Brooklyn Skylight Replacement Services You Can Trust

Skylight replacement in Brooklyn typically costs between $1,800 and $5,200 per unit, depending on size, glass package, and whether the curb and flashing need replacement. Most homeowners expect to “just swap the skylight,” but here’s what catches people off guard: calling a window company to replace the glass while leaving 25-year-old flashing, curbs, and roof details untouched. A month later, water runs down the walls around a brand-new skylight because the old waterproofing never got addressed. This is exactly why you need a roofing contractor who specializes in skylight replacement-someone who treats the entire assembly as a mini roof project, not just a glass swap.

I’m Hannah Delgado, and I’ve been replacing skylights on Brooklyn rowhouses, brownstones, and lofts for twelve years. I grew up in a Sunset Park contracting family, patching leaks on flat roofs before going through manufacturer training to design and install complete skylight systems. What I’ve learned is that proper skylight replacement means upgrading light, insulation, and waterproofing all at once-not just dropping in new glass and hoping the old framework holds up.

When Repair Isn’t Enough: Clear Signs You Need Full Replacement

The biggest question homeowners ask: can this skylight be repaired, or does it really need replacement? Here’s how I decide on-site.

Cracked or shattered glass is the obvious one-one impact from a falling branch or enough expansion-contraction cycles, and you’re looking at full replacement. But what surprises people are the less visible failures: failed seals between double-pane glass that cause constant fogging you can’t wipe away. That’s moisture trapped inside the sealed unit, and no amount of cleaning fixes it. The only solution is new insulated glass or a complete skylight assembly.

Then there’s frame deterioration. Wood frames rot from repeated leak exposure, especially around the bottom corners where water pools. Aluminum frames corrode and lose their weatherstripping channels. Vinyl frames crack in Brooklyn winters after 20-25 years of freeze-thaw cycles. When the frame itself is compromised, you can’t just re-seal-you need new structure.

The third category is recurring leaks that return every rain even after repair attempts. I see this constantly: a handyman re-caulks the skylight, it’s fine for two months, then water stains reappear on the ceiling. That tells me the flashing system under the roofing material has failed, or the curb is no longer level and square. At that point, you’re replacing the entire skylight-to-roof interface, not patching surfaces.

Finally, energy loss you can feel-standing under a skylight in January and feeling cold air wash over you, or noticing ice forming on the inside glass. Old single-pane or poorly insulated units can’t meet modern energy standards. Replacement with high-performance glass typically cuts heat loss by 60-70% and pays for itself in comfort and lower heating bills.

On a Bed-Stuy brownstone project last winter, the homeowner had tried three different contractors to stop a skylight leak over her stairwell. Each one re-caulked or re-flashed from the outside. The problem? The skylight curb had rotted through on one side and was no longer sitting flat on the roof deck. Water entered through the gap underneath, then traveled along the interior before dripping down the wall. We replaced the entire assembly-curb, flashing, and skylight unit-and that leak finally stopped. That’s the kind of situation where partial repairs just don’t work.

Fixed vs. Venting Skylights: Choosing the Right Replacement

When you’re replacing a skylight, you have a fundamental choice: fixed (non-opening) or venting (operable). Your decision affects cost, function, and installation complexity.

Fixed skylights are sealed units that don’t open. They cost less-typically $1,800-$3,200 installed for standard residential sizes-and they’re simpler because there are no moving parts, motors, or controls to fail. They work perfectly for bringing light into dark center areas of rowhouses: stairwells, hallways, interior bathrooms. The sealed design makes them slightly more weatherproof since there’s no operable hardware creating potential leak points.

Venting skylights open to provide natural ventilation and are ideal for kitchens, bathrooms, or top-floor bedrooms where heat builds up. You can choose manual operation (a pole or crank) or motorized/solar-powered units with remote controls and rain sensors that automatically close when water is detected. Venting units run $2,800-$5,200 installed, depending on size and features. The higher cost covers the operating mechanism, more complex flashing details, and additional labor for electrical connections if you go motorized.

Here’s what I tell clients: if the room has other windows and you mainly want daylight, go fixed. If you’re trying to exhaust heat and moisture, especially in a bathroom or kitchen without great ventilation, the venting option is worth the extra investment. I also recommend venting units for top floors in multi-story brownstones where summer heat concentrates-opening a skylight creates a stack effect that pulls hot air up and out.

