Enter your Velux code, upload a photo of the data badge, or give us your outside frame measurements we’ll tell you whether it’s a standard NZ size or a special order, and email you the result before anything is ordered.
| Outside frame size | Old codes / possible entries | Current replacement code |
|---|---|---|
| 55 x 78 cm | GGL102, C02, CO2, CK02, CKO2 | CK02 |
| 55 x 98 cm | GGL104, 6, C04, CO4, CK04, CKO4 | CK04 |
| 78 x 98 cm | GGL304, 1, M04, MO4, MK04, MKO4 | MK04 |
| 66 x 118 cm | GGL206, 5, F06, FO6, FK06, FKO6 | FK06 |
| 78 x 118 cm | GGL306, 14, M06, MO6, MK06, MKO6 | MK06 |
| 78 x 140 cm | GGL308, 2, M08, MO8, MK08, MKO8 | MK08 |
| 138 x 98 cm | GGL804, 7, U04, UO4, UK04, UKO4 | UK04 |
| 114 x 118 cm | GGL606, 4, S06, SO6, SK06, SKO6 | SK06 |
| 98 x 160 cm | GGL410, 3, P10, PK10 | PK10 |
| 134 x 140 cm | GGL808, 8, U08, UO8, UK08, UKO8 | UK08 |
There are three easy ways to identify your skylight, no ladder-climbing expertise required.
Every Velux roof window has a small metal or plastic data badge on the inside frame, usually found on the top-right edge when the window is opened. It shows a size code such as MK06, CK02 or PK10 — enter this directly into the finder above.
Every Velux roof window has a small metal or plastic data badge on the inside frame, usually found on the top-right edge when the window is opened. It shows a size code such as MK06, CK02 or PK10 — enter this directly into the finder above.
Not confident reading the badge? Upload up to five clear photos of it through the finder tool and our team will confirm the size and code for you at no cost.
Reading a current badge: the top line (e.g. MK06) is the current Velux size code, the second block (GGL, GPL, GGU, GPU) is the roof window type, and any red numbers are the older-generation code for that same size — handy if you’re ordering blinds or flashing made for an older window.
Skylight Experts stocks the full current Velux range across every roof and window type sold in New Zealand. If your size and code appear in the charts below, you’re looking at a standard, off-the-shelf skylight with the shortest lead time.
Our most popular category, covering centre-pivot and top-hung roof windows from compact 550 × 780mm units up to large 1340 × 1800mm windows, in codes from CK01 through to UK12.
Fixed, manual and electric flat roof windows for low-pitch and flat roofs, ranging from 600 × 600mm domestic units up to 2000 × 1500mm commercial sizes.
Vertical glazing panels that pair with roof windows to extend the view and light down a wall, available in four widths (780mm–1340mm) and four heights (601mm–1375mm), codes MK31 through UK38.
For character homes and architecturally distinctive roofs: Heritage Conservation roof windows (CC04–SC10) built to match traditional profiles, Cabrio-style Roof Balcony windows (MK19/PK19/SK19), Roof Terrace windows (M08/M35), and Duo/Triple Dormer window sets for combining multiple roof windows into one feature.
Including FFKF06/FFKF08 3-in-1 combination roof windows, GVK/GVT cold room roof windows for insulated spaces, and Velux Sun Tunnels in both 250mm and 350mm diameters for flat and pitched roofs — a cost-effective way to bring daylight into hallways, bathrooms and small rooms without a full skylight.
Velux has updated its size-coding system over the years, so an older roof window won’t always show the current code. If you’re replacing an existing skylight, use the table below to match your old code (or outside frame measurement) to today’s equivalent.
| Outside Frame (W × H) | Old Code(s) You May See | Current Code |
|---|---|---|
| 55 × 78 cm | GGL 102, C02, CO2, CKO2 | CK02 |
| 55 × 98 cm | GGL 104, 6, CO4, CKO4 | CK04 |
| 78 × 98 cm | GGL 304, 1, MO4, MKO4 | MK04 |
| 66 × 118 cm | GGL 206, 5, FO6, FKO6 | FK06 |
| 78 × 118 cm | GGL 306, 14, MO6, MKO6 | MK06 |
| 78 × 140 cm | GGL 308, 2, MO8, MKO8 | MK08 |
| 138 × 98 cm | GGL 804, 7, UO4, UKO4 | UK04 |
| 114 × 118 cm | GGL 606, 4, SO6, SKO6 | SK06 |
| 98 × 160 cm | GGL 410, 3, PIO, PK10 | PK10 |
| 134 × 140 cm | GGL 808, 8, UO8, UKO8 | UK08 |
“Standard” means your skylight’s size and code match one of Velux’s catalogue sizes shown above — these are held as regular stock items and generally have the shortest lead times. A “special order” applies when:
Matches a catalogue code above. Held as regular stock, shortest lead time.
- Your existing opening doesn’t match a standard external frame size (common in older or architecturally custom roofs)
- You need a heritage/conservation profile for a listed or character property
- You’re combining windows (Duo/Triple dormers, 3-in-1 units) in a configuration not shown above
- You require a non-standard glazing, finish, or electric/solar accessory combination
Special order skylights typically take longer to arrive than stock sizes, so it pays to confirm your size early. Use the finder tool above, or contact our LBP-certified team for a free assessment before you commit to a size.
What size are Velux skylights?
Velux skylights range from compact 550 × 780mm roof windows up to large 1340 × 1800mm units, plus flat roof windows up to 2000 × 1500mm and sun tunnels in 250mm or 350mm diameters. The exact size available depends on the window type — see the size charts above for the full NZ range.
How do I find the size of my existing skylight?
Look for the data badge on the inside frame (usually top-right when the window is open) for a code like MK06 or CK04. No badge? Measure the outside frame width and height, or upload a photo through our size finder tool and we’ll confirm it for you.
Where is the Velux size code located on the window?
On roof windows made after the late 1960s, the code is on a small metal or plastic badge fixed to the top-right edge of the frame, visible once the window is opened.
Where is the Velux size code located on the window?
On roof windows made after the late 1960s, the code is on a small metal or plastic badge fixed to the top-right edge of the frame, visible once the window is opened.
Can I replace an old Velux skylight with a new one of a different code?
Yes. Velux has changed its coding system over time, so an old code (e.g. 304 or GGL-1) usually maps to a current equivalent (e.g. MK04) — see our old-vs-new code table above. In most cases the replacement fits the same roof opening.