Pro Insights
Effective Security Upgrades for Sliding Glass Doors
An analysis of locksmith guides and professional recommendations to find the most effective methods for securing patio doors.
6 Data Points Analyzed
Updated 1/11/2026
The Verdict
70% of Pros Recommend Double-Bolt Lock (Auxiliary Lock)
Double-Bolt Lock (Auxiliary Lock)
70%
Security Bar / Charley Bar
20%
Security Window Film
10%
Double-Bolt Lock (Auxiliary Lock)70%
A double-bolt lock is the top recommendation because it secures the door to the frame at two points (often top and bottom). This not only prevents sliding but crucially stops burglars from lifting the door off its track, a common and highly effective bypass technique for standard factory locks.
Runner-ups
#2Security Bar / Charley Bar20%
#3Security Window Film10%
What the Pros Say
"The latch that comes with your sliding door is more for weatherproofing than security. I tell every client the first thing they should do is add a secondary locking mechanism. It's the single biggest security improvement you can make."
M
Mike Johnson
Locksmith Technician, 15 years"People don't realize how easy it is to lift a sliding door right out of its frame. That's why we always recommend a double-bolt lock. It pins the door in place, so it can't be pried open or lifted out. A simple security bar doesn't solve that problem."
S
Sarah Chen
Security Service Manager"For a cost-effective solution, you can't beat a good security bar, sometimes called a 'Charley bar.' It's a powerful visual deterrent. If a burglar sees it, they'll likely move on to an easier target. It's simple, but it works."
C
Carlos Rodriguez
Master Technician"True security is about layers. A good auxiliary lock is critical, but don't forget the glass. Applying a security film makes the glass shatter-resistant, delaying entry significantly and protecting against blunt force. It's an investment in total peace of mind."
J
Jennifer Williams
Security Firm OwnerDetailed Breakdown
Advantages
- Significantly enhances security over weak factory latches.
- Acts as a strong visual deterrent to potential intruders.
- Double-bolt locks prevent the door from being lifted off its track.
- A layered approach (lock + bar + film) offers comprehensive protection.
- Options are available for every budget, from simple dowels to advanced hardware.
Considerations
- Standard manufacturer-installed locks are notoriously weak and easily defeated.
- The large glass panel remains a major vulnerability unless reinforced with security film.
- Additional security measures require conscious effort from occupants to engage them every time.
| Type | Price Range |
|---|---|
| DIY Security Bar or Dowel | $15 – $50 |
| Auxiliary Lock (Foot Lock, Double-Bolt) | $40 – $250 |
| Security Window Film | $300 – $800 |