Plan Validity Extension Request Form. Send us a letter to request your extension.You will automatically be granted an automatic six-month extension until October 15th to file. An Application to Extend Administration must be filed at the 6-month period if the estate cannot be completed at that time and requires court approval. The Planning Director may postpone the public hearing for up to 30 days without Planning Board approval. The Zoning Code therefore allows the Planning Director to extend a review once, for 30 days. Obtaining a federal extension will automatically extend your Montgomery due date to the approved Federal date. Case No. 9622 – Letter Order granting Montgomery County's Request for Extension of Time to File its Response Maryland Public Service Commission " In the News " Case No. 9622 – Grant of Request for Extension of Time to File Reply Comments " Case No. Do not fill out forms in-browser for the best experience.