Land Development Services

CONTACT INFORMATION: Monday through Thursday, 8 a.m. - 4 p.m. and Friday, 9:15 a.m. - 4 p.m. Please note that visitors may not be added to in-person queues past 3:45 p.m.
703-222-0801 TTY 711
12055 Government Center Pkwy
Fairfax, VA 22035
Bill Hicks

RPA & Floodplain Review for Minor Additions

buffer limits

Minor residential additions can be reviewed and approved for construction in a Resource Protection Area (RPA) per County Code 118-5-5 (A) and 118-5-5 (B), provided these conditions are met:

  • Dwelling was built prior to the establishment of the RPA (before Jul. 1, 1993, or Nov. 18, 2003, depending on the RPA mapping designation);

  • Addition is attached to the primary structure;

  • Results in a cumulative total of less than 1,000 square feet, or 2% of the total lot area up to a maximum of 2,500 square feet, of impervious area within the RPA, whichever amount is greater;

  • If the associated land disturbance for the project is less than 2,500 square feet, use the Chesapeake Bay Preservation Ordinance Resource Protection Area (RPA) Exemption/Exception Request Form and refer to the Submission Process below. If the total proposed disturbance exceeds 2,500 square feet and requires a grading plan, use the form for further review by the Site Development and Inspection Division; and,

  • If the proposed addition is located within 15 feet of a floodplain boundary (or for decks, within the floodplain boundary), a separate Floodplain Use Determination (FPUD) is required. See below Submission Process for further details.

Submission Process

  1. Fill out the appropriate WRPA Form for your project: Exception Request & WQIA-Minor Additions Form or Removal of Vegetation in a RPA Form
  2. Obtain/Draw a scaled Plat showing the proposed work. For more information on submitting plats please visit Submitting House Location Plats
  3. Create the Waiver (WAIV) application in PLUS:
    1. Click on the “Site” Module Tab
    2. Click “Create an Application”
    3. Check the “I have read and accepted the above terms”
    4. Click “Continue Application”
    5. Click “Waivers”
    6. Click “Continue Application”

Process Application
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Application Process
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  1. Fill out the “Location and People” Tab
  2. Fill out the “Application Detail” Tab
    1. Project Name: Name your project
    2. Project Description: WRPA for MSR Review and description of work
    3. Waiver Type: Resource Protection Area (WRPA)
    4. Waiver of: County Code
    5. Code Reference: 118-5-5(A) – Minor Additions
    6. Code Reference for Parent Plan: County Code – Chapter 104 Grading Plans
    7. Waiver Category: Exception

Application Process
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  1. Review the “Application Information” on the “Review” Tab
  2. Click “Continue Application” on the “Associated Forms” Tab
  3. “Receipt/Record Submittal” Tab (your WAIV Record Number has been created for tracking ex. WAIV-2024-00000). Note, there is no payment due for this review.

Application Process
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  1. Upload the required WRPA Form for your project: Exception Request & WQIA-Minor Additions Form or Removal of Vegetation in a RPA Form and the scaled Plat and click “Upload and Validate.” Then click “Continue.” Select “Waiver Application” and “Plans” as the two document types to upload.

Application Process
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  1. Validate and Version your Plan Sheets and then click “Finish”
  2. You should receive a confirmation email of your review package being submitted for processing and review
  3. Once the WRPA approval and FPUD approval (if applicable) are issued, resubmit your Building Permit (BLDR) Record in PLUS under “My Records” in your “Building” Module for Building Permit Services’ review and approval ( Building Permit Services will review and approve the Site Review on your Building Permit Application

More Information on RPAs

For more information on RPAs to include forms, a RPA guidance map, and FAQS, see the county’s Chesapeake Bay Preservation Ordinance Webpage.


Contact for WRPA status inquiries and for FPUD status inquiries.

Fairfax Virtual Assistant