I think most countries have laws to handle archeology on building sites, in France it's called "archeologie preventive": https://www.culture.gouv.fr/Regions/Dr

I think most countries have laws to handle archeology on building sites, in France it's called "archeologie preventive": https://www.culture.gouv.fr/Regions/Drac-Grand-Est/patrimoines-architecture/patrimoines/Archeologie/L-archeologie-preventive https://www.culture.gouv.fr/Regions/Drac-Grand-Est/patrimoin... Then of course there is general attitude of the local population towards common goods like archeology and enforcement policies (or lack thereof).