Noun
sweat equity (countable and uncountable, plural sweat equities)
(idiomatic, real estate, business) An investment of labour, typically by the owner and often his or her family, usually in a small business or personal residence that increases the value of the business or residence.
My wife and I have put a lot of sweat equity into our home: I did the renovations and she did the redecorating.
Sweat equity is the best startup capital. Mark Cuban