04/03/2026
QUESTION: In Arlington, VA, if you purchase a home, that was legally a single family home, but the owner, who is now dead, converted into a triplex, without a PERMIT or a Certificate of OCcupancy, is it possible to apply for a Certificate of Occupancy, and make it legal?
ANSWER: This is a great question with several layered issues. Here's a thorough breakdown — though keep in mind I'm not a lawyer, and given the complexity here, you'd really want to consult a real estate attorney and possibly a zoning specialist before purchasing.
The Short Answer: It's Possible, But Complicated
Whether you can legalize this unpermitted triplex depends on two separate hurdles — zoning and building code — and both must be cleared.
Hurdle 1: Zoning — Is a Triplex Even Allowed?
This is the threshold question. If the property sits in a single-family residential zone, a triplex may simply not be a permitted use, and no amount of building permits will fix that. Arlington went through a dramatic attempt to change this. Arlington County introduced its "Missing Middle" housing policy to increase housing diversity and affordability, allowing triplexes and other multi-unit buildings in areas previously restricted to single-family homes.
However, on September 27, 2024, a Virginia Circuit Court Judge invalidated Arlington's "Missing Middle" zoning policy, which had allowed for the by-right construction of up to six dwelling units on properties in districts zoned for single-family residential dwellings.
The saga continued: the Arlington Circuit Court struck down the policy on Sept. 27, 2024, but then partially stayed its order on Oct. 25, 2024. On June 24, 2025, the Virginia Court of Appeals overturned the circuit court's decision invalidating the ordinance. Then on July 8, 2025, the Virginia Court of Appeals set aside its own ruling and granted a rehearing, making the EHO ordinance void again — at least temporarily.
Bottom line on zoning: As of early 2026, the status of Arlington's Missing Middle ordinance remains in legal limbo. Whether a triplex is permissible in a given single-family zone depends on the specific zoning district and the current state of that litigation. You must verify the zoning of the specific parcel before proceeding.
Hurdle 2: Building Code — The Unpermitted Work Problem
Even if zoning allows a triplex, you face a major building code issue as the new owner. If you purchase property where building code violations exist, you become legally responsible for correcting whatever the building code deficiencies are. The previous owner's death does not erase those violations — they transfer with the property.
Importantly, unpermitted work is considered new work and must comply with the code in effect at the time of permit issuance — not the code from when the work was originally done. The building code makes no reference to "grandfathering" of unpermitted work.
This means if you apply to legalize the conversion, the work will be evaluated against current building codes, which for a triplex would include requirements for fire separation, egress windows, separate utility systems, structural loads, electrical, plumbing, and more. Walls may need to be opened up for inspection. Costly upgrades are very common.
The Path to Legalization (If Zoning Allows It)
If the property's zoning permits a triplex (or you can obtain a variance/special use permit), the general process would be:
Confirm zoning compliance — Contact Arlington County's Zoning Division to determine whether a triplex is permitted on that specific lot given the current state of the EHO litigation.
Hire a licensed architect or contractor — They would assess what was done and what would need to be brought up to code.
Apply for retroactive building permits — Through Arlington's Permit Arlington portal, you'd apply for building, electrical, plumbing, and mechanical permits.
Pass inspections — All unpermitted work must be inspected and meet current Virginia Uniform Statewide Building Code standards. Unpermitted work can lead to fines, legal issues, and safety hazards. Proelectricva
Apply for a Certificate of Occupancy — A Certificate of Occupancy ensures that a building or a proposed use of a building/land complies with all state building code regulations and County laws. Arlington County Virginia Once inspections pass, the CO can be issued.
Key Risks to Know Before Purchasing
If zoning doesn't allow a triplex, you could be forced to de-convert the property back to a single-family home at your own expense.
The cost of bringing unpermitted work up to current code can be very significant — sometimes more than the value gained.
Lenders and title insurers may have complications with a property in this status.
If tenants are currently in the units, eviction and habitability laws could apply immediately upon purchase.
The strong recommendation is to hire a Virginia real estate attorney with land use experience before closing, and have them conduct due diligence directly with Arlington County's Zoning and Building divisions. Given the ongoing litigation around multi-family zoning in Arlington, the legal landscape is genuinely unsettled right now.
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