which is the flip side of the long list of powers localities keep — the subject of the next section.

What Localities Can Still Require

SB 531 is a floor, not a ceiling on local control. The statute expressly preserves a substantial set of local powers. Even after July 1, 2027, a Virginia locality may still require any of the following for an ADU [1]:

A minimum lease term of 30 consecutive days or longer. This is the short-term-rental lever. A locality that adopts a 30-day floor effectively bars nightly and weekend rental of the ADU while still allowing ordinary long-term tenancy.
Dedicated parking for the ADU. The state law does not force localities to waive ADU parking; a locality may require the unit to have its own parking.
Replacement of the primary dwelling's required parking if building the ADU eliminates it. If your new ADU wipes out a space the main house was required to have, the locality can make you replace it.
Size limits on floor area, lot coverage, and impervious cover — but not below statutory floors. A locality's allowed ADU floor area must be no less than 350 square feet on lots under 2,500 square feet, and no less than 500 square feet on lots of 2,500 square feet or larger [1]. So a locality can cap size, but it cannot cap it below those minimums.
Owner-occupancy of one unit. A locality may require the owner to live in either the ADU or the primary dwelling — but not both — and may assess that requirement only at the time an application is submitted [1]. This is a meaningful limit on pure investor use, and the "at the time of application" language constrains how far a locality can push ongoing enforcement.
A 500-foot distance limit. A locality may require the ADU to be no more than 500 feet from the primary dwelling [1] — a rule aimed at keeping the ADU a genuine accessory to the main home rather than a de facto second house on a far corner of a large parcel.

Read together, these powers show the real shape of the law. SB 531 guarantees that a conforming ADU cannot be denied through discretion, but it deliberately leaves localities the objective tools — parking, occupancy, rental duration, size, and distance — to shape how ADUs actually get built.

The $500 Permit Fee — and What It Doesn't Cover

One provision that will be widely misread is the fee cap. SB 531 says a locality "may charge a fee of no more than $500" for the ADU [1]. That sounds like a promise that an ADU permit costs at most $500. It is not.

The statute is explicit that the $500 fee is in addition to any other applicable fees, including inspection, site, or building permit fees [1]. In plain terms, the $500 cap applies to the specific ADU permit fee a locality might charge — not to the ordinary building permit, plan review, inspection, and site fees that any construction project pays. Your total permitting cost for an ADU can, and generally will, exceed $500 once those standard fees are added.

The value of the cap is real but narrow: it stops localities from using a punitive, ADU-specific fee as a backdoor deterrent. It does not make ADUs a $500 proposition. Treat the $500 as a ceiling on one line item, not a budget for the whole permit.

The Grandfather Clause: Localities With Pre-2026 ADU Ordinances

SB 531 contains an important escape hatch that determines whether the new state baseline even applies to you. The statute provides that nothing in the section applies to a locality that adopted an ADU ordinance prior to January 1, 2026 [1].

This matters most in the Northern Virginia and urban localities that already moved on ADUs before the state acted. If your locality had its own ADU ordinance on the books before January 1, 2026, that local ordinance — not the new state floor — continues to govern, and the terms may be more or less generous than the state baseline. The law does not override those early movers; it leaves their existing frameworks in place.

The statute also protects work already in progress. ADU permits issued before the July 1, 2027 effective date are preserved, and local ordinances predating the effective date that "substantially comply" with the state requirements are respected [1]. The net effect is a layered map: some localities will run on their pre-2026 ordinances, some on new post-2027 ordinances built to the state floor, and homeowners will need to know which regime their specific locality falls under. The first question for anyone planning an ADU is therefore not "what does the state law say," but "did my locality already have an ADU ordinance before 2026?" — because the answer decides which rules apply.

The Bills That Didn't Make It

It is worth being precise about which 2026 bill became law, because several ADU-related bills moved through the session and only one survived. Conflating them is exactly the kind of error that produces confident, wrong citations.

