DC grading work is regulated under the DC Construction Codes (12-A and 12-G) and requires a Department of Buildings Excavation and Sheeting & Shoring permit for any excavation. Grading must not redirect runoff onto neighboring properties. Retaining walls over 4 feet require engineering sealed drawings. DOEE SESC and stormwater rules stack on top of DOB permits.
Grading and site drainage in DC are regulated through multiple overlapping codes: the 2017 DC Building Code (12-A DCMR) and Residential Code (12-B) contain Chapter 18 grading, drainage, and excavation provisions; the DC Existing Building Code (12-I) covers alterations; and 21 DCMR 5 (stormwater) and 21 DCMR 540 (erosion) impose additional requirements. Any excavation deeper than 5 feet requires a Sheeting and Shoring permit from DOB. Grading that moves more than small amounts of earth triggers a Grading permit. Finished grade must direct surface water away from buildings (minimum 5% slope for 10 feet per IRC) and must not cause water to flow onto neighboring properties (the common-law 'reasonable use' rule is codified in DC Code 42-3131 property maintenance and in tort law). Retaining walls over 4 feet from the bottom of footing to top of wall require engineering design sealed by a DC-licensed Professional Engineer and a separate permit. Structural fill must be compacted to 95% Modified Proctor with testing documented. Basement excavations in row house blocks require careful party-wall underpinning and neighbor notification, and disputes frequently end up before the Board of Zoning Adjustment or in tort litigation over subsidence damage. Retaining walls near public space require DDOT permits as well. Persistent drainage problems can trigger DOB Housing Regulation cases.
Unpermitted grading: stop-work, $500-$5,000 under DCMR 12-A 18. Drainage onto neighbor: civil tort exposure plus $1,000-$5,000 DOB fine. Retaining wall over 4 ft without engineering: $2,500+ and order to remove/redesign. Excavation without S&S permit: $5,000+ plus stop-work.
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