Building permits in Loudoun County are issued by the county’s Department of Building and Development, whose permitting counters are on the second floor of the Government Center at 1 Harrison Street SE in Leesburg. The department issues building permits for the entire county, including its seven incorporated towns.
This guide covers the department and how to reach it, the local conditions that survive state preemption, what permits cost and who may pull them, and how inspections are booked. Rules that apply everywhere in Virginia are summarized in each section, with a link to the full statewide explanation.
This guide covers work anywhere in Loudoun County, including its seven towns.
Seven incorporated towns sit inside Loudoun County, and the county issues building permits in all of them. A Virginia town stays part of its county. The towns handle their own zoning permits, but building permits for work in a town come from Loudoun County Building and Development.
What requires a permit in Loudoun County?
The Loudoun County Department of Building and Development issues building permits for work anywhere in Loudoun County, including its seven towns.
Permit required
- New residential and commercial construction, additions and remodels
- Structural alterations, relocation and demolition
- Electrical service changes, panel work and new circuits
- Plumbing, gas piping, water heaters and fixture work
- Mechanical installations and equipment replacements
- Solar photovoltaic systems and battery storage
- Re-roofing and re-siding, except on houses and townhouses where the design wind speed is 100 mph or less
- Renovation or demolition of a pre-1985 building, with asbestos certification first
Typically exempt
- Purely cosmetic finish work that alters no regulated system
- Ordinary repairs the USBC lists: same-size window and door replacement, replacing plumbing fixtures without altering the piping, and replacing switches, receptacles, light fixtures and ceiling fans in homes
- One-story sheds and playhouses of 256 square feet or less, fences other than pool barriers, and retaining walls holding back less than 3 feet of fill
- Farm buildings and structures, which § 36-99 exempts from the code
- Other work the building official deems minor and ordinary that does not affect public health or safety
Loudoun’s local conditions that survive state preemption under § 36-98 include the Airport Impact Overlay District around Washington Dulles International Airport, which limits residential development where aircraft noise is highest (the map adopted on 17 January 2023 affects about 59,000 properties), and the county’s historic districts, among them the Historic and Cultural Conservation Districts at Aldie, Taylorstown and Waterford.
Short on time to read all of this?
Get a free quote →Loudoun County enforces Virginia’s Uniform Statewide Building Code, 2021 edition, in effect since 18 January 2024. No Virginia locality can adopt its own building code or amendments, so what varies locally is zoning conditions, historic districts and flood plain rules. How Virginia’s statewide code works
Who handles permitting in Loudoun County?
There are seven incorporated towns inside Loudoun: Leesburg, Purcellville, Middleburg, Hamilton, Hillsboro, Lovettsville and Round Hill. Unlike an independent city, a Virginia town remains part of its county.
Building and Development issues building and grading permits for the entire county, towns included, and zoning permits only for properties outside the towns; the towns issue their own zoning permits. The state’s directory of building officials lists every Loudoun town under the county. Leesburg, the largest town, had 49,917 residents in the Census Bureau’s 2025 estimate.
The county describes itself as home to the world’s largest concentration of data centers, and it also has working farmland. Farm buildings and structures are exempt from the building code under § 36-99, with limits. A farm building operated as a licensed restaurant is not exempt. Exempt farm buildings in a flood plain or mudslide-prone area remain subject to flood-proofing and mudslide regulations. And a farm building where the public is invited in for agritourism, and where farm products are displayed, sampled or sold, must have fire extinguishers, a written emergency plan, and a posted sign of at least 24 by 36 inches stating that the building is exempt from the Uniform Statewide Building Code — with black letters at least an inch high, placed near the entrance.
Filing runs through LandMARC, the county’s land management system.
| Detail | Information |
|---|---|
| Authority | Loudoun County Department of Building and Development |
| Phone | 703-777-0220 |
| Permitting counters | 1 Harrison Street SE, Second Floor, Leesburg, Virginia 20175 |
| Published hours | Monday–Friday 8:30 a.m.–5 p.m. |
| Plan review and inspections | 1503 Edwards Ferry Road NE, Suite 300, Leesburg, Virginia 20176 |
| Portal | LandMARC |
| Towns inside the county | Leesburg, Purcellville, Middleburg, Hamilton, Hillsboro, Lovettsville, Round Hill |
| Governing code | 2021 Virginia Uniform Statewide Building Code |
| Appeals | Local Board of Building Code Appeals, then the state Review Board |
In 2025, building permits issued in unincorporated Loudoun County authorized 1,407 new privately owned housing units, 580 of them single-family homes, according to the U.S. Census Bureau Building Permits Survey.
