If the unit is fully enclosed please take in consideration that our crew must be able to move around the entire structure with ladders and drill tools. We require a minimum of 3′ per side and end. If your unit is going to be installed next to an existing home, we must also have at least 2′ of clearance above the roof line. Example, if you are planning to purchase an 8′ eave unit and it is going to be installed next to an existing home/garage etc., the eave height of your existing structure must be 2′ taller than the eave height of your new metal unit. If upon arrival you are not able to provide these clearances, a labor charge will be added to your bill.