Skylight Installation in Chicago, IL

What Is Skylight Installation?

A skylight is a roof-mounted window that brings natural daylight into your home without sacrificing weatherproofing. Installation requires creating an opening in your roof deck and sheathing, then securing a frame with proper flashing to keep water out.

The weak point on most Chicago roofs is where the skylight meets surrounding asphalt or architectural shingles. Step flashing and counter-flashing direct water away from the opening. We offer fixed skylights (stationary glass) and vented skylights (motorized operable units with solar-powered blinds), as well as sun tunnels for routing light through interior walls.

Each type demands different waterproofing methods and building code compliance for your property.

Materials and Methods

A proper skylight installation includes these components and labor steps:

• The skylight frame (VELUX, Solatube, or similar branded units)
• Rough opening cut into the roof deck and sheathing
• Support framing at rafters and joists
• Ice-and-water shield or synthetic underlayment for moisture protection
• Flashing and counter-flashing to channel water away
• Step flashing where the frame meets asphalt or architectural shingles
• Drip edge to direct water into the gutter system
• Sealant, roof cement, and caulk to seal all joints
• Insulation around the frame for energy efficiency
• Vapor barrier for moisture control
• Ring-shank nails to secure shingles and prevent back-pull in Chicago wind

The work involves removing existing shingles and inspecting the roof deck for rot or decay. We install the skylight with fasteners and waterproof every edge. Proper substrate preparation prevents long-term leaks.

We use roof cement, adhesive, and sealant methods that match Chicago's freeze-thaw cycles. Ridge cap ventilation remains intact to prevent condensation buildup. All debris is collected in a dumpster for safe removal.

Cost and Timeline

Skylight installation in Chicago typically ranges from $2,000 to $6,000 depending on frame type, size, and roof pitch. Labor takes one to two days. A free roof inspection helps us estimate accurately and assess your roof structure, rafter spacing, and existing conditions.

Warning Signs You Need Skylight Installation or Repair

• Water stains on the ceiling or drywall below an existing skylight frame
• Visible rot or decay around the roof opening or decking
• Flashing that is corroded, dented, or missing sealant
• Interior condensation or fogging in the glass during freeze-thaw cycles
• Daylight visible around the frame edges—a broken seal
• Dark rooms relying on daytime electric lighting (new skylight consideration)
• Ice dam formation around the skylight during Chicago winters
• Energy bills that would benefit from natural daylighting

Our Installation Process

1. Roof Inspection and Measurement — We assess your roof pitch, deck condition, rafter and joist spacing, and existing shingles (asphalt, architectural, or specialty types). We verify building code requirements and measure the opening for proper flashing and insulation fit.
2. Rough Opening — We cut the roof opening carefully, removing shingles, underlayment, and sheathing using a roofing shovel and pry bar. We inspect the decking for rot and reinforce framing at rafters. All debris is removed immediately.
3. Flashing and Waterproofing — We install ice-and-water shield around the opening and position the skylight frame securely. Step flashing and counter-flashing are sealed with roof cement and sealant to block water intrusion. This is the most critical step—most leaks start here.
4. Shingles and Sealing — We re-nail surrounding shingles, apply sealant to all edges, and verify drainage into the gutter system. Drip edge is checked for proper water direction into downspouts.
5. Interior Finishing — We install insulation and vapor barrier around the frame opening. Motorized blinds or venting systems are tested and adjusted for operation.
6. Final Inspection — We inspect from inside and outside, verify flashing integrity and sealant cure, and walk through the completed installation before you accept the work.

Local Chicago Weather Considerations

Skylights in Chicago must withstand heavy snow load, ice dams, and Lake Michigan wind gusts. Our flashing and counter-flashing are sized for the steep-pitch roofing common in Chicago neighborhoods—Wicker Park, Lincoln Park, Pilsen, Bridgeport, Logan Square.

We ensure roof ventilation (soffit vents, ridge vents) is maintained to prevent condensation during winter freeze-thaw cycles. Ice-and-water shield is non-negotiable on Chicago roofs due to ice dam formation. We account for summer thunderstorm damage from hail and wind uplift, which affects flashing durability and sealant integrity.

Warranty and Insurance

We warrant our workmanship for 5 years. The skylight frame carries a 10-year manufacturer warranty. We are licensed, bonded, and insured. We assist with homeowner insurance claims for weather-related damage to your skylight or roof.

Frequently Asked Questions

What if my roof has metal panels or slate tiles instead of asphalt shingles?

Metal roofing, standing-seam panels, and slate or tile require specialized flashing and fastening methods. We have experience with all roof types—asphalt, metal, tile, cedar shake. Building code requirements differ by material.

Will a skylight cause condensation in winter?

Modern skylights have insulated glass and thermal frames that minimize temperature difference. A vapor barrier and proper ventilation prevent interior condensation. Winter humidity levels and soffit vent placement matter too.

What's the difference between fixed and vented skylights?

Fixed skylights are stationary and provide light only. Vented skylights have motorized or manual blinds and can open for ventilation. Vented units cost more but offer summer heat relief and better moisture control.

Does a skylight void my roof warranty?

No, if installed by a licensed roofing contractor. Improper installation can create leaks affecting surrounding shingles and decking. Our installation method preserves your roof warranty and protects the surrounding roofline.

How do you prevent leaks in heavy rain or snow?

Proper step flashing, counter-flashing, ice-and-water shield, and sealant create a complete waterproof seal. Chicago's heavy snow demands flashing overlap extending 4-6 inches beyond the skylight opening to handle water wicking and runoff.