Older homes often have windows with proportions, profiles and divided-lite patterns that standard replacement units may not match. Custom sash can be built to suit your existing openings and original details, allowing sound frames and surrounding trim to remain.
Replacement sash needs to work with the existing frame, hardware and operating system. Your installer should confirm the fit and any adjustments needed before fabrication.
What is sash?
A traditional wood window has two main parts: the frame (jambs, sill and head), which is built into the wall, and the sash, the assembly that holds the glass. In an operable window, the sash moves; in a fixed window, it stays in place. Ordering replacement sash can let you keep a suitable existing frame, casing and interior trim.
Check the frame first
New sash is only as good as what it sits in. Before ordering, have your contractor or carpenter confirm that the frames, sills and jambs are sound and reasonably square. Resolve any repairs first, and have your installer confirm final dimensions for the opening the sash will actually fit.
Details that matter
The details give an old house its look, so these are worth discussing up front:
- Profiles. The shape of the rails, stiles and muntins. Share close-up photographs or an existing sample so we can review how closely the original details can be reproduced.
- Divided lites. The pattern and proportions of the glass divisions, such as 6-over-1 or 9-over-1.
- Glass. Tell us whether you want single-pane, insulated or decorative glass. The sash thickness, glazing details and existing frame help determine what will work.
- Wood species and finish. Share your preferred species and whether the sash will be painted or stained. Ask about available options, including Accoya, and what suits your project.
- Unusual shapes. Include photographs and dimensions for arched, curved-top or other specialty sash so we can review the shape and construction.
Installation
We build the sash, and installation is handled by your contractor, carpenter or window installer. If you need help finding someone, contact us about an installer referral in your area. Availability depends on the location and scope of the project.
Loop your installer in early. They can confirm measurements, hardware, balances or sash weights, weatherstripping and how the new sash will fit your existing frames.
Add storm windows for comfort
If drafts are a concern, custom wood storm windows may be worth considering alongside sash replacement. They add a separate layer over the primary window while retaining the original sash arrangement. Storm windows need their own opening measurements and installation details; sash dimensions alone are not enough to order them.
Older paint
If your home was built before 1978, existing window paint may contain lead. Make sure whoever removes the old sash follows lead-safe work practices.