ADU Permit Requirements in Dumfries, VA
The Town of Dumfries operates its OWN Building Permits and Inspections Department and does NOT use Prince William County for building permits. Per the PWC Department of Development Services Areas We Serve page, PWC explicitly does not provide services for the Town of Dumfries, the City of Manassas, or the City of Manassas Park (PWC does serve Occoquan, Haymarket, and Quantico). All permit applications and inspections for ZIP 22026 are handled in-house by the Town. Phone (703) 221-3400: ext. 112 to schedule inspections, ext. 115 for application questions. All payments at Town Hall (17739 Main Street) by check or money order via the black drop box on the exterior wall of the main entrance: no cash, no credit/debit cards, no online payments. Electronic plan submissions accepted via email. Virginia adopted the 2021 Virginia Uniform Statewide Building Code (incorporating the 2021 Virginia Residential Code based on 2021 IRC with VA amendments) effective 2024-01-18. Confidence is medium because the Town website is a JavaScript SPA (Zite/Fillout) that does not render server-side; live URL verification confirms HTTP 200 but contact details were cross-checked against an authoritative 2024 Wayback snapshot plus PWC's official Areas We Serve documentation. No stable public PDF URL for the fee schedule was confirmed at time of research; fees referenced in the Town Document Center but only via legacy CMS links that may be stale. Local context: parts of Dumfries fall within Chesapeake Bay Preservation Area Resource Protection Area (RPA), where shed and accessory structure exemptions are reduced.
By Joey, Founder · Last verified May 22, 2026 · How we research →
When you need a ADU permit in Dumfries
VA (incorporated town in Prince William County, ZIP 22026), the Town of Dumfries Building Permits and Inspections Department issues all permits in-house at 17739 Main Street, Suite 200; Prince William County does not serve Dumfries (per PWC Areas We Serve). The Town enforces the 2021 Virginia Uniform Statewide Building Code (USBC, 13VAC5-63), which incorporates the 2021 IRC for residential, 2021 IPC, 2021 IMC, 2021 IFGC, 2017 NEC, and 2021 IECC with VA amendments. An accessory dwelling unit requires a full building permit, trade permits, and zoning approval. Whether an ADU is allowed depends on Town of Dumfries zoning (the Town has its own zoning ordinance, not PWC's); confirm use, lot size, and parking before designing. Sewer and water service through the Prince William County Service Authority (PWCSA) requires capacity confirmation. Contact (703) 221-3400 ext. 115 for application questions; no online portal.
ADU Permit Costs: Dumfries vs. Nearby
Dumfries comes in on the low side for Virginia. You're looking at $350 – $1,200 here, compared to the state average of $756 – $3,934.
| City | Estimated Fee |
|---|---|
| Dumfries | $350 – $1,200 |
| Virginia Beach | $500 – $5,000 |
| Chesterfield | $500 – $5,000 |
| Henrico | $500 – $5,000 |
Fees shown are estimates based on local building code data. Actual fees may vary based on project scope and valuation. See all Dumfries permit costs →
Zoning Considerations
ADU regulations vary dramatically by state and city. Many states (CA, OR, WA) have preemption laws that override local zoning restrictions. Check both state law and local zoning before designing.
Estimated Project Timeline in Dumfries
Here's a typical timeline for a adu project in Dumfries, VA:
Timeline is based on Dumfries's typical about 3 weeks permit processing time. Actual timelines vary by project complexity, completeness of application, and current department workload.
Need an ADU permit in Dumfries, VA?
Answer a few quick questions for a personalized answer about your specific project.
Check Now, Free →Building Department Contact
Frequently Asked Questions
Estimated permit fees for ADU projects in Dumfries, VA range from $350 – $1,200. Fees vary based on project scope and valuation.
It depends on the specifics of your project. Some smaller ADU projects may be exempt from permit requirements, while larger ones typically require a permit. Use our free lookup tool to check your specific situation.
Working without a required permit in Dumfries can result in fines, stop-work orders, being required to remove completed work, and complications when selling your home. It's always best to check first.
Typical approval time for ADU permits in Dumfries is about 3 weeks. More complex projects may take longer if plan review is required.
Learn More About ADU Permits
Read our complete guide covering permit requirements, costs, common exemptions, and the application process.
Read ADU Guide →