@magicalgirlsabrina
AIUI:
They're obligation to do work to industry standards.
You didn't specify that they wouldn't use blutack or tomato sauce to hold the wallpaper up either. But they couldn't do that anyway because its not industry standard.
Don't know if your location makes that a legally enforcable obligation though.
Here in Western Australia there is a Small Claims Court. If my wallpaperer failed to do work to industry standard then I'd be headed there.
https://mastodon.social/@skua/113545816039205692
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