I have raised rent for the two properties that I owe the last two years. I was doing some research online, and it is always a good idea to raise rent given that you are not already charging over market price. I always include a nice letter letter explaining why this is necessary, and how this is not as painful for the landlord and the tenants.
Also, it's always easier to include a tiny bit year after year, instead of a big amount every 5 years or so. Assuming everything has been going well, most people would not move for a small amount difference monthly rent, moving around and looking for housing is just too much hassle, cost and stress =)
the example letter I use is included below:
*********************
Dear Joe,
The time of the year has come when it is time to renew your lease. I want to continue to have you as residents, and appreciate how friendly and easy you are to work with. Thank you so much for paying your rent on time every month and taking such great care of the property.
As you can imagine, over the last year our expenses on the property have increased because of taxes, insurance and inflation etc (especially the HOA fee has been increased significantly).
Anyways, we are swallowing most of the fees since we enjoy having you all as resident and the good news is that your rent is only slightly increasing. We want to make the payments as low as possible and the rent is only increasing$120.00 a month. Your new monthly rent amount will be$1620.00, effective October 1, 2013. If you have any questions about this, please feel free to give me a call. We look forward to having you as resident for a long time.
Let us know what is a good time to stop by for you guys to sign the new contract (10/1/2013 to 9/20/2014), we can stop by anytime after work tomorrow or thursday.
Warmest Regards,
Bruce