Once I outsourced my side-project, since the pay per hour ratio worked better for me, compared to what I earn, combined with the complexity of that project. The "only" thing I had to do is write specs.

The specs took me 3 weeks to write ( finding a lot of logical "bugs" in my project ), but the detail I went to ( SQL schema suggestions, framework suggestions, front-end plugins suggestions, ready pixel perfect design with different states, urls for the different pages, etc. ) was one of the biggest benefit for the final price. The company that took the project estimated 4 months and delivered it in 3 and half. They said those were the best specs they've ever seen.

Moral of the story : Do full specs before you start coding ( I know it's boring ).