The VA is not specific on this. Compliance to applicable current buidling codes only applies to proposed/under construction. For existing dwellings, it must be "safe, structurally sound, and sanitary and meet the standards considered acceptable in a permanent home in its locailty". (ch.12, very first page) The VA expects that you, as an expert in your field and your market area, to exercise judgement in determining if the dwelling meets this criteria.
If they want specifics on what is considered acceptable, I would refer them to alternative guidelines such as HUD or the local building codes, but it is not required, by the VA, to comply with these guidelines; only that it meet the above criteria.
