Roof windows are often high and hard to reach. With an electric drive, you can open and close them at the touch of a button or via a remote control, and a rain sensor automatically closes them. Here you can read which drive is suitable, how to control the window, and what the cost of retrofitting is.
In brief: You open a roof window electrically with a chain or linear actuator, depending on the weight and size of the sash. A 24 V actuator needs a control unit such as the VS-C24-7A and is operated by button or radio remote control. A rain sensor closes the window automatically when it starts to rain.
Which drive system fits the roof window?
- Chain drive VS-KA: flat, inconspicuous and suitable for most roof windows. From 65 € net.
- Linear actuator VS LA: for heavy wings and light domes with high lifting force. From 110 € net.
Weight, wing size and the desired opening distance are crucial. The lift is determined by the Stroke calculator, the necessary strength of the advisors Calculate thrust. More information about the selection of chain drives is available in the guide. Chain actuator for roof windows.
How to control the roof window
For a 24-V drive you need a power supply with control. The VS-C24-7A controller Converts 230 V to 24 V and opens or closes the drive by reversing the polarity. It is operated via the button on the device or with the remote control. radio remote control VS-C24-F-1. Especially with high roof windows, the remote control saves an additional line to the button.
Up to 10 drives can be connected to a controller, depending on the power consumption. They then operate together, for example all the roof windows in a room.
Automatically closes when it rains
An open roof window allows water to enter quickly when it rains. A Rain sensor VS-RS (33 € net) or one Wind-rain light sensor VS-WRLS (55 € net) is connected to the control unit and automatically closes the windows. Details are provided in the guide. Rain sensor for windows.
Cost example: a roof window with radio and rain sensor
| Position | Net price |
|---|---|
| Chain drive VS-KA 24 V (250 N, 100 mm stroke) | 65 € |
| VS-C24-7A controller | 60 € |
| radio remote control VS-C24-F-1 | 14 € |
| Rain sensor VS-RS | 33 € |
| Material overall | 172 € |
Prices as of October 23, 2026, plus VAT. In addition, there are wiring and installation costs for an electrician. The guide provides more examples. How much does an electric window drive cost?.
24 V or 230 V?
A 230-V drive is sufficient for a single roof window with wall buttons. Once several windows are to be operated together, a sensor must be connected or a radio remote control must be used; 24 V with control is the better choice. The detailed comparison can be found in the guide. Window actuator 24 V or 230 V.
Frequently asked questions
Can I retrofit an existing roof window?
In most cases, yes. The drive is attached to the frame and wings using brackets. A standard bracket set is included in the price for VS-KA and VS-LA. How the retrofit is carried out is shown in the guide. Retrofitting electric window openers.
Do I need a controller for each window?
No. A VS-C24-7A control unit powers up to 10 drives, depending on the power consumption. All connected drives run together.
Is the control suitable for smoke extraction?
No. The VS-C24-7A is intended for daily ventilation. An approved RWA control panel is required for RWA.
Request a quote
Please send us the dimensions, weight and a photo of your roof window via the Contact form or use the measurement sheet. We assemble the drive, control, and accessories together for you.