crack

you don't pay fees when you sell your house only when you buy.

Its called a tariere here is an example http://www.kiloutou.fr/construction-amenagement/espaces-verts-creation-entretien/tariere-essence-2-temps-diam-10-20-et-35-cm

Which DTU reference do these tools contravene?

Its not against regulations when you can buy this http://www.laperchediffusion.fr/index.php?cPath=1&osCsid=b26b14c3a988dbd131ac0cd6674d86d7