Normal life-span of a well constructed building has been estimated between 60-70years but due to poor construction method and some wrong demand from user it has reduced drastically.

Before you build your house stop some specifications either by you or from the builder like:

>Never embedded a PVC pipe in a columns.
>Conduit Wiring is good but hard to control in terms of maintenance. Use plastic conduit.
>If your site is located in a waterlodge area construct a "buried pipe" don't just sandfilled.
>Never use one stacking method. That is never use one pipe to carried all your liquid & solid waste to septic tank. Daulize the stack pipe i.e water from Bath tub, kitchen sink, wash hand basin should be connected directly to soakaway not septic tank then WC(water closet) should be connected to the septic tank.
And lot more.