A first-half strike from Graham Dorrans ended up being the winning goal, but Hodgson believes that his side's defensive efforts were just as important in claiming all three points.
"I thought in the first half it was a good game from our side and I actually thought we played quite well," Hodgson told Sky Sports News.
"In the second half I thought we lost a lot of the initiative and it went to QPR. They started bringing plenty of attacking players onto the field and they certainly asked a lot of questions about our defence.
"So the key was the fact that we were able to dig in and defend so well in and around the penalty area, getting some good blocks and keeping them out because of the clean sheet, which won us the game plus Dorrans' wonder strike."
The result leaves West Brom 13th in the Premier League, one point off a top-half finish, while QPR remain 16th, just two points clear of the relegation zone.