I do not include labor on my quotes, but it's a different situation. I maintain the clients under monitoring agreements (full service company). I price the average labor to install into the price for each item. I do pass along savings from purchasing kits (i.e. panel, keypad, siren, 3 doors, 1 motion). For example, $35 for a door/window contact. This covers the cost of the contact, the cable and labor. Sometimes I come out a little ahead, sometimes a little behind so it averages out. Down the road, if one needs to be replaced, I'll often "discount" the parts if warranted as I do charge labor on service calls. For friends / family, I'll typically discount a new install about 20%.