to top 10 table

10 Best Window Locks Reviewed for a Safer Home in 2019

last updated Mar 03, 2019

Window locks can prevent windows from being opened by intruders, and they can help you in airing out a room without opening the window all the way. This way you get air in the room, but the window pane cannot be opened any further by anyone not having access to the inside lock. We feature in this informative buying guide the best-rated and most-reviewed window locks judged by online customers. Manufacturers have created these excellent locks to safeguard your home, make the windows childproof, and keep them closed as desired. We are delighted to spotlight these outstanding locks for you to enhance the safety of your home. Here are the best window locks in 2019.

In a Hurry? The test winner after 15 hrs of research

icon
Zeltauto Adjustable Sliding 2 Set
93.3/100 our score
Ease of Use
95
Effectiveness
90
Price Range
95
Zeltauto Adjustable Sliding 2 Set
Why is it better?

Made of strong aluminum alloy material

The key determines the thickness it is set to

Comes with a wrench for the narrow track

Made for vertical and horizontal sash windows

Are adjustable, removable, and simple to install

In a Hurry? Editors choice:
Zeltauto Adjustable Sliding 2 Set
Test Winner: Zeltauto Adjustable Sliding 2 Set
Amazon Link
Researched Sources
16
Researched Sources
Hours Researching
15
Hours Researching
Products Evaluated
10
Products Evaluated
Sorting Options
Ease of Use Effectiveness Price Range By Default
Rank
PictureProduct
Name
Rating
Shops
#1
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
93.3
Ease of Use
95%
Effectiveness
90%
Price Range
95%
Price Comparison Last Updated (21.07.19)
Amazon Link
$7.78
#2
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
92.3
Ease of Use
90%
Effectiveness
95%
Price Range
92%
Price Comparison Last Updated (21.07.19)
Amazon Link
$11.99
#3
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
92.3
Ease of Use
90%
Effectiveness
92%
Price Range
95%
Price Comparison Last Updated (21.07.19)
Amazon Link
$6.57
#4
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
91.7
Ease of Use
90%
Effectiveness
95%
Price Range
90%
Price Comparison Last Updated (21.07.19)
Amazon Link
$16.98
#5
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
90
Ease of Use
85%
Effectiveness
90%
Price Range
95%
Price Comparison Last Updated (21.07.19)
Amazon Link
$4.68
#6
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
90
Ease of Use
95%
Effectiveness
90%
Price Range
85%
Price Comparison Last Updated (21.07.19)
Amazon Link
$12.95
#7
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
89
Ease of Use
90%
Effectiveness
85%
Price Range
92%
Price Comparison Last Updated (21.07.19)
Amazon Link
$10.00
#8
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
88.3
Ease of Use
90%
Effectiveness
95%
Price Range
80%
Price Comparison Last Updated (21.07.19)
Amazon Link
$11.99
#9
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
87.3
Ease of Use
90%
Effectiveness
92%
Price Range
80%
Price Comparison Last Updated (21.07.19)
Amazon Link
$13.99
#10
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
85
Ease of Use
90%
Effectiveness
85%
Price Range
80%
Price Comparison Last Updated (21.07.19)
Amazon Link
$15.98
In Depth Review Top 10
  • Zeltauto Adjustable Sliding 2 Set
  • Maxdot 4 Sets Sliding
  • Defender Security U 9809 Sliding
  • Windowbully Adjustable 2pk
  • Prime-Line F 2744 Sash
  • Safety Innovations 4-Pack
  • Sure Basics Sliding Clear 4-Pack
  • Safetynex 3M Adhesive 4 Pack
  • Boao Set of 15 Siding
  • Lion Locks Aluminum Sliding
Table of contents
  • Criteria Used for Evaluation
  • Other Factors to Consider
  • Frequently Asked Questions
  • Sources

10 Best Window Locks

1. Zeltauto Adjustable Sliding 2 Set

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
93.3
Zeltauto Adjustable Sliding 2 Set
Amazon Link
Ease of Use
95
Effectiveness
90
Price Range
95
best offer for today
Amazon Link
$7.78

Made of strong aluminum alloy material

The key determines the thickness it is set to

Comes with a wrench for the narrow track

Made for vertical and horizontal sash windows

Are adjustable, removable, and simple to install

Might be smaller than expected

Did not fit for some windows

The Zeltauto Adjustable Sliding Window Locks Set is a set of two locks with keys for both that are sturdy and durable. Made of strong aluminum alloy material, they are made for vertical and horizontal sash windows. The key determines the thickness it is set to, and you can use both locks on the same window for extra security.

