Can you build a multiplex in Arlington, VA? Yes today, but the rule keeps going to court.

Yes, as of July 2026 you can apply for an Expanded Housing Options (EHO) permit and the County is processing those applications. EHO lets you build 2 to 6 homes on a lot that used to allow only one detached house. But there is a real legal risk you must understand first. The rule that makes this legal is still being challenged in court, and the Virginia Supreme Court agreed in May 2026 to review the case. The rule is in effect today, but its long-term future is not fully settled.

The official name is Expanded Housing Options, or EHO. Most people call it "Missing Middle" because it fills the gap between a single house and a large apartment building: think duplexes, triplexes, fourplexes, and up to six homes in one house-scale building. The Arlington County Board adopted EHO on March 22, 2023 by a unanimous vote, and applications opened on July 1, 2023. It applies countywide to lots that were zoned for single-detached houses.

Between 2 and 6 homes, but the exact number depends on your lot size. Larger lots, generally above about 6,000 to 7,000 square feet, can hold 5 or 6 units. Lots smaller than about 7,000 square feet are limited to 4 units or fewer. So the size of your land is the first thing that decides your ceiling. Before planning, confirm your exact lot area, because it sets whether you are looking at a duplex or a full sixplex.

As of July 2026 EHO is in effect, and Arlington resumed processing EHO permits around October 2025. But the honest answer is more complicated than a simple yes. Since 2024 the rule has been declared void by a court, then valid, then void, then valid again, four flips in total. It is currently valid, but the Virginia Supreme Court is reviewing the case, so the situation could change. Anyone planning a project needs to treat the legal status as unsettled, not final.

It is the lawsuit that has driven the whole legal fight over EHO. A group called Neighbors For Neighborhoods, led by named plaintiffs including Miller, sued the County to overturn the rule. Their claims were mostly procedural. For example, that the County's public notice did not clearly state it was amending the zoning ordinance, that the County improperly delegated decisions to staff, and that it skipped a required sewer-capacity review. The case has moved through the Circuit Court, the Court of Appeals, and now the Virginia Supreme Court.

On September 27, 2024, Circuit Court Judge David Schell ruled EHO "void ab initio," which is a legal term meaning "void from the very start." His reasoning was procedural, not about whether missing-middle housing is a good idea. He found the County's advertised resolution did not state it was amending the zoning ordinance, that decisions were unlawfully delegated to staff, that no sewer-capacity review was done, and that a tree standard was not met. That ruling froze all EHO permits until it was reversed on appeal.

Because the appeals process itself changed direction more than once. In June 2025 the Court of Appeals reversed the lower court and revived EHO, saying the plaintiffs had failed to name required parties: the developers who already held EHO permits. Then in July 2025 that same court withdrew its own opinion and granted a rehearing, which voided EHO again. In September 2025 the court returned to its original position and revived EHO once more. Each step turned on procedure, which is why the rule flipped back and forth without anyone ruling on whether it is fundamentally sound.

This is a key point that is easy to misread. On May 19, 2026 the Virginia Supreme Court agreed to hear the case, but it is reviewing only the narrow procedural question of whether the right parties were named in the lawsuit. It is NOT reviewing whether the EHO rule itself is valid or good policy. So even a full win or loss on this specific question may not settle the deeper fight for good. A final decision could take up to a year, which means the uncertainty may continue well into 2027.

The risk is that the rule you built under could later be challenged again, and the courts have already shown they will freeze permits when that happens. During the September 2024 freeze, projects in progress were stalled. If you buy a lot, demolish a house, and start building based on EHO, a future ruling could disrupt your timeline, your financing, or your ability to finish or sell. This does not mean you cannot build, and many owners are, but you should go in with your eyes open, budget for delay, and get local legal and permitting advice specific to your lot before you commit money.

The numbers are still small on purpose. Before the September 2024 freeze, the County had approved 45 EHO permits, including 12 demolition permits and 7 building permits. The County's 2025 data report projected roughly 132 net new units over time, and as of May 2026 there were about 59 EHO projects on the County's dashboard. These figures are reported by ARLnow, Arlington Magazine, and YIMBYs of NoVA based on County data. The pace is slow, partly by design and partly because of the legal pauses.

Yes. The County set an annual cap of 58 EHO permits per year for the first five years, through 2028. This cap was a deliberate choice to keep the change gradual and to let the County watch the effects before allowing more. It means EHO was never going to flood Arlington with new buildings quickly. Even in a year with strong demand, the number of new EHO projects is limited by this ceiling.

Yes, but the amount is reduced near transit. Within about three-quarters of a mile of a Metrorail station, or about half a mile of premium transit, you need only 0.5 parking spaces per unit. Everywhere else you need 1 space per unit. So a lot near a Metro station carries a lighter parking burden, which frees up land for the building. Because parking rules directly affect how many homes fit, checking your distance to transit is an early and important step.

Arlington sits between the biggest and the most cautious reforms. Like Minneapolis, it ended single-family-only zoning, but Arlington allows up to six homes where Minneapolis allowed three. Unlike California's SB 9, which mostly stayed "legal on paper" with little built, Arlington paired its rule with a permit cap and clear built-form limits. What makes Arlington unusual is not the policy. It is the legal chaos. Few reforms anywhere have been voided and revived four times, which makes Arlington a live test of whether a good rule can survive a determined court challenge.