iHow 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%88+48Reliability 24%90+21.8Value 14%100+14.1Replies to reviews 7%53+3.7Experts Score= 88Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews.88SCORE
AGradeiLetter from the Experts Score: A = 80+, B = 60–79, C = 40–59, D = 20–39, F = under 20.
#19 of 36 security guard servicesiPosition by Experts Score among all companies we track in this category. · better than 49%
4.8★★★★★182 Google reviews · 24 photos
91%five-star reviews
4.96★last 12 monthsiAverage stars on reviews from the last 12 months only.
0%1–2★ in 2 yearsiShare of 1–2★ reviews in the last 24 months — or the 20 newest reviews when the company had fewer than 20 in that time.
55%reviews answered by the owner
$105typical billiMedian bill customers of this company reported in their reviews (needs 3+ priced reviews).
Google reviewers rate Foster Brothers Security Systems 4.8 out of 5 based on 182 reviews, with the owner responding to 55% of them. Customers frequently praise the company for punctuality, knowledgeable staff, competitive pricing, and efficient service for tasks like key duplication, rekeying, and lock installation. While most feedback highlights professional communication and quick turnaround times, a few low-star reviews criticize instances where duplicate keys were not cut correctly or programming appointments were delayed beyond the promised timeframe.
Google rating: 4.8 out of 5 from 182 reviews (91% five-star).
Reviews on this page: 182 Google reviews (139 with written comments, 3 with photos).
Owner responses: the business replied to 55% of reviews.
Most recent review: October 24, 2026.
Service: Security Guard Company serving Santa Clara, California.
Data from Google, last updated October 26, 2026.
Score profile vs other security guard services
Score per factor (100 = best)iEach 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: value and momentum; weakest: replies to reviews.
This companySecurity Guard Services median0 = centre, 100 = best
SatisfactioniSatisfaction · 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.Foster Brothers Security Systems: 88/100 on this factor. Category median: 89.A
88
ReliabilityiReliability · 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.Foster Brothers Security Systems: 90/100 on this factor. Category median: 89.A
90
Craft & serviceiCraft & 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.Not enough reviews for this factor yet. Category median: 100.–
–
ValueiValue · 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.Foster Brothers Security Systems: 100/100 on this factor. Category median: 90.A
100
MomentumiMomentum · 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.Foster Brothers Security Systems: 100/100 on this factor. Category median: 100.A
100
Replies to reviewsiReplies 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.Foster Brothers Security Systems: 53/100 on this factor. Category median: 79.C
53
Bar = this company · dark tick = category median.
Star ratings
182 Google reviews we collected
4.8of 5
5 stars16691%
4 stars105%
3 stars00%
2 stars32%
1 star32%
Praise vs complaints
Phrases our text analysis found in 139 written reviews
98%praise
Praise18298%
Complaints42%
PriceiGoogle asks reviewers whether the price was great, reasonable or overpriced; these are their answers.
Price verdicts customers left with their Google review
100%fair
Great price1362%
Reasonable838%
Overpriced00%
Not sure00%
$105-28% vs typical security guard services
Middle half of what 11 customers paid ($8–$222) · gold mark = category median.
Topic share
How often each topic comes up in the written reviews
7topics
Speed & response5328%
Staff & attitude4424%
Quality & results3217%
Would recommend2011%
Price & value1910%
Honesty & trust105%
Communication84%
What customers talk about
We read 139 written reviews and marked every phrase about these topics. The same colors are highlighted in the reviews.
“Their locksmith Chris did a fantastic job, was on time & went over the finished job.”
“A+ service, Jeff in dispatch is easy to work with and always knowledgeable.”
“…so called Foster Brothers and they had a guy there pronto, he did an awesome job getting in, also he had the part for the lock in his van install ins…”
“Duplicate key is not working.”
“We have National accounts and Foster Brothers Security Systems is our go-to company for our South SF Bay Area markets.”
“The service was super fast for high quality duplicate keys for a great price.”
“Super friendly folks who are extremely reliable and not trying to gouge you for money.”
“…needed keys or a new lock, and after I hauled it in the staff quickly walked me through a series of potential outcomes, and that was it.…”
praise complaint · found by our text analysis, Google review wording unchanged.
Reviews for your job
Customers hired Foster Brothers Security Systems for 8 kinds of job. Pick one to see what they paid and said.
JoyLocal Guide · 19 reviewsiTotal 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. · Edited 6 days ago★★★★★
Duplicated a key for our unusual Australian car with no problems. Other places wouldn't go near it. Thank you Mike!!
Paid $1–20Great priceCar key copying
Serena4 reviewsiTotal 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. · 3 months ago★★★★★
Super fast turnaround time and high quality. They charge less than stupid key-copying machine, who made a key copy that doesn’t work and I have no where to complain about… Foster brother did me a favor to fix the non-functional key copy made by machine earlier. Highly recommend this store!
Paid $1–20Great priceStandard key copying
KenLocal Guide · 20 reviewsiTotal 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. · 4 months ago★★★★★
I 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.
Paid $200+Great priceLock rekeying
Melissa2 reviewsiTotal 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★★★★★
I 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.
Andy5 reviewsiTotal 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★★★★★
I had a 90+ lb (40+ kg) tool chest that needed keys or a new lock, and after I hauled it in the staff quickly walked me through a series of potential outcomes, and that was it.
A few days later the lock was drilled out, and I can now access the contents and use the chest (albeit for now without a lock) for storage.
Paid $20–40Reasonable price
Jennifer1 reviewiTotal 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★★★★★
Foster Bros re-keyed and replaced an old non-working lock. They responded promptly and did the job quickly, leaving the lock working perfectly. Best of all, they are friendly and personable, always cheerful as well as highly efficient.
