The hot weather is exposing the complexities of Swiss federalism.
Different cantons are bringing their own hot weather rules for construction companies.
In Geneva, heavy work is banned from midday, while canton Ticino says all work has to stop by 3pm – but that canton allows for an earlier start than others, at 6am.
Other cantons are varying rules – if they have any at all.
It could be confusing for a company that has projects ongoing in different cantons.
One site could be under different rules than the other, despite being only a few kilometres from each other.
A spokesman for the Swiss Builders Federation says its hard to keep track.
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