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How to Measure Double Roller Blinds
Get the right measurement for every window
Getting Started
Measure, customise, and install with confidence – we’re here to help you every step of the way.
Getting your measurements right is the first step toward achieving a professional, custom fit for your roller blinds. Whether you’re choosing
manual chain control or going motorised, measuring inside the window frame or outside it — we’ve made it simple.
Before You Start
Let’s make sure you’re ready to measure:
Chosen your mounting style – Inside Mount or Outside Mount?
Decided on control types – chain, motorised, or a mix?
Ordered your free fabric samples?
Downloaded the Check Measure Worksheet?
Read Mike’s measuring tips?
What You’ll Need
Steel tape measure or Laser distance measurer
Grey lead pencil
Step ladder (if needed)
Pen and paper or worksheet
Step-by-Step Measuring Guide
Product Overview
Double roller blinds combine two blinds on one bracket—usually a sunscreen/light filter for daytime and a blockout for night.
This gives you flexible control over privacy, light, and insulation—perfect for bedrooms and living areas.
1
Choose Mounting Options
Inside Mount
Built-in look
Requires minimum 100mm depth
Expect small light gaps
2
How to Measure
Width
Measure inside the window frame at the top
Width in mm for Inside Mount Roller Blinds
Drop
Measure from the top of the recess to the desired finish point
Drop in mm for Inside Mount Roller Blinds
Important: Ensure 100mm depth is available across the top for the bracket.
Outside Mount
Ideal for shallow reveals or obstructions
Improves blockout and privacy
Makes windows appear taller and wider
Recessed ceiling pelmets
2
How to Measure
Width
Measure from the outer edge of the architrave to the opposite outer edge, or your desired coverage
Width in mm for Outside Mount Roller Blinds with Architrave
Drop
Measure from the top of the architrave or wall to where you want the blind to finish
Drop in mm for Outside Mount Roller Blinds
Important: Ensure space allows for 148mm bracket height.Ensure space allows for 148mm bracket height.
Square Set Window
Width
Measure the full width of the window opening at the top
Add at least 70mm to each side (140mm total) to allow for full fabric coverage and reduce light gaps
This becomes your bracket-to-bracket width
Width in mm for Outside Mount Double Roller Blinds Square Set Window
Drop
Measure from at least 150mm above the top of the reveal to your desired finish poin
This ensures room for the double bracket height (148mm) and provides space for proper coverage
Then measure to at least 150mm below the bottom of the reveal, or to the floor if preferred
Final Notes
This total measurement becomes your drop size
We’ll take care of any fabric deductions — just measure and enter to the exact millimetre
Drop in mm for Outside Mount Double Roller Blinds on a Square Set Window (No Architrave)
Important: Installing your double roller blind on a square set window (no architrave)? Here’s how to get the right measurements:
Specifications
Width (per blind):
Min: 250mm (chain) / 550mm (motor)
Max: 3000mm
Drop:
Min: 300mm
Max: 3000mm
Bracket Setup
Top Front Double Bracket (Inside Mount):
Compact, flush finish
Back blind: front or back roll
Front blind: front roll only
Top Back Double Bracket (Outside Mount):
Keeps fabric close to wall for better blockout
Back blind: back roll only
Front blind: front or back roll
Obstructions?
Check for latches, handles, or vents. Mix roll directions if needed.
Important Measuring Notes
Always measure in millimetres (mm)
Enter bracket-to-bracket width
We’ll handle all fabric deductions for you
Use a metal tape or laser
Measure every window—even if they look the same
Better to be 1mm short than 1mm too long
Roll Direction Tips
Check for any obstructions: handles, locks, vents
Inside Mount
Front roll avoids obstructions
Outside Mount:
Back roll brings fabric closer to the window for better blockout
Choose Your Control Side
Decide which side you’d like each blind to operate from (left or right) as you face the window.
Chain, motor, or a mix – the choice is yours
Want to keep things simple and save on cost? A popular option is to have a chain control for the back sunscreen blind, which often stays down during the day, and add a motor to the front blockout blind – since that’s the one you’ll be moving up and down most often.
Control Options
Manual Chain Drive
Simple, reliable manual control
Choose from white, black, metal, or stainless steel chain
Spring assist is automatically included for blinds over 1800mm wide
Supplied Chain Lengths
We provide the ideal chain length based on your selected drop:
Drop 300–800mm = Chain 500mm
Drop 801–1050mm = Chain 750mm
Drop 1051–1550mm = Chain 1000mm
Drop 1551–1900mm = Chain 1250mm
Drop 1901–2200mm = Chain 1500mm
Drop 2201–2600mm = Chain 1750mm
Drop 2601–3000mm = Chain 2000mm
Child Safety
All chain-operated blinds come with a child safety cleat and stop balls, in line with legal requirements and to maintain your warranty.
1. RollerIQ – Smart Home Ready
App and voice control with no remote required
Works with Apple HomeKit, Google Home, Alexa
Uses Matter over Thread technology
Widths: 550mm – 3000mm
Charging: USB-C (cable sold separately)
Battery Life: Up to 12 months per charge
2. Automate Zero Li-ion – Wireless & Quiet
12V rechargeable motor hidden inside the roller tube
Remote controlled (Push 15 or Push Pro)
Charging: Automate charger and cable (sold separately)
Battery Life: 10–12 months per charge
Widths
550mm – 2000mm: Q1.1 motor
2001mm – 3000mm: Q2.0 motor
Remote Options:
Push 15 Remote – Control up to 15 blinds across 5 groups
Push Pro Remote – Control up to 30 blinds with offline timers and 15 group channels
3. Automate Wand – Direct, Simple Control
Up/down/stop buttons on a detachable magnetic wand
No remote required
Widths: 550mm – 2000mm
Charging: USB-C cable (sold separately)
Ideal for kids' rooms, family homes, or older adults
Bottom Rail & Bracket Colours
Bottom Rail: Flat profile, standard on all blinds
Colours: White, Black, Anodised Silver
Bracket Colour:
White – clean, minimal look
Black – bold contrast
Label Each Window
Start at the front door and label windows clockwise through the house.
Include room names (e.g. Living Room, Bedroom 1). Helps keep track during ordering.
How to Order
1. Choose Double Roller Blinds under Product Type
2. Use the filters to find your ideal fabric combination
3. Enter your width and drop (in mm)
4. Select your control type for each blind (chain, motor, or both)
5. Choose control side and roll direction for each
6. Pick your mounting type and bracket style
7. Use Simple or Advanced Customisation
8. Add to cart and checkout
How to measure for Double Roller Blinds - Outside mount
How to measure for Double Roller Blinds - Inside mount
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