Planning to remodel your kitchen, add a master suite, or undertake some other pricey home renovation in 2018? Watch out—not all of these home improvements pay off like they did in the past, according to Remodeling magazine's latest Cost vs. Value Report.

For this much-referenced annual report, now in its 31st year, researchers pinpointed the average return on investment of 20 popular home renovations by canvassing contractors nationwide on how much these upgrades cost to complete, then compared that with how much real estate agents estimated these features would boost a home's market price (in other words, their value).

And the news isn't so good for homeowners looking to remodel on a massive scale: The report found that in 2018, Americans should expect to make back only about 56% of the money they spend on renovations. That's down from 64% the previous two years.