Therma-Tru Door Installation Nationwide

Therma-Tru Door Installation: The San Francisco Owner’s Guide

Therma-Tru door installation in San Francisco typically runs between $1,800 and $4,600 for a full replacement with a compatible Therma-Tru slab, weatherstripping, and hardware, depending on the model line and whether the existing frame is salvageable. We stock common Therma-Tru replacement parts on our trucks and can usually complete a standard door swap in one day. The way most San Francisco homeowners discover a failing door is subtle: a draft near the threshold that wasn’t there last winter, or a deadbolt that no longer lines up without lifting the handle.

Call (831) 480-4124

Here’s the thing about Therma-Tru doors: they’re fiberglass, not wood, which means they don’t rot the way older wood doors do in San Francisco’s damp marine air. What fails first is almost always the weatherstripping, the corner seals, or the adjustable sill cap, not the door slab itself. Keith Yamada has seen this pattern hundreds of times in homes across the Sunset, Richmond, and Noe Valley districts: the door looks fine, the frame looks fine, but air moves through the corners and the lock binds because the slab has settled a fraction of an inch.

Which Therma-Tru Models This Applies To

Therma-Tru builds across several series lines, and the part compatibility is less forgiving than people assume. The Classic-Craft and Fiber-Classic lines share some dimensions, but the Smooth-Star and Pulse series use different hinge prep depths and sill profiles. If your door has a Therma-Tru label on the hinge edge, that label tells us the series, size, and production date, which is what we need to match a replacement correctly.

Here’s the compatibility gotcha most San Francisco homeowners don’t know: a Therma-Tru slab from one series will not fit cleanly into a frame from another series, even when both are labeled 36×80. The hinge mortises differ by as little as 1/16 inch, and that is enough to make the door bind or swing open on its own, something that matters when fog-season pressure differences push air against the entry. We default to OEM Therma-Tru parts when the existing frame is kept. For frames being fully replaced, quality aftermarket weatherstripping and threshold kits can work, but we will show you the difference in writing before anything is ordered. Lightwell Windows San Francisco is an independent installer, not a Therma-Tru dealer or affiliate, which means our recommendation is based on what your house needs, not what one brand’s catalog pushes.

Signs Your Therma-Tru Door Installation Is Failing

• Daylight visible at the door corners. The compression seals on Therma-Tru frames are designed to close tight, but San Francisco’s marine moisture causes them to stiffen and pull away over time. When you can see light, you are also moving air.
• The deadbolt only throws when you lift the handle. This usually means the hinge screws have loosened or the slab has settled slightly in the frame. It is an alignment issue, not a lock issue, and it gets worse with temperature swings.
• The bottom sweep drags on the threshold or leaves a gap. Therma-Tru’s adjustable sill cap can shift after years of foot traffic. Too high and the sweep wears out; too low and fog-season moisture seeps under.
• Condensation or mildew at the interior base. San Francisco’s damp soil and frequent fog mean moisture intrusion shows up here first. The fix is usually a new sill cap and threshold flashing, not a new door slab.
• The door rattles in the frame when closed. Weatherstripping has compressed past its working life. On Therma-Tru doors in the Richmond and Sunset, we typically see this by year eight to twelve, depending on sun exposure.

Replacement Cost & What’s Included

For a full Therma-Tru door installation in San Francisco, expect a parts-and-labor range like this:

• Full slab replacement, existing frame kept: $1,800 – $2,800 including weatherstripping, threshold adjustment, hinge re-shimming, and hardware remounting.
• Full unit replacement, frame and slab: $2,600 – $4,600 including tear-out, new frame, brickmould or exterior trim, sill pan, insulation, and weathering details matched to the home’s age.
• Weatherstripping and corner seal replacement only: $250 – $600, depending on how many seals are compressed and whether the corners need rebuilding.

Every price is written before any work starts, with no change orders unless you ask for something extra after the fact. The quote covers floor protection, shoe covers, haul-away of the old door, and a photo of the clean-up before the crew leaves. The work itself is covered by the 365-Day Done Right Promise: if it is not right, we make it right.

What drives the range in San Francisco specifically is access and frame condition. A Victorian in Noe Valley with a narrow staircase and a century-old frame takes longer and costs more than a 1990s Marina condo with a straight shot and standard framing. We will tell you which end of the range your home is on before we start.

DIY or Call Us?

What a homeowner can safely check: whether the hinge screws are tight, whether the weatherstripping is cracked or flattened, and whether the sill cap has visible damage. These checks take ten minutes and give us useful information when you call. What goes wrong with DIY on a Therma-Tru installation is almost always the same thing: the new slab is ordered based on a rough tape measurement, arrives a fraction off, and now the hinges are mortised wrong or the reveal is uneven. Fixing that costs more than doing it right the first time.

Door slabs are also heavy, typically 80 to 110 pounds for a Therma-Tru fiberglass unit, and lifting one into a finished frame while working alone is how shoulder injuries and doorframe damage happen. Our crew carries them in, sets them, adjusts them, and leaves the entry cleaner than we found it. If you are unsure whether your existing frame is worth saving, call (831) 480-4124 and describe what you are seeing. We will tell you honestly whether it sounds like a repair or a replacement.

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