How much does it cost to install a skylight in 2026?

Installing a skylight costs $1,500–$5,000 total for most residential projects, including the unit and labor. A basic fixed skylight in a standard application runs $1,500–$2,500 installed. A vented skylight with flashing kit and interior finishing runs $2,500–$4,500. Custom or curb-mounted units in complex roof configurations cost $4,000–$8,000 or more.

What is the difference between a fixed and vented skylight?

A fixed skylight is sealed and provides light only — it cannot open. A vented skylight opens (manually or with an electric motor) to allow airflow and heat escape. Vented skylights cost $300–$800 more than fixed versions of the same size. They're most useful in rooms where heat buildup is a concern: kitchens, bathrooms, and top-floor rooms under flat or low-pitch roofs.

What is a tubular skylight (sun tunnel) and when should I choose one?

A tubular skylight captures light through a small dome on the roof and channels it through a reflective tube to a diffuser in the ceiling below. The installation footprint is small (10–14 inches in diameter), it requires minimal framing, and it works in rooms that can't accommodate a full-size skylight opening — hallways, bathrooms, closets, and rooms below another story. Tubular skylights cost $300–$600 for the unit plus $200–$500 to install — far less than conventional skylights.

Does adding a skylight require a building permit?

Yes — most jurisdictions require a building permit for skylight installations because they involve cutting through the roof deck and altering structural framing. Tubular skylights in some jurisdictions may not require a permit if the roof opening is under a threshold size, but check with your local building department before assuming. Unpermitted roof penetrations can void roof warranties and create disclosure issues at resale.

How do you prevent a skylight from leaking?

Proper flashing is the most critical factor — poor flashing causes the vast majority of skylight leaks, not the unit itself. Manufacturer-specific flashing kits (not generic flashing) should be used, and installation must follow the manufacturer's specifications for your roof material type. On roofs with less than a 3:12 pitch (very low slope), curb-mounted skylights with a raised frame above the roof surface perform significantly better than self-flashing units.

Skylight Installation Cost Guide 2026: Fixed, Vented, and Tubular — What Each Type Costs

September 24, 2026 · Cost Guide · 6 min read

Skylights add natural light in ways no window can match — they illuminate interior rooms, reduce daytime lighting costs, and make spaces feel larger. The total installed cost ranges from $1,500 for a basic fixed unit to $8,000+ for a large vented skylight on a complex roof. Most of the cost variance comes from factors homeowners don't anticipate: roof pitch, framing modification, shaft construction through attic space, and whether the room below needs interior drywall work after installation.

Three Types of Skylights: What Each One Does and Costs

Fixed Skylights

Fixed skylights don't open. They admit light and provide a view of the sky but offer no ventilation. They're less expensive than vented versions, simpler to seal properly (no moving parts), and appropriate for most rooms where light — not airflow — is the goal.

Unit cost: $150–$800 for standard residential sizes (14x14 to 22x46 inches) from Velux, FAKRO, and other manufacturers
Installation labor: $500–$1,000 for straightforward installations on standard pitched roofs
Total installed: $700–$1,800 for a standard project; $2,500–$4,500 for large or complex configurations

Vented Skylights

Vented skylights open to allow hot air to escape — particularly useful in kitchens, bathrooms, and top-floor rooms that trap heat. They're available in manual crank operation or electric motors with rain sensors that automatically close if precipitation begins. Electric vented skylights add $300–$500 to the unit cost over manual versions.

Unit cost: $400–$1,500 for standard sizes, depending on size and whether manual or electric
Installation labor: $600–$1,200 — slightly more than fixed due to additional sealing requirements around the moving frame
Total installed: $1,200–$3,500 for a standard project

Tubular Skylights (Sun Tunnels)

Tubular skylights are the underused option — far less expensive than conventional skylights, far less invasive to install, and appropriate for a wider range of rooms. A small dome on the roof captures sunlight and reflects it through a highly reflective tube (typically 10, 14, or 21 inches in diameter) to a diffuser in the ceiling below.

Unit cost: $200–$600 depending on tube diameter and length required
Installation labor: $150–$500 — typically a half-day job, no roof framing required
Total installed: $350–$1,100
Best for: Hallways, interior bathrooms without exterior walls, closets, laundry rooms, and any space where a full skylight opening isn't possible or practical

What Drives the Wide Cost Range

Roof Pitch and Material

Installation difficulty varies significantly with roof configuration:

Standard asphalt shingle, 4:12–8:12 pitch: Most straightforward installation. Manufacturer flashing kits are widely available, and most roofing contractors are familiar with the process. This is the baseline for most cost estimates.
Metal roofing: Requires specialized flashing — not the standard kit for asphalt shingles. Labor is more complex and must be performed carefully to preserve metal roof warranties. Adds $200–$600 in labor.
Tile roofing (clay or concrete): Tile must be removed and replaced around the installation area. Adds $300–$800 in labor and increases the risk of tile breakage during installation.
Low-slope or flat roofs (less than 3:12 pitch): Self-flashing skylights don't work reliably on low-slope roofs — water doesn't drain fast enough. Curb-mounted installations (where the skylight sits above a raised frame) are required, adding $300–$600 to the job.

Shaft Construction

In most installations, there's attic space between the roof and the ceiling below. A light shaft must be built to channel light from the roof opening to the ceiling opening. Shaft construction adds $500–$2,000 to the project depending on:

The distance between roof and ceiling (a tall attic requires more framing)
Whether the shaft is straight (simplest), angled (more complex), or splayed outward (most light distribution, most labor-intensive)
Whether insulation around the shaft must be rebuilt for energy code compliance

Rooms with finished attics or cathedral ceilings don't need a separate shaft — the skylight installs directly through the finished ceiling material, which reduces this cost but requires more careful interior finishing work.

