The Best Security System Installers in Connecticut
We graded 10 companies on seven things customers actually report: satisfaction, reliability, workmanship, value, momentum, track record and how owners handle complaints.
From 22,133 Google reviews of 64 top-rated security system installers nationwide; 10 of them in Connecticut. Updated November 5, 2026.
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Best security system installers in Connecticut for installation
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CT Security LocksmithsHow Job match is calculatedBuilt only from reviews Google tagged “Installation”:Stars on this job 55%5.00★Number of such jobs 25%6Overall Experts Score 20%83Job match= 91Stars are pulled toward the category average (4.87★) when a company has few tagged jobs, so 3 perfect reviews don’t beat 80 great ones. 4.3★ scores 0, 5.0★ scores full. Volume is compared with the busiest company for this job.91Job match = this company’s ★ on reviews Google tagged “Installation” (shrunk toward the category average when there are few), how many such jobs it has done, and its overall Experts Score.
What customers said about installation
CT Security LocksmithsCraig was awesome. I called for service and he was here within 20 minutes. The installation of the door locks was quick and setup was easy. Craig was great to work with! Much appreciated.
CT Security LocksmithsI thank you for your service today,you were pleasant, reasonable,if I knew I could of called you last night,I would of now I know who to call,as stated I thank ur company,, it definitely feels so much better than before,cuz I was struggling,n juggling my old key to keep it together,,I had tape on it,etc..n I…
CT Security LocksmithsThe gentlemen that work at this establishment are LIFE-SAVERS I repeat Life SAVERS!! Driving from NJ I lost my key on Halloween 🎃 Night IN CT. They responded fast and acted quick. The depth & degree of professionalism have exemplified extreme respect for all customers they treat you with high regard as their…
CT Security LocksmithsI would recommend this service to anyone needing lock work. They were very flexible in service availability, responsive when I reached out via email and phone and the technician was on time for our appointment. The technician was polite and he was very helpful in educating me on options that I was unaware of as it pertained to changing locks vs re-keying.
Overall ratings
Experts Score 0–100Experts Score (0–100)Absolute quality first: recency-weighted star average (≈54%), share of 1–2★ reviews (≈24%), customers’ price verdicts (≈14%), owner replies to critical reviews (≈7%); minus up to 10 points each for complaints flagged in Google review highlights and for a real slide in recent ratings. Hover a company’s score on its page for the full breakdown. and a letter grade per factor (A = top 20% of security system installers).
| # | Company | ScoreExperts Score (0–100)Absolute quality first: recency-weighted star average (≈54%), share of 1–2★ reviews (≈24%), customers’ price verdicts (≈14%), owner replies to critical reviews (≈7%); minus up to 10 points each for complaints flagged in Google review highlights and for a real slide in recent ratings. Hover a company’s score on its page for the full breakdown. | FactorsFactor grades, in orderSatisfaction (54%): Recency-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.Reliability (24%): How 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.Craft & service (0%): Google 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.Value (14%): Customers’ own price verdicts (Great / Reasonable vs Overpriced) and Value highlights; 65% absolute (all “reasonable” ≈ 80, “great” = 100), the category percentile can only raise it.Momentum (0%): Penalises 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.Replies to reviews (7%): How 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.One letter per factor score: A = 80+, B = 60–79, C = 40–59, D = 20–39, F = below 20. | ★Google star rating as shown on Google Maps. | Typical billMedian bill customers of this company reported in their reviews (needs 3+ priced reviews). |
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| 1 |  Advanced CCTV Alarm SystemsNew Haven, CT | A 98How 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 69%99+68.5Reliability 31%97+29.8Experts Score= 98Not enough data for value, replies to reviews; its weight is shared by the others.Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | AA––A– | 5.00 | — |
| 2 |  Ursa Security & ControlNew Haven, CT | A 98How 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 59%99+58.1Reliability 26%96+25Value 15%100+15.2Craft & service penalty99−0.1Experts Score= 98Not enough data for replies to reviews; its weight is shared by the others.Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | AAAAA– | 5.00 | — |
