It followed emphatic victories over Scotland and Italy but France have been equally impressive hitherto, also chalking up three wins from their opening three matches.
It means that England will take a huge step closer to a seventh straight crown should they claim victory in Paris on March 11 - and Street is only too aware of the threat that France will pose.
"We have now got two weeks to prepare for our penultimate game against France and really look at ourselves and analyse the French," said Street.
"With both teams unbeaten this is going to be a titanic battle but we are going to make sure we are ready for that challenge.
"I was really pleased with the performance on Saturday. Wales made us work hard for the victory, bringing passion and determination to the game and they tried very hard to stop our players in their tracks.
"At half-time when we were leading 13-0 we spoke about improving our discipline, to stop giving away so many penalties and to be more patient. When we started to do that the points came."