Skylights and Light Panels: Cost Comparison

If I want the short answer: light panels usually cost less upfront, while skylights often cost less over time in heated buildings.

Here’s the plain-English version:

Light panels (LTPs) are usually the lower-cost pick for unheated barns, sheds, and storage buildings
Skylights cost more to buy and install, but they often last 25 to 30 years, versus 12 to 18 years for many light panels
In heated buildings, skylights can offer R-3.5 to R-5.0, while many single-skin light panels sit around R-1.5 to R-2.0
Retrofit work can cost 35% to 45% more than adding daylighting during new construction
A framing cut-in can add about $555 CAD per opening, plus $150 to $425 CAD for permits in some areas
In Canada, snow, ice, condensation, and freeze-thaw cycles can change the long-term cost in a big way

So if you’re comparing these two options for a steel building, I’d look at five things first:

Upfront cost
Installation work
Heat loss
Leak and moisture risk
Service life

Skylights vs. Light Panels: Cost & Performance Comparison for Canadian Steel Buildings

Quick Comparison

Option	Upfront cost	Best use	Insulation	Service life	Main watch-out
Skylights	Higher	Heated workshops, barndominiums, finished spaces	R-3.5 to R-5.0	25–30 years	More roof work and higher install cost
Light panels (LTPs)	Lower	Unheated farm buildings, storage, warehouses	R-1.5 to R-2.0	12–18 years	More weather wear, lower thermal performance

Bottom line: if your building is heated, a skylight can make more sense despite the higher price. If it’s unheated, a light panel is often the lower-cost route.

I’ve broken the rest of the article around the costs that matter most: install labour, framing, roof detailing, energy use, and long-term upkeep.

Cost factors that apply to both options

Materials, roof detailing, and structural changes

If you’re comparing a skylight with a light panel, the sticker price of the unit doesn’t tell the whole story. A lot of the installed cost comes from the parts around it: flashing, sealants, fasteners, curbs, and any framing changes needed to fit the opening.

For a standard fixed skylight, you also need a matched flashing kit. That matters for weather protection and for keeping the warranty in place. Light panels work a bit differently. They need sealant at every seam and stitch screws along the ribs, while skylights rely on manufacturer-matched flashing to keep water out.

Low-slope roofs under 14° need a raised curb. In Canada, curbs should sit 100 to 200 mm above the roof plane so snow and meltwater can drain off properly. Skip that step, and leaks become much more likely for either option.

Opening size also affects cost. Smaller openings under 355 mm (14 inches) wide in a steel roof usually don’t need extra framing. Once you move up to 560 mm (22 inches) or more, which is common with larger skylights, an angle-iron frame is usually welded in to transfer loads to nearby ribs or rafters. That adds both material and labour.

Put simply: the larger the opening, the more the total cost tends to climb.

Installation, air sealing, and maintenance

Installation method changes the math fast. New construction costs 35% to 45% less than retrofit work for either system. That’s because retrofits are messier. Crews have to cut into finished steel, adjust framing, and sometimes remove insulation to make the opening work.

A framing cut-in costs about $555 CAD per opening. On top of that, permits can add $150 to $425 CAD, depending on the municipality.

In heated buildings, air sealing and vapour control add labour, but they can help avoid condensation damage later. That’s a big deal in Canadian winters. Light panels have their own issue here: their insulation value is low, about R-1.5 to R-2.0, so on cold mornings it’s common to see moisture form on the interior face.

Maintenance is another shared cost. Both systems need regular cleaning if you want to keep light levels up. Roof-mounted panels, in particular, can lose performance fast when dirt, pollution, leaves, or snow build up on the surface.

Energy impact by building type

Energy cost depends less on the product name and more on how the building is used.

In an unheated storage building or farm structure, the savings usually come from cutting daytime electric lighting use. In that kind of space, a lower-cost light panel can be the better fit.

Heated buildings are a different story. In colder climate zones, buyers often move toward higher-spec glazing to limit heat loss and condensation. That pushes the upfront price higher and can eat into the energy savings you were hoping to get.

Those shared costs make the side-by-side price comparison a lot clearer.

Skylights vs. light panels: cost breakdown by system

Skylights: higher unit cost and more roof work

Skylights cost more mainly because each one needs its own roof opening and flashing. That means more labour, more detailing, and more chances for the installer to spend time framing and finishing the area. Fixed units, domed polycarbonate units, and tubular daylighting devices all sit at different price points, but they share the same issue: more roof work than a light panel.

A small polycarbonate dome costs about $450 CAD installed. A sun tunnel usually lands between $595 and $1,180 CAD installed. Move up to a medium fixed unit at 560 mm × 1,170 mm (22 in × 46 in), and the installed cost is about $1,560 to $3,025 CAD. Vented skylights cost more again, ranging from $2,025 to $4,860 CAD installed. Those numbers usually include the unit itself, flashing, framing, and interior finishing in insulated buildings.

Light panels: lower material cost per area and simpler integration

Light transmitting panels usually cost less to install because they skip most of that extra roof work. Instead of cutting a separate opening, they take the place of standard roof or wall panels. That simpler setup cuts labour and trims accessory costs too.

