Jan Keffer17 reviewsTotal number of Google reviews Jan has written across all businesses on Google Maps, not just this one.
Review from Google · view on GoogleBrian was excellent, on time, knowledgeable thank you
Nelson Alarm Indianapolis
How the Experts Score is calculatedEach factor is scored 0–100 on absolute terms (standing in the category can only raise it), then weighted; problems flagged in review highlights or a recent slide in ratings are subtracted:Satisfaction 55%90+49.1Reliability 24%88+21.3Value 14%99+14Replies to reviews 7%50+3.5Craft & service penalty85−1.5Experts Score= 86Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews.86SCORE
AGradeLetter from the Experts Score: A = 80+, B = 60–79, C = 40–59, D = 20–39, F = under 20.
#30 of 44 security system installersPosition by Experts Score among all companies we track in this category. · better than 33%
4.9 ★★★★★ 133 Google reviews · 9 photos
95%five-star reviews
4.87★last 12 monthsAverage stars on reviews from the last 12 months only.
1.5%1–2★ in 2 yearsShare of 1–2★ reviews in the last 24 months — or the 20 newest reviews when the company had fewer than 20 in that time.
2%reviews answered by the owner
Sep 2026latest review
Nelson Alarm Indianapolis at a glance
Customers consistently praise Nelson Alarm technicians for punctuality, professionalism, and clear communication during installations and repairs. Recurring themes include quick problem resolution and helpful explanations of system functions. However, lower-rated reviews highlight concerns regarding billing practices, specifically unauthorized charges after service cancellation and perceived unreasonable fees for parts that required separate ordering.
- Google rating: 4.9 out of 5 from 133 reviews (95% five-star).
- Reviews on this page: 133 Google reviews (97 with written comments).
- Owner responses: the business replied to 2% of reviews.
- Most recent review: September 29, 2026.
- Service: Security System Installer serving Indianapolis, Indiana.
Data from Google, last updated October 29, 2026.
Score profile vs other security system installers
Score per factor (100 = best)Each factor is scored 0–100 on absolute terms (star average, share of 1–2★ reviews, price verdicts…); standing within the category can only raise it, never lower it.. Strongest: momentum and value; weakest: replies to reviews.
SatisfactionSatisfaction · 54% of the scoreRecency-weighted star average (2-year half-life), shrunk toward the category mean by review volume; the company’s own lifetime average as the prior; absolute: 4.0★ = 0, 5★ = 100.Nelson Alarm Indianapolis: 90/100 on this factor. Category median: 92.A
90
ReliabilityReliability · 24% of the scoreHow rarely jobs go badly: share of 1–2★ reviews — 60% the last 24 months (or the 20 newest if fewer), 40% all-time; 0% = 100, 15%+ = 0; the category percentile can only raise it.Nelson Alarm Indianapolis: 88/100 on this factor. Category median: 92.A
88
Craft & serviceCraft & service · penalty only, up to −10 pointsGoogle review highlights: Quality, Professionalism, Responsiveness, Punctuality — how rarely reviewers flag them as a negative, per review since highlights began; 0% = 100, 5%+ = 0. Subtracted from the score (up to −10), never averaged in — clean highlights are the norm, not a bonus.Nelson Alarm Indianapolis: 85/100 on this factor. Category median: 98.A
85
ValueValue · 14% of the scoreCustomers’ own price verdicts (Great / Reasonable vs Overpriced) and Value highlights; 65% absolute (all “reasonable” ≈ 80, “great” = 100), the category percentile can only raise it.Nelson Alarm Indianapolis: 99/100 on this factor. Category median: 100.A
99
MomentumMomentum · penalty only, up to −10 pointsPenalises only a real slide: last-12-month average below lifetime (−0.5★ = 0). Still 4.8★+ over the last year, or steady/improving = 100. Subtracted from the score (up to −10), never averaged in.Nelson Alarm Indianapolis: 100/100 on this factor. Category median: 100.A
100
Replies to reviewsReplies to reviews · 7% of the scoreHow often the owner publicly replies to reviews under 5★ (1–4★). Needs 3+ such reviews, otherwise not counted; 65% absolute (80%+ replied = 100), the category percentile can only raise it.Nelson Alarm Indianapolis: 50/100 on this factor. Category median: 45.C
50
Bar = this company · dark tick = category median.
Star ratings
133 Google reviews we collected
- 5 stars12795%
- 4 stars22%
- 3 stars11%
- 2 stars00%
- 1 star32%
Praise vs complaints
Phrases our text analysis found in 97 written reviews
- Praise16698%
- Complaints42%
Topic share
How often each topic comes up in the written reviews
- Staff & attitude5633%
- Speed & response4024%
- Quality & results3118%
- Would recommend2012%
- Communication127%
- Honesty & trust64%
- Price & value53%
What customers talk about
We read 97 written reviews and marked every phrase about these topics. The same colors are highlighted in the reviews.
“Brian was excellent, on time, knowledgeable thank you”
“Mark quickly changed out our malfunctioning device, set it up in our security profile and completed everything very quickly.”
“Nelson Alarm added to our existing system and did an awesome job.”
