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Probably the GP meant to hire people and order them to use a tall ladder. I don't think there's any country where it's illegal for you to use one outside of some kind of contract.
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Tradespeople are typically independent contractors. You hire them to do a task, and they use their own judgement on which tools to use. You don't order them to use a tall ladder...
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The regulations that tradespeople must obey and how they are contracted varies from one country to another.
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And hopefully these independent contractors are insured. It may well be insurance requirements that limit the use of ladders.
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It would not surprise me if this was a law in Germany, for example.
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