The wall you share
decides more than you think.
For DC row house buyers and owners planning work. If you live in a detached house, this page is not for you.
Who owns a party wall in DC?
Both neighbors share it. DC's building code defines a party wall as a wall that straddles or sits close to a lot line and holds up the buildings on both sides, so neither owner can change it alone. DC's rules for building on the line date to the city's first building regulations in 1791, which made the second builder pay the first for half the wall, historian Alison K. Hoagland writes.
What does DC law say about a wall that crosses the lot line?
If a wall stands less than 7 inches onto the neighbor's lot, DC law treats it as entirely the builder's wall, and the builder pays the neighbor a reasonable price for the ground (D.C. Code § 1-1325). At 7 inches or more it is a party wall, and the ground past 7 inches is paid for the same way (§ 1-1326).
Can I remove or cut into a party wall?
Not on your own. The wall holds up your neighbor's house as well as yours. Any work that changes the loads on it, such as setting new beams into it, needs a building permit and written notice to your neighbor before you apply. Removing it or cutting openings is a structural engineer's question first.
What do I need from my neighbor to renovate?
Notice, and sometimes access. DC requires notice when your project changes the loads on a party wall. It also does for excavation, for underpinning, and for work that needs access next door. The notice goes to the neighbor by certified mail before you apply for the permit, and a second notice is posted on the house for 30 days. If you need access, the neighbor has 30 days to answer. A neighbor who refuses access takes on the protective work themselves.
My neighbor is renovating. What are my rights?
You get written notice before the permit application, and you can see the plans in the Department of Buildings' eRecords. Your house has to be protected at the builder's expense, including the party wall, roof and flashing. Within 10 business days after the permit is issued, you can file a technical objection if the plans will not protect your house from structural damage.
Who pays to repair a party wall?
Usually whoever needs the work, unless a recorded party wall agreement or the deeds say otherwise. Damage from a neighbor's construction is theirs to repair: DC's code puts protection of the adjoining house at the builder's expense. Check the deed and land records for any agreement before you buy.
What should an inspection look for?
Cracks that run through both faces of the wall, water stains at the coping and in the basement, and movement where the wall meets the front and back walls. An inspector looks from the basement up. A bowed or separating party wall is a structural engineer's question, and the answer belongs in the offer, not after it.
Does a party wall change what a house is worth?
Not by itself: almost every DC row house has one or two. Condition and position move the price. An end-of-row house has one party wall and a side wall with windows, and it usually carries a premium over the same house mid-row. A failing party wall shows up as a repair in the price.
Coping, flashing, underpinning and the rest are defined in the row house dictionary.
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Send me every sale on my blockSources. D.C. Code § 1-1325 and § 1-1326. DC Department of Buildings, Neighbor Notification (12A DCMR Sections 106.2.18 and 3307). History: Alison K. Hoagland, The Row House in Washington, DC: A History (University of Virginia Press, 2023).
This page explains rules and practice; it is not legal advice. For a specific wall, talk with a DC real estate attorney or a structural engineer.