KPRC-TV in Houston was first to report the news and is also reporting that Mason, 29, received a $10 million signing bonus.
In March, the Texans acquired Mason from the Tampa Bay Buccaneers for a 2023 sixth-round draft pick.
Last season, Mason had a 92.7% pass block win rate — ranking 27th, per ESPN Stats & Information research — and allowed three sacks.
Mason becomes the second offensive lineman whom the Texans have extended since March. The first was left tackle Laremy Tunsil, who signed a three-year extension worth up to $75 million.
Sources – Texans, guard Shaq Mason reach 3-year extension