Terrace Door Security: Review & Recommendations

Welcome to our large patio door security test 2020, where we present you all the patio door security systems we have tested in detail. We have put together detailed background information and also added a summary of the customer reviews on the net.

We want to make your purchase decision easier and help you to find the best patio door security for you.

You can also find answers to frequently asked questions in our guide. If available, we also offer you interesting test videos. You will also find some important information on this page that you should pay attention to if you want to buy a patio door lock.

The most important facts in brief

  • Around 80 percent of all break-ins occur via the patio door. Therefore, you should secure your patio door to prevent burglaries or at least make them more difficult so that the potential burglar gives up further action.
  • Burglars use both the locking and the hinge side to pry open the door. It is therefore important to secure both sides sufficiently. For example, with a bar lock on the locking side and a hinge lock on the hinge side.
  • You should make sure that the installation is carried out in accordance with the instructions for the respective fuse, as even small installation errors can destroy the effectiveness of the safety device.

patio door security test: the ranking

1st place: kwmobile lockable window handle

The lockable window handle from kwmobile is available in a practical set of 4 including 8 keys that fit all cylinders. This security system is suitable for all plastic, aluminium or wooden windows, whether opening inwards or outwards.

This lockable window handle not only provides protection for small children, but can also prevent break-ins. Customers of this security element appreciate above all the good quality at a relatively low price.

2nd place: ABUS additional window lock

The additional window lock from ABUS offers a lockable window handle safety device with integrated burglary protection and helpful child lock. With this security system, the patio door

Due to the adjustable bolt, this additional lock adapts to almost every window and can therefore be used universally. The pressure resistance against levering up amounts to over one ton thanks to the bolt claw.

3rd place: ABUS hinge side securing

The hinge side securing system from ABUS is suitable for inward opening patio doors. This system is particularly suitable for tight installation conditions. The operation works without a key.

The safety system is VdS-approved and DIN-tested. The pressure resistance is over one ton and thus provides optimum protection against levering. The open and closed position can be visually identified. Customers appreciate above all the simple and quick installation of the system.

Guide: Questions to consider before buying a patio door fuse

What is a patio door lock and why should I lock my patio door?

A patio door security system is a mechanical and electronic system that serves as a burglary protection. You should secure your patio door, as burglars specifically select the weak points of a house to attempt a break-in.

Around 80 percent of all break-ins occur via the balcony or patio door. This is because the terrace is often located off the street.

Therefore, you should especially secure your patio door to prevent burglary or at least make it so difficult that the potential burglar gives up further execution of the crime.

There are many ways to secure your patio door. D […]

Mechanical burglary systems make burglary more difficult because they counteract the burglar’s effort with a resistance.

Electronic security systems, on the other hand, cannot prevent a break-in, but only report it. They activate an acoustic alarm and, if necessary, also pass on a warning to the police.

How big the difference between unsecured and secured patio doors can be, you can see in the following videos:

How much does a patio door fuse cost?

There is a wide price range between the different patio door fuses. Depending on which fuse from which manufacturer you choose, the price can differ.
The cost is also strongly dependent on the resistance class and the desired requirements.

A patio door fuse does not have to be expensive. You can buy good security systems for a small amount of money. However, more extensive systems can also go into the three-figure range.

Where can I buy a patio door fuse?

You can buy a patio door security system in specialist shops or department stores, as well as in many online shops. The most important information can be found in specialist magazines or on special advice pages on the Internet.
If you buy your patio door locking system in an online shop, you have the advantage that you can compare the detailed information of the individual security systems and read customer reviews. In addition, online shops usually offer a larger selection of models.

If you decide to buy in a specialist shop, this has the advantage that you can inspect the device. You can get advice and can take the patio door fuse home with you.

According to our research, most patio door fuses are sold through these online stores:

  • amaon.de
  • ebay.de
  • windowdispatch.com
  • abus.com
  • obi.de

What do I have to pay attention to when buying a patio door lock?

If you decide to buy a patio door fuse, there are a few things you should consider. We have briefly summarized what is important to you.
Burglars use both the lock and the hinge side to pry open the door. Therefore, it is important to secure both sides sufficiently.
You can achieve this with a bar lock on the locking side and a hinge lock on the hinge side.

You should make sure that the assembly is carried out in accordance with the instructions for the respective securing device. Even small assembly errors can destroy the effectiveness of the safety device.

In general, we recommend that you install one security device per meter of window door. In the case of a patio door with a double leaf, you should install one security device per metre per leaf.

What alternatives are there to patio door security?

Basically, there is no alternative that can completely replace a patio door security system. We therefore recommend that these alternatives be used in addition to the patio door security to provide optimum protection for your home.
Window grilles or roller shutters
Window grilles or shutters; window grilles or shutters provide additional protection.
Alarm system
Alarm systems use light and sound signals to draw attention to a break-in. A burglary cannot always be prevented but the burglar is usually deterred and breaks off his act.


Burglars look for windows that lie in darkness in order not to be seen during the crime. Adequate lighting, especially on the terrace area, is therefore a good protection against burglary.

