Don't fix what is not broken or pre-emptively fix it before it can be broken?

[Allan Wu]

Hi BP -- I'm currently working on my first House Hack. I'm debating whether or not to fix old sewer waste pipe. It is a huge ticket item and can eat ~30-40% of my reno budget.

Today I did a walk through with plumbers and contractors. My new property is in a small urban town near NYC. During inspections and walk-throughs with professionals the ancient waste sewer line were flagged as an issue because it is very old, probably cast iron or something. I've done camera work and the plumber said they see light root growth, but I could clean the pipes annually to prevent growth and back ups. They suggested while the property is vacant it is easier to repair, which costs 10-15k. 

The professional recommendations fell into two buckets. Replace it before it breaks and while the property is vacant. The second bucket is jet clean it twice a year for $300-$600 and install a flapper valve that prevents it from backing up. This way i can put more money into the kitchen and bathrooms that will increase my property value.

Hoping for some additional thoughts.