Cloudy windows aren't dirty — they're broken.

If you see condensation, fog, or haze between the panes of your window, the seal on the insulated glass unit (IGU) has failed. No amount of cleaning will fix it. The good news: you don't need a new window. We replace just the glass unit while keeping your existing sash and frame intact — at a fraction of the cost of full window replacement.

Why insulated glass fails

Modern windows have two or three panes of glass separated by a sealed spacer filled with argon gas. Over time (typically 10–25 years), the seal breaks down, gas escapes, moisture enters, and condensation forms between the panes. This eliminates the insulating benefit and looks bad cosmetically.

Our glass services

IGU (insulated glass unit) replacement

For modern double or triple-pane windows. We measure your existing IGU, order a replacement unit matched to your specifications (low-E coating, gas fill, spacer color), and install it in your existing sash. The window looks and performs like new.

Single-pane glass replacement

For older single-pane wood windows, we cut new glass to size, set it with traditional linseed oil putty, and finish with paint. This preserves the historic character of your windows.

Reglazing

When the glazing putty around old windows cracks and falls out, the glass loses its seal and the wood underneath rots. We remove old putty, prime the wood, and apply fresh glazing compound. This protects both the glass and the surrounding wood.

Tempered or safety glass

Required by code in certain locations (near doors, low to the floor, in shower enclosures). We install tempered glass when needed for safety and code compliance.

Service across the Boston area

We replace fogged and broken window glass throughout Boston, Newton, Brookline, Cambridge, and surrounding communities.

Free quote

Call (617) 982-1211 with your window dimensions and we'll provide an estimate. Most IGU replacements are completed within 1–2 weeks of order.