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Reducing the width or height of an electric roller door?

23rd January 2024

Understanding the Basics of Electric Roller Shutters

Electric roller shutters, commonly seen in forms like roller garage doors or industrial doors, are integral to numerous settings. They provide security, convenience, and insulation, but there might come a time when adjusting their size becomes necessary.

Key Considerations Before Resizing

Motor Type and Safety Devices: The type of motor and safety mechanisms like anti-drop brakes are crucial. Altering the door's size could impact the motor's functionality and the effectiveness of these safety devices.

Warranty and CE Marking: It's important to remember that resizing your electric roller shutter might void any existing warranties. Additionally, it will invalidate the CE marking, indicating that the product no longer meets the EU safety standards it once did.

The Process of Resizing

Measuring and Planning: Carefully measure the new dimensions required. Plan the process, considering the door's existing structure and the necessary adjustments.

Cutting the Axle and Curtain: This step requires precision and understanding of the door's mechanics. It's often the most time-consuming part of the process, as the axle and curtain will need re-assembling.

Rebalancing Motor/Spring: Adjusting the width can affect the balance of the motor and spring. Ensure this balance is restored to maintain functionality and safety.

Common Challenges

Time-Consuming Reassembly: The process of cutting and reassembling the parts can be lengthy and requires patience, attention to detail and specific tools ie; riveter.

Maintaining Balance: Ensuring the motor and spring are correctly balanced post-adjustment is critical for the smooth operation of the door.

Loss of Warranty and Certification: Be aware that any modification will mean losing the warranty and the product's compliance with certain standards.

Safety and Legal Notices

Modifying an electric roller shutter is not just about technical know-how; it's also about understanding the legal and safety implications. By altering the door, you're taking responsibility for the changes and their impact on the door's performance and safety standards.


Adjusting the size of electric roller shutters, whether they are roller garage doors or industrial doors, is a complex task that should not be taken lightly. Considering the motor type, safety devices, and the balance of the door is essential. Remember, such modifications come with significant implications regarding warranty and compliance with safety standards.

While this guide offers a general overview, seeking professional advice or assistance is always recommended for such technical tasks. Resizing your electric roller door can be a successful project with the right knowledge and precautions, but it's crucial to weigh the benefits against the potential risks and losses.

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