Skylight Installation Cost Calculator
Calculate skylight installation costs by type and size. Includes fixed, vented, electric, and tubular skylights with interior finish options.
How It Works
Choose skylight type
Fixed, vented (manual or electric), tubular, or custom flat-glass options.
Enter size and quantity
Standard sizes (2×4 ft, 2×6 ft) are cheaper than custom. Multiple units save on mobilization.
Add flashing and finishing
Includes interior drywall trim, interior finish, and leak-prevention flashing.
Frequently Asked Questions
How much does skylight installation cost?
Skylight installation costs $800–$2,500 per unit for a standard fixed skylight including the unit, flashing kit, and labor. Vented skylights with manual operation cost $1,200–$3,000. Electrically operated skylights cost $1,800–$4,500. Tubular skylights (sun tunnels) cost $500–$1,200 installed. Interior finishing (drywall, paint) adds $300–$800 per skylight.
What type of skylight is best?
Fixed skylights are the most affordable and leak-resistant — ideal for rooms needing light but not ventilation. Vented skylights add airflow and are great for bathrooms and kitchens. Electric vented skylights close automatically in rain and are worth the premium for ease of use. Tubular skylights are perfect for small dark spaces with limited roof access and are the least expensive option.
Do skylights cause leaks?
Properly installed skylights do not leak. Most skylight leaks are due to improper flashing installation, not the skylight itself. Use manufacturer-matched flashing kits, proper step and counter flashing, and ice and water shield under and around the skylight. Quality brands like Velux offer 10–20 year warranties. Avoid budget skylights — quality units pay back in longevity and leak prevention.
Are skylights energy efficient?
Modern double-pane, low-E skylights are energy efficient. ENERGY STAR certified skylights reduce heat gain in summer and heat loss in winter. South-facing skylights maximize winter solar gain. North-facing skylights provide consistent natural light without summer heat gain. Avoid east or west-facing skylights, which cause excessive afternoon heat gain. Properly sized and placed skylights can reduce lighting costs by 10–15%.