The average single-family homeowner will see a 13% tax increase next year, a scenario that was projected earlier this week by the city and confirmed Friday by the state Department of Revenue, Boston Mayor Michelle Wu’s office said.

Wu’s office said Friday that the city’s property valuations have been certified by the Department of Revenue, which confirmed that the average homeowner will experience a double-digit property tax increase for a second straight year — unless state lawmakers approve the stalled tax shift legislation the mayor’s been pushing for nearly two years.

“Now that the valuations for Boston’s 180,000-plus parcels have been confirmed, we can say with certainty that unless the state legislature takes action on Boston’s residential tax relief home rule petition, the average

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