Free in-home measure and quote - PGT, CGI and CWS impact lines compared on your actual openings, style by style
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Before
AfterTherma-Tru Custom & Geometric Windows in Kendall: What to Know First
We install and service Therma-Tru custom and geometric windows in Kendall as an independent provider, with most measured surveys scheduled within 48 hours and written quotes delivered before any work begins. Custom shapes, arched tops, and oversized geometric units typically run $2,800-$6,400 installed, depending on glazing specification and whether the opening requires structural reinforcement. We do not start work until you have our written price in hand, and that price does not change once the job is underway.
This page is for Kendall homeowners who already have Therma-Tru products and need custom or geometric window installation, replacement, or repair - arched windows, circular units, trapezoids, or oversized rectangular openings that standard stock sizes will not fill. If your home was built between 2015 and 2022 in neighborhoods like Dadeland, The Hammocks, or near the Turnpike corridor, there’s a fair chance we’ve already measured a Therma-Tru opening on your block. Call (786) 321-3319 to schedule your free measured survey.
How Therma-Tru Products Fail - and How We Fix Them
- Classic-Craft arched units develop seal failure at the springline. The curved top rail on Classic-Craft custom shapes uses a laminated finger-joint that expands differently than the straight stiles below. In Kendall’s humidity cycle - 85% summer mornings dropping to 55% by afternoon - that differential movement breaks the dual-seal perimeter on arched units after seven to ten years. We remove the sash, reseal with silicone structural glazing tape rated for the movement range, and replace the desiccant-filled spacer with a warm-edge unit.
- Fiber-Classic geometric windows show delamination at mitered corners. The fiberglass skin separates from the polyurethane core where compound miters meet in octagonal or hexagonal shapes, usually starting at the exterior corner and working inward. This is a material issue, not an installation error. We assess whether the core is still structurally sound; if it is, we inject structural epoxy and clamp the corner under controlled humidity. If the core has degraded, we specify a replacement sash with reinforced corner keys.
- Smooth-Star oversized rectangles sag at the header over 48-inch widths. Therma-Tru’s Smooth-Star line uses a pultruded fiberglass frame that flexes more than aluminum-clad alternatives when the aspect ratio exceeds 1.5:1. In Kendall, where many 2018-2021 homes feature 60-by-96-inch picture windows for the rear elevation, we see header deflection that compromises the operable sash below. Our fix is a steel-reinforced subframe installed during replacement, or a mid-span mullion on new construction that Therma-Tru’s stock drawings do not always specify.
- Custom simulated-divided-lite (SDL) grilles detach from impact-rated glass. Therma-Tru’s impact SDL systems use a surface-applied grille bar with a snap-in retainer; the retainer fatigues under the flex of laminated impact glass during pressure cycling. In Kendall’s hurricane-exposure zones, particularly east of the Turnpike, we find grille bars lifting at the ends after three to five years. We replace the retainer system with a mechanically fastened grille bar and add a bead of neutral-cure silicone at the glass interface, which preserves the warranty on the insulated glass unit.
- Doorlite sidelites with geometric patterns leak at the sill pan. Therma-Tru’s doorlite sidelites - the narrow windows flanking an entry door - use a separate sill pan that is often field-cut on site for custom widths. The factory sealant bead is discontinuous at the cut, and Kendall’s driving rain from the southeast exposes the gap within the first wet season. We remove the sidelite, fabricate a continuous sill pan from break-formed aluminum, and bed it in self-leveling sealant before reinstallation. The photo record shows the continuous bead before the unit goes back in.
Our Therma-Tru Custom & Geometric Windows Process
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Measured survey with the document you keep. Sonia Raman or a verified crew member arrives in uniform with license number visible, records every sightline dimension to 1/16 inch, and notes the existing frame’s plumb, level, and square. You receive this survey before we leave.
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Diagnosis and parts decision. We identify the Therma-Tru series, model year, and specific failure. OEM sashes and hardware are available for most current lines; for discontinued profiles, we source quality aftermarket equivalents that match the sightline and performance spec. We tell you which we’re proposing and why.
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Written quote, identical to the survey. Haven Clause 1: the measurement and the quote are the same document. The price includes all materials, labor, disposal, and the documented photo record. No line item is added later.
