Debris rained down into two homes in Drewry Lane, one belonging to Mrs McKechnie, the other to a 95-year-old woman who was in hospital at the time. The wall flattened her garden shed.
Residents say it is lucky no-one was seriously injured. They're also worried about asbestos dust on the site.
More top news
133 mobile phones and sim cards were found inside Birmingham Prison in the last year, according to new figures released by the government.
Cloud giving way to brighter and colder conditions
Patchy rain with clear southern parts through Sunday. Becoming brighter.