Orange County commissioners are talking about a $100 million school bond for school construction and renovation — and the tax hike that would come with it.

A $100 million bond would require 4.18 cents on the county’s current 85.8-cent per $100 valuation property tax rate over the next 20 years, county staff said.

Commissioner Mark Dorosin said any renovation should allow more students to attend the school.

“I think if we’re going to put any money into the renovation of these older schools, which is much needed, I think we ought to demand that any renovation increase capacity,” he said. “I think it would be irresponsible of us to spend that money without (some benefit).”

The commissioners would have to hold a public hearing and agree to a bond referendum by June 2014 to get it on the November 2014 ballot. The last voter-approved schools bond was $47 million in 2001.