The Township has a Stormwater Ordinance which requires residents to control their stormwater runoff from new construction projects in excess of 499 square feet. Additionally, a grading permit is required for land disturbances of more than 5,000 square feet on regular grades, 1,000 square feet of land on a steep slope. If a project requires a stormwater and/or grading permit as well as a building permit, the plans and applications for both can be reviewed simultaneously by the Township staff.
PLEASE NOTE: Our engineering department will only be accepting stormwater and grading permit applications electronically via e-mail to EngineeringDept@tredyffrin.org or via US Mail. If the file is too large to send via e-mail attachment, please submit your information via an FTP/Dropbox link. Please call or email to schedule inspections. (Updated 5/19/2020)