In this post, I am sharing two options for checking whether a column exists in a SQL Server table or not.
When you are preparing the full database change script, you should put DDL statements in the IF EXISTS condition for avoiding any error.

Option 1: Check the column existence and add id

if not exists 
(
	select column_name 
	from INFORMATION_SCHEMA.columns 
	where table_name = 'table_name'
		and column_name = 'new_column_name'
)

ALTER TABLE table_name add new_column_name TEXT

Option 2: Check the column existance

IF COL_LENGTH('table_name','column_name') IS NULL
BEGIN
 /*Write your code...*/
END