On a Park Slope project in a gut-renovated rowhouse, we installed three skylights: two fixed units over the stairwell for light, and one large venting skylight over the master bathroom. The homeowner initially wanted all fixed to save money, but after I explained how much steam and humidity that bathroom would generate-and how a venting skylight would handle it better than a wall exhaust fan-she upgraded. A year later, she told me it was one of her best decisions because the room never feels stuffy, even after long showers.

Glass Upgrades That Actually Matter

The glass package you choose determines how much heat, light, and UV radiation enters your home. This isn’t just about clarity-it’s about comfort and energy bills.

Standard double-pane glass with Low-E coating is the baseline for most skylight replacements. The Low-E (low-emissivity) coating reflects heat back into the room in winter and blocks radiant heat from entering in summer. It filters about 40% of heat gain while allowing plenty of visible light through. This package works well for most Brooklyn applications and typically adds $200-$350 to the skylight cost.

High-performance glass with argon or krypton gas fill between panes boosts insulation further. The inert gas slows heat transfer better than regular air, improving the U-factor (the rate of heat loss). If you’re replacing a skylight in a living space where you spend a lot of time-a kitchen, home office, or bedroom-this upgrade ($300-$500 additional) delivers noticeable comfort improvements.

Laminated or impact-resistant glass adds a layer of protection, especially valuable on flat roofs or low-slope installations where people occasionally walk or where falling debris is a concern. The laminated layer holds glass together if cracked, preventing dangerous shards from falling into the room below. I recommend it for skylights over beds, dining tables, or kids’ play areas. Cost addition: $250-$450.

Tinted or solar control glass reduces heat gain and glare in south-facing or west-facing installations. If your skylight faces afternoon sun and the room overheats in summer, tinted glass blocks 50-70% of solar heat while dimming incoming light slightly. Some homeowners love the cooler room temperature; others find it too dark. I usually recommend testing tint levels with samples before committing, because it’s a permanent choice that affects the room’s brightness year-round.

On a Williamsburg loft conversion, the client had a massive 4×6 skylight over the main living area with southern exposure. The original single-pane unit turned the space into a greenhouse every afternoon. We replaced it with double-pane Low-E glass with a light bronze tint and argon fill. The room stayed 8-10 degrees cooler in summer, the glare on the TV disappeared, and winter heating costs dropped noticeably. Sometimes the right glass package makes a bigger difference than the skylight brand.

Curbs, Flashing, and the Roofing Connection

Here’s where skylight replacement separates from simple glass swaps: the skylight sits on a curb (a raised frame) that penetrates your roof, and that entire assembly must be flashed and integrated into your roofing system. Get this part wrong, and even a perfect skylight will leak.

The curb is the wood or metal frame that raises the skylight above the roof surface. It needs to be level, square, and structurally sound. Many leak problems stem from deteriorated curbs-wood that’s rotted, warped, or pulling away from the roof deck. When we replace skylights, we inspect the curb thoroughly. If it’s compromised, we rebuild it with pressure-treated lumber and make sure it’s properly tied into the roof framing. Trying to mount a new skylight on a failing curb is like putting new tires on a car with a bent axle.

Flashing is the waterproofing system that connects the curb to your roof. It’s typically a combination of metal step flashing along the sides, head flashing at the top, and a pan or apron flashing at the bottom. On flat roofs with membrane systems (EPDM, TPO, or modified bitumen), flashing involves fabric and mastic details that integrate with the membrane. This is roofing work, not window installation, and it requires understanding how water flows across your specific roof type.

Brooklyn buildings use three main roof types, and each demands different flashing approaches:

• Asphalt shingle roofs (common on single-family homes and some townhouses): step flashing weaves into the shingle courses, creating a layered barrier. We install new flashing during skylight replacement and tie it into the existing shingle pattern.
• Flat membrane roofs (standard on brownstones and rowhouses): the skylight curb sits on the roof deck, and the membrane is cut, dressed up the curb sides, and sealed with compatible adhesives. We often add a cricket (a small peaked structure) on the upslope side to divert water around the skylight.
• Metal roofs (less common, but found on historic buildings): custom metal flashing is soldered or mechanically fastened around the curb, matching the roof’s material and profile. This is specialized work requiring metal fabrication skills.

When a homeowner calls me for skylight replacement, I always inspect the roof area around the unit. If the roofing material is failing-cracked shingles, blistered membrane, loose seams-I recommend addressing that at the same time. It makes no sense to flash a new skylight into a roof that needs replacement in two years. Better to coordinate both projects and ensure proper integration from the start.

