Skylight installation costs vary based on the size, type, and complexity of your project. A basic fixed skylight installation typically ranges from $1,500 to $3,500, while vented skylights with more complex installation requirements can cost $2,500 to $5,000 or more.The total cost includes the skylight unit, flashing materials, interior finishing work, and labor. If you’re installing skylights during a roof replacement, you can often save on labor costs since the roof is already being worked on.Remember that quality installation is crucial—poor installation can lead to leaks and repairs that cost more than the original project. We provide detailed estimates that break down all costs upfront, so you know exactly what you’re paying for.