• California homeowners can expect to spend nearly $17,000 each year to maintain their properties, higher than the national average.
  • Atherton ranks as the most expensive city in California for home upkeep, an average of more than $27,000 per year.
  • Replacing a swimming pool’s filtration system is the most expensive routine home-maintenance task, costing nearly $1,800 and required about every two years.

Almost all new homeowners have calculated their monthly mortgage payments, but fewer have likely factored in the cost of routine maintenance tasks.

An analysis by home-remodeling portal Porch breaks down home-maintenance costs by states and ZIP codes, as well as individual jobs. Though it’s commonly accepted wisdom that owners should expect to spend 1 percent of a home’s cost on maintenance each year, Porch determined that nationwide, Americans spend an average of $16,000 on home upkeep annually, assuming that the work is outsourced to professionals.

Not surprisingly, Golden State homeowners can expect to pay a bit more than the typical U.S. homeowner. Californians spend an average of $16,957 per year on home maintenance, the seventh most in the country and the highest of any Western state.

And anyone who has purchased home in the exclusive Silicon Valley community of Atherton — America’s most-expensive ZIP code as of last fall — can expect sticker shock when it comes to maintenance, too. There, the average homeowner spends an average of $27,242 each year on home upkeep, the most in California and the third-highest in the nation.

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