The Rs avoided relegation on the final day of last season, as Bolton's draw with Stoke consigned them to the Championship despite Mark Hughes' men's defeat at Manchester City.
The west Londoners have been busy in the transfer market already, capturing Robert Green, Andy Johnson, Ryan Nelsen and Samba Diakite, with a deal for Manchester United's Park Ji-Sung also understood to be near completion.
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"It shows that we are serious," Fernandes told Sky Sports.
"We have done some good business already - five signings, good business and I think we have been the most active.
"It's been sensible business, we have gone step by step and we have made progress on the training ground, the one we are in, and we have got a new one coming, which looks pretty spectacular.
"We have got a fantastic academy system coming and our new stadium, which really excites me."
QPR have also signed Park's United team-mate Fabio on a year-long loan, with Hughes' links to the Red Devils playing a part in negotiations for both deals.
However, though he hailed the full-back's arrival, Fernandes indicated a preference for securing players on a permanent basis.
"We did a fantastic loaner with Fabio, but it's not really my strategy," The 48-year-old added. "I want to build loyalty, I'm not here to train other people's players.
"We want to build our own players and that's why we invested in the squad that we've got, which is a good mix of youth and experience.
"We needed experience - the Premier League is about guys who have been playing there for the last few years, we didn't have that at QPR. I think Mark has brought in some great players.
"I think we have a super manager. He's a great guy and we have a great relationship. I feel we're doing a few things right."