How To Measure Corner Windows

What Is A Corner Window?

A corner window arises when two windows meet at the corner of a room. Corner windows occupy more than one surface of the house, and the corner may or may not be supported by a window frame.

We can design one frame to occupy your entire corner window, with a special corner post supporting the panels in the corner of your window. Please refer to the instructions below for help with measuring up for a corner window.

Corner windows are available to purchase from our Standard (imported) Manufacturer only. We cannot offer self-service for corner or bay windows.

Measuring For A Corner Window

Corner windows can be a little trickier to measure than stand-alone rectangular windows. We've tried to make the measuring process straightforward, but if you get stuck you can always reach out with photos of your corner windows and we'll guide you through the process. Essentially, you can treat your corner windows like two separate windows - one left (L) and one right (R). 

To get started, you'll also need to work out which frame type you'll be using on your window; will you be inside mounting or outside mounting your shutters? 

You will need:

• Metal measuring tape
• Paper
• Pen
  
  

When designing your shutters, we will treat the corner window as two separate windows. First, design Corner Window L. Next, design Corner Window R. Once you’ve placed your order, we will combine the two windows into a single corner window for you!

Measuring For An Inside L-Frame

Let's begin by separating your corner window into two separate windows - Left Corner Window (L) & Right Corner Window (R). We start measuring from the left.

Remember, we're measuring for an Inside L-frame, so we always measure inside the recess. Be sure to measure along the front wall - the section of the recess closest to the wall, not the window panes.

1. Measure the width of the left Window (L)

• Start inside and on the very edge of the left hand recess.
• Measure to the corner (the point where the two recesses meet).
• Measure this distance in 2 different places. 
• Mark your Measure Point L with a pencil.

2. Measure the width of the right Window (R)

• Start at Measure Point L and measure to the end of your right window recess.
• Measure this distance in 2 different places.

3.  Measure the drop

• From bottom to top in 3 different places

4. Select the smallest of your 3 measurements

Windows With A Sill Or Full Length Windows

A window sill projects into the room further than any other side of your window. If you're unsure whether your window has a sill, check out this article. When measuring for a corner window with a sill, we need to begin by finding our Measuring Point.

1. Start from the left hand recess
2. Run a piece of string along your sill to the window pane opposite the left hand recess, keep the string place
3. Begin again from the right hand recess
4. Run a second piece of string along your sill to the window pane opposite the right hand recess

Full Length Windows

Windows with a Sill

5. double-check your measuring point by measuring your clearance in 4 places (see navy lines). If all 4 points have the same clearance, move to step 6. Otherwise, move your string slightly until clearances are identical.
6. Follow measuring instructions above for width (steps 1 + 2), using your measuring point to measure Windows L & R.

Measuring For An Inside Z-Frame

Let's begin by separating your corner window into two separate windows - Left Corner Window (L) & Right Corner Window (R). We start measuring from the left.

If you don't have one already, you'll need to request a sample pack. Having a Z-frame template on hand will make this process much easier.

Remember, we're measuring for an Inside Z-frame, so we always measure from inside the recess. 

1. Find your measure points

• Place the profile of the Z-frame up against the corner of your window (where the recesses meet) and make a mark for Measure Point L.
• Repeat the above step, this time placing the profile against the opposite side of the corner and make a mark for Measure Point R.

2. Measure the width of the left Window

• Start inside the left hand recess.
• Measure to Measure Point L.

3. Measure the width of the right Window

• Start at Measure Point R.
• Measure to the end of the right hand recess.

4. Measure the drop of your Window

• Bottom to top from inside the recess
• Measure in 3 different places
• Provide the smallest of 3 measurements

Measuring For An Outside L-Frame

Let's begin by separating your corner window into two separate windows - Left Corner Window (L) & Right Corner Window (R). We start measuring from the left.

Remember, we're measuring for an Outside L-frame, so we always measure from the edge of the architrave. If your window is square set (i.e. no architrave), measure from the edges of the inside of the window - we'll then add to your measurement to ensure your shutters can be installed as an outside mount.

1. Measure the width of the left Window (L)

• Start at edge of the left hand architrave.
• Measure to the corner (the point where the two architraves meet).
• Measure this distance in 2 different places. 
• Mark your Measure Point L with a pencil.

2. Measure the width of the right Window (R)

• Start at Measure Point L and measure to the edge of your right window architrave.
• Measure this distance in 2 different places.

3.  Measure the drop

• Bottom to top from the outer edges of your architraves
• Measure in 3 different places

4. Select the largest of your 3 measurements

Measuring is a critical part of the Design Process. Once your order has been processed, we will always call you before finalising to ensure measurements are accurate. If you’re confused or have any questions about measuring, please send us an e-mail or give us a call. One of our team would be happy to help out!

Multiple Panels

Shutter Panels

Shutters are split into panels. If your window is wider than approx 950mm, you will be required to add a second panel. You can select as many panels as you like, provided the panels are between 350mm and 900mm. We recommend matching the layout of your window. If your window panes is split evenly, our Design Centre will  select the number of 'evenly split' panels automatically.

What If I Require Multiple Panels, But Have Uneven Sized Window Panes? 

You can customise your own panels widths to match the layout of your window, provided that each panel is less than 900mm. We recommend matching panels with the design of your vertical window panes.

Multiple Panels For Corner Windows

Shutters designed for corner windows have a corner post where the two windows meet. The corner post will extend slightly into each side of the window. This may impact the width of the two panels closest to the corner. We need to keep this in mind when measuring for multiple panels. There are two options for multiple panels in a corner window:

1. 1. Equal width Panels

• This is a great option where each window only requires two panels or a T-post is not required.
• For shutter with more than two panels or where a T-post is required, the T-post won't line up with the vertical mullion in your window.

2. Custom width Panels

• If your window is broken up into more than two sections, you might want to put a T-post in front of each break in your window. To make sure that the T-posts line up properly, you will want to measure for custom width panels. 
• Remember, this will mean that your inner most panel is narrower than the others.

Measuring Custom Panel Widths

Begin each measurements from the far left:

• For an inside mount, start from the inside of the recess;
• For an outside mount with an architrave, start from the edge of architrave;
• For an outside mount with no architrave, start from the edge of your window.
• Measure to the breaks in each of the panels (i.e. where one panel will meet the other).

Learn more about measuring for multiple panels.

Surcharge

Fitting custom made shutters to corner windows takes additional effort and time and also requires specialty parts. Due to this, we charge a further 10% for the price of all corner window shutters.