“Nelson Alarm has been my go-to for both home and business security for years.”
“Great personality and explains everything clearly .”
“As a business owner myself, I know how valuable reliable service and strong reviews are, and Nelson Alarm consistently earns both!”
“100% satisfied, price is reasonable compared to the market.”
“The self-serv companies offer weak products and the old school, hands-on security companies are too expensive.”
People customers mention
- Mitch 6 reviews
praise complaint · found by our text analysis, Google review wording unchanged.
Recent reviews
Elizabeth4 reviewsTotal number of Google reviews this person has written across all businesses on Google Maps (not just this one). More reviews usually means a more experienced, trustworthy reviewer. · a month ago★★★★★
Efficient, quiet and friendly. Our installation went off without a hitch. Mark and Logan did a great job!
John6 reviewsTotal number of Google reviews this person has written across all businesses on Google Maps (not just this one). More reviews usually means a more experienced, trustworthy reviewer. · 2 months ago★★★★★
Nelson Alarm added to our existing system and did an awesome job. Their technician, Jim, was very professional and courteous. We would highly recommend them.
Dianne5 reviewsTotal number of Google reviews this person has written across all businesses on Google Maps (not just this one). More reviews usually means a more experienced, trustworthy reviewer. · 5 months ago★★★★★
Mark was here and fixed the problem quickly. He tested the alarm to be sure all was working correctly after he replaced the sensor. He also went over the system with us again to be sure we understood how it all worked. Very courteous and professional.
KristeLocal Guide · 22 reviewsTotal number of Google reviews this person has written across all businesses on Google Maps (not just this one). More reviews usually means a more experienced, trustworthy reviewer. · 9 months ago★★★
I have always been really pleased with Nelson Alarm. But, I recently had an issue and needed service. They didn’t bring the right item to fix my issue and had to order a part. They have since come back and put in the ordered item, but I feel like the charge was unreasonable. The whole thing has really…
Sandy9 reviewsTotal number of Google reviews this person has written across all businesses on Google Maps (not just this one). More reviews usually means a more experienced, trustworthy reviewer. · 11 months ago★★★★★
Quick to get the job done in the time quoted! It was rainy. Took off his shoes without asking.
Rick7 reviewsTotal number of Google reviews this person has written across all businesses on Google Maps (not just this one). More reviews usually means a more experienced, trustworthy reviewer. · a year ago★★★★★
Mitch was friendly and efficient. Thanks so much to NELSON ALARM for helping to keep our church building and church family safe.
Photos
Customer reviews
4.9 ★★★★★ 133 reviews on Google · rating breakdown
Reviews from Google, shown as published (original wording, unedited).
Team members customers mention
Elizabeth Boling4 reviewsTotal number of Google reviews Elizabeth has written across all businesses on Google Maps, not just this one.
Review from Google · view on GoogleEfficient, quiet and friendly. Our installation went off without a hitch. Mark and Logan did a great job!
John Weisenbach6 reviewsTotal number of Google reviews John has written across all businesses on Google Maps, not just this one.
Review from Google · view on GoogleNelson Alarm added to our existing system and did an awesome job. Their technician, Jim, was very professional and courteous. We would highly recommend them.
janet ellisLocal Guide · 338 reviewsTotal number of Google reviews janet has written across all businesses on Google Maps, not just this one.
Review from Google · view on GoogleVery good service
Korey Niemann3 reviewsTotal number of Google reviews Korey has written across all businesses on Google Maps, not just this one.
Review from Google · view on GoogleMark did a great job!
Dianne Gibson5 reviewsTotal number of Google reviews Dianne has written across all businesses on Google Maps, not just this one.
Review from Google · view on GoogleMark was here and fixed the problem quickly. He tested the alarm to be sure all was working correctly after he replaced the sensor. He also went over the system with us again to be sure we understood how it all worked. Very courteous and professional.
Michael KelleyLocal Guide · 16 reviewsTotal number of Google reviews Michael has written across all businesses on Google Maps, not just this one.
Review from Google · view on GoogleRex was wonderful and did a great job!!
Kriste LoveLocal Guide · 22 reviewsTotal number of Google reviews Kriste has written across all businesses on Google Maps, not just this one.
Review from Google · view on GoogleI have always been really pleased with Nelson Alarm. But, I recently had an issue and needed service. They didn’t bring the right item to fix my issue and had to order a part. They have since come back and put in the ordered item, but I feel like the charge was unreasonable. The whole thing has really disappointed me in a company that I put a great deal of trust in.
Sandy Wilson9 reviewsTotal number of Google reviews Sandy has written across all businesses on Google Maps, not just this one.
Review from Google · view on GoogleQuick to get the job done in the time quoted! It was rainy. Took off his shoes without asking.
Rick Vale7 reviewsTotal number of Google reviews Rick has written across all businesses on Google Maps, not just this one.
Review from Google · view on GoogleMitch was friendly and efficient. Thanks so much to NELSON ALARM for helping to keep our church building and church family safe.
Business details
- Address: 2602 E 55th St, Indianapolis, IN 46220
- Phone: (317) 255-2125
- Website: nelsonalarm.com
- Service area: Indianapolis, IN