I've heard that Aries rules entrepreneurship, if that's what you mean. I guess by traditional astrology that would be the first house. However, I've come to associate Aries with the 5th house, Leo with the first.
Hi-Wouldn't you turn the chart for this? I'd use h7 for quesited and so h10 would be his turned house of home and what goes on there.
If your friend has asked the question, I'd use h4 to represent the home based business.