Interior Finishing

After installation, the drywall or plaster around the shaft opening must be finished — taped, mudded, painted — to match the existing ceiling. Homeowners who handle this themselves save $300–$800; hiring a drywall finisher adds this back to the project cost.

Flashing: Why It's the Most Important Part

Most skylight leaks are caused by improper flashing, not defective units. Flashing is the waterproofing system that seals the gap between the skylight frame and the roof surface. Using a manufacturer-specific flashing kit (designed for your roof material type) rather than generic flashing materials is the single most important quality decision in a skylight installation.

Questions to ask your contractor before hiring:

Are you using manufacturer-supplied flashing kits or generic materials?
Do you have experience installing skylights on this specific roof material?
Will the installation comply with the manufacturer's warranty requirements? (Improper installation voids most skylight warranties.)

Energy Efficiency Ratings: What to Look For

Skylights carry NFRC ratings similar to windows. The key numbers:

U-factor: Thermal resistance. Lower is better. Look for U-factor below 0.35 for most climates; below 0.30 for cold climates.
Solar Heat Gain Coefficient (SHGC): How much solar heat enters the home. A lower SHGC (0.25–0.30) is better in hot climates to reduce cooling loads; a higher SHGC (0.40–0.55) can be useful in cold climates to collect passive solar heat from south-facing skylights.
Low-E coatings: Standard on most quality skylights. These coatings reflect infrared heat — keeping heat in during winter, heat out during summer — without meaningfully reducing visible light transmission.

Energy Star-qualified skylights may qualify for the federal residential clean energy credit (currently 30% of costs through 2032 for eligible energy-efficient improvements). Check current IRS guidance on applicability before purchasing.

Placement Decisions: Orientation and Positioning

Where you cut matters as much as what you install:

North-facing skylights: Consistent, diffuse light throughout the day. No glare. Best for art studios, reading rooms, and spaces where even light quality is more important than total light volume.
South-facing skylights: Maximum light and winter heat gain. Can cause overheating in summer without a low-SHGC glass specification or an interior blind.
East-facing: Morning light, afternoon shade. Good for bedrooms and breakfast rooms.
West-facing: Afternoon glare and heat. Generally not recommended without solar-control glazing.

Placing skylights over interior walls (not exterior walls) maximizes their impact — a skylight that illuminates an interior hallway that receives no other natural light creates more perceived value than one that adds to a room already served by exterior windows.

Common Mistakes to Avoid

Installing over a rafter: Skylights require cutting through roof rafters, which requires structural header framing. An installer who doesn't properly header the opening creates a structural problem. Verify your contractor understands this requirement.
Ignoring ventilation needs in bathrooms: A vented skylight in a bathroom is far more effective at reducing humidity than a fixed skylight. The upfront cost difference ($300–$600) is typically worth it for moisture management.
Choosing size over placement: A smaller skylight in an optimal location often delivers better light distribution than a large skylight in a poor one. A contractor who only pushes for larger units may not be optimizing for your actual goals.

For context on how skylight work fits into a broader renovation — including permit requirements and contractor selection — our home renovation permits guide covers what typically requires a permit in roof and structural projects. And if you're weighing multiple renovation options, our guide to renovations with the best ROI provides a framework for prioritizing investments.

Finding a Contractor for Skylight Installation

Skylight installation sits at the intersection of roofing and carpentry. Roofing contractors who work with skylights regularly have the flashing expertise; general contractors often manage the whole project including shaft construction and interior finishing. For a tubular skylight, a general handyman with roofing experience is often sufficient. For a full conventional skylight with shaft work and interior finishing, hire a contractor who can demonstrate recent skylight installations — not just roofing experience generally.

Browse our home remodeling contractor directory by city or search for home remodelers near you who list roofing or interior renovation as specialties.

Frequently Asked Questions

How much does it cost to install a skylight in 2026?: Installing a skylight costs $1,500–$5,000 total for most residential projects, including the unit and labor. A basic fixed skylight in a standard application runs $1,500–$2,500 installed. A vented skylight with flashing kit and interior finishing runs $2,500–$4,500. Custom or curb-mounted units in complex roof configurations cost $4,000–$8,000 or more.
What is the difference between a fixed and vented skylight?: A fixed skylight is sealed and provides light only — it cannot open. A vented skylight opens (manually or with an electric motor) to allow airflow and heat escape. Vented skylights cost $300–$800 more than fixed versions of the same size. They're most useful in rooms where heat buildup is a concern: kitchens, bathrooms, and top-floor rooms under flat or low-pitch roofs.
What is a tubular skylight (sun tunnel) and when should I choose one?: A tubular skylight captures light through a small dome on the roof and channels it through a reflective tube to a diffuser in the ceiling below. The installation footprint is small (10–14 inches in diameter), it requires minimal framing, and it works in rooms that can't accommodate a full-size skylight opening — hallways, bathrooms, closets, and rooms below another story. Tubular skylights cost $300–$600 for the unit plus $200–$500 to install — far less than conventional skylights.
Does adding a skylight require a building permit?: Yes — most jurisdictions require a building permit for skylight installations because they involve cutting through the roof deck and altering structural framing. Tubular skylights in some jurisdictions may not require a permit if the roof opening is under a threshold size, but check with your local building department before assuming. Unpermitted roof penetrations can void roof warranties and create disclosure issues at resale.
How do you prevent a skylight from leaking?: Proper flashing is the most critical factor — poor flashing causes the vast majority of skylight leaks, not the unit itself. Manufacturer-specific flashing kits (not generic flashing) should be used, and installation must follow the manufacturer's specifications for your roof material type. On roofs with less than a 3:12 pitch (very low slope), curb-mounted skylights with a raised frame above the roof surface perform significantly better than self-flashing units.