Fairfax County requires a Building Permit for most new residential and commercial construction, which includes, electrical, mechanical, plumbing, and framing installations, and alterations; to include building additions, decks, carport enclosures, finished basements, second kitchens, bathroom and kitchen alterations. If you notice suspicious new construction, demolition of an existing structure, construction equipment or materials, mud on the streets, or work occurring on the weekend or after hours anywhere in the county, contact the Department of Code Compliance to confirm whether a permit is required or was issued to the subject property (address). If the permit requirement is in question, an investigation of the activity would be performed to make that determination. If the investigation reveals the work to be unpermitted, then the violation notice would be issued requiring permits to be issued and inspections to occur. Your identity will be kept confidential.