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VELUX solar-opening flat-roof skylight · VCS 4646
Solar operation explained
Required for installation
Build the complete VCS 4646 package
✔ VELUX Supply & Install ✔ Custom Flashing ✔ Noble Park Pickup & Melbourne Delivery ✔ 2026 Cost Guide ✔ Custom Flashing Guide
VELUX VCS 4646 Solar Opening Skylight 1275 × 1275mm
Original price was: $3,308.70.$2,746.22Current price is: $2,746.22.
The VELUX VCS 4646 is the largest solar-opening skylight in the current VELUX flat-roof VCS family, measuring 1275 × 1275mm with approximately 1104 × 1104mm of internal glass, 1.22m² daylight area and 1.65m² ventilation area. It combines solar-powered opening, wireless control, automatic rain closing and a removable insect screen, and weighs approximately 57.2kg excluding flashing. Ideal for large living rooms, open-plan kitchens, dining areas, major extensions, large studios; matching custom flashing is available for tile, Corrugated, TrimDeck and Klip-Lok roofs.
VELUX VCS 4646 Solar Opening Skylight – 1275 × 1275mm
The VELUX VCS 4646 is the largest solar-opening skylight in the current VELUX flat-roof VCS family. It provides approximately 1104 × 1104mm of internal glass, 1.22m² daylight area and 1.65m² ventilation area, combining natural light with convenient solar-powered fresh-air control.
1275 × 1275mm throat1104 × 1104mm glass1.22m² daylight1.65m² ventilation57.2kgSolar openingRain sensor0°–60° roof pitchCustom flashing required
57.2kg Excluding FlashingPlan delivery, lifting and roof access before installation.
Solar-Powered OpeningExternal solar panel recharges a concealed battery that powers the skylight motor.
Automatic Rain ClosingThe integrated rain sensor closes the unit when rain is detected.
Supply or InstallationSupply-only, Noble Park pickup, Melbourne delivery or professional installation for suitable projects.
Why this exact size?
Why Choose VCS 4646?
Maximum vcs daylight and ventilation for large architectural spaces.
Rooms It Can Suit
- Large Living Rooms
- Open-Plan Kitchens
- Dining Areas
- Major Extensions
- Large Studios
- Premium Feature Spaces
Why Choose Solar Opening?
- Wireless wall control
- Automatic rain sensor
- Removable insect screen
- No mains wiring required for the skylight motor
- Optional smart-home upgrade path
Orientation: VELUX VCS skylights must be installed in the orientation shown for the model and should not be rotated to create another format.
Daylight + Ventilation + Remote Convenience
Solar PanelRecharges the concealed battery pack.
Wireless ControlOpen and close the skylight without reaching the roof opening.
Rain SensorAutomatically closes the skylight when rain is detected.
Smart UpgradeCompatible VELUX control products can add app/sensor functions.
Precise wording: the VCS skylight motor does not require mains wiring. Other electrical or smart-home work on the project is separate.
VCS 4646 Requires Custom Flashing
VELUX does not provide a standard flashing kit with VCS. The unit needs a properly prepared kerb/upstand and roof-specific custom flashing. Central Skylights supplies matching flashing for tile, Corrugated, TrimDeck and Klip-Lok roofs.
MATCHING CUSTOM FLASHING
Custom Flashing for VCS 4646
- Concrete and terracotta tile
- Corrugated metal
- TrimDeck
- Klip-Lok
- Prefabricated or Flat Pack
- Colorbond colour and backflash options
KERB / UPSTAND
Flat Roof Does Not Mean “Sit It Flat”
VCS is rated for 0°–60°, but VELUX recommends a slight 3°–5° pitch where practical to reduce condensation build-up and water ponding on the glass.
Kerb height, water direction, roof profile, flashing and backflash should be planned as one system.
Installation planning
VCS 4646 Weight & Handling
The VCS 4646 weighs approximately 57.2kg excluding flashing. Product weight becomes increasingly important for lifting, roof access and safe handling as the VCS size increases.
Roof Access
Check ladders, scaffolding, side access and the path from delivery point to roof.
Safe Lifting
Plan the lift around both size and weight rather than dimensions alone.
Flashing Is Extra
The listed weight excludes custom flashing, timber kerb/upstand and other installation materials.
