The cost of a telescopic boom lift depends heavily on how much reach you want and how long you rent the machine for. A 40-foot telescopic boom lift diesel dual-fuel model can cost $285, $934 per week, or $2,075 per month. In comparison, a 120-foot model can cost $1,650 per day, $4,790 per week, or $12,007 per month. Keep in mind that prices will vary not only by model, but based on availability, location, time of year, and more. For boom lifts that go beyond 120 feet, you will need to request a quote.