For our residential maintenance we have one foreman to two laborers or one laborer - depending on the crew.
In the fall we add labor to help with leaf removal. If we get up to over 5 men per crew, we have to make sure there is a strong leadman on the crew to help direct the less experienced labor.
Installation - one foreman and two laborers, typically. If the job is manual labor intensive, we'll add another laborer.
Lawn Lad, Inc.