In Lucknow, the first question is who you are writing to.
Lucknow is the state capital, and the state is a large part of its economy. Contractors supply government departments, vendors bill the development authority and the municipal corporation, shopkeepers deal with the electricity department, and plot owners deal with the Lucknow Development Authority. A dispute with a private party starts with a demand letter. A dispute with a government body starts with a statutory notice, and sending the wrong one can cost you months.
We draft both. This page covers what is specific to Lucknow: who the usual respondents are, which forums apply, the disputes we see and the fee. The general rules are in our guides, including the Section 80 CPC notice before suing the government and the service page to send legal notice online.