After a building permit has become final, newly discovered evidence can create a separate procedural question. Reopening is available only under the conditions set out in section 69 of the General Administrative Procedure Act.
The key points are a procedure already concluded by decision, the absence of an ordinary legal remedy, a statutory ground for reopening and the short period running from knowledge of that ground. Evidence that could have been presented earlier without a valid reason is not enough on its own.
This article explains when new facts or evidence may matter, how the two-week period and the absolute three-year limit operate, and how the filing authority, deciding authority and later procedural steps must be distinguished.