On a Carroll Gardens brownstone, we replaced two skylights on a 15-year-old EPDM rubber roof. One skylight was leaking badly; the other was just old and foggy. When I got up there, I found the rubber membrane was splitting along seams and losing adhesion around both curbs. We ended up replacing a 12×16 section of membrane around the skylights, rebuilding both curbs, and installing new skylight units. The cost was higher than a simple skylight swap, but the owner got a completely waterproof roof section that’s good for another 15-20 years. That’s the kind of comprehensive approach that prevents callbacks and repeat leaks.

Interior Finishes: Shafts, Trim, and Light Wells

The visible part of skylight replacement isn’t just the glass-it’s the light shaft or well that connects the roof opening to your ceiling. This interior work affects the amount of light entering the room and the finished appearance.

If you’re replacing a skylight in the same location, the existing shaft usually stays in place. We inspect it for water damage, mold, or insulation problems, make any necessary repairs, then repaint after the new skylight is installed. Sometimes we recommend splaying the shaft walls outward toward the room-angling them instead of keeping them vertical-which spreads light better and makes a small skylight feel much brighter.

When installing a new skylight in a different location, we build the shaft from scratch, frame it into the ceiling joists and roof rafters, insulate it properly, and finish it with drywall and trim. This adds $800-$1,600 to the project depending on shaft depth and finish complexity. In Brooklyn brownstones where the roof might be 12-18 inches above the top-floor ceiling, a shallow shaft is simple. In buildings with cathedral ceilings or where the skylight opens into a floor below, the shaft can be several feet deep and requires more extensive framing and finishing.

Insulation is critical inside the shaft. An uninsulated or poorly insulated shaft creates a cold column of air in winter and a heat tunnel in summer. We use rigid foam board or spray foam along shaft walls, ensuring continuous insulation from the skylight frame down to the ceiling opening. This prevents condensation and eliminates the uncomfortable drafts homeowners feel when standing under old skylights.

Trim options range from simple painted wood to more decorative profiles that match your interior style. For a clean contemporary look, we often use minimal square trim. For traditional brownstones, wider casings with crown molding tie the skylight into the home’s existing millwork. The trim choice is cosmetic but contributes significantly to whether the skylight looks like a professional installation or an afterthought.

The Replacement Process: What Actually Happens

Understanding the installation sequence helps set realistic expectations for timeline, access, and disruption.

Day one is roof prep. We set up scaffolding or roof staging if needed, remove the old skylight unit, inspect and repair or replace the curb, and install new flashing. This is the critical waterproofing phase. We won’t leave an open hole at the end of the day-if the skylight isn’t fully installed, we install temporary weather protection. Most single-skylight replacements complete in one day if weather cooperates and we don’t discover hidden structural issues.

Interior work happens simultaneously or immediately after. While the new skylight is going in from above, we’re inside inspecting the shaft, making drywall repairs, adding insulation, and preparing surfaces for finishing. If the shaft needs rebuilding, that extends the timeline to 2-3 days total.

Final details-trim installation, paint touch-ups, interior and exterior caulking, cleanup-usually happen within a few days after the skylight is weathertight. We schedule a final walkthrough where I show you how to operate venting skylights, explain maintenance basics, and make sure you’re satisfied with the light, finish quality, and overall result.

Access requirements vary by building type. For single-family homes with simple roof access, we use ladders and standard safety equipment. For multi-story brownstones or buildings where we can’t safely ladder from the ground, we set up scaffolding or use a lift. Flat roofs are generally easier to work on than steep-pitched roofs, but they require more careful waterproofing because water doesn’t shed as quickly.

Weather affects scheduling. We don’t install skylights in active rain or snow, and we avoid extremely hot days when roofing adhesives and sealants don’t cure properly. Spring and fall are ideal. Summer works fine for morning installations before peak heat. Winter is possible on dry, moderate days, though some materials have temperature limitations. I always check the three-day forecast before scheduling skylight work-there’s no point rushing if rain is predicted the day after we open the roof.

Cost Factors and What You’re Really Paying For

Skylight replacement pricing isn’t just about the unit itself-it’s about the labor, materials, and expertise required to make that skylight work as part of your roof system.

A basic fixed skylight replacement with a standard curb, new flashing, and minimal interior finishing runs $1,800-$2,600 for a 2×4 or 2×3 unit. That includes removal of the old skylight, curb inspection and repair (if structurally sound), new flashing integrated into your existing roof, the new skylight unit with standard Low-E glass, and basic interior trim touch-up.

