 Work at Teddington started in September 1810, but there were delays caused by flooding in November and December, and Leach awarded the contractors an extra £500.The lock was finished and opened in June 1811, but the weir was incomplete.The cofferdam protecting the works would need to be removed as river levels rose in the winter, which would have delayed completion until the following July, and so again Leach stepped in, awarding advance payments to the contractors, which enabled them to finish on time.