Va. Code § 55.1-711
If information disclosed in accordance with this chapter is subsequently rendered or discovered to be inaccurate as a result of any act, occurrence, information received, circumstance, or agreement subsequent to the delivery of the required disclosures, the inaccuracy resulting therefrom does not constitute a violation of this chapter. However, at or before settlement, the owner shall be required to disclose any material change in the disclosures made relative to the property. If, at the time the disclosures are required to be made, an item of information required to be disclosed is unknown or not available to the owner, the owner may state that the information is unknown or may use an approximation of the information, provided that the approximation is clearly identified as such, is reasonable, is based on the actual knowledge of the owner, and is not used for the purpose of circumventing or evading this chapter.
Va. Code § 55.1-711