Skylight Installation Cost Estimator
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How it works
Skylights are priced by type and roof situation, not just size. A fixed unit in a new opening runs ~$900 installed; an electric vented one is ~$2,200. Replacing an existing skylight reuses the opening (20% cheaper); adding during a re-roof is cheapest of all.
The unit is only half the job — flashing is everything. Factory step-flashing kits integrated with shingles and ice-and-water shield are what keep it dry for 20 years. Caulk-only installs leak, guaranteed, usually in year 3–5.
Consider sun tunnels for hallways and baths: $700 installed, no structural framing, minimal leak risk, and surprisingly bright. They cannot ventilate, but for pure daylight they are the value pick.
Frequently asked questions
How much does a skylight cost installed?
Fixed: $800–1,200. Manual vented: $1,200–1,800. Electric with rain sensor: $2,000–2,800. Sun tunnel: $600–900. Prices are per unit including flashing and labor.
Do skylights always leak eventually?
No — that reputation comes from 1980s curb-mounted units sealed with caulk. Modern deck-mounted skylights with factory flashing kits last 20–30 years leak-free when installed correctly.
Fixed vs vented — which should I choose?
Fixed for light only (cheaper, zero leak points from openers). Vented for kitchens and baths where moisture and heat escape matters. Electric vented for out-of-reach placements.
Can I add a skylight to any roof?
Almost — but truss roofs need an engineer's okay to cut members, and placement must dodge rafters, wiring and plumbing vents. A pro site check ($0–100, often free with quote) settles it.
Will it make the room too hot?
South-facing skylights add real heat gain. Specify Low-E3 glass and consider blinds ($200–400). In hot climates, north-facing placement gives light without the sauna.
What is a sun tunnel?
A reflective tube (10–14" diameter) from roof to ceiling that floods small rooms with daylight. $600–900 installed, minimal structural work, tiny leak risk. No ventilation, no view — pure light.
How long does installation take?
Half to one day per skylight for straightforward installs; two days if framing, drywall and painting the light shaft are involved.
Do I need a permit?
Usually yes when cutting roof structure; often not for direct replacements. Your installer typically pulls it — confirm in the quote.
What about condensation?
Quality units have condensation channels and weep holes. Persistent interior dripping usually means humidity is too high or the unit lacks thermal breaks — not necessarily a roof leak.
When is the cheapest time to install?
During a re-roof: the flashing integrates with new shingles and labor overlaps, saving ~30%. Adding skylights to a 15-year-old roof means paying for flashing twice.