Not sure this scope needs a permit?
Get a free quote →State-owned buildings, and buildings on state-owned property, are permitted by the Virginia Department of General Services rather than Loudoun County (§ 36-98.1). State-owned projects in Virginia
Permit types
Residential permits
| Work | Permit |
|---|---|
| New single-family dwelling | Building permit, plus trade permits for each system |
| Addition or structural alteration | Building permit; existing building code provisions apply |
| Interior remodel touching a system | Building permit plus the relevant trade permits |
| Deck, porch or accessory structure | Building permit, except one-story sheds and playhouses of 256 square feet or less; zoning setbacks checked separately |
| Re-roofing and re-siding | No permit on houses and townhouses where the design wind speed is 100 mph or less; otherwise a building permit (in a historic district the building official may require one) |
| Solar photovoltaic and battery storage | Building and electrical permits |
| Demolition | Demolition permit; asbestos certification first on pre-1985 buildings |
The permit is a lien document in Virginia
On a one- or two-family dwelling, Loudoun County’s building department prints the mechanics’ lien agent on the permit itself. Virginia Code § 36-98.01 requires that a building permit issued for any one- or two-family residential dwelling unit contain, at the time of issuance and at the applicant’s request, the name, mailing address and telephone number of the mechanics’ lien agent as defined in § 43-1. If the applicant does not request a designation, the permit must state, in those words, “None Designated.”
Commercial permits
| Work | Permit |
|---|---|
| New commercial construction | Building permit with full plan review |
| Tenant fit-out or change of use | Building permit; occupancy classification drives scope |
| Structural or facade alteration | Building permit under the existing building code |
| Fire protection and sprinkler systems | Permit required |
| Mechanical, electrical and plumbing | Trade permits by classification-licensed firms |
| Elevators and conveyances | Inspected and enforced by the locality (§ 36-105) |
| Signage | Building permit unless exempt under Appendix H of the construction code; zoning approval is separate |
Rather talk it over?
Call 1-855-478-4290 →Pre-1985 buildings: a hard permit prerequisite
Statewide rules also shape every Loudoun County filing: the permit records the mechanics’ lien agent designation on one- and two-family dwellings, buildings first permitted before 1985 need asbestos certification before renovation or demolition, annual permits and code modifications are available, and single-family construction drawings are exempt from FOIA disclosure. Virginia rules that shape a submittal
Loudoun County permit costs and fees
Permit fees in Loudoun County are set locally and may fund only the building department (§ 36-105). A 2.0 percent state levy is collected on local permit fees (USBC Section 107.2), and inspection may be waived on work costing under $2,500. Take plan review charges from the current adopted fee schedule for Loudoun County. How Virginia permit fees work
Rather not deal with the Loudoun County building department?
Get a free quote →Trade permits and who may pull them
Trade permit required
- Electrical work, by a firm holding the electrical classification
- Plumbing and gas piping, by a firm holding the plumbing classification
- Mechanical and HVAC work, including equipment changeouts
- Fire protection and sprinkler work
Usually no trade permit
- Replacing plumbing fixtures without altering the supply, drainage or vent piping
- Replacing a mechanical appliance that does not burn gas or oil, in a home
- Wiring under 50 volts, such as thermostats, unless it is part of a fire alarm or other life-safety system
- Replacing switches, receptacles, light fixtures and ceiling fans in homes
Virginia’s contractor licence is held by the business: the Board for Contractors issues Class A, B or C licences with trade classifications, individual tradesmen hold separate tradesman licences, and a permit cannot issue without the required state licence or a written statement of exemption (§ 54.1-1111), plus proof that the locality’s license taxes are paid. Virginia contractor licensing
How to apply for a Loudoun County building permit
The county issues the building permit either way, but inside the seven towns the zoning permit comes from the town.
