Therma-Tru Home Additions & ADU Nationwide

Therma-Tru Home Additions & ADU: The Sherman Oaks Owner’s Guide

Rowan Construction Group Sherman Oaks installs Therma-Tru entry systems, sidelites, and patio door units in home additions and ADU projects across the San Fernando Valley, with typical installed pricing for ADU door packages running $450-$2,800 per opening depending on series and sidelite configuration. We stock Classic-Craft, Smooth-Star, and Fiber-Classic components on our trucks, and most Therma-Tru hardware or glass insert replacements in Sherman Oaks can be sourced same-day through our distributor in North Hollywood. Most homeowners discover a problem when the multipoint lock won’t engage after the ADU settles, or when they notice daylight between the door edge and the weatherstrip after the first hot Sherman Oaks summer.

Call (213) 221-0788

Which Therma-Tru Models This Applies To

Therma-Tru’s fiberglass door lines break into three series we specify regularly for Sherman Oaks ADUs and additions. Classic-Craft uses a hardwood edge and deep embossing that matches paint-grade trim common on Ventura Boulevard corridor builds. Smooth-Star is the go-to for stucco exteriors where a clean, paintable surface matters more than wood grain. Fiber-Classic sits in between, with a wood-grain texture and composite edge that resists the moisture cycling we see near the Los Angeles River basin.

To identify your unit, open the door and check the hinge edge for a stamped manufacturing date and series code, usually within 12 inches of the top hinge. The multipoint lock system varies by vintage: pre-2018 units often used a two-point latch, while current production runs three-point or five-point depending on door height. We source OEM multipoint hardware through Therma-Tru’s authorized channel, but for deadbolts and handlesets we also install Baldwin and Emtek equivalents that match the backset and faceplate dimensions without the OEM lead time. One compatibility gotcha: Classic-Craft doors with full sidelites require an extended multipoint strike plate that standard hardware kits don’t include, and we’ve seen that detail missed on two Sherman Oaks ADU projects that came to us for correction.

Signs Your Therma-Tru Home Additions & ADU Is Failing

• The multipoint lock won’t fully engage or requires shoulder pressure to latch. This usually means the door has dropped on its hinges or the frame has shifted in the rough opening, a common issue in Sherman Oaks additions built on post-1950s slab foundations that move slightly with seasonal soil moisture. The lock mechanism itself is rarely the problem; the alignment is.
• Visible gaps at the top or bottom corner of the door when closed. Fiberglass doors don’t warp like steel, but the frame can rack if the king studs weren’t plumbed properly during the addition framing. The gap lets conditioned air escape and can pull dust through during Santa Ana wind events.
• Condensation between glass panes on sidelites or door lites. This means the insulated glass unit (IGU) seal has failed. In Sherman Oaks, the thermal cycling between 90-degree days and 55-degree nights accelerates seal degradation compared to coastal microclimates.
• The door sticks seasonally, worse in summer than winter. Fiberglass expands and contracts less than wood, but the painted surface can build up enough to rub the frame if the reveal wasn’t set with clearance. We’ve measured 1/8-inch seasonal variation on south-facing ADU doors in the Galleria area.
• Weatherstrip is compressed flat or pulling away from the frame. Therma-Tru uses a Q-Lon or bulb-style seal depending on series. After five to seven years of UV exposure in the Valley, the material loses resilience and no longer seals against air infiltration.

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Replacement Cost & What’s Included

For Therma-Tru components in a Sherman Oaks home addition or ADU, our installed pricing breaks down as follows:

What drives the range: door size (standard 3/0 x 6/8 versus 8-foot or double-door units), whether the frame needs reframing due to settlement, and hardware grade. Every quote is a flat written price with line-item breakdown before work starts, under Clause 1 of the Haven Standard. Our 365-Day Done Right Promise covers the installation and hardware function. No change proceeds without a signed change order, which is how we’ve kept projects within a few percent of the agreed number across 4,000-plus jobs since 2007.

DIY or Call Us?

There’s a safe middle ground for Therma-Tru owners. You can check the hinge screws for tightness, verify the strike plate alignment with a flashlight, and photograph any glass seal failure for documentation. What we don’t recommend: adjusting a multipoint lock mechanism, removing an IGU yourself, or reframing a door opening. The multipoint system is spring-loaded and can snap back with enough force to damage the mechanism or your hand. More critically, an improperly sealed IGU replacement voids the Therma-Tru warranty and creates a moisture path into the jamb.

We’re an independent service provider, not affiliated with Therma-Tru. If you’re seeing gaps, sticking, or seal failure on a door in your Sherman Oaks addition or ADU, call (213) 221-0788. We’ll schedule a free estimate, inspect the unit, and give you a written price before any work starts.

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