A 23-13 victory over Les Bleus at Twickenham Stadium was enough to keep England's dreams of the Grand Slam alive.
"I thought our control grew in the game," Lancaster told BBC Sport. "Our defence was fantastic.
"I thought the players showed a lot of maturity. We'll have a bit of a break and then focus on Italy."
England welcome the Italians to Twickenham on March 10.