Real Central Skylights work
Flat-Roof Skylight & Custom-Flashing Examples
These genuine Central Skylights photographs illustrate low-pitch roof integration, flashing and drainage. The exact models shown may differ from VCS 4646.
Low-Pitch Custom FlashingReal St Kilda project showing a VELUX flat-roof skylight integrated into a low-pitch corrugated roof with custom Colorbond flashing.
Roof IntegrationRoof profile, skylight base, kerb and flashing need to work together rather than being treated as separate items.
Flashing & DrainageA correct roof detail has to manage water above, around and below the skylight without trapping flow.
Project images are genuine Central Skylights work. Exact VELUX model, size and flashing detail vary by project.
Opening skylight + raised flashing project →Bentleigh East VCM opening-skylight project showing a raised custom Colorbond flashing and backflash on a low-pitch corrugated roof.Flat-roof flashing project →St Kilda VELUX low-pitch project showing why correct custom flashing and water management matter.
Not sure whether VCS 4646 is right for your roof?
Send roof, ceiling and room photos. We can help compare size, roof profile, kerb/upstand, flashing and fixed vs manual vs solar opening.
About VELUX VCS 4646
VCS 4646 is designed for flat and low-pitch roofs where both daylight and controllable fresh-air ventilation matter. Maximum vcs daylight and ventilation for large architectural spaces.
Choose VCS When
- The room traps heat, steam or stale air
- The skylight is out of easy reach
- You want automatic rain closing
- You want solar operation rather than manual control
- You may want smart control later
Consider Another Product When
- You only need daylight — compare FCM where available
- Manual opening is enough — compare VCM where available
- A smaller or larger VCS better fits the room
- The roof opening / structure does not suit this size
VCS 4646 Size, Daylight & Ventilation
| Model | VCS 4646 |
|---|---|
| Throat size | 1275 × 1275mm |
| Internal glass | Approx. 1104 × 1104mm |
| Daylight area | 1.22m² |
| Ventilation area | 1.65m² |
| Weight | 57.2kg excluding flashing |
| Operation | Solar-powered opening with wireless control |
Orientation: VELUX VCS skylights must be installed in the orientation shown for the model and should not be rotated to create another format.
Solar Operation, Rain Sensor & Controls
The external solar panel recharges a concealed battery pack. A wireless wall control is supplied, and the integrated rain sensor automatically closes the skylight when rain is detected.
- Pre-installed opening motor
- External solar panel
- Concealed rechargeable battery
- Wireless wall control
- Integrated rain sensor
- Optional compatible smart-control upgrade
Roof Types & Custom Flashing
VCS requires custom-made flashing. Central Skylights supplies matching flashing for tiled roofs, Corrugated, TrimDeck and Klip-Lok applications, with the actual detail determined by roof profile, pitch, water direction and kerb design.
Roof Types
- Concrete tile
- Terracotta tile
- Corrugated metal
- TrimDeck
- Klip-Lok
Custom Options
- Prefabricated
- Flat Pack
- Colorbond colour
- Backflash where required
- Raised / inclined detail where appropriate
Kerb, Upstand & Installation Planning
VCS is curb-mounted. The timber base/kerb, lining, waterproofing and flashing need to be coordinated so the roof loads and water path are properly managed.
- Confirm roof material and roof pitch
- Confirm water-flow direction
- Plan kerb/upstand before flashing is ordered
- Allow for the 57.2kg skylight during lifting
- Check ceiling / shaft position below
- Plan backflash and wall details where required
VELUX recommendation: use a slight 3°–5° pitch where practical to help reduce water ponding and condensation build-up.
VCS 4646 Specifications & 5 Buying FAQs
| Model | VELUX VCS 4646 |
|---|---|
| Product type | Solar-powered opening flat-roof skylight |
| Throat size | 1275 × 1275mm |
| Internal glass | 1104 × 1104mm |
| Daylight area | 1.22m² |
| Ventilation area | 1.65m² |
| Weight | 57.2kg excluding flashing |
| Roof pitch | 0°–60°; slight 3°–5° pitch recommended where practical |
| Flashing | Custom-made flashing required |
| Insect screen | Removable insect screen included |
| Blind | Matching FSCC Solar Honeycomb Blackout compatible; FCM accessory tray not required for VCS |
1. Does the VELUX VCS 4646 need mains power?
No mains wiring is required for the VCS skylight motor. The external solar panel recharges a concealed battery pack. Other electrical or smart-home work is separate.
