The septic system needs to be replaced because of the water table in our location and the damaged drain field.

Example: On the original scope, the fence in the back yard was to be removed and replaced with a new fence.

As mentioned above, you need to be setting aside for roof replacement, driveway maintenance, HWH and furnace replacement, etc.  

The roof is a flat roof which costs about $1100 to replace in our area. 

Most paid courses can be replaced with free advice here.

@Himanshu Jain  you could also pay a civil engineer probably 500 to 1000 bucks and they would write it out for you that is specific to your location and jurisdiction.I do this when I am looking at new areas.

I'm not sure if it works for berber, but my carpet repair people use a tool to cut out and replace the stained area.

I spent about 10 hours (and $250) painting chipped paint, Installing some smoke detectors and replacing a window, but was able to keep the deal alive. 

The extra income is nice but it never covers destroyed yard or replacing all the flooring that was damaged by pet urine.

I have been working for a civil engineering firm for the last 2 years and knew I wanted to dive into the REI world and that it could relieve me from a boss or 9 to 5 and provide financial freedom for me and my future family so we could focus on giving back or reinvesting I like to think.