Oversized & Historic Openings
Custom Size Exterior Door Installation for Oversized and Historic Openings
Zane's Door Replacement handles custom-size exterior door installation for Monterey homeowners with oversized or century-old openings. We measure the opening in person, check the surrounding walls and floor, and specify a door that fits the existing home instead of forcing a standard unit into a space it was never made for.
The width may be unusual, the floor may have moved, or the wall may be thicker than a modern prehung door frame expects.
Opening size
When Your Opening Isn't a Standard Size
An opening is oversized when it is wider than 36 inches or taller than 6 feet 8 inches. A standard residential door is commonly 3 feet wide, 6 feet 8 inches tall, and 1-3/4 inches thick. If your existing door falls outside those dimensions, a stock unit may not be the right starting point.
Historic homes often add another issue. The opening may not be square after years of settling, and the walls may not match a modern jamb depth. We look at the opening as it is.
First inspection
What We Inspect First in an Older Home
The door has to be specified for the opening you have, not for a clean rectangle on paper.
Wall depth
Why Wall Depth Changes the Door We Order
Width and height matter, but wall depth matters too. Some century-old homes have extra-thick walls, and that changes the jamb needed for the exterior door.
We take measurements on site before ordering. Bryan Zane is the person who measures the opening and installs the door, so the fitting decisions stay with the person doing the work.
Prehung door jambs are manufactured to fixed depths, commonly 4-9/16 inches for a standard 2x4 wall with 1/2-inch wall finish, per manufacturer installation specifications. A wall thicker than that standard needs a jamb extension or a custom-depth jamb, which is why we measure wall depth before ordering.
Custom sizing
When a Stock Door Won’t Fit
A modern stock door can be the wrong fit for a historic opening. When that happens, custom sizing may be needed, and changing the opening can mean cutting into walls or stucco.
We talk through that before the installation moves forward. You should know whether the goal is to preserve the existing configuration or change it for access, function, or current building requirements.
Under the 2010 ADA Standards for Accessible Design and California Building Code Chapter 11B, an accessible doorway needs a minimum 32-inch clear opening width, so an accessibility change affects the door and frame we specify. Altering the size or structure of an opening, rather than a like-for-like replacement, can also require a permit and must meet current California Building Code.
Character or change
Preserve the Historic Look or Change It
Some homeowners want the new exterior door to keep the same historic character. Others want to change the opening for easier access or a different use of the entryway. We have that conversation before a new door is ordered.
We won't treat a century-old opening like a standard replacement.
Final fit
The Final Fit Into Your Existing Walls
The last check is not just whether the door swings. The jamb has to frame correctly, and the door has to fit properly into the home's existing walls.
That is why in-person measurement comes first. A pre-hung installation with us is a complete replacement: new door, new jamb, new trim, every component replaced rather than reused.
Other work
Learn About Our Other Door Installation and Replacement Services
For a complete view of the services we offer, visit our how door replacement works page or one of the pages below.
Patio & Sliding Doors
Sliding glass and patio openings, including Jeld-Wen and Milgard units.
Exterior Doors
Entry doors specified as a complete pre-hung system for the opening.
Interior Doors
Doors inside the house, specified to the opening, hardware, and use of the room.
Frequently Asked Questions