Building permits in Loudoun County — Virginia's fastest-growing large county — are issued by the Department of Building & Development. Applications are submitted through the LandMARC portal. Loudoun County enforces the 2021 VUSBC.
This guide covers permit requirements, LandMARC, plan review, fees, trade permits, and inspections in Loudoun County.
Loudoun County issues building and grading permits for the entire county, including within incorporated towns, but zoning permits for properties inside incorporated towns (Leesburg, Purcellville, etc.) are handled by those towns. HOA/POA approval may also be required.
What requires a building permit in Loudoun County?
Under the 2021 VUSBC and Loudoun County Zoning Ordinance, permits are required before beginning construction:
Permit required
- New construction, additions, and alterations
- Structural modifications
- Reroofing, windows, siding changes
- Electrical, plumbing, and mechanical work
- Decks, pools, fences, and accessory structures
- Change of occupancy or use
- Demolition
- Grading and land disturbance
Typically exempt
- Painting, flooring, and cosmetic work
- Detached accessory structure ≤ 256 sq ft
- Retaining walls ≤ 4 ft
- Same-type fixture replacements
Exemptions are narrow and scope-specific. When unsure, confirm with the building department before starting — see the penalty note below.
Get the permit issued before starting work. Building without one exposes the owner to penalties and stop-work orders. Note that exemption from a building permit does not exempt a project from zoning requirements — confirm edge cases with the building department.
Who handles permitting in Loudoun County?
The Department of Building & Development issues building permits and grading permits for the entire county. The new LandMARC portal (replacing the former LMIS system) handles permit and land development applications, electronic plan submission, status tracking, payments, and bonds.
| Detail | Information |
|---|---|
| Office | Department of Building & Development, Loudoun County, VA |
| Phone | (703) 777-0220 |
| Online portal | LandMARC — loudoun.gov/LandMARC |
| Covers | All of Loudoun County (building & grading permits countywide; zoning outside incorporated towns) |
| Code cycle | 2021 VUSBC — effective January 18, 2025 |
| Note | Incorporated towns handle their own zoning permits |
Apply through LandMARC. The LandMARC portal (Land Management, Applications, Research, Coordination) replaced the former LMIS system. It supports electronic permit applications, plan submissions, status tracking, invoice payments, and bond management. See the LandMARC training videos and electronic plan submission guidelines on the county website.
Loudoun County building permit cost
Loudoun County permit fees are valuation-based. A mandatory 2% state levy applies to all fees.
| Fee component | How it works |
|---|---|
| Residential building permit | Valuation-based (see fee schedule) |
| Commercial building permit | Valuation-based |
| Plan review fee | Included in permit fee structure |
| Trade permits | Separate fees per trade |
| State levy | 2% on all permit fees |
| Work-without-permit | Double fees + enforcement |
Want a precise number for a specific Loudoun County project? Send us the scope and valuation and we'll return a fee estimate alongside a filing timeline.
Loudoun County trade permits
Electrical, plumbing, and mechanical permits filed separately. DPOR-licensed contractors required.
Electrical permits
Required for service upgrades, panel work, solar PV, and wiring — DPOR-licensed electrical contractor required.
Plumbing permits
Required for plumbing, repipes, water heaters, and gas work — DPOR-licensed plumber required.
Mechanical (HVAC) permits
Required for HVAC installations, changeouts, and ductwork — DPOR-licensed mechanical contractor required.
Miscellaneous & specialty
Grading permits required for land disturbance. Projects in incorporated towns need separate town zoning approval. HOA/POA approval may be needed in addition to county permits.
Verify your contractor's license. Virginia requires a state contractor license issued by the Virginia Department of Professional and Occupational Regulation (DPOR) for any project valued over $1,000. Licenses are classed by project value: Class A ($120,000+ per project), Class B ($10,000–$120,000), and Class C ($1,000–$10,000). Each class requires specific experience, education, and financial qualifications. Homeowners may perform work on their own primary residence without a contractor license, but all permits and inspections still apply. Verify licensure at dpor.virginia.gov.
How to get a building permit in Loudoun County
Confirm zoning & town requirements
Check zoning compliance. Properties within incorporated towns (Leesburg, Purcellville, etc.) need separate town zoning approval. Check HOA/POA requirements.
Register on LandMARC & apply
Create a LandMARC account. Submit the permit application with all required documentation.
Submit plans electronically
Upload construction documents through LandMARC following the electronic plan submission guidelines.
Plan review & corrections
Staff reviews against 2021 VUSBC and Loudoun County ordinances. Address comments and resubmit.
Pay fees & receive permit
Pay invoices through LandMARC including 2% state levy. Permit issued upon approval and payment.
Schedule inspections through CO
Schedule inspections. Post permit and maintain approved plans on site. Final inspection required for CO.
Inspections in Loudoun County
Schedule inspections through the Department of Building & Development. Standard checkpoints include footing/foundation, framing, rough-in MEP, insulation, and final.
Address correction notices before requesting a re-inspection; a final inspection and Certificate of Occupancy are required before legal occupancy or use.
Official Loudoun County permitting resources
- 🏛️ Loudoun County Permitting
- 💻 LandMARC portal
- 📋 Building & Zoning Permit Forms
- 📋 Issued permits report
- 🪪 VA DPOR — verify licenses
- 📘 VA DHCD — building codes
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Loudoun County's LandMARC system, rapid growth, and multi-jurisdictional zoning requirements (county + towns + HOAs) reward applicants who prepare complete packages. Alliance Permitting is a permit expediter for Loudoun County — our permit expediting services pair AI-driven document review with experts who know the Department of Building & Development process, so your Loudoun County submissions move faster.
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Alliance Permitting is a permit documentation and submission company: we prepare your paperwork, file it correctly, and coordinate with the building department through issuance — including preparing private-provider documentation where that option is available. We are not a contractor and do not perform licensed plan review or inspections; that work stays with your team and the jurisdiction.
Need a Loudoun County building permit?
Get your Loudoun County project permitted right. Alliance Permitting navigates LandMARC — so you build, not wait.
More Virginia permitting guides
This guide is provided by Alliance Permitting for general informational purposes and reflects publicly available information believed accurate as of June 2026. Permit requirements, fees, and processes change; always confirm current details with the Loudoun County Department of Building & Development before filing. This is not legal advice.