Dethatching. - $55 for the 1st 2000 sq ft. - $10 for every 1000 sq ft. after that (3000 sq ft. yard would cost $65) - Most yards will be between $55 and $75. Dethatching is done at the same time as the Aeration. It is very beneficial to do this once a year in the spring. $10 for every 1000 sq ft. after that (3000 sq ft. yard would cost $65) - Most yards will be between $55 and $75.