Windows in South Austin, Austin, TX (January 2026)

Why did this South Austin home need new windows?

The original windows were decades old and leaking conditioned air. On a home built in this ZIP, that means a hot AC bill every summer and drafts you can feel by a window. New units were the fix.

• Full-home window replacement, not a partial swap
• Existing openings measured and re-fit for a tight seal
• Interior sills installed up to 96 inches wide
• Matching aprons added up to 96 inches

What did we find when we opened things up?

Older South Austin homes hide surprises behind the trim, and this one was no exception. Once we pulled the old windows, we found openings that needed reframing to sit square and carry a proper header. Our framing crew built new headers and, in one spot, created a fresh opening sized for an 8-foot header. That kind of woodwork is where a lot of DIY window jobs go wrong — people set a new unit into an out-of-square opening and wonder why it leaks air a year later. We took the time to frame it right before a single window went in.

What materials did we use, and why?

We chose NT Windows Twinsulator aluminum for its slim, strong frames and sharp black-on-black look. Aluminum holds its shape through Austin's 100-degree-plus summers without the sag you can get from weaker frames.

• OSI closed-cell spray foam packed around every window for an airtight seal
• Sherwin Williams 950A 55-year clear caulk on exterior seams and trim
• OSI foam cleaner used to keep finishes crisp during install
• Fresh siding to unify the exterior after framing

Closed-cell foam matters here. It blocks the air movement that drives up cooling costs and keeps out the cedar pollen that coats Austin homes each winter. A cheaper filler simply won't hold that line over time.

How did the installation go?

We worked in a clear order: windows first, then siding. That let us frame in old window and door openings before the new siding covered everything for a seamless finish.

• New window opening cut and framed with a header
• Aluminum windows set, foamed, and sealed
• A 6-foot sliding patio door assembled and installed
• A new 6-foot-8 garage door added — see our garage doors work
• Siding hung and every joint caulked tight

What were the results?

The home now presents as a clean, modern build with dark window frames against fresh siding. Air leaks are gone, and the exterior is sealed against moisture, heat, and pollen.

• Tighter, cooler interior in summer heat
• Crisp curb appeal from the new frames and siding
• Old openings framed in with no visible seams