Read more

Ease of Use

This fantastic set comes with a wrench to put the lock on the narrow track of a window. These are adjustable, removable, and simple to install. You can use these wonderful locks on windows or doors that are vertical or horizontal. They can easily be placed all over your house making it safe and secure against burglars and to keep kids safe.

Effectiveness

They can be used to keep the window open partially, for child safety, for preventing burglar entry, or for increased air circulation.

Price Range

This ideal set of locks for windows has a below-average cost. It is valued for its strong materials, the keys and wrench are included, and is easy to install.

2. Maxdot 4 Sets Sliding

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
92.3
Maxdot 4 Sets Sliding
Amazon Link
Ease of Use
90
Effectiveness
95
Price Range
92
best offer for today
Amazon Link
$11.99

No tools or hardware are required

Comes with a hex key for each lock

Made of durable aluminum and steel

Use for keeping windows closed or open

Prevents kids from falling out of windows

Keys were too big for some window spaces

Locks were too small for a few types of windows

This package of Maxdot Sliding Window Locks contains four locks in the set that are simple to install and require no tools or hardware to put in place. The fabulous set comes with a hex key for each lock and can be used over and over again.

Read more

Ease of Use

It could not be any easier than this to put in window locks to childproof your home. These terrific locks are just placed over the window track and tightened in place for security. Even if you move to another home or location, you can take these locks with you and use them over and over again. They are long-lasting and durable for years and years of great use.

Effectiveness

Made of durable aluminum alloy and stainless steel, use these fantastic locks for keeping windows closed or partially open. They will prevent kids from falling out of windows, plus you can use more than one lock for large or heavy windows that need protection.

Price Range

Having an average price, these wonderful window locks are valued for their strong construction, easy and quick installation, and large keys for each lock in the four-pack.

3. Defender Security U 9809 Sliding

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
92.3
Defender Security U 9809 Sliding
Amazon Link
Ease of Use
90
Effectiveness
92
Price Range
95
best offer for today
Amazon Link
$6.57

Has a vise-like grip that holds tightly

Will not damage the window frames

Locking lever is cam-style

No tools are necessary for installing

Has an adjustable jaw

Did not grip well to the track for a few people

Some buyers were able to move these after they were placed

This fabulous product is a set of two locks to this pack that will not damage window frames. The Defender Security Sliding Window Locks for Vinyl Windows are locks for sliding windows. They have a vise-like grip that holds tightly and securely with an adjustable jaw.

Read more

Ease of Use

The locking lever is cam-style, no tools are necessary for installing, and they are intended only for vinyl windows. These simple locks can be installed, used, and removed very easily. They are also adjustable, so you can get the fit you want and put them exactly where you think they should go.

Effectiveness

These excellent locks keep windows shut to deter intruders or keep kids inside and safe. They can also be used to open the window a bit for added air in a room but just to the width of the lock. This great set includes a diecast construction and a painted finish of white.

Price Range

This superb set of locks has a below-average price. They have the great qualities of having a tight vice-like grip, having several purposes, and for not needing tools to put them on.

4. Windowbully Adjustable 2pk

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
91.7
Windowbully Adjustable 2pk
Amazon Link
Ease of Use
90
Effectiveness
95
Price Range
90
best offer for today
Amazon Link
$16.98

Made of strong durable stainless steel

No tools are necessary and install quickly

Tested for break-in force of up to 300 pounds

Can be set for partially opened, locked, or fully opened

Will fit most sliding doors or windows

May rust easily and within a few months

Did not work well for some buyers

The Windowbully Window Lock Set is a two-pack of strong window locks that install quickly and easily. They have a white color to blend in with most room décor and are made of sturdy durable stainless steel.

Read more

Ease of Use

No tools are necessary for installing, and they are tested for break-in force of up to 300 pounds. They are universal in that they will fit most regular sliding doors or windows very well.

Effectiveness

This terrific set of locks includes three settings of partially opened, locked, or fully opened. Use them to aerate a room and keep the window closed most of the way, to keep out burglars, or to keep children from gaining access to the window. These incredible locks were tested for break-in strength. They will hold in place with a force of up to 300 pounds trying to open the windows with them in place. That is quite strong for such a small lock.

