This new house was intended to be built around health and wellbeing, as Ara had an autoimmune condition.
However, problems started to emerge along the way, as Tony suffered a fall from a trolley, fractured his tailbone and was rushed to hospital.
A month later, he returned to work, but sadly Ara soon revealed she had been diagnosed with cancer.
The couple completed their new home after a four-year project, and Kevin visited them, admitting he was "approaching Tony and Ara's house with a little trepidation".
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"On top of the emotional, psychological, physical load this project has brought comes this latest news of Ara's cancer, which is so sad," he said.
Following a tour around the incredible new house, Ara and Tony sat down for a chat with Kevin, where Ara said: "Nobody could have predicted what was going to happen to me. So now, the path is to do peace, contentment and gratitude.
"I have so much to be grateful for. I mean, I live in a little piece of heaven. It's heaven round here."
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At this point, Kevin notably had tears in his eyes and struggled for words.
He said: "It's my turn to get a bit tearful now. I'm in awe of the pair of you. Very tough and very wonderful of you to have got this far, I think that's just a great thing."
Grand Designs will continue next week, with a new couple, Adam and Tassy, attempting to turn an abandoned water tower into a fun family home.
Grand Designs airs on Channel 4.
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