Skylights
Custom Skylights
VELUX Skylight Size Guide
VELUX offers a wide range of product sizes to suit different rooms, roof types, and design goals. This guide provides detailed dimensions across our product lineup, so you can plan with precision and choose the size that works best for your project.
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Solar Powered Fresh Air Skylight Systems (VSS)Deck MountedVSS Size Code
Outside Frame
(W" x H")Rough Opening / Finished Frame (W" x H")
C01
21 1⁄2" x 27 3⁄8"
21" x 26 7⁄8"
C04
21 1⁄2" x 38 3⁄8"
21" x 37 7⁄8
C06
21 1⁄2" x 46 1⁄4"
21" x 45 3⁄4"
C08
21 1⁄2" x 54 15⁄16"
21" x 54 7⁄16"
M02
30 9⁄16" x 30 1⁄2"
30 1⁄16" x 30"
M04
30 9⁄16" x 38 3⁄8"
30 1⁄16" x 37 7⁄8"
M06
30 9⁄16" x 46 1⁄4"
30 1⁄16" x 45 3⁄4"
M08
30 9⁄16" x 54 15⁄16"
30 1⁄16" x 54 7⁄16"
S01
44 3⁄4" x 27 3⁄8"
44 1⁄4" x 26 7⁄8"
S06
44 3⁄4" x 46 1⁄4"
44 1⁄4" x 45 3⁄4"
Solar-Powered Fresh Air Skylight System (VCS)Curb MountedVCS Size Code
Inside Curb
(W" x H")Outside Curb (W" x H")
Maximum skylight clearance (W" x H")
2222
22 1⁄2" x 22 1⁄2"
25 1⁄2" x 25 1⁄2"
26 5⁄8" x 26 5⁄8"
2234
22 1⁄2" x 34 1⁄2"
25 1⁄2" x 37 1⁄2"
26 5⁄8" x 38 5⁄8"
2246
22 1⁄2" x 46 1⁄2"
25 1⁄2" x 49 1⁄2"
26 5⁄8" x 50 5⁄8"
3030
30 1⁄2" x 30 1⁄2"
33 1⁄2" x 33 1⁄2"
34 5⁄8" x 34 5⁄8"
3046
30 1⁄2" x 46 1⁄2"
33 1⁄2" x 49 1⁄2"
34 5⁄8" x 50 5⁄8"
3434
34 1⁄2" x 34 1⁄2"
37 1⁄2" x 37 1⁄2"
38 5⁄8" x 38 5⁄8"
3737
37 1⁄2" x 37 1⁄2"
40 1⁄2" x 40 1⁄2"
41 5⁄8" x 41 5⁄8"
4622
46 1⁄2" x 22 1⁄2"
49 1⁄2" x 25 1⁄2"
50 5⁄8" x 26 5⁄8"
4630
46 1⁄2" x 30 1⁄2"
49 1⁄2" x 33 1⁄2"
50 5⁄8" x 34 5⁄8"
4646
46 1⁄2" x 46 1⁄2"
49 1⁄2" x 49 1⁄2"
50 5⁄8" x 50 5⁄8"
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Electric Fresh Air Skylight System (VSE) Deck MountedVSE Size Code
Rough Opening / Finished Frame, (W" x H")
Outside Frame (W" x H")
C01
21” x 26 7⁄8”
21 1⁄2" x 27 3⁄8"
C04
21" x 37 7⁄8
21 1⁄2" x 38 3⁄8"
C06
21" x 45 3⁄4"
21 1⁄2" x 46 1⁄4"
C08
21" x 54 7⁄16"
21 1⁄2" x 54 15⁄16"
M04
30 1⁄16" x 37 7⁄8"
30 9⁄16" x 38 3⁄8"
M06
30 1⁄16" x 45 3⁄4"
30 9⁄16" x 46 1⁄4"
