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Therma-Tru Home Additions & ADU: The Sacramento Owner’s Guide
A Therma-Tru door in a home addition or ADU in Sacramento typically carries an installed cost between $45,000 and $130,000 for the full structure, with the door itself running roughly $1,200 to $4,500 depending on series and glass package. We stock and install Therma-Tru-compatible replacement components for additions and accessory dwelling units across Sacramento, and most door swaps or part replacements are done in a single visit. Homeowners usually find us after they notice a door that won’t latch, a threshold that’s pulling away, or a frame that’s sagged enough to let Sacramento’s dry summer heat and winter damp straight into the unit. Sometimes it’s simpler: the door was fine, but the addition settled, and now the slab is out of square. Either way, the fix starts with identifying exactly which Therma-Tru series you have.
Which Therma-Tru Models This Applies To
Therma-Tru builds doors across several series, and the compatibility details matter more than most people expect. The Classic-Craft line (fiberglass, wood-grain texture) and Smooth-Star line (smooth fiberglass, paint-grade) share slab thicknesses of 1-3/4 inches, but their sill profiles differ. The Pulse series runs a wider stile and accepts different weatherstrip than a Classic-Craft of the same width. The fiberglass-composite Benchmark line, common in ADU builds because of the price point, uses a different hinge prep than the premium lines. If you’re replacing a part rather than the whole door, the label matters. Look for a sticker on the hinge edge of the slab: it lists the series, size, and build date. That sticker saves an hour of measuring and guesswork, and it prevents ordering a sweep for a Smooth-Star when you actually have a Classic-Craft with an adjustable sill. One gotcha we see in Sacramento: south- and west-facing ADU entries on older Therma-Tru doors often have UV-degraded weatherstrip that looks like it needs a full door replacement when it actually needs a $40 sweep and a sill cap adjustment.
On the OEM versus aftermarket question: Therma-Tru’s own components are matched to the slab’s exact profile, and we use them when the door is under manufacturer warranty or when the part is structural (sill, frame corner, multi-point lock). For wear items like sweeps, bumpers, and basic weatherstrip, quality aftermarket equivalents from Pemko or M-D Building Products do the job at roughly half the cost. We’ll tell you which is which and write the option into the quote before work starts. Bradford Remodeling Co Sacramento is an independent contractor, not a Therma-Tru dealer or authorized service partner, which means we’re not obligated to push OEM parts if a better-value equivalent exists.
Styles & brands we work with
Signs Your Therma-Tru Home Additions & ADU Is Failing
- Door won’t latch or deadbolt misaligns. The slab has sagged on its hinges, or the addition’s framing has settled. The cause is usually worn hinge screws failing to hold in the jamb, not a bad lock. Longer screws into the king stud fix this in most cases.
- Visible daylight or drafts at the bottom corners. The sill cap or sweep has worn out, or the adjustable sill has drifted below its setting. Common in Sacramento ADUs where the entry faces full afternoon sun and the sweep bakes brittle over three to five summers.
- Door sticks at the top or latch-side jamb. Framing movement from seasonal moisture swings in Sacramento’s clay-heavy soil. The slab is rarely warped; the jamb has moved. A re-shim brings the reveal back to spec.
- Weatherstrip peeling, cracked, or flattened. UV exposure kills Therma-Tru’s foam weatherstrip faster than most owners expect, especially on unshaded west entries. When it flattens, the door still closes but can’t seal against winter rain or summer dust.
- Water staining at the interior bottom corners of the jamb. The sill pan or the exterior caulk line has failed. Left alone, this rots the subfloor under the threshold, and that turns a simple part swap into an expensive substrate repair. Another Sacramento reality: in older additions with flatwork pitched toward the door, a new door won’t fix a drainage problem. The threshold needs to be raised or the walk re-sloped.
See the difference
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AfterReplacement Cost & What’s Included
For a Therma-Tru door in a Sacramento addition or ADU, here’s the straight pricing:
- Wear-part replacement (sweep, weatherstrip, threshold cap, hinge adjustment): $180 to $500 installed, depending on the part and how much the frame needs correction.
- Full door slab replacement (same jamb, new slab, hardware reset): $1,200 to $2,800 installed, glass package and finish being the main swing factors.
- New Therma-Tru entry door with frame, sill, and hardware, installed in an existing opening: $2,500 to $4,500, more if rot repair or sill-pan replacement is needed.
- Full home addition or ADU with Therma-Tru doors and windows set to spec: $45,000 to $130,000, with ADU construction as a separate build running $90,000 to $220,000 depending on utilities, foundation work, and finish level. That’s real money, and we give you a written price before any work starts, with no numbers that move at the door. The 365-Day Done Right Promise covers the full installation for one year: if the door, frame, or hardware fails inside that window, Bradford Remodeling Co Sacramento comes back and corrects it at no charge.
DIY or Call Us?
Replacing a sweep or adjusting a hinge screw is within reach for most homeowners. You’ll need a Phillips driver, a utility knife for trimming the sweep, and twenty minutes. What’s not DIY-friendly is anything involving the sill or the frame: the sill pan is a waterproofing component, and if you pull it without knowing how the door was flashed, you’ll invite water behind the jamb and into the subfloor. Same logic applies to adjusting a multi-point lock on a Pulse door; the linkage is tensioned, and forcing it can bend the rods and lock the door shut. That’s the kind of fix that costs more after a failed attempt than before. When a door fails on an addition or ADU in Sacramento, the structure around it has usually moved too, and finding that movement is where we earn the service call. Straight scope, firm price, no surprises after the drywall goes up. Call (279) 226-1509 and we’ll send someone out to look.
FAQs
A Therma-Tru fiberglass slab will last 20 to 30 years in Sacramento’s climate; the wear parts around it (sweep, weatherstrip, sill cap) last 3 to 7 years depending on sun exposure and use. Slabs rarely fail. Seals fail on schedule. Budget for a $200 to $500 refresh call every five years or so, and the door will outlast the addition itself. Call (279) 226-1509 for a specific assessment.
Most of what we see in Sacramento additions and ADUs is repairable: worn sweeps, flattened weatherstrip, sagging slabs corrected with re-shimmed jambs and longer hinge screws. Full replacement is warranted when the sill pan has leaked into the subfloor, when the slab is cracked through, or when the frame has rot beyond a cosmetic patch. The repair-versus-replace call is part of the free estimate, and we’ll show you the damage before quoting anything.
A sweep or weatherstrip swap takes under an hour on site. A full door-and-frame replacement in an existing opening runs a full day, two days if the subfloor under the sill needs repair. On ADU and addition work, we sequence the door installation after framing inspection and before final paint, so the jamb doesn’t get scuffed by drywall carts and ladders. We’ll give you a specific day on the written quote, not a window.
We carry common sweeps, bumpers, weatherstrips, and adjustable sill caps for Classic-Craft, Smooth-Star, and Benchmark lines on the truck, so a sweating or sticky door is often fixed the first visit. Series-specific slabs and frames come in from our Sacramento supplier within 3 to 5 business days. We also install KraftMaid, Cambria, and Silestone products on addition and ADU projects, so the door, the cabinets, and the counters all come from the same disciplined crew.
Written by Curtis Lane, Owner, Bradford Remodeling Co Sacramento, serving Sacramento and nearby areas. Curtis trained at Los Angeles Trade-Technical College and has run remodeling crews across Sacramento for the better part of two decades, including kitchen and bath work in Pocket-Greenhaven that still brings referral calls.