The reform rode the Senate vehicle. The near-identical House companion, HB 611, did not pass — it was continued and failed to advance [3]. Two other 2026 ADU-adjacent House bills also failed: HB 509, which addressed the rental of agricultural accessory dwellings, and HB 464, which would have directed the Department of Housing and Community Development to develop a statewide ADU construction guide [3]. None of these became law.

The takeaway for anyone researching Virginia's 2026 session: the operative statewide ADU law is SB 531 / Chapter 895, full stop. If you see a reference to HB 611 as "Virginia's new ADU law," it is wrong — that bill died, and its statewide reform was enacted only through the Senate bill.

Localities Moving Early

With the state mandate not operative until July 2027, the near-term action is at the local level, where some localities are choosing to adopt by-right ADU rules ahead of the deadline. But "moving early" is not the same as "done," and the distinction matters.

The clearest example is the City of Suffolk. Its proposed ordinance amendment (OTA2026-005) would allow ADUs by right and drop the conditional-use-permit requirement in single-family districts — essentially adopting the state's future baseline early. The Planning Commission recommended approval 7-0 on May 21, 2026, and the ordinance went to the City Council on June 17, 2026 [5]. But the Council did not enact it that night; rather than adopting the ordinance, it continued the matter to a later meeting (reported as August 19, 2026). As of this writing, Suffolk's by-right ADU rule is proposed and recommended, but not adopted.

That is the state of play in mid-2026: the statewide right is still a year out, and even the localities moving ahead of it have not necessarily adopted their own rules yet. If you are counting on a specific locality's early adoption, confirm the actual Council vote and effective date — a Planning Commission recommendation is not a law.

What It Means for Homeowners vs. Investors

The practical read depends on what you are trying to do and, crucially, on when.

If you are a Virginia homeowner who wants an ADU for yourself or family, SB 531 is good news with a waiting period. Starting July 1, 2027, in a locality that did not have a pre-2026 ADU ordinance, you get a by-right path in single-family districts: a conforming ADU cannot be denied through a discretionary hearing, punitive setbacks are off the table, and no family-relationship requirement can be imposed [1]. Before July 1, 2027, none of that is guaranteed — your current local ordinance controls. So the move is to check your locality's current rules for what is possible now, and treat the state baseline as a 2027 improvement, not a present-day right.

If you are an investor, read the local controls carefully, because SB 531 preserves the exact levers that can break an investor model [1]:

Owner-occupancy. A locality may require the owner to live in the ADU or the primary dwelling. A pure two-unit rental play may not be permitted where a locality adopts that rule.
30-day minimum lease. A locality may bar rentals shorter than 30 days, which shuts down short-term/nightly rental income. If your underwriting assumes Airbnb-style rates, that assumption may not survive the local ordinance.
Dedicated parking and the 500-foot rule. Both can constrain what you can physically build on a given parcel.

None of these is guaranteed to apply — SB 531 only authorizes them — but none is prohibited either. The investor's first step is to ask the specific locality whether its ADU ordinance (current, or the one it will adopt for 2027) includes owner-occupancy, a short-term-rental floor, and dedicated-parking requirements. Get those answers before you underwrite a deal.

What To Do Before 2027

A practical sequence for a Virginia homeowner or buyer thinking about an ADU under SB 531:

Check whether your locality had an ADU ordinance before January 1, 2026. If it did, that local ordinance governs and the new state baseline does not apply to you [1]. This is the threshold question.
Read your locality's current ADU rules. Until July 1, 2027, they control regardless of the state law. Whether you can build now depends entirely on local code.
Mark the calendar: July 1, 2027. That is when the statewide by-right baseline becomes effective for localities that did not opt in early — followed by a further lag as each locality updates its ordinance.
If you plan to rent, ask three questions: Does the locality require owner-occupancy? Does it impose a 30-day minimum lease (short-term-rental ban)? Does it require dedicated ADU parking? All three are permitted by SB 531 and all three can change your economics [1].
If a local by-right ordinance is pending (as in Suffolk), confirm the actual Council adoption and effective date before relying on it — a Planning Commission recommendation is not a law [5].
Confirm the citation with your locality or counsel. Because of the duplicate section-number conflict, refer to the law as SB 531 / Chapter 895 (2026) and confirm the final codified section once it is published [4].