M08
30 1⁄16" x 54 7⁄16"
30 9⁄16" x 54 15⁄16"
S01
44 1⁄4" x 26 7⁄8"
44 3⁄4" x 27 3⁄8"
S06
44 1⁄4" x 45 3⁄4"
44 3⁄4" x 46 1⁄4"
Electric Fresh Air Skylight System (VCE)Curb MountedVCE Size Code
Inside Curb
(W” x H”)Outside Curb (W” x H”)
Maximum skylight clearance (W" x H")
2222
22 1⁄2" x 22 1⁄2"
25 1⁄2" x 25 1⁄2"
26 5⁄8" x 26 5⁄8"
2234
22 1⁄2" x 34 1⁄2"
25 1⁄2" x 37 1⁄2"
26 5⁄8" x 38 5⁄8"
2246
22 1⁄2" x 46 1⁄2"
25 1⁄2" x 49 1⁄2"
26 5⁄8" x 50 5⁄8"
3030
30 1⁄2" x 30 1⁄2"
33 1⁄2" x 33 1⁄2"
34 5⁄8" x 34 5⁄8"
3046
30 1⁄2" x 46 1⁄2"
33 1⁄2" x 49 1⁄2"
34 5⁄8" x 50 5⁄8"
3434
34 1⁄2" x 34 1⁄2"
37 1⁄2" x 37 1⁄2"
38 5⁄8" x 38 5⁄8"
4646
46 1⁄2" x 46 1⁄2"
49 1⁄2" x 49 1⁄2"
50 5⁄8" x 50 5⁄8"
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Manual Fresh Air Skylight System (VS)Deck MountedVS Size Code
Rough Opening / Finished Frame (W" x H")
Outside Frame
(W" x H")C01
21" x 26 7⁄8"
21 1⁄2" x 27 3⁄8"
C04
21" x 37 7⁄8
21 1⁄2" x 38 3⁄8"
C06
21" x 45 3⁄4"
21 1⁄2" x 46 1⁄4"
C08
21" x 54 7⁄16"
21 1⁄2" x 54 15⁄16"
M02
30 1⁄16" x 30"
30 9⁄16" x 30 1⁄2"
M04
30 1⁄16" x 37 7⁄8"
30 9⁄16" x 38 3⁄8"
M06
30 1⁄16" x 45 3⁄4"
30 9⁄16" x 46 1⁄4"
M08
30 1⁄16" x 54 7⁄16"
30 9⁄16" x 54 15⁄16"
S01
44 1⁄4" x 26 7⁄8"
44 3⁄4" x 27 3⁄8"
S06
44 1⁄4" x 45 3⁄4"
44 3⁄4" x 46 1⁄4"
Manual Fresh Air Skylight System (VCM)Curb MountedVCM Size Code
Inside Curb
(W" x H")Outside Curb (W" x H")
Maximum skylight clearance (W" x H")
2222
22 1⁄2" x 22 1⁄2"
25 1⁄2" x 25 1⁄2"
26 5⁄8" x 26 5⁄8"
2234
22 1⁄2" x 34 1⁄2"
25 1⁄2" x 37 1⁄2"
26 5⁄8" x 38 5⁄8"
2246
22 1⁄2" x 46 1⁄2"
25 1⁄2" x 49 1⁄2"
26 5⁄8" x 50 5⁄8"
3030
30 1⁄2" x 30 1⁄2"
33 1⁄2" x 33 1⁄2"
34 5⁄8" x 34 5⁄8"
3046
30 1⁄2" x 46 1⁄2"
33 1⁄2" x 49 1⁄2"
34 5⁄8" x 50 5⁄8"
3434
34 1⁄2" x 34 1⁄2"
37 1⁄2" x 37 1⁄2"
38 5⁄8" x 38 5⁄8"
4646
46 1⁄2" x 46 1⁄2"
49 1⁄2" x 49 1⁄2"
50 5⁄8" x 50 5⁄8"
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Fixed Skylight System (FS)Deck MountedFS Size Code
Rough Opening / Finished Frame (W" x H")
Outside Frame
(W" x H")A06
14 1⁄2" x 45 3⁄4"
15 1⁄4" x 46 1⁄4"
C01
21" x 26 7⁄8"