Price Range

These locks are the most expensive item we feature on this page. They are valued for their versatility in blending in with the room, being tested for strength, and having several settings for being open or closed.

5. Prime-Line F 2744 Sash

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
90
Prime-Line F 2744 Sash
Amazon Link
Ease of Use
85
Effectiveness
90
Price Range
95
best offer for today
Amazon Link
$4.68

Use on double or single hung windows

Perfect for sliding vertical windows

Works on windows of vinyl or wood

Used by manufacturers of windows

Includes installation fasteners

May not pull the windows taut against the window sill

Some buyers said the metal is thin

The Prime-Line Sash Lock can be placed on double or single hung windows and is easy to install. Perfect for sliding vertical windows made of vinyl or wood materials, it is a sash-style lock that is durable and long-lasting.

Read more

Ease of Use

It has a white enamel powder-coat finish with a die-cast construction and comes with the necessary installation fasteners to put it in.

Effectiveness

This model of sash lock is used by many manufacturers of windows because it is a strong and easy lock to use for this type of window.

Price Range

This fabulous item has the lowest cost of all the items listed because it is for only one lock. It has the great qualities of being easy to put in place, coming with the fasteners for installing, and being flexible for double or single windows.

6. Safety Innovations 4-Pack

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
90
Safety Innovations 4-Pack
Amazon Link
Ease of Use
95
Effectiveness
90
Price Range
85
best offer for today
Amazon Link
$12.95

No tools or hardware required

Is clear in color to be less noticeable

Will mount easily to mirror and glass

Releases and locks with an easy motion

Aids in preventing kids from falling out

May pop off easily with a strong force

Some people said that these unlock easily

This Window and Door Baby Proof Safety Lock Set is a four-pack of locks used for sliding doors or windows. No tools or hardware are required because they use a strong industrial-strength adhesive for attaching.

Read more

Ease of Use

Made of durable polycarbonate that is super-strong, they are clear in color to be less noticeable by kids. They will mount easily to mirror and glass surfaces, plus release and lock with an easy sliding motion. An industrial-strength adhesive is used to attach these durable locks to the mirror or glass surfaces. It is not the 3M adhesive that is usually used on such locks, so it is much stronger.

Effectiveness

This incredible lock set aids in keeping windows locked to prevent kids from falling out. Put two locks on each window for the most safety and security.

Price Range

With an above-average cost, this set of window locks require no tools or hardware to install them, will mount on mirror or glass, and is made of a strong durable plastic material.

7. Sure Basics Sliding Clear 4-Pack

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
89
Sure Basics Sliding Clear 4-Pack
Amazon Link
Ease of Use
90
Effectiveness
85
Price Range
92
best offer for today
Amazon Link
$10.00

Made specifically to childproof areas

Is clear to be less detectable

Will match colors or styles any place

Works on mirrors, glass, or wood surfaces

Remove without damaging surfaces

Jammed for a few buyers

Did not work well said some people

Used for windows, doors, or closets, these Clear Sliding Window Locks come in a four-pack and are made specifically to childproof areas of the home. Simple to install, they do not require hardware or tools to put in place because they attach with a durable 3M adhesive.

Read more

Ease of Use

Installing in just minutes, they are clear to be less detectable and will match colors or styles any place they are placed. Pull the lever to lock them and lift to unlock.

Effectiveness

These great locks work on many surfaces including glass, wood, and mirrors. You can place them anywhere you need to secure the area shut or slightly open for extra air.

Price Range

This set of window locks has a below-average cost. they are valued for their clear color, installation without tools or hardware, and ability to work on both windows and doors.

8. Safetynex 3M Adhesive 4 Pack

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
88.3
Safetynex 3M Adhesive 4 Pack
Amazon Link
Ease of Use
90
Effectiveness
95
Price Range
80
best offer for today
Amazon Link
$11.99

No drilling or tools needed

Uses strong 3M adhesive for attaching

Can stop or limit access to the widow

Can be manipulated with one hand by an adult

Will adhere to many surface types

These broke in use for some buyers

Might have sharp edges to catch on things

Used for windows, doors, or closets, the 3M Adhesive Sliding Door Lock for Windows uses strong 3M adhesive for attaching. No drilling or tools is needed, and they can be manipulated with one hand by an adult easily.

