Therma-Tru Custom & Geometric Windows Nationwide | Sightline Windows & Doors

Therma-Tru Custom & Geometric Windows in Los Angeles: What to Know First

Custom and geometric Therma-Tru windows in Los Angeles run $1,850 to $7,400 per opening installed, depending on shape complexity, glass spec, and framing condition. We are an independent Therma-Tru service provider, not an authorized dealer, which means we quote the work with no brand loyalty clouding the numbers. Most custom and geometric jobs in Los Angeles take one day per opening for a straight replacement; a full-frame arched or radius unit can push to two. This page is written for homeowners in Silver Lake, Hancock Park, Mar Vista, and the surrounding Los Angeles basin who already own Therma-Tru products and need a shape no stock window will replace. Call (509) 265-6387 and we’ll put the price in writing before anything gets ordered.

Call (509) 265-6387

Key Takeaways

• Therma-Tru custom and geometric windows in Los Angeles: $1,850-$7,400 per opening installed.
• We are an independent provider, not authorized by Therma-Tru; we specify parts by what the opening needs, not brand loyalty.
• Every quote includes the measured survey as the written scope. The price does not change once we start.
• The 365-Day Done Right Promise applies to every Therma-Tru window we install.
• Live phone coverage 24/7 at (509) 265-6387. A person answers.

How Therma-Tru Products Fail, and How We Fix Them

Therma-Tru builds doors first. Their window lines, particularly the custom and geometric units spec’d through the Terrace and Signature series, share hinge and sill hardware with the door division. That matters when a Los Angeles home has a radius-top window over a west-facing wall. Here are the failure modes we see most on custom and geometric Therma-Tru openings in Los Angeles County:

• Sill pan rot at radius corners. On Therma-Tru Signature radius windows, the sill pan is a bent extrusion with mitered corners. Water pools at the corner seams because the weep path is cut for stock rectangular units, not curves. We find the rot during the measured survey, not after tear-out. Fix: full sill replacement with a field-fabricated pan, sloped 6 degrees, with weep holes drilled to the new geometry. The survey documents it before the quote is written.
• Glazing bead shrinkage on arched tops. Therma-Tru’s Terrace series uses a vinyl bead that shrinks under sustained heat. A Los Angeles summer can hit a south-facing arch with 14 hours of direct sun. The bead pulls back at the apex, the glass drops 2-3 millimeters, and the unit loses its seal. Symptom: a fogged crescent along the top of the arch. Fix: reglaze with an aftermarket bead cut long and heat-set, or replace the sash if the spacer has failed.
• Cam lock misalignment on geometric shapes. Octagonal and trapezoid Therma-Tru casements use the same multi-point cam locks as their rectangular units. But a geometric frame flexes differently. The lock throws at the bottom and skips at the top. We re-shim the frame and re-time the lock rail. If the gearbox is worn, we swap it for a quality aftermarket mechanism with the same throw length as OEM. No drilling into the sash.
• Frame racking in oversized openings. On Therma-Tru units wider than 72 inches, the frame carries the weight of the sash through the side jambs. In Los Angeles, older wood-framed homes settle. The opening is no longer square. A stock Therma-Tru frame can rack 1/4 inch before the sash binds. We field-check every jamb with a laser before ordering. If the rack exceeds tolerance, the opening gets squared and re-flashed before the new unit goes in. That’s a written scope item, not a surprise upcharge.
• Weatherstripping compression set on curved units. Therma-Tru curved windows rely on a bulb gasket that compresses over time. In the Santa Monica marine layer, the gasket also picks up salt and grit. The seal becomes a felt wick. Fix: we strip the old gasket, clean the kerf channel, and install a marine-grade replacement. This is a 90-minute repair that restores the original air-infiltration spec.

Before

After

Our Therma-Tru Custom & Geometric Windows Process

Sonia Raman grew up in Silver Lake watching her grandfather caulk and reglaze Craftsman bungalows, and she’s been reading rough openings across Los Angeles County ever since. Her rule, “Measure once, write it down, then measure again,” is how every Therma-Tru job starts.

1. 1
   The measured survey. We take frame readings at six points per side, sightline measurements for curved units, and digital photos of every corner, sill, and lock. You keep a copy of this document. The quote cannot differ from it. That’s Haven Clause 1 and Clause 4 in practice.
2. 2
   The written quote. We name the price, the scope, the parts source (OEM or aftermarket, whichever matches better for the opening), and the date range. No allowances, no “to be determined” line items.
3. 3
   Parts decision. For a Therma-Tru warranty to survive, we use OEM hardware when the failure is structural. For weatherstripping, glazing beads, and non-warranty wear items, we use aftermarket parts that meet or beat the original spec and cost 20-40% less.
4. 4
   The install. The technician assigned to your job is background-checked, uniformed, and identified by license number before arrival. We protect the floor, remove the old unit, prepare the opening, set the new window, flash it, and seal it. Photos are taken at every step.
5. 5
   The test and the record. We cycle the window, check the lock throw, run a smoke test on the seal, and document the finished opening. You get the photo record and the written warranty. The 365-Day Done Right Promise covers every square inch.

What Therma-Tru Custom & Geometric Windows Costs in Los Angeles

Straight replacement of a Therma-Tru geometric window, same footprint, no frame work: $1,850 to $3,200 per opening in Los Angeles. Full-frame replacement with sill rebuilding and re-flashing: $3,200 to $5,100. Arched or radius units with custom glass: $4,500 to $7,400. Lead times on custom glass run 3 to 5 weeks from approved drawing. Here’s a Los Angeles-specific table:

What moves the price: the shape’s bend radius, the glass type (impact-rated adds 35-50% in Los Angeles coastal zones), the condition of the old sill, and whether the opening has settled out of square. Call (509) 265-6387 for a free estimate. The number we give you is the number on the invoice.

Why Los Angeles Homeowners Call Sightline Windows & Doors for Therma-Tru Work

Sightline Windows & Doors has installed over 18,000 openings since 2012, every one with a written price before work started and a documented photo record when it finished. We carry eight manufacturer lines, PGT, CGI, CWS, ES Windows, ECO Window Systems, Mr-Glass, Therma-Tru, and ViewLux, and we specify by performance tier and price range, not by margin. If a Therma-Tru opening would be better served by an ES Windows or a CGI unit, we’ll say so in the quote. Bring us a competitor’s written estimate and we’ll review it at no charge. If we can’t beat the scope on paper, we’ll tell you that too. The 365-Day Done Right Promise is stamped on every job under the Haven Standard: if it’s not done right, we make it right.

FAQs