Exterior Door Threshold EXTENDERS - for 4 9/16" or 5 5/8" Door Thresholds

HARTFORD BUILDING PRODUCTS

Exterior Door Threshold Extenders

Add width to your exterior door threshold for a deeper door frame or wall. These extenders attach to compatible Endura thresholds sold by Hartford Building Products, providing extra coverage and a finished appearance.

Fits our Endura thresholds only. These extenders are not universal. Choose the version made for your existing threshold width: 4 9/16 inches or 5 5/8 inches.

Choose the right fit

  1. Confirm compatibility: Check that you have an Endura threshold supplied by Hartford Building Products.
  2. Measure front to back: Identify whether your existing threshold is 4 9/16 or 5 5/8 inches wide.
  3. Select the matching option: Choose the correct threshold width and either Mill/Silver or Dark Bronze.

The sizes below identify the threshold the extender fits, not the amount of width it adds. Check the selected product's dimensions before ordering.

Shop threshold extender options

For 4 9/16-inch thresholds

Fits our 4 9/16-inch Endura inswing thresholds only.

For 5 5/8-inch thresholds

Fits our 5 5/8-inch Endura inswing thresholds only.

If a link opens the extender collection, select the matching threshold width and finish from the available products.

Threshold extender FAQs

When do I need a threshold extender?

Use one when your door frame or wall is deeper than the threshold. The extender adds front-to-back coverage for a more complete finish at the entry.

Will these fit other threshold brands?

No. These extenders fit only our compatible Endura thresholds. They are not universal accessories.

Are the two sizes interchangeable?

No. Match the extender to your existing threshold: 4 9/16 inches or 5 5/8 inches. Measure front to back, not across the doorway.