Window Replacement in Stone Veneer — Cut-Back, Sill, Flashing Behind
Manufactured stone wraps the front of the house or the whole lower wall, the windows set in it have failed, and nobody wants to see a saw go into the stone.
Reply within one business day. Or call / text 763-204-2099.
Window replacement in stone veneer comes down to the stone: an insert sets inside the old frame and leaves the stone alone, while a full-frame install means cutting the stone back, flashing the new window to the wall behind it, and patching stone and sill back to the new frame. JMB Builders does both across the Twin Cities metro. Priced per window, quoted from photos or at a free in-home estimate, with a reply within one business day.
- Priced per window, insert or full-frame
- Inserts leave the stone untouched
- Full-frame: stone cut back, flashed, patched
Manufactured stone veneer, the cast stone glued to a scratch coat over lath and house wrap, is on the front of most two-stories built since the late 1990s and on the lower walls of a lot of ramblers and walkouts. The windows in those walls were set before the stone went on, and the stone was brought up to the window frame with a bead of sealant. That joint is the only thing between the water running down the stone and the window frame.
When the windows fail, the stone is the problem. An insert window is the way most people go: the old frame stays, the new unit sets inside it, and the stone is never touched. The exterior joint is cleaned and re-sealed, and the inside gets new stops. Where the old frame is rotted, leaking at the sill or the window is changing size, it is full-frame, and that means the stone comes back far enough to pull the old frame, flash the new window to the house wrap, and reset stone and a new sill piece against the new frame.
The sill is the detail that matters on a full-frame job. Stone walls need a sloped sill, cast or cut stone, under the window, with flashing behind it, so water that gets behind the stone drains out instead of into the wall. Many builder installs skipped it. Interior painting is quoted as a separate line — or leave it primed and caulked and paint it yourself.
Get a written quote for this job
Three photos and a sentence is enough: a reply within one business day, or ask for a free in-home estimate. Or text the photos to 763-204-2099.
What you supply
- Your pick of window style, exterior color and glass
- The stone product and color name if you have it from the builder, or any leftover pieces in the garage
- Whether you want inserts that leave the stone alone or full-frame with the stone patched
- Photos of each window from outside with the stone around it, one from inside, and a close-up of the joint at the sill
What JMB supplies
- In-home measure of every opening and a look at the stone-to-window joints and the sill
- The windows, ordered to size
- On inserts: old sash and stops out, new unit set in the old frame, exterior joint cleaned and re-sealed
- On full-frame: stone cut back cleanly, old frame out, rot repaired, new window flashed to the wrap
- Sloped sill stone and flashing behind it on full-frame installs
- Stone patched back to the new frame with matching pieces, mortar joints matched
- Interior stops, stool and casing, or jamb extensions on a drywall return
- Photos of the finished windows in your job folder
How it is priced: per window
Quoted in writing from your photos, with a reply within one business day. What moves the number:
- Insert with the stone untouched vs. full-frame with the stone cut back and patched
- Whether the stone product is still made, or has to be matched from a discontinued line
- A sloped sill stone added where the builder set the stone flat to the frame
- Rot in the sill and sheathing behind a stone wall that never drained
- Stone on the whole wall vs. a wainscot under lap siding, where only the sill is stone
- Number of windows in the stone
Send one photo of each window from outside with a foot of stone around it, one from inside, and a close-up of the joint where the stone meets the frame at the bottom corner. Name the stone if you can.
How long it takes
Inserts in stone: four to six a day. Full-frame with stone cut back, flashed and patched: one to two windows a day, with the mortar curing after we leave.
How your project works
- 1
Send photos, get a written quote
Send three photos of the space and a sentence about what you want. You get a clear, itemized reply within one business day. Prefer a look in person? A free in-home estimate is always an option.
- 2
Pick materials, or bring your own
We help you choose profiles and materials that fit the house and the budget, or match your existing millwork exactly — or you buy the door or trim yourself and we install it. Everything is confirmed before the crew is scheduled.
- 3
Clean, precise installation
The crew shows up on time, protects floors and furniture, and installs with tight joints and consistent reveals. Photos of the finished work go in your job folder.
- 4
Walkthrough and invoice
We walk the finished work with you. If anything is not right, we fix it before we call the job done. Then one invoice, paid by check or direct deposit — no card fees, no payment links.
Situations and options
Insert, stone untouched
The new unit sets inside the old frame. The stone, the sealant line and the sill stay where they are; the old joint is cut out and re-sealed to the new frame. The usual choice on a stone wall.
Full-frame with stone patch
Stone cut back a few inches around the opening, old frame out, new window flashed to the wrap, new sloped sill stone, stone pieces reset to the frame with matched mortar. For rotted frames or a size change.
Stone wainscot under siding
Where stone runs only to the window sill and lap siding is above, the siding is handled normally and only the sill stone is reset. Cheaper than a window set in full stone.
Discontinued stone
When the stone is no longer made, pieces are taken from a hidden spot, behind a shrub or under a deck, to patch around the window, and a close match goes in the hidden spot.
Window Replacement in Stone Veneer — Cut-Back, Sill, Flashing Behind: questions, answered
Can you replace windows in a stone veneer wall without cutting the stone?
Yes, with insert windows. The old frame stays in the wall, the new unit sets inside it, and the stone is not touched. The sealant joint between stone and frame is cut out and re-sealed to the new unit. It is the right choice when the old frame is sound and the window is staying the same size.
What happens to the stone on a full-frame window replacement?
It is cut back a few inches around the opening with a saw, far enough to pull the old frame and flash the new window to the house wrap behind the stone. After the window is set, matching stone pieces are mortared back to the new frame and a sloped sill stone goes under it. The patch line is at the mortar joints, so it disappears once the mortar cures to color.
Why is my window leaking in a stone veneer wall?
Water runs down the stone and gets behind it at the mortar joints, which is normal and expected; the house wrap behind the stone is supposed to carry it down and out. At a window, that water hits the frame. If the stone was brought flat to the frame with no sloped sill and no flashing behind, the water sits on the frame and the sill rots. The fix is a full-frame install with flashing and a sloped sill, not more caulk.
Will the patched stone match the rest of the wall?
If the stone is still made, yes: pieces in the same product and color blend in once the mortar cures. If it is discontinued, we take pieces from a hidden spot on the house and patch there with the closest match. Mortar color is matched to a sample from the wall.
Does a window in stone veneer need a sill stone?
Yes. The stone makers call for a sloped sill under every window, cast stone or cut stone, with flashing behind it, so water drains off the stone and away from the frame. A lot of builder installs ran the flat stone right up to the frame instead. On a full-frame install we add the sloped sill and the flashing behind it.
Is window replacement in stone veneer more expensive than in siding?
Inserts cost about the same as in any wall, because the stone is not touched. Full-frame costs more, because the stone has to be cut back, the window flashed, a sill stone set and the stone patched, and the mortar work takes a second visit or a long day. We quote both so you can decide window by window.
Recent JMB work, from our job log
59 installs recorded across 30 Twin Cities communities since Dec 2025. Window and door installs for homeowners and the builders we work with. Counts come straight from our job log; no customer names.
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Read morePage reviewed October 10, 2026 · JMB Builders LLC, MN license BC809005 · All windows pages
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