Double Check

Once done wrong, there's always room, You can give a second chance, But there's space for gloom. Once it's complete, it goes unforgotten, Avoid contact with the snakes, Anything could go rotten. Changes are possible, and can be made, Be sure to see it happen, Or you'll be left under-paid. Once they leave, everything's gone, Every penny, every dime, But more space to move on. Be cautious and wary of who can knock, The door can be opened, So keep it tightly locked. Drill the rules of no trespassing in, Renew all of your laws, And your own security system.