Garage Door Sensor Installation in New Hampshire | 911 Garage Door NH
from $99
Garage Door Sensor Installation in New Hampshire
Photo-eye safety sensor installation, alignment, and replacement. Required by UL-325 safety code — we test auto-reverse and verify the door stops on a 1.5-inch obstruction.
Garage Door Sensor Installation is one part of our garage door opener coverage in New Hampshire. For the full picture — symptoms, costs, and when to repair vs. replace — start with the complete Garage Door Opener Repair guide, or browse every garage door opener service we offer.
Photo-eye safety sensors are required by UL-325 on every garage door opener manufactured since 1993. They detect obstructions in the door's path and either reverse the door (during close) or refuse to start (when activated). When sensors are misaligned, dirty, sun-blinded, or failed, the door either refuses to close at all or — worse — closes without sensing an obstruction. Our sensor installation service replaces failed sensors, realigns drifted brackets, cleans the eye optics, and verifies auto-reverse on a real obstruction test.
Replacement eyes are brand-specific (LiftMaster has a different connector and signal pattern than Genie). We stock the major brands and most legacy models. Brackets occasionally need replacement when corrosion has degraded them or impact has bent them. Bracket alignment is critical — eyes that are slightly off-aim trigger intermittent close failures that drive homeowners crazy.
Every visit ends with an obstruction test: a 1.5-inch (3.8 cm) tall object placed under the door at three positions across the opening. The door must reverse when it touches the object. This is the UL-325 baseline — if the door doesn't pass, the install isn't complete. We document the test results on the work order.
Signs you need garage door sensor installation
Door refuses to close from remote
Misaligned or dirty photo-eyes prevent close. The opener's status light usually blinks 10 times to indicate the photo-eye fault.
Door closes part-way then reverses
Photo-eyes detecting a phantom obstruction (often sun glare or insects). Realignment or shielding usually fixes.
Photo-eye electronics fail at 10–15 years. Replacement is inexpensive and quick.
Our process
1
Call or schedule online. Book your garage door sensor installation in New Hampshire online or by phone and pick a 2-hour window. We confirm in under five minutes with the assigned tech's name and photo.
2
On-site diagnosis. On arrival we diagnose the garage door sensor installation on-site — free for most repairs, $39 on minor service calls (waived if you proceed). You see the issue and the fix before we start.
3
Flat-rate quote. You get a flat-rate garage door sensor installation quote in writing, good for 30 days — no hourly creep and no add-ons after the fact.
4
Same-visit fix. Most garage door sensor installation work finishes the same visit: our trucks carry the common springs, cables, rollers, and opener boards, so a second trip is rare.
How much does garage door sensor installation cost in New Hampshire?
Garage Door Sensor Installation the United States starts at from $99, every garage door sensor installation quote is flat-rate and presented in writing before work begins — no surprise add-ons, no hourly creep. Seniors (65+) and military save 10% on labor, and financing covers projects over $1,500 at 0% APR for 12 months, with no prepayment penalty.
Why homeowners in New Hampshire choose us for garage door sensor installation
We've been a trusted choice since 1974 — over 50 years of family-owned garage door service across New Hampshire. Our techs are CSLB-licensed (#1098234), background-checked, and complete an internal 12-week training program before rolling on calls alone.
Our garage door sensor installation carries a 10-year workmanship guarantee — separate from any manufacturer warranty on the parts themselves. If the garage door sensor installation we performed fails because of how we did it, we come back and fix it free for a full decade. Springs rated for 30,000 cycles carry a lifetime warranty for the original homeowner, and parts and accessories carry standard 1–5 year warranties by item.
We quote garage door sensor installation on honest scope: no unnecessary up-sell, salaried (never commissioned) technicians, and a transparent diagnostic so you see exactly what we see — including the parts still in good shape. If a repair is the right call we say so; if replacement is the better long-term economics, we say that. The flat-rate garage door sensor installation quote is written and good for 30 days.
Areas we serve for garage door sensor installation
We provide garage door sensor installation throughout New Hampshire, with fast coverage in every major New Hampshire metro.
Reach times for garage door sensor installation vary by traffic and time of day, so we quote an accurate ETA when you call — and the dispatch line routes straight to an on-call technician, no voicemail in between.
Frequently asked about garage door sensor installation
Top questions homeowners searching for Garage Door Sensor Installation near me ask us:
Are photo-eyes required by law?
UL-325 has required them on residential openers since 1993. UL-325 is the governing federal safety standard. Older openers without photo-eyes are non-compliant when replaced.
Can I replace photo-eyes myself?
Yes for matching same-brand same-generation replacements — relatively straightforward. Cross-brand replacements often don't work due to signal differences. Our flat-rate quote covers it installed, confirmed before we start.
How long does sensor work take?
Realignment: 15–30 minutes. Sensor replacement: 30–60 minutes. Full retrofit on an older opener: 60–90 minutes.
What's the coverage?
1-year manufacturer coverage on replacement sensors; 10-year workmanship on the install.
Will new sensors work with my old opener?
Same-brand same-generation: yes. Different generation: sometimes, depends on the model. Different brand: rarely. We match generation when ordering.