Fairfax County, Virginia Building Department 2026: Permits, Inspections & Services

First: Make Sure Fairfax County Is Your Permit Authority

This is the most important first check. Applying to the wrong jurisdiction can waste days before anyone reviews your plans.

Do You Need a Fairfax County Building Permit?

Fairfax County requires permits for far more than brand-new buildings. Remodeling, trade work and many exterior projects can trigger building, electrical, plumbing, mechanical, zoning or site approvals.

Common residential work that may not need a building permit

Fairfax County lists several common exemptions, including ordinary painting and wallpaper, kitchen cabinets and countertops, many flooring replacements, gutters, like-for-like replacement of existing windows and doors, replacement roof shingles and certain small sheds.

For example, a detached storage shed that is 256 square feet or smaller and no more than one story can fall within the County’s building-permit exemption. A retaining wall holding less than three feet of earth may also be exempt when it is not tiered and does not support an added surcharge such as a driveway.

Before purchasing materials, use Fairfax County’s official permit requirement checker.

How to Apply for a Fairfax County Building Permit

The simplest way to avoid permit delays is to do the steps in the correct order rather than opening PLUS first and trying to guess which application fits your project.

1. Confirm the property jurisdiction.
   Make sure the project is actually under Fairfax County’s building authority. If it is in the City of Fairfax, Herndon or another separate jurisdiction, use that locality’s process.
2. Check whether the work requires a permit.
   Open the County permit requirement page and match your project to the residential or commercial list.
3. Check zoning and site conditions before finalizing plans.
   Setbacks, floodplains, Resource Protection Areas, grading, land disturbance, private well/septic conditions and right-of-way work can affect the project before building review starts.
4. Choose the exact record type.
   Go to the LDS Permit Library. Fairfax uses the word record inside PLUS for permits, plans and related applications.
5. Open PLUS and create an account.
   Visit Fairfax County PLUS. First-time applicants must register before submitting most applications.
6. Complete the application and upload the required documents.
   Select the Building module and the correct record type. Enter the site, owner, applicant and contractor information and upload plans and supporting documents requested by the Permit Library.
7. Follow plan review comments carefully.
   If reviewers create an “Issue,” respond to each open comment before resubmitting corrected sheets. Pay any required resubmission fees before completing the next submission.
8. Track the application inside PLUS.
   Open the specific record, select Reports and use the Workflow Routing Slip Report when available to see review assignments and application progress.
9. Pay outstanding fees and download the issued permit.
   Once reviews are complete and required fees are paid, the permit card and approved plans become available in PLUS.
10. Keep the approved plans available and schedule inspections as work progresses.
    Do not cover work that must be inspected first.

What to Prepare Before Starting the PLUS Application

The exact package depends on the project. A deck does not need the same documents as a commercial shell building, but preparing the basics first prevents a stop-and-start application.

• Correct project address and parcel/property information.
• Property owner and applicant contact information.
• Licensed contractor information when a contractor is responsible for the work.
• Clear project description and scope of work.
• Fairfax coversheet when required by the applicable record type.
• Architectural and structural plans that meet the County’s minimum submission requirements.
• House location plat, survey or grading-plan information when required.
• Zoning or Town approval for projects where a separate approval applies.
• Permit Authorization when the applicant is neither the owner nor the licensed contractor, when required.
• Property Ownership Affidavit when County tax records do not yet reflect the current owner, when applicable.
• Well or septic documentation for projects reviewed by the Health Department.
• Engineering, energy, HVAC, structural or other certifications specific to the project.

Do not upload a generic plan package without checking the record-specific requirements. Fairfax County’s Permit Library is organized by permit type and is the best place to confirm what must accompany the first submission.

Residential, Commercial and Trade Permit Types

Residential building records

Common residential categories include new buildings, additions and alterations, miscellaneous work, demolition, retaining walls, solar projects and separate electrical, plumbing and mechanical records.

For building-code purposes, Fairfax County’s residential category generally covers detached one- or two-family dwellings and qualifying townhouses up to three stories above grade. Apartments and condominiums can be processed under commercial building requirements even though people live in them.

Electrical, plumbing and mechanical permits

If your building project also contains electrical, plumbing or mechanical work, separate trade permits may be required. Fairfax County instructs applicants to connect related trade permits to the main building permit as child records.

For residential work, electrical and plumbing permits associated with a building project can generally be created after the building permit is issued. Mechanical permits follow a similar process. Some HVAC work also requires County certifications before the final inspection.

Commercial projects

Commercial permitting can involve Building Plan Review, Zoning, the Fire Marshal, Site Review, Health Department, Wastewater and other agencies depending on the project. New commercial buildings, tenant alterations, multi-family work, commercial additions, fire-protection systems and changes in occupancy can involve multiple approvals.

For comparison with another Virginia locality, see our existing Culpeper County, Virginia building department guide. Permit systems are local, so the forms, fees and portals used in one Virginia county should never be assumed to apply in another.

Fairfax County Building Permit Fees in 2026

Fairfax County adopted an updated Land Development Services fee schedule effective July 1, 2026. The total for your project can include a base charge, permit calculation, plan review, trade permits, resubmissions or other project-specific charges.

These are selected line items, not a quote for your project. New-building fees can also depend on square footage and construction type. Plan resubmission, electrical, plumbing, mechanical, fire, site-development and other charges can change the final invoice.

For the complete current numbers, open the official July 1, 2026 LDS fee schedule PDF.

