Building permits, zoning and septic rules in Montgomery County, Virginia

Yes. Unincorporated Montgomery County requires building permits for new construction and building alterations, and the Building Inspections Office enforces the Virginia Uniform Statewide Building Code locally^1,2. The published residential rate is $0.22 per square foot with a $45 minimum, plus a 2% state levy and a 2% technology fee with a $10 minimum¹⁰. An eligible owner-builder may personally perform or supervise work on one owned primary residence for personal use during a 24-month period, but that contractor-licensing exemption does not waive building-code compliance⁷. Building Inspections must issue the certificate within 5 working days after final-inspection approval and a determination of compliance¹². A certificate of occupancy is required before a building is occupied or its occupancy changes, with stated exceptions for an IRC accessory structure and certain additions¹². Owner-developers using the separate licensing exemption must make a third-party purchaser a beneficiary of their contract with a licensed contractor⁷.

The Montgomery County Building Inspections Office, at 755 Roanoke St., Suite 1D in Christiansburg, handles building permits and inspections in the unincorporated county¹³. Call 540-382-5750 or email mcbuildingsinspections@montgomerycountyva.gov, and use the office's online inspection-request portal once work is underway¹³. The office recommends requesting inspections about 36 hours ahead because of workload¹³. Septic permits stay with the Health Department rather than Building Inspections¹⁴. Building Inspections is not the first stop for a new private-septic home: county procedure calls for zoning verification, a septic construction permit, zoning application and checklist approval, and then the building permit⁵. Construction subject to the statewide code may be inspected before completion and is not compliant until the inspecting authority approves it¹⁵.

Yes. Montgomery County administers zoning in unincorporated areas, where a proposed use may be allowed by right, require a Special Use Permit, or be prohibited³. Blacksburg has its own zoning ordinance; the county directs Christiansburg zoning questions to that town's government^4,16. Septic and private-well permitting remain with VDH's New River Health District⁶. Planning & GIS Services provides county zoning verification and zoning permits for dwellings, manufactured homes and additions⁵. Minimum lot size and setbacks depend on the parcel's zoning district; the published fee schedule's district categories are not a complete use table^17,18,19. For short-term tourist rentals where the operator does not live on the parcel or an adjacent parcel, A-1 allows the use by right, while RR, R1, R2, R3 and RM-1 require a Special Use Permit; VDH approval determines occupancy, and parking must stay in driveways or approved parking areas²⁰. We could not confirm a countywide minimum dwelling size; ask Planning & GIS Services at 540-394-2148 about the parcel before designing a home⁵.

The Virginia Department of Health and New River Health District provide septic site evaluation, design and permitting for Montgomery County⁶. For a dwelling, manufactured home or addition using private septic, obtain a septic construction permit before submitting the county zoning application⁵. The local office is the Montgomery County Health Department at 210 South Pepper Street, Suite A in Christiansburg, reachable at 540-585-3300¹⁴. The septic permit's bedroom or employee-occupancy limit must match the building plans, or a conditional septic permit is required³. The New River Health District also provides sewage-system construction inspections; ask the Health Department which inspections your project needs^6,14. Only about 9% of Montgomery County soils rate free of severe limitations for a conventional drain field, so establish septic feasibility before fixing the house footprint and bedroom count¹¹. If public water and sewer serve the parcel, obtain service verification from the Montgomery County PSA, Town of Blacksburg or Town of Christiansburg⁵.

We could not confirm the long-term RV or tiny-home occupancy rules for unincorporated Montgomery County⁵. County zoning controls whether a proposed use is allowed by right, needs a Special Use Permit, or is prohibited, so ask Planning & GIS Services to check the parcel before buying or placing a unit^3,5. Virginia's campground rules do not establish a general right to live permanently in an RV on private land²¹. Manufactured homes follow separate statewide placement rules and still need the county zoning and building reviews applicable to the parcel^3,22. A tiny home intended as a residence likewise needs the approvals applicable to its use, utilities and construction³. Virginia will require localities to treat accessory dwelling units as a permitted accessory use in single-family residential zoning districts starting July 1, 2027, with an ADU permit costing no more than $500²³.

1. Ask Planning & GIS Services to verify whether the proposed dwelling use is allowed on the parcel^3,5.
2. For private septic, obtain the Health Department's septic construction permit and match its bedroom limit to the house plans⁵.
3. If public water and sewer serve the parcel, obtain service verification from the applicable county or town provider⁵.
4. Submit the zoning review, site plan and building drawings; county zoning approvals generally take 1 to 2 business days after submittal⁵.
5. After zoning approval, apply to Building Inspections and pay the applicable permit fees and levies^3,24.
6. Request required inspections as work reaches each stage, allowing about 36 hours when possible¹³.
7. Pass final inspection and obtain the certificate of occupancy before moving into the home¹².

Confirm the parcel's zoning authority and whether the proposed use is allowed before buying land in Montgomery County⁴. A private well requires a written VDH construction permit before construction, alteration, deepening or abandonment; apply through the district or local health department⁸. A driveway onto a VDOT-maintained highway needs a VDOT land-use permit, and the county's family-subdivision checklist separately calls for VDOT entrance approval^9,25. Land divisions need a licensed-surveyor plat: 10 or fewer lots receive administrative review, while 11 or more require Planning Commission and Board of Supervisors review²⁶. Major subdivision review costs $300 per plat and minor review $150 per plat, each plus $20 per lot over 5; family subdivisions and boundary-line adjustments cost $50²⁴. Subdivision plats must show applicable flood zones and base flood elevations; base flood elevations must be calculated for 5 or more lots or 50 or more acres²⁵. Ask Planning & GIS Services about floodplain requirements for an individual building site, which we could not confirm⁵. Montgomery County's median property-tax bill is about $2,174 annually, with an effective rate near 0.8%¹¹.