LTPs are usually made from FRP (fibreglass-reinforced plastic) or polycarbonate, and they’re built to match common steel cladding profiles such as PBR panels. Since a standard-width panel does not need a curb, a flashing kit, or a structural header, the installed cost per square metre is lower. Put simply, you’re swapping cladding panels, not building a new roof opening. That makes LTPs a practical choice for new construction, when the panels can go into the cladding run before the building is closed in.

Service life, leak risk, and weather exposure

The price gap doesn’t end with installation. Service life, weathering, and leak risk all shape the long-term cost.

Feature	Skylights	Light panels (LTPs)
Lifespan	25–30 years	12–18 years
Thermal performance	R-3.5 to R-5.0 (triple-glazed options)	R-1.5 to R-2.0 (single-skin)
Leak risk	Low when curb-mounted and properly flashed	Moderate; relies on mastic at panel overlaps
UV/weathering	Minimal with quality glazing	Yellowing and surface bloom are common in FRP

FRP can yellow and lose clarity over time. When that happens, less daylight gets through, and electric lighting use can creep up. UV-stable polycarbonate with co-extruded cap layers helps slow that wear, but it does not stop it completely.

In Canadian climates with heavy snow loads, curb-mounted skylights have a clear edge. The raised curb helps keep snow and meltwater from sitting against the frame. Flush-mounted skylights are more exposed to ice buildup on low-slope roofs. LTPs on low-slope roofs run into a similar issue because the panel overlaps depend on mastic to stay watertight. So while light panels can save money at the start, shorter service life and faster weather wear can eat into those savings.

Direct cost comparison for common Canadian use cases

Unheated storage and agricultural buildings

For barns, equipment sheds, and utility storage, light transmitting panels (LTPs) usually give you more for your money. These buildings don’t need much in the way of thermal control. What they need is enough daylight to move around safely and get work done without turning on lights all day. In most cases, LTPs are the lowest-cost daylighting choice because they replace standard steel panels during installation.

For agricultural buildings, wall-mounted LTPs placed high on east- or west-facing walls are often a smart pick. They’re easier to clean with an extension pole, which means less climbing and fewer maintenance risks. They’re also less likely to get damaged during routine upkeep. On sites that deal with heavy snow, that can make day-to-day maintenance a lot simpler.

Once heat retention starts to matter, though, that advantage starts to disappear.

Heated workshops, commercial spaces, and barndominiums

In heated buildings, the math changes. A polycarbonate dome or LTP only provides about R-1.5 to R-2.0 insulation. In a heated workshop or barndominium kept at 21°C when it’s −25°C outside, that’s a big weak spot. It can lead to condensation and steady heat loss. In this kind of setup, a triple-glazed, argon-filled Low-E skylight with a thermal break is the practical starting point and lines up with NBC 9.36 expectations for climate zones 6 to 8.

The upfront price is higher. A medium fixed skylight costs about $1,560 to $3,025 CAD installed. Still, in a heated space, the stronger thermal performance can make that added cost much easier to justify.

Planning choices for steel kits

Another big cost factor is when you plan the opening. If daylighting is built into the project before fabrication, costs stay much lower. Retrofitting is usually more expensive, and openings wider than 560 mm (22 in.) often need welded angle-iron reinforcement. Most self-flashing skylight units also need at least a 3:12 roof pitch. If the roof is flatter than that, you’ll usually need a curb mount, which adds to the total cost.

Canadian Buildings offers customisable steel building kits made in Canada, with layout and accessory options that can include daylighting.

Conclusion: Which option costs less over the long run

After looking at unit cost, installation, and maintenance, the long-run answer is pretty simple: the lower-cost option depends on how the building is used.

LTPs cost less at the start. Skylights, on the other hand, usually last longer. In a heated workshop or barndominium, that longer lifespan and better insulation can make the higher price worth it.

That matters even more in cold Canadian climates. Basic LTPs can become weak spots in heated buildings, while higher-spec skylights help cut heat loss and condensation. In an unheated barn, that trade-off doesn’t carry the same weight.

FAQs

Which option is better for a heated steel building?

It comes down to what matters most to you.

For heated steel buildings, premium curb-mounted skylights with double-glazed glass or multiwall polycarbonate are usually the better pick if your main goals are insulation, lower heat loss, and condensation control.

Translucent light panels are often the lower-cost option for bringing daylight into large spaces. The trade-off is that they don’t insulate as well, and their performance can drop over time.

Placement matters too. So does proper flashing. Both can help you hang on to better energy efficiency.

Are skylights worth the higher upfront cost?

It comes down to what you want the steel building to do.

If your goal is to cut power use and make the space feel better to work in, skylights can be a smart pick. They can reduce lighting energy use by up to 80%, improve the look of the building, and make big interior spaces feel brighter and more productive.

The catch is the upfront cost. Skylights usually cost more than basic light-transmitting panels because the install is harder. There’s more framing, more finishing, and more labour involved.

So the choice is pretty simple: lower long-term lighting costs and a better work area on one side, or a lower upfront spend on the other.

When is it cheaper to install daylighting?

Daylighting usually makes the most financial sense during new construction. In most cases, it’s 35% to 45% cheaper than retrofitting an existing building, mainly because you can avoid cutting rafters, adding new framing, and paying for extra drywall finishing.

For smaller or enclosed spaces, tubular daylighting systems often cost less than full skylights. They tend to go in faster, need smaller roof openings, and usually come with lower labour costs.