Venting skylight replacement with motorized operation, upgraded glass, and curb rebuilding costs $3,200-$5,200. The higher price reflects the more complex unit, electrical work for motor controls, complete curb reconstruction with pressure-treated lumber, and premium flashing details.

Additional costs that commonly arise:

• Roof repairs around the skylight: $400-$900 if membrane or shingles need patching or replacement in the work area
• Shaft insulation and drywall repair: $300-$700 depending on depth and extent of damage
• Full shaft reconstruction: $800-$1,600 when building a new light well from scratch
• Larger or custom-size units: add 25-50% to base pricing for units over 4×6 or non-standard dimensions
• Structural reinforcement: $600-$1,200 if roof framing needs sistering or additional support to carry the skylight load

What you’re really paying for is waterproofing expertise and long-term reliability. A window installer might charge less because they’re only thinking about the glass unit. A roofing contractor charges appropriately because we’re thinking about flashing, roof integration, water management, and making sure this installation doesn’t leak five years from now when we’re not around to fix it quickly.

On a Bay Ridge project, the homeowner initially got a quote from a general handyman for $1,100 to replace her kitchen skylight. It seemed like a great deal until I explained what wouldn’t be included: no curb inspection, minimal flashing work, no warranty on the roofing connection, and no follow-up if leaks occurred. She chose our $2,400 proposal instead. Two years later, after several major rainstorms, she called to say it had never leaked once and the room felt noticeably warmer in winter. That’s the difference between a cheap skylight swap and a proper replacement with full roofing integration.

Maintenance and Longevity

A properly installed skylight should last 20-30 years with minimal maintenance. Here’s what extends that lifespan.

Clean the glass once or twice a year from inside, and if safely accessible, from outside as well. Dirt, pollen, and debris reduce light transmission and can hold moisture against seals. Use standard glass cleaner-nothing abrasive that scratches coatings.

Inspect flashing and caulking annually. Look for cracks in exterior caulk joints, lifted flashing, or any gaps where water could enter. Small issues caught early prevent major leaks. If you see daylight through a seal or notice water stains on the shaft interior, call for professional inspection immediately.

Check the operating mechanism on venting skylights. Manual cranks and chains need occasional lubrication. Motorized units should be tested a few times a year to ensure they open, close, and respond to controls properly. If a rain sensor isn’t closing the unit when it should, that’s a sign the sensor needs cleaning or replacement.

After major storms, especially if tree branches fell nearby, inspect the skylight glass for cracks or impacts. Even small cracks can expand with temperature changes and eventually lead to seal failures.

Replacing weatherstripping every 10-15 years keeps venting skylights sealing properly. Gaskets and seals compress and harden over time. Fresh weatherstripping prevents air leaks and ensures tight closure.

Most manufacturer warranties cover the skylight unit itself-glass seal failures, frame defects, hardware malfunctions-for 10-20 years. Our installation warranty at Dennis Roofing covers the flashing and roofing integration for five years, which means if a leak develops from our workmanship, we return to fix it at no charge. Always clarify what’s covered: the product warranty from the manufacturer and the installation warranty from your contractor.

Why Brooklyn Skylights Need a Roofing Approach

Brooklyn’s building stock-brownstones with flat or low-slope roofs, rowhouses with 100-year-old framing, converted lofts with industrial roof structures-demands a roofing-first approach to skylight replacement. These aren’t suburban houses with simple gable roofs and easy attic access. They’re complex structures where roof membranes, parapets, shared walls, and historic details all affect how a skylight should be installed.

The mistake I see repeatedly is treating skylight replacement like a window project. Windows mount into wall openings with house wrap and trim. Skylights penetrate roofs where water is actively trying to find its way in. That fundamental difference means you need someone who understands roof systems, water management, flashing, and how different roofing materials interact with skylight curbs.

At Dennis Roofing, we’ve replaced skylights across every Brooklyn neighborhood and building type. We know how to flash into torch-down membrane on a Williamsburg loft, how to work around the tight roof access of a Clinton Hill brownstone, and how to match historic details when replacing skylights on designated landmark buildings in Brooklyn Heights. We bring roofing knowledge to every skylight project, which means you get a complete installation that improves your home’s light, energy efficiency, and most importantly, stays watertight through every season.

If you’re dealing with a leaking, fogged, or outdated skylight, reach out to Dennis Roofing. We’ll inspect the entire assembly-glass, frame, curb, and flashing-give you a clear assessment of what needs replacement, and provide a detailed proposal that covers all the roofing and finishing work required for a proper installation. That’s how skylight replacement should be done, and that’s what you can expect when you work with us.