We 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!!!
Price assessment: Great price
Services: Building lockouts, Safe lock install, open & repair, Lock rekeying, Coded key copying, Door lock & bolt hardware repair, Installation, Security door locks, Standard key copying, Electronic lock installation, Building key copying, General repairs, Repair hardware, Door lock & bolt hardware installation
Response from the owner · Edited 2 days ago
Robert , thank you so much for your review and 5 star rating! We're honored to have served your security needs.
We take pride in our customer service and are always happy to hear when we've exceeded expectations.
Joy JoynerLocal Guide · 19 reviewsiTotal number of Google reviews Joy has written across all businesses on Google Maps, not just this one.
Duplicated a key for our unusual Australian car with no problems. Other places wouldn't go near it. Thank you Mike!!
Price assessment: Great price
Price: $1–20
Services: Car key copying
Response from the owner · Edited 6 days ago
Thanks for the feedback Joy , it's always great to hear from our customers. I'm happy you find us reliable and that we're able to help with your security needs. I'll be sure to pass along your comments along to our team!
Kang ZauLocal Guide · 64 reviewsiTotal number of Google reviews Kang has written across all businesses on Google Maps, not just this one.
Robots can give you (hopefully working) keys but they don't remind you to lub your exterior locks and not to use wd forty as lub ('cayse it ain't lub). Nice shop, vast knowledge base, priceless!
Response from the owner · 2 weeks ago
Thank you for your review, Kang . We're happy to hear that our service is meeting your needs!
Gerard Casey5 reviewsiTotal number of Google reviews Gerard has written across all businesses on Google Maps, not just this one.
I’ve had duplicate keys made for me @ their shop & home service to replace a very old deadbolt & keyed entry. Their locksmith Chris did a fantastic job, was on time & went over the finished job. Highly recommend !!
Price assessment: Reasonable price
Services: Installation
Response from the owner · a month ago
Thank you for your kind words, Gerard . I'm glad to hear that we've been able to provide the quality service you deserve.
I'll make sure this review is passed on to our team and they can continue providing the excellent customer service that has made Foster Brothers a trusted name in locksmithing.
Aim4awesome7 reviewsiTotal number of Google reviews Aim4awesome has written across all businesses on Google Maps, not just this one.
A+ service, Jeff in dispatch is easy to work with and always knowledgeable. They respond quickly to emails and their techs are all great.
Response from the owner · Edited a month ago
Hi Aim4awesome , thanks for the review! I'm glad to hear you're satisfied with the quality of our services. We take pride in what we do and want to make sure we deliver on your expectations every time. I'll be sure to pass this feedback onto my team here at Foster Brothers Security Systems so that they know how much you care about us.
Amit RajgarhiaLocal Guide · 38 reviewsiTotal number of Google reviews Amit has written across all businesses on Google Maps, not just this one.
Always always amazing service. Jim / Jeff / Nery / Jacob, anyone I interact with are very professional and efficient not to mention knowledgeable on their field. Keep it up and thank you for your services. Amit
Response from the owner · 2 months ago
Thank you for your review Amit , we're so glad to hear that Foster Brothers has been able to help you out.
We pride ourselves on being the best and it's great to know that our customer service is living up to expectations! I'll make sure your feedback is passed along to our team here.
Denise TsangLocal Guide · 35 reviewsiTotal number of Google reviews Denise has written across all businesses on Google Maps, not just this one.
I had 3 copies made for a file cabinet. The service was super fast for high quality duplicate keys for a great price. I also conveniently picked up some accessories for the keys. Fantastic customer service and they are VERY knowledgeable and gave excellent advice. All the keys worked perfectly! Highly recommend Foster Brothers!
Price assessment: Great price
Services: Standard key copying
Response from the owner · 2 months ago
Denise , thank you so much for your review and 5 star rating! We're honored to have served your security needs.
We take pride in our customer service and are always happy to hear when we've exceeded expectations.
Dave O'MaraLocal Guide · 15 reviewsiTotal number of Google reviews Dave has written across all businesses on Google Maps, not just this one.
Got locked out of a listing (Work with The Dave Keefe Real Estate Team as Listing Manager) & I had stagers and Furniture Delivery guys showing up, so called Foster Brothers and they had a guy there pronto, he did an awesome job getting in, also he had the part for the lock in his van install installed it in less than 30 minutes for everything.
Excellent service 👍
Price assessment: Reasonable price
Services: Installation, Door lock & bolt hardware installation
Response from the owner · 3 months ago
Thanks for the feedback Dave , it's always great to hear from our customers. I'm happy you find us reliable and that we're able to help with your security needs. I'll be sure to pass along your comments along to our team!
Serena Siyang Dong4 reviewsiTotal number of Google reviews Serena has written across all businesses on Google Maps, not just this one.
Super fast turnaround time and high quality. They charge less than stupid key-copying machine, who made a key copy that doesn’t work and I have no where to complain about… Foster brother did me a favor to fix the non-functional key copy made by machine earlier. Highly recommend this store!
Price assessment: Great price
Price: $1–20
Services: Standard key copying
Response from the owner · 3 months ago
Thank you for your review, Serena . We're happy to hear that our service is meeting your needs!
Marvin3 reviewsiTotal number of Google reviews Marvin has written across all businesses on Google Maps, not just this one.
Jason is consistently punctual and takes pride in producing high quality work.
Services: Lock rekeying
Response from the owner · 3 months ago
Thank you for your kind words, Marvin . I'm glad to hear that we've been able to provide the quality service you deserve.
I'll make sure this review is passed on to our team and they can continue providing the excellent customer service that has made Foster Brothers a trusted name in locksmithing.
