An out-of-shape house is older than its years and could lose 10% of its appraised value, says Mack Strickland, an appraiser and real estate agent in Chester, Va. That’s a $15,000-$20,000 adjustment for the average home.
But good maintenance can even add value. A study out of the University of Connecticut and Syracuse University finds that regular maintenance increases the value of a home by about 1% each year.
So if you’ve been deferring maintenance, or just need a good strategy to stay on top of it, here’s the simplest way to keep your home in good health.

Focus on Your Home’s #1 Enemy
If you focus on nothing else, focus on moisture — your home’s No. 1 enemy.
Water can destroy the integrity of your foundation, roof, walls, and floors — your home’s entire structure. So a leaky gutter isn’t just annoying; it’s compromising your foundation.
Keeping moisture at bay will improve your home’s effective age — or as Dr. Oz would say, “real age” — and protect its value. It’ll also help you prioritize what you need to do.

1.  When it rains, actively pay attention. Are your gutters overflowing? Is water flowing away from your house like it should? Is water coming inside?

2.  After heavy rains and storms, do a quick inspection of your roof, siding, foundation, windows, doors, ceilings, and basement to spot any damage or leaks.