Read more

Ease of Use

You can place these incredible locks on almost any door or window. They will work on all types of surfaces well because of the strong attachment of the 3M backing they have. This is a four-pack of locks that are easy to take off and reapply as needed.

Effectiveness

These fantastic locks can stop or limit access to the widow and are perfect for childproofing a home. Made of durable ABS plastic. They will adhere to all surfaces of plastic, wood, aluminum, and glass. Whether you want to prevent a window from being opened or limit the access to one, these locks will do the trick. You can open the window just a bit to get air in the room or shut it tight completely.

Price Range

Having an average cost, this four-pack of great window locks derives its value from not needing tools to install, being flexible for placement on windows and doors, and for being attachable to many types of surfaces.

9. Boao Set of 15 Siding

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
87.3
 Boao Set of 15 Siding
Amazon Link
Ease of Use
90
Effectiveness
92
Price Range
80
best offer for today
Amazon Link
$13.99

Are adjustable and silver in color

No tools are needed for installing

Rust-proof, long-lasting, and durable

Will fit most horizontal or vertical windows

Are weighty and sturdy

Did not fit well for a few buyers

Some people had to put more than one on a window

This is a terrific set of fifteen locks for windows that are adjustable and silver in color. The Boao Sliding Window Locks come with keys, no tools are needed for installing, and they are made of aluminum alloy.

Read more

Ease of Use

If you want added security for your windows, then you can double up on these locks. Larger windows may require more than one lock to ensure that no one can open them.

Effectiveness

Rust-proof, long-lasting, and durable, they will fit most horizontal or vertical sliding doors and windows. Use them for keeping a window partially closed or open, keeping kids safe, preventing entry to burglars, or enhancing the circulation of air in a room. Several locks can be put on one window to increase safety, as they are weighty and sturdy.

Price Range

This set of nice window locks has an above-average cost. It derives its value from being rust-proof and long-lasting, not needing tools to install, and fitting mostly all standard windows.

10. Lion Locks Aluminum Sliding

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
85
Lion Locks Aluminum Sliding
Amazon Link
Ease of Use
90
Effectiveness
85
Price Range
80
best offer for today
Amazon Link
$15.98

Made of heavy-duty durable aluminum

Vinyl prevents damage and scratching

Locks in an open position or a closed one

Includes two thumbscrews on each lock

No tools are required

Did not fit on some buyers’ windows

Might not hold well on windows with a thin sash

This ten-pack of strong sliding window and door locks is constructed of heavy-duty durable aluminum. The Lion Locks Aluminum Sliding Door and Window Locks have an inner lining of vinyl to prevent damage and scratching.

Read more

Ease of Use

No tools are required to put these durable locks on sliding windows or doors. You just have to place them without the thumbscrews where you want them to go and then tighten.

Effectiveness

Most similar locks for windows have only one key or thumbscrew to tighten them on the window. These wonderful locks have two to hold them more securely in place where you want them. They will lock the windows in an open ventilating position or a closed one.

Price Range

With an above-average price, these fabulous locks have the great features of being for windows or doors, having a strong aluminum construction, and including two thumbscrews for each lock.

Criteria Used for Evaluation

Ease of Use

Being that no tools or hardware is required to put these sturdy locks in place, they could not be any easier to put in. Once the locks are in place, the only time you will need to open them is to open the window. If you purchase the locks for security against burglars or to prevent children from opening the windows, then you will probably not be opening them much. To aerate a room, these locks can be released an inch or two to allow in the air but still keep the window from opening any more than that. When you want to remove the locks or open them for temporary releasing, just a turn of the included key will do the trick. The window locks of plastic material that attaches to the window pane can be released and locked again by a simple sliding motion.

Effectiveness

Each of these fantastic locks will keep a child from opening the window they are attached to, provided they fit properly and are the correct size for the window that is needed. It is easy to just buy a lock and not look at the size requirements for it. These measurements are given in the manufacturer’s details of the product and should be followed precisely. If the lock is not the right size, then it will not work properly to safeguard your windows. You will not be able to trust that it will work because it will be either too loose or too tight to work correctly. Again, we want to mention that it is important that children do not see the installation or mechanics of these locks if they are intended to prevent children access. They can learn the process of opening these locks easily.

