In many markets, a typical residential installation with an 8-12 kW generator and a basic automatic transfer switch falls in the $5,000 to $12,000 range. A larger, more featured setup—14-20 kW, dual fuel, longer gas runs, and advanced transfer logic—can push costs to. The cost of a generator enclosure depends on the materials used. Metal enclosures are more expensive than plastic ones. Wood can be a cheaper option but may not last as long. The size of. Check each product page for other buying options. Installation adds another $3,000 to $6,000 to the total. Up to 60% quieter operation, longer generator life, weather and theft protection in 1 easy to assemble enclosure! Run your generator as long as you need without the neighbors complaining!! Designed for use on these air cooled Standby Backup Generators*: The standby box uses the built in airflow. The fact is that the average cost to install a generator doesn't have to be through the roof.