Economists, builders and analysts expect smaller homes to make a comeback in coming years with the return of entry-level buyers.

Still, the shift toward larger new homes in recent years has been remarkable. Commerce Department data released this week show unprecedented demand in 2014 for homes with four or more bedrooms, three or more bathrooms and three-car garages.

The annual Characteristics of New Housing report found that 46% of single-family homes constructed last year had four or more bedrooms, up from 44% in 2013 and from 34% in 2009. Thirty-six percent of the homes built last year had three or more bathrooms, up from 33% in 2013. Meanwhile, two-car garages remain the norm, but they’re receding in popularity – to 62% of homes built last year from 64% in 2013 — while three-car garages increased to 23% from 21%.

The latest numbers are a reflection of a multiyear run-up in median new-home sizes, fueled by builders’ focus on better-heeled buyers with better credit while entry-level and first-time buyers largely remained sidelined in the recovery.

Lately, builders and other observers say they’re starting to see life in the entry-level market. Median new-home sizes had declined slightly for three consecutive quarters before taking an upward turn in this year’s first quarter.

Robert Dietz, an economist with the National Association of Home Builders, predicts new-home sizes will plateau this year as builders start constructing a greater number of smaller, less expensive homes. D.R. Horton Inc. already is doing so, and peers Meritage Homes Corp., Ryland Group Inc. and Century Communities Inc.CCS +0.20% are starting on that path.

“At this time next year, I would expect a lot of the variables that show size to be flat,” Mr. Dietz said. “As those first-time buyers come back, maybe [there will be] some reversal in the characteristics of completed homes.”

That isn’t to say McMansions will lose popularity. Rather, the overall mix of homes built will shift. “We haven’t seen a decline in the demand for larger homes,” said Dale Francescon, co-chief executive of Denver-based Century Communities, which operates in four states. “What we’ve really seen is an increased demand for smaller homes at a lower price point.”

Meanwhile, 2014 will go into the history books as the year of the McMansion. The percentage of homes built with four or more bedrooms last year was 12 percentage points higher than at the housing market’s recent nadir in 2009. The same goes for the percentage built last year with three or more bathrooms. Those built with three-car garages was up seven percentage points from its trough in 2010.

Two other trends gained traction last year. Homes built with patios rather than porches or decks increased to 20% of new construction in 2014 from 17% in 2013. That reflects the broad preference among builders and buyers for patios that serve as outdoor kitchens, accessible through large sliding doors that often make the patio appear to be part of a home’s living space.

Buyers and builders also showed a growing affinity for homeowners associations. The Commerce data found that 59% of homes built last year were included in HOAs, up from 58% in 2013 and from a recent low of 46% in 2009 when Commerce started tracking the trend.

The HOA trend could be a sign of more U.S. home construction being handled by large, publicly traded builders, who tend to favor building in big subdivisions and master-planned developments, which often have HOAs. But it also could reflect buyers’ preferences.

“I think there’s been a flight to quality,” Century Communities’ Mr. Francescon said. “As we’ve continued to build out of the recession, people want a protection of their [property] values, and HOAs tend to do that.”