Inside-Mount Measuring with a Protruding Sill
A sill changes the bottom reference point for an inside-mounted shutter, particularly when the sill projects or slopes. Use that result for this step.
In this article
Before you measure: check usable recess depth
For an inside mount, start by checking the shallowest clear depth in the recess. As a general guide, aim for approximately 70 mm of unobstructed space, measured only to the first handle, winder, lock, key, flyscreen or other fitting that projects into the shutter area.
If you have around 70 mm or more of clear usable depth, you can normally continue with the inside-mount measuring steps.
Less than 70 mm does not automatically rule out an inside mount. Frame choice and obstruction position can change what is possible. Check Handles, Winders & Other Shutter Obstructions before finalising the mount.
Inside Mount: Square-Set Window with Sill
- From the top surface of the sill, take three drop readings up to the inside top of the recess.
- Take three width readings within the recess.
- Submit the smallest width and the smallest drop from those readings.
Inside Mount: Window with Sill and Architrave
- Starting on the top of the sill, take three drop readings to the inside top of the recess.
- Take three width readings within the recess.
- Submit the smallest width and the smallest drop from those readings.
Before ordering: if usable recess depth is below approximately 70 mm, or if handles, winders, locks or flyscreens enter the shutter space, check Handles, Winders & Other Shutter Obstructions before finalising your inside-mount dimensions.
Ready to Enter the Shutter Order?
Once the measurements and layout are confirmed, enter them on the plantation-shutter product page.