Skylights are one of the few home improvements that genuinely change how a room feels for a relatively modest spend. They're also one of the easiest things to get quoted badly, because the unit price and the installed price are very different numbers. Here's how the costs break down.
Indicative ranges only. Skylight pricing depends on the unit chosen, your roof type, the ceiling height and whether any framing has to move. Use these as a budgeting guide, not a quote.
Why the price range is so wide
A hardware store shelf price of $600 for a skylight unit has almost nothing to do with what appears on your invoice. The unit is often less than half the job. The rest is cutting and flashing the roof, building or lining the shaft down to the ceiling, making good the interior, and getting safe access to the roof in the first place.
Get the flashing wrong and you own a permanent leak. That's why skylight installation is roofing work, not glazing work.
Cost by skylight type
| Type | Best for | Indicative installed cost |
|---|---|---|
| Sun tunnel | Hallways, bathrooms, small rooms | $1,500 – $2,800 |
| Fixed skylight | Light only, no ventilation | $1,800 – $3,500 |
| Manual opening / vented | Bathrooms, kitchens | $2,800 – $5,000 |
| Electric or solar opening | High or hard-to-reach ceilings | $4,000 – $7,000 |
Sun tunnels are the value option. A reflective tube carries daylight from a small roof dome down into a windowless space, and because the roof opening is small the flashing and framing work is minimal. For a dark hallway they're hard to beat.
Fixed units are the standard choice where you want light and nothing else. Simple, reliable, no moving parts to fail.
Opening units cost more but earn it in bathrooms and kitchens, where getting moisture out matters as much as getting light in. In a windowless ensuite, a vented skylight does two jobs at once.
Electric and solar units add convenience and a rain sensor that closes the unit for you. Worth it over a stairwell or a three-metre ceiling where a manual pole is a daily annoyance.
Cost by installation scenario
Type matters, but what really moves the total is how much work your roof and ceiling need.
Single skylight into an existing roof — half a day to a day
Standard installation with no structural change: cut the opening between existing rafters, fit the unit and flashing kit, line and finish the shaft. This is the scenario the table above assumes.
Multiple skylights or a sun tunnel run — one to two days
Fitting two or three units in one visit is meaningfully cheaper per unit than doing them separately, because access and setup are shared. If you're considering skylights in two rooms, do them together.
Structural work or roof reframing — two to four days
If the opening you want is wider than the rafter spacing, part of the roof structure has to be reframed. Add $1,500 – $4,000 depending on scope. Large picture-style openings in a cathedral ceiling sit firmly in this category.
What should be included in the price
- The unit — and its manufacturer's flashing kit, matched to your roof profile. Generic flashing on a branded skylight is where warranties die.
- Cutting and weatherproofing the roof opening.
- The internal shaft — framing and lining from roof down to ceiling. On a flat ceiling with a big roof space, this shaft can be over a metre long and is a real part of the labour.
- Interior finishing — stopping and preparing the shaft. Confirm whether painting is included; often it isn't.
- Access — ladders, edge protection or scaffolding as needed.
- Rubbish removal and a clean site.
Your roof type changes things
On long-run steel, installation is relatively straightforward — the flashing kit is designed for the profile and the sheets are easy to work with. On concrete or clay tile, tiles must be lifted and cut around a purpose-made flashing, which takes longer and needs more care. On membrane or flat roofs, the unit needs an upstand curb built so water can never pond against the frame. Flat-roof skylights are the most demanding and the most expensive to do properly.
Where skylights earn their keep
The rooms that benefit most are the ones nobody thinks about:
- Hallways and windowless corridors — the single biggest visual transformation per dollar.
- Bathrooms and ensuites — light plus ventilation, and less mould.
- Kitchens — daylight over a bench without giving up wall space.
- Stairwells — light travels down through the level below.
- Attic and loft conversions — often the difference between storage and a usable room.
In practice the split is fairly predictable. We fit a lot of sun tunnels into the dark central hallways of older homes around Kensington, Mairtown and Regent, where the original floor plans were drawn up long before anyone worried about natural light. In the newer builds out at Kamo and Whau Valley, it's more often opening units over kitchens and bathrooms, specified while the house is still being planned.
Running costs and the long view
A well-installed skylight costs nothing to run and reduces daytime lighting use. Modern double-glazed units include UV protection and thermal glazing, so the old complaint about skylights baking a room in summer is largely a problem of older single-glazed units.
Budget for eventual maintenance though. Seals and flashings are the parts that age, particularly in Northland's rainfall and UV. Most skylight repairs are seal or flashing work rather than glazing failure, and dealing with them early is far cheaper than replacing a ceiling. If an existing skylight has fogged between its panes or is staining the ceiling around the frame, that's a repair conversation, not necessarily a replacement one.
Do you need consent?
Adding a skylight to an existing roof usually doesn't require building consent, provided no structural alteration is involved. Cut through rafters or reframe part of the roof, and consent generally is required. Our roofing permits and building consent guide sets out where the line falls, and we'll flag it during quoting either way.
Two ways to save real money
First, combine the work. If you're already having a reroof or major roof work done, adding skylights while the roof is open and access is paid for is dramatically cheaper than a standalone visit later.
Second, be honest about what the room needs. A $6,000 electric opening unit in a hallway that only needed a $2,000 sun tunnel is the most common overspend we see. More glass is not automatically better.