We have a page on our website titled 'Dojo Rules and Etiquette'.
It's strange to have this page as there really are no specific rules, just the overall requirement that people are nice to each other and act appropriately when in the dojo.
Occasionally it's useful to have something written down so everyone has something to refer to in case they aren't quite sure what 'appropriately' means, so why don't you have a read through. Might be worth getting a coffee first ;)
http://www.cumbria-jujutsu.co.uk/index.php/about-motoha-yoshin-ryu-jujutsu/dojo-etiquette