Measuring instructions wooden venetian blinds for boxed bay windows
Boxed Bay Window
Use a metal tape measure to ensure accurate measurements
3 Options For Fitting Wooden Venetian Blinds On Boxed Bay/Square 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 dependent on a minimum frame size larger than the head-rail depth.
Measure from the corner to the glass, if the frame is less than the head-rail depth then go for option 1 or
Option 3: Good if you have small side windows
If the side windows are so small that once the bracket allowance is deducted they will be too small to be made.
This method does result in a gap between the blinds and the glass will be visible.
Wooden Venetian Blinds For Boxed Bay Windows Bracket Dimensions
25mm/35mm Slat Sizes
Depth: 53mm | Height 65mm
50mm Slat Sizes
Depth: 56mm | Height 71mm
Wooden Venetian Blinds For Boxed Bay Windows Headrail & Valance Dimensions
25mm/35mm Slat Sizes
Depth incuding valance: 57mm | Height 42mm
50mm Slat Sizes
Depth incuding valance: 74mm | Height 42mm
Step 1: Choose the slat size
When measuring for angled bay windows you need to allow for the head-rail and valance depth and window handles which affect the size of the blind when fitted.
There are 3 different slats sizes which will affect the sizes of the brackets and head-rail.
Once you have chosen the slat size you can use the illustration above to determine the allowance which will be referred to as X for the next step.
Headrail Allowance:
25mm / 35mm slat size: X = 57mm50mm slat size: X = 74mm
Step 2
Find the handles allowance. If you have window handles, measure how far out they protrude. e.g. 5.5cm (55mm) in the image oppo-site. This will be referred to as Y for the next step.
example Y = 55mm
Step 2
Calculate total allowance.
Add (Y) to the allowance for the head-rail and valance depth (X) that you noted down from the previous page to get Z.
If there are no handles ignore this allowance.
Total allowance will be calculated using the following:
X + Y = Z
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 separately as they are often different and note the sizes down then deduct X from that size.
e.g. 50mm slat size : 55mm Handle allowance
Side window 870mm wide
Total allowance: Z = X (74mm) + (Y) 55mm = 129mm
870mm - 129mm = 741mm wide
3) Order the two side blinds as EXACT 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 the depth of the head-rail then we recommend to not use this option and use option 1 or option 3.
1) Measure the full width of the front window and deduct TWICE the bracket & handle allowance Z.
e.g. 50mm slat size : 55mm Handle allowance
Front window 2000mm
Total allowance: Z * 2 = X (74mm) + X (74mm) + Y (55mm) + Y (55mm) n= 258mm
2000mm - 258mm = 1742mm wide
2) Measure the full width of each side window separately as they are often different and note the sizes down then deduct X from that size.
e.g. 50mm slat size : 55mm Handle allowance
Side window 870mm wide
Total allowance: Z = X (74mm) + (Y) 55mm = 129mm
870mm - 129mm = 741mm wide
3) Order the all 3 side blinds as EXACT 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 & handle allowance Z.
e.g. 50mm slat size : 55mm Handle allowance
Front window 2000mm
Total allowance: Z * 2 = X (74mm) + X (74mm) + Y (55mm) + Y (55mm) n= 258mm
2000mm - 258mm = 1742mm wide
2) Measure the full width of each side window separately 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 the window sill.
