How to Cut a Roller Blind Down to Size: A Comprehensive Guide

When installing roller blinds in Melbourne, typical sizes may not suit your windows. Cutting roller blinds to size is important for blockout blinds that must block all light or decorative blinds that must match an architectural style. This tutorial will help you trim your roller blinds for a precise fit, improving your space’s functionality and appearance.

Assessing Your Needs and Preparation

Assess your demands and prepare before cutting roller blinds. According to Brighter Blinds and Doors, having the correct equipment and knowing size changes may make or break a professional installation.

The Tools and Materials Needed

  • Measurement tape
  • A pencil or marker
  • Long ruler or straight edge
  • Sharp scissors or utility knife
  • Cut mat or protected surface

Make sure all instruments are in good shape and adequate for cutting roller blind materials, especially thicker blockout materials that require a sharper blade.

Measuring Your Window

Measure the window where the roller blind will go carefully. Determine whether the blind will go inside or outside the recess by measuring the window frame width. Blockout roller blinds with outside mounts reduce light leaking at the corners.

Marking the Blind for Cutting

Once you have your measurements, it’s time to mark the blind accurately to ensure it will fit the window perfectly.

Step-by-Step Guide to Marking

  1. Extend the Blind: Roll out the blind fully on a clean, flat surface. Use a cutting mat or another protective layer underneath to avoid damaging the surface below.
  2. Measure and Mark the Blind: Using your measuring tape and a pencil or marker, carefully mark the new width directly onto the blind. Align a straight edge or long ruler along the marks to ensure a straight line.
  3. Double-Check Measurements: Before making any cuts, measure twice to ensure accuracy. Any mistakes at this stage can be difficult to rectify.

Cutting the Roller Blind

Cutting the roller blind requires precision and steadiness to ensure a clean, straight edge.

Techniques for Cutting Different Materials

  • Cutting fabric blinds requires sharp scissors. Scissors are better for delicate fabrics and control than utility knives.
  • Vinyl or Blockout Blinds: Utility knives work better with thicker materials like blockout roller blinds. Avoid jagged edges by making multiple smooth knife passes.

Steps to Cut the Blind

  1. Secure the Blind: Make sure the blind is secure and won’t shift as you cut. You may need an extra pair of hands to hold it in place.
  2. Use the Straight Edge: Place a straight edge along the line you’ve marked. This will act as a guide for your scissors or knife, helping you keep the cut straight.
  3. Cut Slowly and Steadily: Proceed with the cutting, following the straight edge closely. Take your time to ensure the line remains clean and straight.

Installing the Cut Roller Blind

After cutting the roller blind, install it. Correct installation is required to ensure smooth operation when reinstalling an adjusted blind.

Installation Tips

  • Check the Mechanism: Before hanging the blind, make sure the roller mechanism works, especially after cutting.
  • Secure Brackets: Fix mounting brackets. This is critical since loose brackets can impede blind operation.
  • Once installed, roll the blind up and down several times to ensure it travels smoothly and stops properly.


Cutting roller blinds to fit your windows exactly improves your space’s utility and aesthetics. These detailed methods allow Melbourne residents to install or adjust blockout roller blinds or any other roller blinds professionally. Right tools, careful measurement, and precision cutting will make your blinds look custom-made for your home.

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