Office of the Fire Marshal

CONTACT INFORMATION: Office Hours: 8 a.m.-4:30 p.m., Monday-Friday, Lobby Hours: 7:30 a.m.-3:30 p.m., Monday-Friday
703-246-4800 TTY 711
12099 Government Center Parkway
Fairfax, VA 22035
John Walser
Assistant Chief, Fire Official - 703-246-4753

Underground Line

The Underground Line record is required to install, modify, or demolish a Fire Service Line piping, Freestanding FDC, Private Hydrants, or Water Supply Systems.


This information is the most common for how to obtain the necessary approval for your project and is not representative of all the conditions you may encounter.



Property owners may obtain permits in their own name; however, it is strongly recommended a properly licensed contractor pull the permits as the responsible party so the county can better assist in gaining compliance for defective work.

Accepted DPOR License for this record type is:

  • SPR (Fire Sprinkler)
  • PLB (Plumbing)
  • UUC (Underground Utility Contractor)
  • H/H (Highway/Heavy)



Before submitting your plan, ensure you are aware of all applicable regulations and conditions that could affect your project, to avoid surprises during the review process. Factors that may apply for this permit include:



PLUS Application

Apply for your Underground Line record online in PLUS under the Fire tab. If you are a first-time user, you must first register for an account.

application tab


Instructional Videos for PLUS

For step-by-step instructions to submit this record, click HERE.
  • Reference the parent or related building permit number if the proposed scope of work for the same project and address:
    • is relevant to a Site record
    • has plans submitted on another Fire record of same type
    • has a pending or approved Code Modification



Upon submission, the record number provided will start with FUGLN.



Document requirements will vary based on answers provided during the application process.

  • Plans - Required if plans have not already been submitted on another Underground Line record.
  • Technical Data Sheets - Required if technical data sheets have not already been submitted on another Underground Line record.
  • Temporary BPOL Certificate - Required if the licensed contractor does not have an active but required Business, Professional, and Occupational License (BPOL) with the Fairfax County Department of Tax Administration (DTA.).
  • Property Ownership Affidavit - Required if a licensed contractor is not being listed on the application.
  • Address List - Required if multiple addresses are to be permitted under the scope of work.

First Submission

  • Provide Plans (aka Shop Drawings) that meet the necessary code requirements.
  • Projects located in the towns of Clifton, Herndon, or Vienna require separate approvals from the respective towns.

Subsequent Submissions

If corrections are required, you will receive an email with links and instructions to make corrections and resubmit.

  • Issues” are comments from reviewers, which require an applicant response before resubmitting. Please respond to each “open” comment.
  • Once complete, upload updated plans and/or documents, if needed, and complete your resubmission.

For further assistance, please refer to the below videos for step-by-step guidance on the resubmission process:

Helpful Videos:

red arrow in gray box Reviewing Issues, Conditions, & Notes in PLUS - YouTube

red arrow in gray box Void a Plan Sheet - YouTube

red arrow in gray box Upload Corrected Plans in PLUS - YouTube


What's Next?

To get a step-by-step guide on PLUS statuses and what they mean, see our What is My PLUS Status? infographic.

Below are the necessary steps to follow after your application is accepted in PLUS.

County Review

Staff in Revenue & Records and Engineering Plans Review will review your package for completeness and compliance with the fire code and county ordinances. You will be notified of any deficiencies. Plan corrections and additional supporting documents may be required.

Engineering Plans Review is responsible for verifying that designs submitted for installation comply with the Statewide Fire Prevention Code, Code of Fairfax County, and Public Facilities Manual. The Commercial Plan Review Submittal Requirements will explain what needs to be included in your plans/shop drawings.


Permit Issuance

Once the review is approved and fees have been paid, your permit card (if applicable) and approved plans will be available to download from PLUS. You will also receive a link via a PLUS email notification.

red arrow in gray box Access Approved Plans in PLUS - YouTube Video


Acceptance Testing Inspections

Once the permit is issued and you begin construction, you are required to obtain inspections from the county for your project. The county must be notified when the stages of construction are reached that require an inspection.

Requests for Acceptance Testing fire inspections must be made via email. Send the Acceptance Inspection/Test Request form to


Additional Resources


Need More Assistance?

For questions or additional information, please contact staff:

Permit Application Process and Fees >> Call the Revenue & Records Branch at 703-246-4803, TTY 711 or email

Plan Review >> Call the Engineering Plans Review Branch at 703-246-4806, TTY 711 or email


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