Measuring instructions roller blinds for boxed bay windows
Boxed Bay Window
These can be used for:
Roller blinds
Electric roller blinds
Cordless roller blinds
Use a metal tape measure to ensure accurate measurements.
Fabric on a roller blind is 35mm narrower than the full bracket to bracket size meaning that on a bay window where two blinds are fitted next to each other the gap will be approximately 40mm. This may prevent all the glass being covered.
3 Options For Fitting Roller Blinds On Boxed Bay Windows
The first thing to do is decide how you want to fit your blinds. Choose from option 1, 2 or 3. Review the summary next to each image for tips on which is best for your window.
Option 1: The most common method of installation
This method is designed to ensure that the two side blinds butt up against the front blind which is measured to fill the entire width of the front window.
Option 2: The most tricky method of installation
For the confident measurer, this gives a more professional fit as the blinds meet in the corner but is dependant on a minimum frame size of 70mm. Measure from the corner to the glass, if the frame is less than 70mm then go for option 1 or 3 to avoid the blinds not covering the glass properly.
Option 3: Good if you have small side windows
Where the side windows are so small that once the bracket allowance is made they’re too small to be made.
This method does result in a gap between the blinds and the glass will be visible.
Bracket Allowance
Roller blind brackets can be rotated to be either top fixed where you screw the blind into the top of the recess or face fixed where the brackets are screwed facewards into the window frame.
Deciding to face fix or top fix is determined by where you have room to fit the brackets.
The size of roller blind bracket are different depending on the size of the blind.
Use the information below to determine the bracket allowance.
Bracket Allowance = X
If you have decided to top fix
Bracket allowance for blinds up to 2000mm wide x 2500mm drop: X = 53mm
Bracket allowance for blinds up to 2500mm wide x 2700mm drop: X = 56mm
If you have decided to face fix
Bracket allowance for blinds up to 2000mm wide x 2500mm drop: X = 65mm
Bracket allowance for blinds up to 2500mm wide x 2700mm drop: X = 71mm
Note down the X value for the next step.
Bracket Allowance = X
Top Fix
Face Fix
Option 1: The most common method of installation
1) Measure the full width of the front window. Order as RECESS SIZE
2) Measure the full width of each side window seperately as they are often different and note the sizes down then deduct X from that size.
e.g. Top fix fitting: 870mm wide x 1800mm drop. Side window 870mm - X (53mm) = 817mm
3) Order the two side blinds as BRACKET TO BRACKET SIZE.
Option 2: The most tricky method of installation
On both corners measure from the corner of the bay to the start of the glass, if either measurement is less than 70mm then we recommned to not use this option and use option 1 or option 2.
1) Measure the full width of the front window and deduct TWICE the bracket allowance X.
e.g. Top fix fitting: 2000mm wide x 1800mm drop. Front window 2000mm - X (53mm) - X (53mm) = 1894mm
2) Measure the full width of each side window seperately as they are often different and note the sizes down then deduct X from that size.
e.g. Top fix fitting: 870mm wide x 1800mm drop. Side window 870mm - X (53mm) = 817mm
3) Order ALL THREE blinds as RECESS SIZE.
Option 3: Good if you have very small side windows
1) Measure the full width of the front window and deduct TWICE the bracket allowance Z.
e.g. Top fix fitting: 2000mm wide x 1800mm drop. Front window 2000mm - X (53mm) - X (53mm) = 1894mm
2) Measure the full width of each side window seperately as they are often different and note the sizes down, no deductions are made.
3) Order ALL THREE blinds as RECESS SIZE.
DROP
1) Measure the full drop of the window from where the brackets are mounted to where the fabric should finish.
Window Handles
If your window has any handles that protrude out affecting the blinds then please order them as reverse roll.
The fabric will then fall over the front of the tube, missing the handles. See images.
Reverse roll
