She's reopened the Fill Your House For Free store in Glasgow to source the nation's highest quality cast-offs and help transform homes at a fraction of high street prices.
Salvage specialist Charis Williams, inventor and furniture hacker Max McMurdo, and artist and up-cycler Lee Baker are all on hand to help Kirstie out, as she shows free can also be fabulous.
Tonight, they're helping Hannah and Andy, whose maxed-out mortgage means cash is in short supply for making a functioning family room, a sewing studio for Hannah and a man-cave for Andy.
And we'll also meet Arfa and Salim, whose sitting room is furnished with just a rug and four cushions, but can the team convince Arfa to go second hand?
Kirstie's Fill Your House For Free, Channel 4, 8pm