Residential Replacement

📖 Overview

The most straightforward residential scenario is covered under [Replace fixed skylight (same size)](https://contractorsplanet.com/?service=skylight&subcat=skylight-replacement&subsubcat=residential-replacement&subsubsubcat=replace-fixed-skylight-same-size). A fixed skylight — one with no operating sash — is a sealed glazing unit mounted over a curb or set into a self-flashing deck frame. When the replacement unit matches the rough-opening dimensions of the original (typically a standard Velux or Andersen size such as 21″ × 46″ or 30″ × 46″), the contractor can reuse the existing curb or deck frame, saving both labor and roofing material costs. This is the fastest, lowest-disruption residential skylight replacement available, often completed in a single half-day visit.

Homeowners who want ventilation — passive or powered — should look at [Replace vented skylight](https://contractorsplanet.com/?service=skylight&subcat=skylight-replacement&subsubcat=residential-replacement&subsubsubcat=replace-vented-skylight). Vented units open on a pivot or hinged sash to allow hot air to escape, and solar-powered models from Velux's Fresh Air series or Fakro's FTP series can open and close automatically via rain sensor. Replacing a fixed unit with a vented one — or swapping an old manual vented unit for a solar-powered model — may require minor curb modification and always requires fresh flashing installation, since the heavier sash changes load distribution on the curb.

Water intrusion is the most urgent residential skylight complaint, and it gets dedicated treatment under [Replace leaking skylight](https://contractorsplanet.com/?service=skylight&subcat=skylight-replacement&subsubcat=residential-replacement&subsubsubcat=replace-leaking-skylight). Leaks can originate from failed step flashing, a cracked or degraded condensation gutter, a compromised glazing seal, or frost condensation on single-pane glass — each requiring a different remedy. Many homeowners assume a drip inside the home means the skylight unit itself is broken, but in roughly 40–50% of residential leak calls the glazing unit is intact and the failure is in the surrounding flashing or counterflashing. A qualified contractor will distinguish between a unit failure and a flashing failure before quoting a full replacement.

The most dramatic — and increasingly common — residential upgrade is covered under [Replace old acrylic dome with new glass skylight](https://contractorsplanet.com/?service=skylight&subcat=skylight-replacement&subsubcat=residential-replacement&subsubsubcat=replace-old-acrylic-dome-with-new-glass-skylightle). Acrylic and polycarbonate bubble domes were the residential standard through the 1980s and early 1990s; they yellow, craze, and crack with UV exposure, and their single-layer construction delivers poor thermal performance — typically U-factors above 1.0, versus 0.28–0.48 for modern dual-pane low-e glass units. Swapping a dome for a flat or low-profile glass unit almost always involves curb reconstruction, new flashing, and interior trim work, making it the highest-cost residential replacement scenario but also the one that delivers the greatest improvement in energy efficiency, aesthetics, and leak resistance.

From a regulatory standpoint, residential skylight replacements in most U.S. jurisdictions are governed by the International Residential Code (IRC) Chapter 24, which sets minimum glazing requirements — tempered or laminated safety glass for units within 18 inches of a walking surface or in sloped overhead applications — and by local energy codes that may require minimum ENERGY STAR certification (currently U-factor ≤ 0.45 and SHGC ≤ 0.25 in most Climate Zones). California's Title 24 and Washington State's energy code are among the strictest; homeowners in those states should confirm compliance before selecting a unit. A building permit is required in most jurisdictions when the structural opening changes size or when the replacement is part of a larger roofing project; like-for-like swaps on existing curbs are often permit-exempt, but this varies by municipality.

When evaluating related trades, keep in mind that a roofing contractor handles the waterproofing and flashing work around any skylight, so complex replacements — especially on tile, slate, or metal roofs — benefit from a roofer who also installs skylights, rather than a skylight-only specialist. If interior drywall, [insulation](https://contractorsplanet.com/), or [painting](https://contractorsplanet.com/) is disturbed during shaft work, coordinating those trades in advance prevents scheduling gaps. For leaks that have already caused ceiling or structural damage, loop in a [Water & Mold Remediation](https://contractorsplanet.com/) contractor before the skylight replacement begins, not after.

✅ What it covers

• Removing the existing skylight unit, flashing, and any deteriorated curb material
• Inspecting the rough opening framing for rot, mold, or structural damage before proceeding
• Selecting a replacement unit that matches or improves on the original's size, glazing type, and thermal rating
• Installing a new or rebuilt curb if the existing one is warped, rotted, or changing unit profile
• Applying manufacturer-specific integrated flashing kits (e.g., Velux EDL, EDW, or EDP series by roof type)
• Seating and fastening the glazing unit per IRC Section R308.6 overhead glazing requirements
• Resealing the interior shaft or light tunnel, repairing drywall, and repainting as needed
• Testing the unit operation (on vented models) and confirming no visible light gaps or condensation
• Conducting a water-test with a garden hose before closing out the job
• Providing the homeowner with the manufacturer warranty card and local permit close-out documentation

💵 Typical cost range

Residential skylight replacement costs typically run $900–$1,800 for a straightforward like-for-like fixed-unit swap on an asphalt shingle roof, using a standard Velux FS or Andersen Tilt-Wash unit with an integrated flashing kit. Vented replacements add $200–$600 for the upgraded unit and any curb modification. Acrylic-dome-to-glass conversions are the most expensive scenario — expect $1,800–$4,500 depending on curb reconstruction complexity, interior shaft work, and roof type. Tile or slate roofs add $300–$800 in labor over shingle pricing because individual tiles must be removed and reset. Interior finish repairs (drywall, paint, trim) typically add $150–$400 if the shaft was damaged by a prior leak. Labor alone generally runs $350–$900 depending on roof pitch and region; material costs for a quality dual-pane low-e unit range from $400 to $1,800.

🛡️ Hiring tips

• Verify the contractor installs manufacturer-specific integrated flashing kits — generic step flashing cut on-site is the leading cause of post-replacement leaks
• Ask whether they carry roofing liability coverage in addition to general liability, since the waterproofing work is a roofing function
• Confirm the replacement unit meets your local energy code (ENERGY STAR U-factor and SHGC requirements) before ordering
• Get a written scope that separates unit cost, flashing kit cost, curb work, and interior finish repair so you can compare quotes line by line
• Check that the contractor pulls a permit if your municipality requires one for the specific replacement type — unpermitted work can complicate home sales
• Ask for a water-test at job completion before final payment, not just a visual inspection
• For acrylic-dome replacements, request photos of the curb framing before the new unit goes in so you can see the condition of the structural opening
• Check references specifically for the roof type on your home — tile and metal roofs require specialized flashing techniques that not every skylight installer has mastered

More frequently asked questions

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