Va. Code § 36-98
The Board is hereby directed and empowered to adopt and promulgate a Uniform Statewide Building Code. Such building code shall supersede the building codes and regulations of the counties, municipalities and other political subdivisions and state agencies.
However, such Code shall not supersede the regulations of other state agencies which require and govern the functional design and operation of building related activities not covered by the Uniform Statewide Building Code including but not limited to (i) public water supply systems, (ii) waste water treatment and disposal systems, and (iii) solid waste facilities. Nor shall state agencies be prevented from requiring, pursuant to other state law, that buildings and equipment be maintained in accordance with provisions of the Uniform Statewide Building Code.
Such Code also shall supersede the provisions of local ordinances applicable to single-family residential construction that (a) regulate dwelling foundations or crawl spaces, (b) require the use of specific building materials or finishes in construction, or (c) require minimum surface area or numbers of windows; however, such Code shall not supersede proffered conditions accepted as a part of a rezoning application, conditions imposed upon the grant of special exceptions, special or conditional use permits or variances, conditions imposed upon a clustering of single-family homes and preservation of open space development through standards, conditions, and criteria established by a locality pursuant to subdivision 8 of § 15.2-2242 or § 15.2-2286.1, or land use requirements in airport or highway overlay districts, or historic districts created pursuant to § 15.2-2306, or local flood plain regulations adopted as a condition of participation in the National Flood Insurance Program.
Va. Code § 36-98