This information is the most common for how to obtain the necessary permits for your project and is not representative of all the conditions you may encounter.
You will be required to obtain a residential addition building permit and an electric permit.
Fees vary depending on the scope of your project; most solar permit fees are waived. Access the fee schedule by visiting our website.
Follow the steps below to obtain the necessary approvals and permits for your project. Vienna and Clifton residents require additional approvals from their respective towns. You may obtain the status of your permit application or obtain the status of your plan review, if applicable, at any time online.
Obtain permits online using FIDO. If you are a first-time user, you must first follow the prompts to create an account. Once you are logged into FIDO, apply for a residential addition building permit. Additional steps are required for your ePlan upload process. Once the application is complete, you will be invited by email to upload your required documents to ProjectDox for submission to the county.
Fees vary depending on the scope of your project; use the online fee estimator to help determine your costs.
County staff from the Permit Application Center will review your package for completeness and compliance with the building code and county ordinances. You will be notified of any deficiencies. Plan corrections, resubmission fees and additional supporting documents may be required.
Residential Fast Track allows customers with one-story structures less than 500 square feet to apply for a permit under the fast track process to receive expedited reviews. See our operational status page for more information on review times.
Once all county reviews are approved and outstanding fees have been paid, you can access your approved plans in ProjectDox and approved permit in FIDO. The permit must be posted at the job site; the approved plans and any required manufacturer’s installation instructions must be printed in full size and available to the inspector.
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; see the table below.
Ladders, scaffolds and other equipment necessary to access construction must be provided to the inspector. To schedule, cancel or modify an inspection, go to fairfaxcounty.gov/fido or the Fairfax County smartphone app. The required photo’s need to be available for the inspector during their visit.
→ Building final→ Electrical final
✓Close up photo of UL listed tag/sticker of module and mounting system
✓Close up photo of attachment of rack system
✓Close up photo of assembly rack system
✓Close up photo of attachment of module to rack system✓Close up photo of grounding connections at mounting racks and module connections to racks
Before you begin excavating for your project, you must first call Miss Utility at 811, TTY 711. Miss Utility is a free service that marks underground utilities.
When applying for a permit, submit two copies of your building plans. The plans must meet or show the following:
Local Design Criteria
→ Ground snow load: 25 psf
→ Ultimate wind speed: 115 mph
→ Maximum assumable soil bearing capacity: 1,500 psf
→ Minimum assumable lateral earth pressure: 60 pcf
→ Frost depth: 24 inches
Typical solar construction plans are available from Fairfax County that may be used in lieu on a plan submission during permit application if your project qualifies.
You must reference its evaluation report from a nationally recognized listing agency, such as ICC-ES, certifying it meets the requirements of the building code. This is required for products such as pre-made sunrooms, EIFS, adjustable columns and plastic composites.
General requirements for use of the typical residential solar construction plans:
12000 Government Center Pkwy
Fairfax, VA 22035