Price Range

Our individual Cost and Value sections give you an idea of where that product stands as far as cost compared to the other items listed. We take an average of all the prices, which is used for the comparison. You will see that the product will be either average, below-average, or above-average in cost. we do not list specific prices because these often change online. This way with the price descriptions, our information is always correct, even if the prices change a little bit. We also give you the top qualities or features that make the item excellent for the price. The most expensive window locks are the Windowbully Window Lock 2pk, and the one with the lowest cost is the Prime-Line Sash Lock. The prices of these vary with how many locks are in the package, the materials used to make them, and the type of lock that it is.

Most Important Criteria (According to our experts opinion)
Sort criterias acording to:
Experts Opinion Editors Opinion Users Opinion By Default
Click on a to rate the most important criteria:
#1
Ease of Use
Rate This Criteria as Most Important
#2
Effectiveness
Rate This Criteria as Most Important
#3
Price Range
Rate This Criteria as Most Important
Parents Did You Know

Between 1990 and 2008 more than 98,400 children were admitted to the Emergency room due to an injury from a window fall.

Parents Did You Know

Children between the ages of 0-4 have the highest likelihood of falling from a window.

Other Factors to Consider

Durability

The majority of these excellent locks are made of strong steel and metal materials, so they will be usable for many years of locking windows. Several comments online were made of how a few of these models were heavy and substantial. The locks may be small, but they are tough to hold a window tight and secure. The few plastic locks we feature are strong also and will last a long time. These cannot be reused once they are in place on a window because they adhere in place with a strong adhesive. They can be removed, but then new ones will have to be purchased again. the metal locks that fit on the track of the window can be used over and over again for many years.

Frequently Asked Questions

q: Do you need hardware or tools to put these locks on the windows?

a:

No, hardware and tools are not needed to put any of these great locks in place on the windows. They use either a strong adhesive to stick to the window glass, or they have their own hex keys to tighten the lock on the window track.

q: How do these attach to the windows?

a:

The majority of these featured window locks clamp onto the window track by tightening a key as a screw. They will keep the window open a few inches or keep them closed to prevent opening. The plastic locks adhere to the window pane to prevent the sliding part of the window from moving up or across if it is a horizontal window. The ones with the hex keys can be used over and over again, but the ones with the strong adhesive to the window cannot be used again.

q: How do these locks work? Do they all have the same mechanics of operation?

a:

Most of the locks featured here are strong clamp-type locks that are fastened tightly with a hex screw. These will allow the window to be completely shut, or it can be partially opened to aerate a room. There are a few locks listed that simply adhere to the window to keep it from opening. These are made of a strong plastic and are manipulated with a sliding motion to lock and unlock them.

q: Can a child learn to manipulate these by watching an adult or do they need strength to open them?

a:

Children can learn how to use these to their advantage. If they watch you install the locks, then they will surely know how they operate. Some of these can be placed at the top of the windows where kids cannot reach them. Strength is not really needed to release these locks unless you tighten the screws on them really tight. This way children will not be able to manipulate them even if they know how to work them.

q: Are these locks for any type of window?

a:

They are mainly for regular sliding windows and doors. They vary in the type of materials that are around the window such as plastic or wood for some of them, but generally, they will fit most windows.

q: Does the window have to be a certain size or build for these to work properly?

a:

No, these will work on any size of sliding window or door that is made of a glass or mirror surface. The locks do vary with type and style, but the majority of them will work with almost any regular window.

q: What is the most common complaint about these window locks online from customers?

a:

The most complained about feature of these locks, in general, is that they do not fit or do not work on the particular window they were intended for. This is understandable because of the vast number of window types and track sizes that are in use in homes. Some people said these were too big, while others said they were too small. A few comments said that several of the models came off easily and were easy for their kids to remove or open. It is important that the child not be shown how these locks operate because they will then be able to open them themselves. As far as the sizing issue, the sizes and accommodations of the locks are given in the manufacturer’s details of each type. We suggest that you look at those closely before ordering any of these locks. You will save time, aggravation, and money by ensuring that the ones you order are the correct size for the window you want to lock.

Sources

  1. Unknown Author, Window Safety, Online Article
  2. Unknown Author, 5 Ways to Childproof Your Windows, Online Article
  3. Unknown Author, Window Safety Tips for Kids, Online Article