I normally wait a coupke of months (cleans) till they get to know me and me them before i ask for code as its a principle of trust on both sides.
I have a customer who ive been cleaning for,for nearly a year now. Key code on gate and a locked side gate for rear access of bungalow. Lovely family and mum is house bound, in wheel chair has no legs. Lovely woman and next door to my brother n his family. I clean both but need to make prior arrangements with this woman for gates to be open. After 5 cleans (4 wkly) i ask her for codes and get a simple No. i understand but said she has all my details on my card and my brother is next door so if worried im not legit, police can easily call on me! But still No! Its a pain but i still faff making these arrangements. Going to try n ask for codes at end of yr, as trust hopefully has built up by then! Will see n decide if i can continue to put up with faff or not..