The Best Security Guard Services
We graded 36 companies on seven things customers actually report: satisfaction, reliability, workmanship, value, momentum, track record and how owners handle complaints.
From 7,389 Google reviews of 36 top-rated security guard services nationwide. Updated November 2, 2026.
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Best security guard services for lock rekeying
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Foster Brothers Security SystemsHow Job match is calculatedBuilt only from reviews Google tagged “Lock rekeying”:Stars on this job 55%5.00★Number of such jobs 25%14Overall Experts Score 20%88Job match= 94Stars are pulled toward the category average (4.89★) 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.94Job match = this company’s ★ on reviews Google tagged “Lock rekeying” (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 lock rekeying
Foster Brothers Security SystemsWe are a commercial lock, door, and safe company. We have National accounts and Foster Brothers Security Systems is our go-to company for our South SF Bay Area markets. Fast service. Always had the time and part. Been working with this company for years. Thank you!!!
I called him out for two separate services once to rekey my house and once to get new keys for both my cars. He was super nice and professional. He came after the kids were put to bed for the night and he made sure he was super quite the whole time to not wake them up. I will always recommend him for any locksmith needs.
Foster Brothers Security SystemsI just used Foster Brothers for rekeying my condo. It is a tricky job because the key also has to work on a number of other locks within the condominium. And they did a great meticulous job. They gave me a quote and that is exactly what they charged. Quite a professional firm.
Foster Brothers Security SystemsI use them at multiple commercial building sites. They respond promptly and show up as scheduled. The entire staff has tremendous knowledge to complete any service request. I routinely recommend this Locksmith.
Foster Brothers Security SystemsGreat service from Foster Brothers. Quick Response, professional and every Tech they send over do a great job. Thank you so much
Foster Brothers Security SystemsThree generations of my family have sought out Foster Brothers Security Systems, Inc. when they needed a locksmith. It is a first-class operation. As a local Realtor®, I recommend Foster Brothers whenever possible. Twice this year, both personally and professionally, Foster Brothers exceeded all expectations. Mike…
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 guard services).
| # | 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 |  Security Compliance AcademyHolly Springs, NC | A 100How 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%100+69.2Reliability 31%100+30.8Experts Score= 100Not 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 |  Security Training CenterCountry Club Hills, IL | 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 55%98+53.5Reliability 24%97+23.5Value 14%97+13.7Replies to reviews 7%100+7.1Experts Score= 98Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | AAAAAA | 4.95 | — |
| 3 |  VP Security GuardsSanta Clara, CA | 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 | — |
| 4 |  Black Eagle Fire & Security, Inc.Santa Clara, CA | 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 | — |
| 5 |  Global Risk Solutions, Inc.Santa Clara, CA | 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 | — |
| 6 |  Proud Security Guards, Inc.Santa Clara, CA | 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%98+67.8Reliability 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 | — |
| 7 |  E'CLAT Security Group, PLLC.Markham, IL | A 97How 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%97+67.2Reliability 31%98+30.2Experts Score= 97Not 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– | 4.98 | — |
| 8 |  Security Tactics AcademyStafford, TX | A 97How 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%96+61Reliability 28%98+27.7Replies to reviews 8%100+8.2Experts Score= 97Not 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––AA | 4.95 | — |
| 9 |  HBT Security Group Inc.Country Club Hills, IL | A 96How 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%96+66.5Reliability 31%96+29.5Experts Score= 96Not 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– | 4.96 | — |
| 10 |  Alert Security & PatrolSanta Clara, CA | A 96How 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%98+57.5Reliability 26%97+25.3Value 15%87+13.2Experts Score= 96Not 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. | AAAA–– | 5.00 | — |
| 11 |  Elwin SecuritySanta Clara, CA | A 96How 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%98+57.5Reliability 26%97+25.3Value 15%85+12.9Experts Score= 96Not 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. | AA–AA– | 5.00 | — |
| 12 |  American Guards SecurityStafford, TX | A 94How 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%94+59.7Reliability 28%92+26Replies to reviews 8%100+8.2Experts Score= 94Not 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––AA | 4.88 | — |
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 Guard Services at a glance
How the 36 security guard services we rated compare, and what customers praise most.
Experts Score grades
A = score 80+, F = below 20.
- Grade A2775%
- Grade B514%
- Grade C411%
- Grade D00%
- Grade F00%
Google ratings
Average stars per company.
- 4.90★ and up1747%
- 4.80–4.89★1336%
- 4.60–4.79★514%
- Below 4.60★13%
What customers praise
Share of Google review highlights.
- Quality13621%
- Professionalism20130%
- Responsiveness14522%
- Punctuality7311%
- Value10716%
Was the price fair?
All price verdicts left with reviews.
- Great price2846%
- Reasonable3252%
- Overpriced12%
- Not sure00%
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.