How Fairfax County Building Inspections Work

Issuance of the permit is not the end of the process. The permit holder is responsible for requesting the required inspections at the correct construction stages.

1. Open the issued permit in PLUS. Use the record that corresponds to the work being inspected.
2. Select the required inspection. Building and trade inspections must be associated with the correct permit record.
3. Request the inspection before the deadline. Fairfax County says a request for the next business day must be submitted in PLUS before 11:59 p.m.
4. Schedule related combination inspections together. When related building and trade inspections are due at the same stage, Fairfax requires them to be bundled for the same day where applicable.
5. Make sure the work is actually ready. Scheduling unfinished work can result in a failed inspection and reinspection charge.
6. Check your email the morning of the inspection. The County sends the applicant and onsite contacts a notification showing a roughly two-hour arrival window, the inspector’s name and phone number.
7. Keep the job accessible. Approved plans, applicable site plans and shop drawings should be available. Provide ladders, scaffolding or access equipment needed to inspect the work safely.
8. Review the result after the inspection. Inspection results are sent to the contacts associated with the request.

Virtual inspections

Some inspections can be performed remotely at the inspector’s discretion. When scheduling in PLUS, type the request for a virtual inspection in the Optional Comments or Instructions for your Inspector field. Be ready to use a mobile device camera and verify the project address during the inspection.

Residential Use Permit / occupancy

For residential projects requiring a Residential Use Permit, often treated as the occupancy approval, Fairfax County states that the RUP inspection request is made by email to LDSBuildingInspections@fairfaxcounty.gov no later than 12 noon on the day before the requested inspection. Include the requester’s name, phone number, property address and permit number.

Commercial occupancy uses the Non-RUP/Certificate of Occupancy process and is handled differently.

Check inspection capacity before planning your week

Fairfax County introduced a public Building Inspection Availability dashboard in 2026 showing available inspection capacity over upcoming business days. This can be useful when coordinating contractors and project sequencing. Check the County’s Land Development Metrics and inspection availability page before assuming a preferred date will be open.

Open the official building and trade inspection instructions.

Fairfax County Building Codes Used in 2026

Fairfax County enforces Virginia’s statewide building-code system rather than creating an entirely separate local construction code.

Beginning January 18, 2025, new applications and plans are required to follow the technical provisions of the 2021 Virginia Uniform Statewide Building Code (USBC). The current code set includes the applicable 2021 Virginia Construction, Residential, Existing Building, Energy Conservation, Mechanical, Plumbing and Fuel Gas codes, together with the 2020 National Electrical Code and other referenced standards.

Design professionals should use the County’s current technical guidance rather than relying only on the simplified values above, particularly for engineered structural design. See the official Fairfax County Codes and Standards page.

How to Search Fairfax County Permit Records and Status

PLUS is also useful when you are not applying for a new permit. Home buyers, owners, contractors and project managers can search current building records without starting an application.

Search current records in PLUS

1. Open PLUS.
2. Select the Building section.
3. Choose the record-search option.
4. Search using a record number, site address, parcel information, contractor information or other available criteria.
5. Open the matching record to review available application and status information.

New PLUS permit numbers generally use a record-type abbreviation, submission year and sequential number. Fairfax County notes that converted legacy records can use different formats.

Older building records

PLUS became the County’s central permitting platform on October 31, 2022. Older information may instead appear in the Land Development Information History (LDIH) system.

The County also provides a Site Records Viewer for many approved site-related plans and a Development Tracker map for active construction, recent building permits, zoning cases, comprehensive-plan activity and certificates of occupancy.

Who to Contact for a Specific Fairfax County Permit Problem

Need to speak with someone in person?

LDS staff assist walk-in customers in Room 324 of the Herrity Building at 12055 Government Center Parkway. The published hours are Monday through Thursday from 8 a.m. to 4 p.m. and Friday from 9:15 a.m. to 4 p.m. Fairfax notes that customers may not be added to the in-person queue after approximately 3:45 p.m.

You can also use the County’s Meet With Staff page to find assistance or request a meeting for a permit application or upcoming project.

Common Fairfax Permit Mistakes That Cost Time

• Using County PLUS for a City of Fairfax or Herndon project. Confirm jurisdiction before creating the application.
• Starting with the building form before checking zoning. The location, setbacks or proposed use may affect the design.
• Choosing the wrong PLUS record type. Use the Permit Library instead of guessing from similar record names.
• Uploading incomplete plans. Record-specific minimum submission rules can apply.
• Ignoring reviewer “Issues.” Open comments must be answered during a correction cycle.
• Beginning regulated work before permit issuance. Wait until the permit is actually issued.
• Failing to connect trade permits to the parent building permit. Related electrical, plumbing and mechanical permits should be associated correctly.
• Scheduling inspection before the work is ready. This can trigger a failed inspection and reinspection fee.
• Scheduling only one inspection when combination inspections are due. Fairfax requires related inspections to be coordinated at applicable stages.
• Covering work before inspection. Keep work visible until the required inspection is complete.

Fairfax County Building Department FAQs

Before You Submit

For most Fairfax County projects, the safest order is simple: confirm jurisdiction → check zoning and site conditions → identify the correct permit type → prepare the required plans → submit through PLUS → respond to review comments → pay assessed fees → download the issued permit → complete required inspections.

Doing those checks before construction begins is usually easier than trying to correct a permit, setback or inspection problem after the work is already in place.

Permit fees, procedures, contacts and code guidance can change. Use the official Fairfax County links provided above for the final application, payment, inspection request or project-specific determination.