In the past decade greenhouses have become as very hot home improvement product and project. As the baby boomer generation slips into retirement they are looking for ways to keep busy, physically fit, and enjoy life. Greenhouse hobby gardening provides them with exactly what they are seeking. There are various approaches that can be taken for starting a greenhouse installation business. These approaches include: Designing, building, selling, and installing greenhouses. Designing and selling U-Install-It greenhouse kits. Selling and installing greenhouses for existing manufacturers. Profit potential range is $20,000 per year part-time and $50,000+ per year full-time.