Washington DC Home Addition Permits 2026

Washington DC home addition permit fees, plan review, and required inspections for 2026.

Washington DC Home Addition permit basics

  • Building department: DC Department of Buildings (DOB)
  • Department URL: https://dob.dc.gov
  • Permit fee typical: $400 - $3,500 permit fee
  • Plan review + approval: 10-25 business days
  • Inspections required: 6-12 inspections (footing, framing, electrical, plumbing, mechanical, insulation, drywall, final)

Washington DC Home Addition common issues

Setback compliance, FAR (floor-area ratio), structural review required, sewer/water capacity may need upgrade.

Washington DC-specific permitting context

DC DOB and DCRA have strict historic preservation review (HPRB). License + basic business license required. DC has no state taxes but has its own sales tax (6%).

Climate factors: Humid subtropical; freeze-thaw cycles; historic preservation drives material choices

District of Columbia licensing for Home Addition contractors

DC Department of Consumer and Regulatory Affairs - required: $390 (basic business license). Board: https://dcra.dc.gov.

Mechanics lien deadline in District of Columbia: 90 days from completion. Preliminary notice: Not required.

Washington DC Home Addition sales tax

District of Columbia sales tax: 6% (no local addition). Real property labor not taxable; TPP repair labor is taxable.

Verify with the DC Office of Tax and Revenue.

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