21 1⁄2" x 27 3⁄8"
C04
21" x 37 7⁄8
21 1⁄2" x 38 3⁄8"
C06
21" x 45 3⁄4"
21 1⁄2" x 46 1⁄4"
C08
21" x 54 7⁄16"
21 1⁄2" x 54 15⁄16"
C12
21" x 70 1⁄4"
21 1⁄2" x 70 3⁄4"
D26
22 1⁄2" x 22 15⁄16"
23 1⁄4" x23 7⁄16"
D06
22 1⁄2" x 45 3⁄4"
23 1⁄4" x 46 1⁄4"
M02
30 1⁄16" x 30"
30 9⁄16" x 30 1⁄2"
M04
30 1⁄16" x 37 7⁄8"
30 9⁄16" x 38 3⁄8"
M06
30 1⁄16" x 45 3⁄4"
30 9⁄16" x 46 1⁄4"
M08
30 1⁄16" x 54 7⁄16"
30 9⁄16" x 54 15⁄16"
S01
44 1⁄4" x 26 7⁄8"
44 3⁄4" x 27 3⁄8"
S06
44 1⁄4" x 45 3⁄4"
44 3⁄4" x 46 1⁄4"
Fixed Skylight System (FCM)Curb MountedFCM Size Code
Inside Curb
(W" x H")Outside Curb (W" x H")
Maximum skylight clearance (W" x H")
2222
22 1⁄2" x 22 1⁄2"
25 1⁄2" x 25 1⁄2"
26 5⁄8" x 26 5⁄8"
2230
22 1⁄2" x 30 1⁄2"
25 1⁄2" x 33 1⁄2"
26 5⁄8" x 34 5⁄8"
2234
22 1⁄2" x 34 1⁄2"
25 1⁄2" x 37 1⁄2"
26 5⁄8" x 38 5⁄8"
2246
22 1⁄2" x 46 1⁄2"
25 1⁄2" x 49 1⁄2"
26 5⁄8" x 50 5⁄8"
2270
22 1⁄2" x 70 1⁄2"
25 1⁄2" x 73 1⁄2"
26 5⁄8" x 74 5⁄8"
3030
30 1⁄2" x 30 1⁄2"
33 1⁄2" x 33 1⁄2"
34 5⁄8" x 34 5⁄8"
3046
30 1⁄2" x 46 1⁄2"
33 1⁄2" x 49 1⁄2"
34 5⁄8" x 50 5⁄8"
3434
34 1⁄2" x 34 1⁄2"
37 1⁄2" x 37 1⁄2"
38 5⁄8" x 38 5⁄8"
3446
34 1⁄2" x 46 1⁄2"
37 1⁄2" x 49 1⁄2"
38 5⁄8" x 50 5⁄8"
4646
46 1⁄2" x 46 1⁄2"
49 1⁄2" x 49 1⁄2"
50 5⁄8" x 50 5⁄8"
FCM Size Code
Inside Curb
(W" x H")Outside Curb (W" x H")
Maximum skylight clearance (W" x H")
4672
46 1⁄2" x 72 1⁄2"
49 1⁄2" x 75 1⁄2"
50 5⁄8" x 76 5⁄8"
1943
19 1⁄2" x 43 1⁄2"
22 1⁄2" x 46 1⁄2"
23 5⁄8" x 47 5⁄8"
2347
23 1⁄2" x 47 1⁄2"
26 1⁄2" x 50 1⁄2"
27 5⁄8" x 51 5⁄8"
3171
32" x 72"
35" x 75"
36 1⁄8" x 76 1⁄8"
1430
14 1⁄2" x 30 1⁄2"
17 1⁄2" x 33 1⁄2"
18 5⁄8" x 34 5⁄8"
1446
14 1⁄2" x 46 1⁄2"
17 1⁄2" x 49 1⁄2"
18 5⁄8" x 50 5⁄8"
3055
30 1⁄2" x 55 1⁄2"
33 1⁄2" x 58 1⁄2"
34 5⁄8" x 59 5⁄8"
3422
34 1⁄2" x 22 1⁄2"
37 1⁄2" x 37 1⁄2"
38 5⁄8" x 38 5⁄8"
4622
46 1⁄2" x 22 1⁄2"
49 1⁄2" x 25 1⁄2"
50 5⁄8" x 26 5⁄8"
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Top Hinged Roof WindowGPU Size Code
Rough Opening / Finished Frame (W” x H”)
Outside Frame
(W” x H”)CK04
21 5⁄8" x 38 1⁄2"
22 1⁄8" x 39"
CK06
21 5⁄8" x 46 3⁄8"
