Skylight installation costs in Middle Island typically range from $1,000 to $4,000 per unit, depending on size, type, and installation complexity. The skylight itself runs $500 to $2,500, with installation adding another $500 to $1,500.Fixed skylights cost less than vented models. Installations on existing roofs cost more than new construction. If we need to modify framing or handle complex flashing situations, that affects pricing too.We provide detailed written estimates that break down every cost so you know exactly what you’re paying for. No surprise bills, no hidden fees.