Contract signings on new single-family homes decreased 0.6% to a 617,000 annual pace, the slowest since November, according to government data released Wednesday. The figure compared with a 640,000 median estimate in a Bloomberg survey of economists.

RELATED: How mortgage lenders and home builders form partnerships

The latest figures follow a topsy-turvy first half of the year, with sales gaining ground throughout the spring before slumping in May by the most in nearly a year. Thirty-year mortgage rates have dipped below 7% in recent weeks, but remain double what they were at the end of 2021, encouraging many builders to offer sales incentives such as buying down customers' mortgages.

Meantime, builders have continued to add supply, with inventory edging up to 476,000 homes in June, still the most since 2008. At the current rate of sales, that inventory would last 9.3 months, the longest since October 2022. 

While builders would ordinarily limit production once the supply-sales ratio exceeds 7.5 months, a lack of available previously owned homes is allowing them to keep up the pace, Robert Dietz, chief economist at the National Association of Home Builders, said last week.

An elevated inventory has, however, helped keep price growth in check. In June, the median sales price of a new home was little changed from a year ago at $417,300. After rapid growth in 2021 and 2022, price changes have been relatively muted in recent months.

Despite some "choppiness" in demand throughout its recently finished third quarter, DR Horton Inc., one of the biggest U.S. builders, reported a gross profit margin that beat analysts' expectations. DR Horton cut its average house size by 2% over the past year in response to affordability challenges, and it's considering boosting construction of townhouses in some markets, Chief Operating Officer Michael Murray said last week on an earnings call.

The government report showed new-home sales declined in the Midwest. Purchases fell in Northeast to the lowest level in nearly a decade, while rising slightly in the South and West.

While inventory in the resale market remains relatively low, builders are taking up the slack. The number of completed new homes that were for sale rose to 102,000 in June, remaining at the highest level since 2009.

New-home sales are seen as a more timely measurement than purchases of previously-owned homes, which are calculated when contracts close. However, the data are volatile. The government report showed 90% confidence that the change in new-home sales ranged from a 15.2% decline to a 14% gain.