Permits

Road traffic authorities  
Road traffic offices at the department for public order in each city grant permits for no parking signs, but they don’t issue signs. For those, you need to go to a sign company or a removal firm.
›› www.halteverbot-umzug.de

Sign rentals

Moveasy.de   
Operates throughout Germany, installation of no parking signs and procurement of permission. Orders can be made quite easily online.
›› www.moveasy.de

Move-o-naut   
Rental and erection of traffic signs and procurement of official permission. Orders taken online.
›› www.move-o-naut.com