Frequently Asked Questions

Are ADUs legal statewide in Virginia now? Not yet. SB 531 / Chapter 895 was signed April 13, 2026, but it has a delayed effective date of July 1, 2027. Until then, your locality's current zoning controls whether and how you can build an ADU [1][2].

What does the law actually require? Once effective in 2027, every locality must permit an ADU as a by-right accessory use in single-family residential zoning districts, subject to objective local standards, rather than a discretionary special-use permit [1].

Does the $500 fee cap mean my ADU permit costs $500? No. The $500 cap applies only to a locality's ADU-specific permit fee, and it is in addition to ordinary inspection, site, and building-permit fees. Your total permitting cost will generally be higher [1].

Can my locality still require me to live on the property? Yes. A locality may require owner-occupancy of either the ADU or the primary dwelling — but not both — and may assess that requirement only at the time you apply [1].

Can I run the ADU as a short-term rental? Maybe not. A locality may require a lease term of 30 consecutive days or longer, which effectively bans nightly/short-term rental where adopted. Long-term rental is generally not barred by the statute itself, but check your local ordinance [1].

My locality already allows ADUs — does SB 531 change that? If your locality adopted an ADU ordinance before January 1, 2026, the state mandate does not apply to it, and your local ordinance continues to govern [1].

Is this the same as HB 611? No. HB 611 was the House companion bill and it did not pass. The statewide reform became law only through the Senate bill, SB 531 / Chapter 895 [3].

References

[1] Virginia General Assembly / Legislative Information System, "SB 531 — Zoning; development and use of accessory dwelling units (Enrolled, SB531ER)." Enrolled bill text establishing ADUs as a by-right permitted accessory use in single-family residential districts; the setback and consanguinity/affinity prohibitions; the local powers retained (30-day minimum lease, dedicated and replacement parking, size floors of 350/500 sq ft, owner-occupancy of one unit at time of application, 500-foot distance limit); the $500 ADU permit fee "in addition to" other fees; the pre-January-1-2026 ordinance grandfather clause; and the July 1, 2027 effective date. https://lis.virginia.gov/bill-details/20261/SB531/text/SB531ER
[2] Virginia General Assembly / Legislative Information System, "SB 531 — Bill Details and History." Official record showing chief patron Sen. Kannan Srinivasan, enactment as Chapter 895 of the 2026 Acts of Assembly, Governor's approval on April 13, 2026, and the July 1, 2027 effective date. https://lis.virginia.gov/bill-details/20261/SB531
[3] Virginia General Assembly / Legislative Information System, "HB 611 — Bill Details and History." Record showing the near-identical House companion bill was continued and did not pass; the statewide ADU reform was enacted only through SB 531. https://lis.virginia.gov/bill-details/20261/HB611
[4] Code of Virginia, "§ 15.2-2292.3." The section number the SB 531 enrolled bill directs its provisions to occupy is already assigned to a different 2026 law (Chapter 406, affordable-housing density) — a duplicate-numbering conflict pending codification, which is why this law should be cited as SB 531 / Chapter 895 rather than by section number. https://law.lis.virginia.gov/vacode/title15.2/chapter22/section15.2-2292.3/
[5] City of Suffolk, "OTA2026-005 — Accessory Dwelling Units (City Council Staff Report)." Official city record documenting the Planning Commission's 7-0 recommendation on May 21, 2026 and the City Council's June 17, 2026 vote to continue the ordinance to August 19, 2026 (not adopted). https://www.suffolkva.us/DocumentCenter/View/19013/OTA2026-005-CC-Staff-Report