22 1⁄8" x 46 7⁄8"
MK04
30 11/16" x 38 1/2"
31 1⁄4" x 39"
MK06
30 11/16" x 55 1/16"
31 1⁄4" x 46 7⁄8"
MK08
30 3⁄4" x 55 1⁄16"
31 1⁄4" x 55 1⁄2"
PK10
37 1⁄16" x 63"
37 5⁄8" x 63 1⁄2"
SK06
44 7⁄8" x 46 3⁄8"
45 3⁄8" x 46 7⁄8"
UK08
52 3⁄4" x 55 1⁄16"
53 1⁄4" x 55 1⁄2"
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Center Pivot Roof WindowGGU Size Code
Rough Opening / Finished Frame (W” x H”)
Outside Frame
(W” x H”)CK02
21 5⁄8" x 30 5⁄8"
22 1⁄8" x 31 1⁄8"
CK04
21 5⁄8" x 38 1⁄2"
22 1⁄8" x 39"
CK06
21 5⁄8" x 46 3⁄8"
22 1⁄8" x 46 7⁄8"
FK04
26" x 38 1⁄2"
26 1⁄2" x 39"
FK06
26" x 46 3⁄8"
26 1⁄2" x 46 7⁄8"
FK08
26" x 55 1/16"
26 1⁄2" x 55 1⁄2"
MK04
30 11/16" x 38 1/2"
31 1⁄4" x 39"
MK06
30 11⁄16" x 46 3⁄8"
31 1⁄4" x 46 7⁄8"
MK08
30 11⁄16" x 55 1⁄16"
31 1⁄4" x 55 1⁄2"
GGU Size Code
Rough Opening / Finished Frame (W” x H”)
Outside Frame
(W” x H”)MK10
30 11⁄16" x 63"
31 1⁄4" x 63 1⁄2"
PK06
37 1⁄16" x 46 3⁄8"
37 5⁄8" x 46 7⁄8"
PK08
37 1⁄16" x 55 1⁄16"
37 5⁄8" x 55 1⁄2"
PK10
37 1⁄16" x 63"
37 5⁄8" x 63 1⁄2"
SK06
44 7⁄8" x 46 3⁄8"
45 3⁄8" x 46 7⁄8"
SK08
44 7⁄8" x 55 1⁄16"
45 3⁄8" x 55 1⁄2"
UK04
52 3⁄4" x 38 1⁄2"
53 1⁄4" x 39"
UK08
52 3⁄4" x 55 1⁄16"
53 1⁄4" x 55 1⁄2"
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Roof Access WindowGXU Size Code
Rough Opening / Finished Frame (W” x H”)
Outside Frame
(W” x H”)CK06
22 1⁄8" x 46 7⁄8"
21 5⁄8" x 46 3⁄8"
FK06
26 1⁄2" x 46 7⁄8"
26" x 46 3⁄8"
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Roof BalconyGDL Size Code
Rough Opening / Finished Frame (W” x H”)
Outside Frame
(W” x H”)MK19
33 1⁄16" x 101"
30 3⁄4" x 99 1⁄4"
PK19
39 3⁄8" x 101"
37 1⁄16" x 99 1⁄4"
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Self Flashed Fixed Skylight SystemQPF Size Code
Outside Flashing (W" x H")
Rough Opening/Finished Frame (W" x H")
2222
29 5⁄8" x 29 5⁄8"
22 1⁄2" x 22 1⁄2"
2230
29 5⁄8" x 37 5⁄8"
22 1⁄2" x 30 1⁄2"
2246
29 5⁄8" x 53 5⁄8"
22 1⁄2" x 46 1⁄2"
3030
37 5⁄8" x 37 5⁄8"
30 1⁄2" x 30 1⁄2"
304
37 5⁄8" x 53 5⁄8"
30 1⁄2" x 46 1⁄2"
4646
53 5⁄8" x 53 5⁄8"
46 1⁄2" x 46 1⁄2"
