The 26-year-old looked relatively comfortable on her way to a height of 1.87m, one centimetre shy of her winning leap last year, at the EIS in Sheffield.
She nearly wobbled at 1.89m, taking three attempts to clear the height, but blitzed 1.91m first time before meeting her match as the bar was raised by two centimetres.
Ennis was pushed by Emma Perkins but proved just too strong when the pressure was on taking gold and followed that up with sixth in the shot put after a best effort of 14.09m.
And former world heptathlon champion Ennis, who competed at the McCain City Challenge, also in Sheffield, last weekend, was content with her performances in her own backyard.
"I'm really pleased and it is nice to be jumping in the 90s because that's what I need to do in the pentathlon or heptathlon," said Ennis, who competed with British heptathlon rival Louise Hazel in the shot - the Commonwealth champion placing eight with a throw of 12.30m.
"I am always happy if I can come out and jump like that, it's promising for the rest of the year.
"It's always good to have a battle too because when I'm in a heptathlon and pentathlon there are some really good high jump girls there and we push one another.
"So it's good to have that kind of competition at home. I think you do worry a bit [when you have two no-jumps at a lower height] because you don't want to go out at that height.
"I really wanted to jump in the 1.90s, so there's a bit of worry, but you have to get yourself together and refocus."
Apart from Ennis the headlines were relatively low key with Yamile Aldama winning the triple jump with a leap of 14.09m - one centimetre shy of the world indoor qualifying standard.
Margaret Adeoye clocked 23.36seconds to take 200m gold however the distance is not on the schedule for next month's World Indoor Championships in Istanbul.
Meanwhile Andrew Sutcliffe got the better of British regular Steve Lewis to take pole vault gold - his winning leap 5.55m - while Eden Francis and Scott Rider took the women's and men's shot put titles respectively.
Elsewhere the men's 400m will be a competitive one with Rob Tobin, Michael Bingham, Luke Lennon-Ford and Richard Buck all running and only two individual world indoor places up for grabs.
And in the women's 400m former world silver medallist Nicola Sanders, Shana Cox and Nadine Okyere will do battle in the medal showdown.