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Unilock Windows & Doors: The San Antonio Owner’s Guide
If you own a home in San Antonio with Unilock windows or doors and a part has failed, we can source the replacement, confirm it matches your model, and install it properly. Depending on whether you’re replacing a single door component or addressing window hardware across several openings, you’re typically looking at $250 – $1,800 installed, with full window or door replacement running $4,500 – $15,000 in the San Antonio market. Most owners discover the problem the same way: a window that suddenly won’t stay open, a door that drags against the frame, or a lock that no longer turns with the key it came with. As an independent service provider, Elmstead Remodeling San Antonio is not affiliated with Unilock, but we work with their hardware regularly and match what’s on your home, not just what’s convenient to order.
Which Unilock Models This Applies To
Unilock window and door products vary by series, and the part you need depends on which line was installed. The most common Unilock lines we see in San Antonio homes include their vinyl slider windows, casement windows with crank operators, and hinged patio doors with multi-point locking systems. The quickest way to identify your series is to look for a label on the top edge of the door panel or the inside track of the window sash. That label usually carries a manufacturing code that tells us the year, glass package, and hardware set.
When it comes to OEM versus aftermarket, here’s the honest version: Unilock OEM parts are the safest match for multi-point door locks and crank operators because the screw patterns and gear ratios are specific to the series. For rollers, weatherstripping, and balance springs, quality aftermarket equivalents perform just as well and often cost 30 – 40% less. In San Antonio’s heat, aftermarket weatherstripping made from EPDM rubber actually outlasts some OEM foam seals, which dry-rot faster than anything else on a west-facing door. If you’re not sure which route makes sense, call us and we’ll walk through it with the part in hand.
Styles & brands we work with
Signs Your Unilock Windows & Doors Is Failing
- Window sash drops when you let go. The balance spring or block-and-tackle assembly has lost tension. In San Antonio garages and sunrooms, the coil spring inside the balance fails faster when dust from our limestone soil works its way into the track.
- Crank turns but window barely moves. The operator gear teeth are stripped, usually on windows opened daily during our long warm seasons. This is the number one Unilock casement part we replace.
- Patio door sticks or scrapes at one corner. The bottom rollers have flattened from years of weight and heat. Once a roller loses its round shape, it starts shaving the track, and the damage compounds.
- Multi-point lock only catches at the top or bottom. The door slab has settled and the keepers are out of alignment, or one of the lock rods has bent because the door was forced open at some point.
- Drafts or visible daylight around the weatherstrip. Unilock’s foam seals compress permanently after a few San Antonio summers, especially on south-facing doors. New EPDM or silicone bulb seals solve it in one visit.
See the difference
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After
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AfterReplacement Cost & What’s Included
In the San Antonio area, individual Unilock replacement parts with installation typically fall in these ranges:
- Crank operator replacement: $180 – $350 per window
- Balance spring or shoe replacement: $120 – $250 per sash
- Patio door roller replacement (both rollers + track cleaning): $250 – $450
- Multi-point lock replacement: $350 – $700 depending on series
- Full weatherstrip replacement on one door: $150 – $300
- Complete window replacement: $450 – $1,200 per window, with larger window packages running into the $4,500 – $15,000 range
Every price includes the part, the labor to remove and install it, and any adjustments needed to make the window or door operate smoothly again. We write the price down before we start, and that’s the number on the invoice. No line items added after the part is on the bench. Graham Stein coaches every tech to check the surrounding hardware while the window or door is apart, so we catch a secondary part that’s about to fail before it does.
DIY or Call Us?
Some Unilock maintenance steps are safe and straightforward for a homeowner. You can clean the tracks with a dry cloth, inspect weatherstrip for cracks, and tighten visible screws on the crank handle. You can also make a simple list: which windows are failing, what they’re doing, and whether the problem is worse in the morning or after a hot afternoon. That list helps us arrive with the right parts on the truck.
Where DIY goes wrong is with the balance springs and multi-point lock disassembly. The spring-loaded components in Unilock sashes are under consistent tension, and when they let go, they take fasteners and fingers with them. On patio doors, a heavy slab off its track can shift suddenly and pinch whoever’s nearby. If your window or door involves tensioned hardware or a door panel that needs lifting, call (432) 233-0976 and let a trained tech handle it. You’ll get a clear diagnosis and a written price before any work starts.
FAQs
Most Unilock windows and doors last 15 – 25 years in the San Antonio climate, but the hardware components fail sooner than the glass or frame. Rollers, crank operators, and weatherstripping commonly need replacement at years 7 – 12, especially on west- and south-facing openings that carry our afternoon heat.
Sometimes. A multi-point lock that’s just out of alignment can be adjusted without new parts, and a sticky crank can often be cleaned and re-lubricated. But stripped gears, flattened rollers, and collapsed balance springs are replacement items. We’ll always tell you which path is cheaper and honest before we order anything. Call (432) 233-0976 for a straight answer on your specific part.
Most single-part replacements for Unilock windows and doors take 45 – 90 minutes once we’re on site. A full day might cover three or four windows. We carry the most common Unilock operators, rollers, and weatherstrips on the truck, so we often finish the same visit without a second trip to the supply house.
We stock the highest-failure Unilock parts: crank operators for casement windows, patio door rollers, balance springs for common sash sizes, and multi-point lock keepers. Less common series-specific parts may take three to five business days to source. We’ll confirm availability during the initial call so you’re never waiting on a surprise.
Written by Graham Stein, Owner, Elmstead Remodeling San Antonio at Elmstead Remodeling San Antonio, serving San Antonio and nearby areas.