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Dry-fit before sealant. We set the frame or sash without sealant first, check operation, clearances, and sightlines, then document the fit with photos. This is where we catch what a rushed install misses.
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Installation and testing. We bed the unit, shim to the survey spec, fasten with the manufacturer’s required schedule, and test every operable sash for smooth travel and positive latch engagement.
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Cleanup, photo record delivery, and warranty registration. You receive the photo record within 24 hours, and the 365-Day Done Right Promise is active from that moment. Measure once, document it, then cut.
Before
AfterWhat Therma-Tru Custom & Geometric Windows Costs in Kendall
| Scenario | Typical Range | What Moves the Price |
|---|---|---|
| Custom arched replacement sash, single unit | $2,800 - $4,200 | Impact rating, grille pattern, size of radius |
| Geometric shape (octagon, hexagon, trapezoid), new opening | $3,600 - $5,800 | Structural header work, exterior finish matching |
| Oversized rectangular picture window, 60+ inch width | $4,200 - $6,400 | Steel reinforcement, crane or hoist need, laminated vs. monolithic glass |
| Doorlite sidelite repair, leak remediation | $890 - $1,600 | Sill pan fabrication, extent of water damage to framing |
| SDL grille replacement on impact unit | $340 - $680 per lite | Grille profile match, glass removal required |
These ranges reflect Kendall’s current material and labor costs. We do not adjust upward once the written quote is signed. If you have a competitor’s written estimate for the same scope, we will review it at no charge. Call (786) 321-3319 to schedule your free measured survey.
Why Kendall Homeowners Call Sightline Windows & Doors Kendall for Therma-Tru Work
We are independently owned and operated under the Haven Standard, not a franchise, and every one of the 18,000+ openings we have touched since 2012 carries a written price before work starts and a documented photo record when it finishes. The 365-Day Done Right Promise is stamped on every job, not offered as a courtesy.
Our technicians are background-checked, uniformed, and identified by license number before arrival - Haven Clause 3. The person at your door is the person on the record. We carry eight manufacturer lines - PGT, CGI, CWS, ES Windows, ECO Window Systems, Mr-Glass, Therma-Tru, and ViewLux - so if a Therma-Tru product is not the right specification for your opening, we will say so and show you the alternative in writing.
Live phone coverage is available 24/7. You will not reach a voicemail queue or a callback window.
FAQs
No. Therma-Tru’s warranty covers manufacturing defects in materials and workmanship; it does not require service by a factory-authorized dealer. As an independent Therma-Tru service provider, we use OEM parts where available and document every step so warranty claims remain valid. We keep the purchase records and installation photos you would need if a factory defect emerges later. Call (786) 321-3319 if you want us to review your warranty documents before we start.
Current-production Classic-Craft, Fiber-Classic, and Smooth-Star sashes and hardware typically arrive in 10-14 business days. Discontinued profiles or custom geometric shapes from the 2015-2018 era may require 4-6 weeks for OEM fabrication, or we can source quality aftermarket equivalents in 7-10 days. We tell you both timelines in the written quote so you can choose.
Repair makes sense when the frame is structurally sound and the failure is isolated to seal, hardware, or grille. Replacement is the better call when the frame has delamination, the insulated glass unit has failed, or the opening size or performance spec no longer meets current code. We do not recommend replacement for margin; we recommend it when the repair would cost more than half the replacement and last half as long. The measured survey includes both numbers.
Yes, for current color offerings. Therma-Tru’s fiberglass and steel lines use specific paint codes that we can reference to the factory. For faded or discontinued colors, we coordinate with a local finisher in the Kendall area who matches to a physical sample from your existing unit, not a screen representation. The match is documented with a wet sample before production begins.
It does not. Haven Clause 1 means the written quote and the measured survey are the same document. The only circumstance that would alter the price is hidden structural damage we could not have discovered during the survey - rotted framing, for example - and even then, we stop work, photograph the condition, and require your written approval before proceeding. In 18,000+ openings, this has happened fewer than thirty times. Call (786) 321-3319 for an exact quote on your opening; estimates are free.
Written by Sonia Raman, Owner, Sightline Windows & Doors Kendall at Sightline Windows & Doors Kendall, serving Kendall and nearby areas.