Historic district rules survive state preemption under § 36-98.
Airport overlay land use requirements survive state preemption and apply around Washington Dulles International Airport.
Section 36-99 exempts farm buildings, but not licensed restaurants, not floodplain flood-proofing, and agritourism buildings carry posting requirements.
Have the contractor licence and, on one- and two-family work, the mechanics’ lien agent decision ready at filing.
The county inspects building work throughout Loudoun, towns included.
If Loudoun County denies an application it must explain the reasons in writing (§ 36-105), and a full re-review of the resubmission is lawful. Appeals go to the local Board of Building Code Appeals before the State Building Code Technical Review Board. Denials, corrections and appeals in Virginia
Inspections in Loudoun County
Building and Development schedules inspections throughout the county, towns included, with inspection requests and permit records in LandMARC.
Loudoun County enforces the 2021 Statewide Fire Prevention Code itself, and fire protection systems need a separate Fire Marshal permit, applied for through LandMARC.
Want this handled start to finish?
Get a free quote →Statewide rules also apply: the permit must be posted and the approved plans kept on site, a stop work order must state the violations and the conditions for resuming work (§ 36-97), and code violations carry penalties under § 36-106. Inspections and enforcement in Virginia
Loudoun County permit search and official resources
These are the primary sources behind this guide. Codes, fee schedules and portal procedures change, so confirm the position for your filing date.
- Loudoun County Building and Development
- Loudoun County permitting: building permits for the entire county
- Virginia Uniform Statewide Building Code (DHCD)
- Virginia DHCD building codes and regulations
- Code of Virginia § 36-98, statewide code supersedes local codes
- Code of Virginia § 36-98.01, mechanics’ lien agent on the permit
- Code of Virginia § 36-105, enforcement, appeals and permits
- Code of Virginia § 36-99.7, asbestos inspection before renovation or demolition
- Virginia DPOR Board for Contractors
Frequently asked questions
Is Leesburg permitted by Loudoun County?
Yes, for building permits. Leesburg is an incorporated town inside the county, and Loudoun County Building and Development issues building permits for the entire county, Leesburg included. The Town of Leesburg issues its own zoning permits.
Inspections are where schedules slip.
Get a free quote →How do towns differ from independent cities in Virginia?
A town stays part of its county; an independent city is not in any county at all. So a county building department has no jurisdiction inside an independent city.
Are farm buildings really exempt from the building code?
Yes, under § 36-99 — but with limits. A farm building operated as a licensed restaurant is not exempt, exempt buildings in a flood plain remain subject to flood-proofing regulations, and a farm building where the public is invited in for agritourism and farm products are displayed, sampled or sold must have extinguishers, a written emergency plan and a posted exemption sign of at least 24 by 36 inches.
Which building code applies in Loudoun County?
The 2021 Virginia Uniform Statewide Building Code. Under § 36-98 the statewide code supersedes local building codes, so the county does not adopt its own edition — what varies locally is zoning, proffers, overlay districts, historic districts and floodplain rules.
Does the Dulles airport overlay affect my permit?
It can. Land use requirements in airport overlay districts are expressly preserved from state preemption under § 36-98, so they apply independently of the building code and are administered locally.
What portal does Loudoun use?
LandMARC, the county’s land management system, carries permit applications, inspection requests and permit records for work throughout the county.
Simplify Loudoun County permitting with Alliance Permitting
In Loudoun the local questions are town zoning, the Dulles airport overlay, historic districts and the limits of the farm building exemption. Alliance Permitting prepares, files and tracks Loudoun County permits through issuance.
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- We confirm whether a parcel needs a town zoning permit before filing.
- We check the Dulles airport overlay for the parcel.
- We test farm building exemptions against the actual limits in § 36-99.
- We keep licence classification and lien agent designation correct at intake.
Alliance Permitting is a permit documentation and expediting service in Virginia. We are not a law firm and do not provide legal advice, and we are not the permitting authority.
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More Virginia permitting guides
This guide is provided by Alliance Permitting for general information about Loudoun County permitting. Requirements, fees, and procedures change; confirm details with the permitting authority before relying on them.