2. Will the VCS 4646 close automatically if it rains?
Yes. VCS includes an integrated rain sensor that automatically closes the skylight when rain is detected.
3. What flashing do I need for VCS 4646?
VCS requires custom-made flashing. Central Skylights supplies matching 4646 flashing for tile, Corrugated, TrimDeck and Klip-Lok roofs, with Prefabricated or Flat Pack options and backflash where required.
4. How heavy is the VCS 4646?
The VCS 4646 weighs approximately 57.2kg excluding flashing. Delivery access, lifting method and roof access should be planned before installation.
5. Should I choose VCS 4646, VCM 4646 or FCM 4646?
Choose FCM 4646 if you only need daylight, VCM 4646 for manual ventilation, and VCS 4646 for solar-powered remote ventilation with automatic rain closing.
Same nominal roof opening · different operation
FCM 4646 vs VCM 4646 vs VCS 4646
Choose fixed daylight, manual ventilation or premium solar-powered ventilation using the same nominal size family.
FCM 4646Fixed daylight. Best when ventilation is not required.View FCM 4646 →
VCM 4646Manual opening. Ventilation without the solar motor.View VCM 4646 →
VCS 4646Solar opening. Wireless operation, automatic rain closing and solar-recharged battery convenience.
Compare the family
Compare Nearby VCS Sizes
Choose the roof opening only after comparing daylight area, ventilation area, weight and the room proportions below.
Optional light & heat control
Add the Matching FSCC 4646 Solar Honeycomb Blind
The matching FSCC blind provides room darkening, glare and heat control with wireless solar operation. The separate ZZZ 199 tray is required for FCM installations, not for VCS.
View FSCC Solar Honeycomb Blinds →Good Reasons to Add the Blind
- Bedrooms
- West-facing rooms
- Privacy
- TV/media areas
- Strong summer sun
VELUX Premier DealerGenuine VELUX products and specialist advice.
12,000+ installsCentral Skylights installation experience since 2018.
Noble ParkMelbourne showroom and warehouse pickup.
Supply or InstallSupply-only or professional Melbourne installation.
Solar Skylight + Correct Flashing + Optional Blind
Central Skylights supplies genuine VELUX VCS solar skylights, matching custom Colorbond flashing and compatible FSCC solar blinds for homeowners, roofers, builders and renovators.
Gideon Matilda –
Just swapped out five fixed skylights while getting the roof reshingled. The previous Velux models had been up there for 27 years. The top three skylights, which are on a steep angle, were in fantastic condition, so it was tough to part with them. The bottom two, however, showed some signs of wear due to the gentler roof pitch. I was able to find replacements that matched all five skylights perfectly in size. Installation went off without a hitch! Thank you Central Skylights!
Anselm Hilda –
Very good product!
Alvar Richard –
The skylight arrived promptly, and I couldn’t be happier with Central Skylights. It allowed me to move my project forward smoothly. I truly appreciate your excellent service.
Roger –
Perfect, exactly what I needed
Erastus –
Perfect product, exactly what I needed
Theophilus –
I came across Central Skylights online, and when it was time to replace my 23-year-old Velux window, I decided to trust them. Although I haven’t installed the new window yet, it arrived quickly and in excellent condition. Plus, it was the best price I could find.
Radley D –
The description matches perfectly. Very good
Phelan –
Fantastic product, speedy delivery. Thank you!
Benedict J –
The shipping date was revised three times, which negatively impacted my reputation with customers who were counting on me for the installation
Anselm V –
Very beautiful, exactly what I was expecting!
Fergus C –
After moving into my home, I installed this skylight, and its quality is significantly better than the one I had replaced
Dalziel R –
Excellent at taking orders, very good service
Silas H –
Good products and great service
Theophilus –
Impressively fast delivery, thank you!
Sherwin –
The price was excellent, shipping was swift, installation was effortless, and the product quality is top-notch
Bellamy –
Performs as expected
Cyrus R –
Outstanding service paired with swift delivery
Harold T –
Outstanding service paired with remarkably fast delivery!