| 3 |  Lynx Systems LLCNew Haven, CT | A 95How 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 59%96+56.3Reliability 26%95+24.8Value 15%95+14.5Craft & service penalty99−0.1Experts Score= 95Not enough data for replies to reviews; its weight is shared by the others.Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | AAAAA– | 4.96 | — |
| 4 |  ATP AlarmsNew Haven, CT | A 89How 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 64%92+58.4Reliability 28%87+24.6Replies to reviews 8%78+6.4Experts Score= 89Not enough data for value; its weight is shared by the others.Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | AA––AB | 4.91 | — |
| 5 | CT Security LocksmithsNew Haven, CT | A 83How 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%83+45.3Reliability 24%72+17.5Value 14%100+14.1Replies to reviews 7%84+5.9Experts Score= 83Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | ABAAAA | 4.90 | $153 |
| 6 |  Mammoth Security Inc. New BritainNew Haven, CT | A 83How 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%82+44.7Reliability 24%78+18.9Value 14%94+13.3Replies to reviews 7%91+6.4Craft & service penalty98−0.2Experts Score= 83Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | ABAAAA | 4.77 | — |
| 7 |  Automotive Specialty Systems LLCNew Haven, CT | A 82How 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 64%88+55.9Reliability 28%80+22.6Replies to reviews 8%91+7.5Momentum penalty58−4.2Experts Score= 82Not enough data for value; its weight is shared by the others.Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | AA––CA | 4.92 | — |
| 8 |  Prosegur Security USA – Shelton OfficeNew Haven, CT | A 82How 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 64%83+52.7Reliability 28%90+25.4Replies to reviews 8%79+6.5Momentum penalty69−3.1Experts Score= 82Not enough data for value; its weight is shared by the others.Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | AA––BB | 4.85 | — |
| 9 |  Property Protection Consulting LLCNew Haven, CT | B 79How 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 64%84+53.4Reliability 28%77+21.7Replies to reviews 8%83+6.8Momentum penalty72−2.8Experts Score= 79Not enough data for value; its weight is shared by the others.Grade B: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | AB––BA | 4.86 | — |
| 10 |  Sterling Security Systems IncNew Haven, CT | B 72How 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 64%80+50.8Reliability 28%70+19.8Replies to reviews 8%32+2.6Momentum penalty85−1.5Experts Score= 72Not enough data for value; its weight is shared by the others.Grade B: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | AB––AD | 4.74 | — |
What jobs cost
What customers paid, from the price Google asks reviewers to report.
| Job | Low25th percentile: 1 in 4 customers paid less than this. | TypicalMedian of the bill customers reported in their Google review (Google asks reviewers for a price range; we use the middle of each range). | High75th percentile: 1 in 4 customers paid more than this. | FairOf customers who rated the price, the share who chose “Great price” or “Reasonable” rather than “Overpriced”. |
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Security System Installers in Connecticut at a glance
How the 10 security system installers we rated in Connecticut compare, and what customers praise most.
Experts Score grades
A = score 80+, F = below 20.
- Grade A880%
- Grade B220%
- Grade C00%
- Grade D00%
- Grade F00%
Google ratings
Average stars per company.
- 4.90★ and up660%
- 4.80–4.89★220%
- 4.60–4.79★220%
- Below 4.60★00%
What customers praise
Share of Google review highlights.
- Quality63420%
- Professionalism70923%
- Responsiveness62420%
- Punctuality57018%
- Value56018%
Was the price fair?
All price verdicts left with reviews.
- Great price28756%
- Reasonable20941%
- Overpriced20%
- Not sure163%
Price verdicts by year
Share calling it great / reasonable / overpriced.
How we grade
Satisfaction (54%) — Recency-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.
Reliability (24%) — How 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.
Craft & service (penalty, up to −10) — Google 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.
Value (14%) — Customers’ own price verdicts (Great / Reasonable vs Overpriced) and Value highlights; 65% absolute (all “reasonable” ≈ 80, “great” = 100), the category percentile can only raise it.
Momentum (penalty, up to −10) — Penalises 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.
Replies to reviews (7%) — How 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.