A skylight can transform a dark NZ hallway or bathroom into a bright, usable space. Here's what skylight installation costs in NZ in 2026, which type of skylight suits different situations, and what the consent rules are.
Skylight Installation Cost NZ 2026
| Skylight type | Typical installed cost |
|---|---|
| Fixed flat skylight (600×600mm) | $800–$2,000 |
| Fixed pitched skylight (Velux FS, 780×980mm) | $1,500–$3,000 |
| Venting skylight (manual, 780×980mm) | $2,000–$4,000 |
| Venting skylight (electric / solar, 780×980mm) | $2,500–$5,500 |
| Tubular skylight (250mm diameter) | $1,200–$2,500 |
| Tubular skylight (350mm diameter) | $1,800–$3,500 |
| Sun tunnel / light tube (flexible, short run) | $800–$1,800 |
| Roof lantern / ridge light | $5,000–$20,000+ |
All prices include supply and installation. GST inclusive. Auckland 15–20% above. Prices include basic flashing kit — complex roofs (slate, clay tile, long spans) add cost.
Skylight Types
Fixed Skylights
A sealed glazed panel in the roof — lets light in, does not open for ventilation.
Best for: Living areas, hallways, bedrooms — anywhere you want extra light but ventilation isn't the primary goal.
Glazing: Most NZ skylights use double-glazed safety glass or polycarbonate. Look for low-E (low-emissivity) coatings to reduce heat gain in summer and heat loss in winter — particularly valuable in the NZ climate.
Shape options: Rectangular (most common), square, domed, or custom shapes. Flat skylights suit flat or low-pitch roofs; pitched frame skylights are designed for standard roof pitches.
Venting Skylights
Opens for ventilation — manually (crank handle or pole) or electrically (motor-driven, rain sensor option).
Best for: Bathrooms, kitchens, and rooms where ventilation matters as much as light. A venting skylight can often replace a bathroom extraction fan.
Rain sensor: Electric venting skylights with rain sensors close automatically when it rains — worth the extra cost in NZ's changeable weather.
Solar-powered: Some venting skylights run the motor off a small solar panel — no electrical wiring required, which reduces installation cost.
Tubular Skylights (Sun Tunnels)
A small dome on the roof connected via a reflective aluminium tube to a diffuser in the ceiling. The tube can be bent around obstacles — perfect for introducing light to rooms that don't sit directly under the roof (hallways, bathrooms, laundries, under stairs).
Velux Sun Tunnel and the Solatube brand are the main NZ products.
Advantages: Minimally invasive installation (small roof opening), works through insulated ceilings without major disruption, can reach rooms up to 3–5m from the roof.
Limitations: Provides diffused light, not a view. Less light than a full-sized skylight. Doesn't provide ventilation.
Roof Lanterns and Ridge Lights
Large structural glazed units sitting on top of a flat roof or at the ridge of a pitched roof — much larger than standard skylights, often a centrepiece of the architecture. Very high cost and always require engineering/consent.
Does a Skylight Need Building Consent in NZ?
Generally exempt (no consent): - A skylight that is a like-for-like replacement of an existing skylight in the same opening - Some small skylights in existing homes — check with your council
Consent likely required: - Any new roof opening that doesn't already exist - Structural changes to roof framing (cutting between rafters or trusses) - Roof lanterns or ridge lights (structural glazing elements)
The key issue is roof structure. When a rafter or truss member is cut to install a skylight, structural work (trimmer rafters, headers) must be done to redistribute the load. This is structural work requiring a building consent and potentially an engineer's input.
A good skylight installer will advise on consent before starting — an unconsented structural roof modification is a defect that will need to be remedied on sale.
Installation Process
- Structural assessment: Installer checks roof structure — rafter/truss spacing and depth, existing insulation
- Roof opening: Roofing removed, hole cut in roof cladding and framing modified as needed
- Framing: Trimmer rafters or header installed around the opening
- Skylight fixed: Unit installed, flashing kit sealed (this is the critical weathertightness step)
- Interior finish: Ceiling cut, light shaft or tunnel installed, diffuser or reveal finished
- Electrical: For electric venting units, electrician wires the motor
Flashing is critical. Poor flashing is the most common cause of skylight leaks — ensure your installer uses the manufacturer's flashing kit for the specific roof cladding type (iron, long-run, concrete tile, clay tile each have different flashing requirements).
Velux vs Other Brands
Velux is the market-leading skylight brand globally and has a strong presence in NZ — wide range of sizes, good local support, and the most comprehensive flashing kits for NZ roof types. Tend to be at the premium end of the price range.
Alternatives in NZ: Fakro, Keylite, and NZ-local brands — generally lower cost, with narrower flashing kit ranges. Fine for standard Colourbond or long-run iron roofs; Velux has better support for tile roofs.
Buy the right flashing kit: When quoting, confirm the installer will use the correct flashing kit for your roof type. Using the wrong flashing or generic flashing is the primary cause of skylight leaks.
Energy Efficiency
A poorly specified skylight can add significant heat loss in winter (skylights are a big source of heat loss — glass has much lower R-value than insulated roof).
Look for: - Double glazing minimum (triple glazing premium for cold South Island locations) - Low-E (low-emissivity) coating — reduces winter heat loss and summer heat gain - Good thermal break in the frame
Position matters: A north-facing skylight captures maximum winter sun (good in NZ). A south-facing skylight provides even, cool light but minimal solar gain. East/west skylights capture strong morning/afternoon sun — can cause overheating in summer.
Find skylight installers near you: Roofers NZ | Builders NZ | Post Your Job Free
Frequently Asked Questions
How much does skylight installation cost in NZ? A fixed pitched skylight (780×980mm, Velux or equivalent): $1,500–$3,000 installed including flashing kit. A tubular skylight (250mm): $1,200–$2,500. An electric venting skylight with rain sensor: $2,500–$5,500. Prices depend heavily on roof type and complexity of the interior ceiling/shaft.
Do skylights need building consent in NZ? Like-for-like replacement of an existing skylight: usually no consent needed. Any new roof opening or work that cuts roof framing: building consent is typically required. Always check with your local council before cutting any new holes in your roof.
How do you stop a skylight from leaking in NZ? The flashing installation is the critical factor. Use the manufacturer's specific flashing kit for your roof type — not generic flashing or DIY silicone. Have a roofer (not just a builder) install the unit if you have a tile or unusual roof. After installation, check the flashing detail hasn't lifted in the first winter.
What is the best skylight for a NZ bathroom? A venting skylight — either manual or electric. Ventilation prevents moisture build-up in bathrooms and can replace or supplement an extraction fan. Electric models with rain sensors close automatically when it rains. Tubular skylights work well for light in rooms where a standard skylight would be too invasive.
How much light does a skylight add compared to a window? A skylight lets in approximately 3× more light per unit area than a vertical window, because it captures light from a larger portion of the sky throughout the day. This makes skylights particularly effective in rooms where windows are small or blocked by neighbouring structures.
Related: Roof Replacement Cost NZ | Roofers NZ | Post a Job Free