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.

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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. Here’s how:

Follow This Easy 4-Step Routine

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.

Related: How to Tell if You Have a Drainage Problem

3.  Use daylight savings days or the spring and fall equinox to remind you to check and test water-related appliances like your washer, refrigerator, water heater, HVAC (condensation in your HVAC can cause leaks) or swamp cooler, and sump pump. It’s also a great time to do regular maintenance on them. Inspect any outdoor spigots and watering systems for leaks, too.

4.  Repair any damage and address any issues and leaks ASAP.

Don’t procrastinate when you spot minor leaks or drips inside your house. Ongoing small leaks can slowly erode pipes and fixtures, and even cause mold and mildew issues you won’t notice until it’s too late.

Say you’ve got a bit of cracked caulk around the kitchen window. It may not seem like much, but behind that caulk, water could get into your sheathing, causing mold damage and rot. Before you know it, you’re looking at a $5,000 repair that could have been prevented by a $4 tube of caulk and a half hour of your time.

To help you with this routine, we have several guides with specifics and tips:

Once you settle into a routine, it becomes easier to handle other maintenance tasks, which will only do more to protect and enhance your home’s value. Plus, you’ll get to know your home better, which will help you spot other one-off problems, such as termites and other wood-destroying insects, that can cause costly damage.

If You Want to Take Home Maintenance to the Next Level …

If you’re a geek about home maintenance like we are, and you want to do more than water patrol, these ideas will help you keep your house in great shape.

Give yourself an incentive to do maintenance. Maintenance is your springboard to sexier projects like a kitchen remodel or basement makeover. So plan a room-per-year redo. This way you’re maintaining, fixing, and improving. For example:

In your basement:

  • Check for dark stains that could signal plumbing leaks. If you find any leaks, fix them.
  • Check your ductwork for leaks that are wasting energy.
  • Clean the lint out of the dryer vent. The machine will last longer, and you’ll help prevent fires.
  • Caulk and seal basement windows to stop air leaks.
  • Once your space is moisture sealed, you can start converting it into a family room or other livable space.
  • Brighten it up with paint.

In your kitchen:

  • Clean out all the cabinets, then wipe them down. It’s a great way to purge and get organized.
  • Take a good look under your kitchen sink. Remove all the wastebaskets and cleaning supplies to help you spot any leaks, and fix them.
  • Re-caulk the seam between your backsplash and wall to keep moisture out. To give your whole kitchen a low-cost facelift, how about a new backsplash?
  • Re-paint the walls using paint with a tough, semi-gloss sheen that stands up to repeated cleanings and resists moisture.

Keep a maintenance fund. Some sources say you should save 1% to 3% of your initial house price annually to pay for maintenance. On a $200,000 house, that’s $2,000-$6,000 a year. Yeesh, that’s a big nut.

Alternatively, make it a goal to save enough money to do a major replacement project, so the bill won’t catch you off guard. Probably the biggest single replacement project you’ll have is your roof or siding.

You can build up this fund over several years by paying yourself a monthly assessment — whatever you can manage. Keep it in a separate account to avoid the temptation to tap it for hockey tickets or other impulse buys.

If you need to replace the roof before you have a fund, an equity loan is an option. But consider very carefully.

Related: When to Use Home Equity and When Not To

If you’re practicing maintenance in the way we’ve outlined here, you won’t need $2,000 per year to manage your home’s natural aging process.  Some routine tasks, such as cleaning rain gutters and changing furnace filters, could cost you $300 or less per year.

Your house takes care of you — not just for shelter but as a financial asset.  Return the favor and keep it hale and hearty by caring for it with regular maintenance.