Lower Merion Township · October to December 2025

Andersen windows and French doors in a stone house

Windows in the new addition and in the old stone walls were set and trimmed, along with a fir entry door and French doors in the stone.

Lower Merion TwpOct 2025

The windows on this Lower Merion stone house went in during the framing stage. This page covers the part people see from inside: the interior trim around every window, and the doors set into the old fieldstone walls.

Trimming out the addition windows

The October 2025 photos show the gambrel addition with its drywall finished and the windows trimmed. The units are Andersen, which you can see on the labels still on the glass in the wide picture window. Each window got jamb extensions to bring the frame flush with the drywall, a stool and apron at the bottom, and flat casing to match the rest of the house.

Wide Andersen picture window with a new jamb extension and casing

Multi-unit windows, like the long row of double-hungs in the main room, need the casing laid out so the mullion trim between units is the same width all the way across. That is easy to get wrong and obvious when it is.

Room with a long row of new double-hung windows, trimmed and ready for paint

Windows in thick stone walls

Old fieldstone walls are well over a foot thick and nothing about the openings is square. The December photos show windows set into the stone with new wood sills and trim inside. Each opening was shimmed to the window, not the other way around, and the gaps were closed with trim and a sealant that can move with the stone.

Double-hung window set into a thick fieldstone wall with a new wood sill

Doors in the stone

Under the front porch, a fir entry door with sidelights was set into the fieldstone wall in October. At the back, a pair of French doors with sidelights and transoms went into the stone in December, cased in white inside. A door in a stone wall needs a level sill above all else, because the stone will not let you shim the frame out of a crooked opening later.

Fir entry door with sidelights set into the fieldstone wall under the porch

French doors with sidelights and transoms in a stone wall, trimmed in white

A two-story window wall

The tallest room in the addition has a two-story wall of black-frame windows. Mulled stacks like this need solid blocking between the units and careful flashing at every joint, since a leak at the top shows up two floors lower.