We hear this question a lot. Tipping is an expectation in many industries, particularly the restaurant industry. A tip is seen as a way to thank the provider of a service for their great work. In the home services space, especially house cleaning, tipping isn't an expectation as it is in the restaurant industry. There a few reasons for this. Firstly, if cleaning pros work with professional companies or agencies like ours that pay well, they have the opportunity to make as much as an analyst at an investment bank. Furthermore, clients don't like the pressure of tipping when they are set up with their cleaner on a recurring schedule. Some clients might leave $5 or $10 on the countertop labeled "tip", but cleaning pros don't expect it; the service price that is quoted to the client is all-inclusive. Finally, tipping can send the wrong signals. If you tip your house cleaner $20 after the first cleaning and $10 after the second, they might think the lower tip is because of a subpar performance. In the restaurant industry, you are most likely not going to see the waiter who served you for a while (especially considering the industry's high turnover) so tipping doesn't carry the same pressure.
All that being said, it is not uncommon to tip your house cleaner 10% - 15%. It is a nice thing to do. You should not worry about building up an expectation for tipping with your house cleaner. If your house cleaner is asking you for tips, then either the service price is not high enough or you probably need to find a new cleaner.