Deck repair on a rental property

[Suvarna Joshi]

I have a deck on one of my rentals that was built by a builder 15 years back. The previous tenants just left and before renting it again I want to repair the rotten beams underneath the deck. It is a high deck with staircase that is about 15x20. The rotten beams are underneath the deck.

My question is - how do I get those support beams repaired? Does the contractor need to rebuild the whole deck? Is there a way to replace those beams without spending a whole lot of money?