Broward school district promises families that security will be upgraded.

South Florida’s rising property values are good news for people looking to sell, and for local governments that want more taxes without having to raise their tax rates, but they’re not helping regular workers trying to find affordable places to live.

Friday’s preliminary estimates of taxable property value show healthy gains from last year, with Broward County values up 6.2 percent, Palm Beach County’s 4.8 percent higher and Miami-Dade County posting a 3.9 percent increase, according to their property appraisers.

In addition, South Florida governments will see a boost in tax revenues from $10.8 billion in new construction that is being added to the rolls this year.

“We’re still on an upward trend,” Broward Property Appraiser Marty Kiar said. “Hopefully things continue on this path. … With the housing market, you just never know.”

Contributing to the higher values is a shortage of single-family homes, a competition between families and investment companies for the homes that are available, and a trend by builders to provide more lucrative, upper-end housing products, said Jack McCabe, CEO of McCabe Research and Consulting in Deerfield Beach.

The higher prices are pushing home ownership further out of range for many and making it harder to find anything affordable, he said.

“Even the apartment rents have