At the very least, they were looking at another two years of dealing with architects and contractors, and lots of litigation [because that's how Barry does everything]. They didn't need a bigger house, they were at an age where they needed to downsize. If she was thinking bigger, and he was thinking downsize, they were in for a long battle with nowhere to live. No one buys a house with a two year possession date.
In fact, most people have a three month possession date, so where was Barry supposed to live while doing business in Toronto after his house sold, and while his new house was being built?