Local Government Code §212.009

(a) The municipal authority responsible for approving plats shall act on a plat within 30 days after the date the plat is filed. A plat is considered approved by the municipal authority unless it is disapproved within that period. (b) If an ordinance requires that a plat be approved by the governing body of the municipality in addition to the planning commission, the governing body shall act on the plat within 30 days after the date the plat is approved by the planning commission or is considered approved by the inaction of the commission. A plat is considered approved by the governing body unless it is disapproved within that period. (c) If a plat is approved, the municipal authority giving the approval shall endorse the plat with a certificate indicating the approval. The certificate must be signed by: (1) the authority's presiding officer and attested by the authority's secretary; or (2) a majority of the members of the authority. (d) If the municipal authority responsible for approving plats fails to act on a plat within the prescribed period, the authority on request shall issue a certificate stating the date the plat was filed and that the authority failed to act on the plat within the period. The certificate is effective in place of the endorsement required by Subsection (c). (e) The municipal authority responsible for approving plats shall maintain a record of each application made to the authority and the authority's action taken on it. On request of an owner of an affected tract, the authority shall certify the reasons for the action taken on an application.