Monterey Park Windows & Doors: Window to Door

A back window cut down to make a garden door in an older Monterey Park house: the wall below the sill, a longer header, the threshold and the step outside.

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Can the back window become a door to the yard? It is worth settling on the first site visit, since the answer sits in the wall below the sill. Turning a window into a door in an older Monterey Park house means cutting that wall down to the floor, carrying the load above on a longer header if the opening grows, and giving the new threshold a landing outside. When the framing allows it, the door goes where the window was.

What sits in the wall below the sill

An outlet, a heating register or a run of pipe can hide in the short wall under a window, and each has to move before that wall comes out. We open the plaster to see which. The cripple studs below the sill are removed, the bottom plate is cut at the new door width, and king and trimmer studs are set to the new size. If the door is wider than the old window, the header is sized for the longer span and posts carry its ends. The plaster around the new frame is then patched to meet the existing wall.

The threshold and the floor under it

A door puts weight and daily use on floor framing that used to sit under a wall. We check the joists and rim where the threshold will land and add blocking so the sill is fully supported. A sloped sill pan with a back dam goes in before the door, and the threshold height is set to the finished floor inside. Outside, a landing is built so the step down is comfortable and its surface drains away from the house. A French door or a single hinged door is chosen with panel lines that suit the rest of the house.

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