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Watch Grand Designs Season 26 Episode 3 online — it may be available on legal streaming platforms such as YouTube, Netflix, Prime Video, Hulu, Disney+, and others.

Recently widowed 82-year-old Kathryn plans to build a new, accessible, ultra-sustainable home right next door to the home she lived in with her husband Jon, where a garage and extension currently sit. It'll be a mirror image of her current Edwardian house, but with a 21st-century twist. Pulling off this daring feat proves difficult, when far deeper than anticipated foundations have to be removed, horrendously wet weather causes problems and unexpected costs arise.