Houses are expensive, and they aren’t getting any cheaper. A new Virginia law will make it easier for homeowners to build an accessory dwelling unit, such as a backyard tiny house, garage apartment, or in-law suite, on their property. Gov. Abigail Spanberger signed the measure this week, and it takes effect on July 1, 2027, according to Virginia Mercury. Once it does, homeowners will be able to build an ADU by right rather than depending on their local government to approve it.
The law is Senate Bill 531, from Sen. Kannan Srinivasan of Loudoun and Sen. Saddam Salim of Fairfax, both Democrats. The two previously introduced versions of the bill were introduced several times before it passed this year, after earlier bipartisan attempts failed. Salim said he was glad the state was moving forward with practical housing options.
Under the new rules, localities will be required to permit ADUs in areas zoned for single-family homes and to cap permit fees at $500. The law also blocks localities from imposing the large setback requirements that usually apply to bigger homes. It removes an older requirement that the people living in an ADU be related to the occupants of the main house.
That last change matters for how the units can be used. Dropping the family-relation rule means a homeowner could rent an ADU to someone who is not a relative, which opens it up as a source of rental income or lower-cost housing. Supporters have framed the law as a way to add housing supply in a state where slow or restrictive local zoning has contributed to a shortage.
What the New ADU Law Actually Changes
The core shift is from local discretion to a statewide by-right standard. Before this law, Virginians who wanted to build an ADU were at the mercy of their local government, which could deny a permit outright or set fees high enough to make a project impractical. Starting July 1, 2027, localities must allow ADUs in single-family zones and cannot charge more than $500 for the permit.
Two other provisions lower common barriers. By barring the oversized setback rules that apply to larger homes, the law removes a requirement that can make a small backyard lot unbuildable, and by eliminating the family-relation rule, it lets homeowners rent to non-relatives. The bill applies statewide, which is significant because not all Virginia localities allowed ADUs before, leaving access to depend on where a homeowner lived.
Why Virginia Passed It Now
The law arrived amid a housing supply shortage and affordability pressure that state leaders have been trying to address. ADUs have drawn interest as a way to add homes on land that already has houses on it, and as a way for families to house an aging parent or an adult child. The Virginia Mercury noted that restrictive local zoning and permitting decisions have contributed to the supply crunch and to ongoing friction between state and local governments over land use.
The bill drew support from groups that do not always line up together. Housing Opportunities Made Equal of Virginia, a fair-housing organization, called the law a shovel-ready tool, according to its policy director, Laura Dobbs. The Pacific Legal Foundation, a property-rights law firm that challenges what it calls government overreach, backed it as well, with policy counsel Jamie Cavanaugh describing it as the freedom to use your own property. The ADU measure was one of a slate of housing bills Spanberger signed this year.