Security camera

A security camera cannot always prevent a burglary, but appropriate signs pointing to the security camera can deter burglars.

They also help to identify burglars after the crime.

Decision: What types of patio door fuses are available and which one is right for you?

To eliminate the weak points of patio and balcony doors, there are many different options you can choose from.

The following additional security measures counteract these weaknesses:

  • Security on the closing side or lock side
  • Securing on the hinge or hinge side
  • Safety film

What are the characteristics of a security device on the locking side or lock side and what are its advantages and disadvantages?

There are various security systems that are installed on the lock side of the patio door. For example, a lockable patio door handle or the so-called bar lock.

In the upper half of the picture a bar lock is attached. In the lower half of the picture a lockable patio door handle is visible. We would now like to go into these two options in more detail.

Lockable terrace door handle

The lockable patio door handle is also known as a locking system. This is the simplest conversion of the patio door. The installation is very simple.

Even if a burglar smashes the glass, he cannot open the door through the resulting hole.

In the case of lockable patio door handles, you should make sure that they work equally well when the door is closed and when it is tilted. Some lockable window or door handles are additionally equipped with a child safety lock

In addition to the classic lockable patio door handles, where the locking cylinder is integrated into the handle housing, there are also additional locks that function as combination locks.

Bar lock

The bar lock for patio doors is also mounted on the locking side. Two securing points at the upper and lower edge of the window ensure here that the window cannot be opened in the event of pressure loads.

Most bar locks are keyed alike. This means that they work in conjunction with the “normal” door lock. To operate the bar lock, a single closing operation on the existing door lock is therefore sufficient.


Quick and easy assembly without special tools
Prevents the door from being levered open
Retrofitting possible


Bar locks somewhat more expensive to purchase

What distinguishes a backup on the hinge or hinge side and what are its advantages and disadvantages?

A hinge lock is attached to the hinge side of the patio door. The securing is done by simply closing the door. With older hinge safety devices, the safety device must be manually unlocked before opening.

In modern hinge locks, the function is usually coupled with the engagement, so that it automatically rotates with the opening.


Prevents the door from being levered open
Retrofitting possible


Slightly more complex assembly
Manual unlocking for older models

This alternative is suitable for all window doors with tilt and turn fittings and can withstand about 1 ton of pressure. This option is particularly relevant for doors without mushroom head locking.

What distinguishes a security film and what are its advantages and disadvantages?

You can also secure your patio door with a safety film or shatter protection film that is stuck to the inside of the door pane. This is a transparent plastic film which holds the pane together even after the impact of force.

If you decide to buy a safety film for your patio door, you should make sure that the manufacturer complies with the standards of DIN EN 356.

Splinter protection films can be used on all conventional glass surfaces. Almost all safety films are self-adhesive and can be applied to the window surface without much effort.


Mounting without great effort
No special tools required
Low cost


Disc still shatters in the event of violent impact
Serves only as a supplement to mechanical fuses

Purchase criteria: You can compare and rate patio door fuses based on these factors

In the following we will show you on the basis of which aspects you can decide between the multitude of possible patio door security systems.

The criteria you can use to compare the fuses include

  • Resistance class
  • Terrace doors opening to the inside or outside
  • Keyed alike or with different keying
  • Open / closed position optically recognizable
  • Suitable for double sash windows
  • Alarm function

Now we will take a closer look at the individual purchase criteria.

Resistance class

Depending on the resistance class, a patio door can make a break-in considerably more difficult or almost impossible. Depending on the resistance class of your patio door, more or less additional security measures are necessary.

In new and renovated buildings, the installation of tested burglar-proof patio doors of at least resistance class RC 2 (N) provides you with good protection against burglary. With these patio doors it is ensured that there are no weak points in the entire construction.

We have prepared a table to give you an overview of the individual resistance classes. Since September 2011 the resistance classes are marked with “RC” for “resistance class”.

Terrace doors opening to the inside or outside

When choosing a suitable patio door security system, it is important to consider whether your door can be opened inwards or outwards. Most security variants are suitable for inward opening windows and doors.

If you have a patio door that opens to the outside, you should pay particular attention to whether your chosen security unit is suitable for this.

Keyed alike or with different keying

Most additional locking devices for the patio door are available as “keyed alike” or “keyed differently”.

Keyed alike additional locks offer the decisive advantage that several locks can be opened with only one key.

The disadvantage, however, is that there are only a handful of key variants that the burglar could also carry with him. In the event of a break-in using a glass handle, he could then open the locks within seconds.

Open / closed position optically recognizable

Depending on the type of security option selected, the open or closed position of the patio door is often visually recognizable. For example, through a red/green indicator.

Suitable for double door leaves

When deciding on a security mechanism for your patio door, you need to consider whether your door is a single or double door

Not all models are suitable for double door leaves. One possibility are bar locks, which can usually be used for double door wings. The locking system gives the lock a high resistance against pressure and lever attacks from outside.

Due to their narrow design, bar locks can be used universally, i.e. on almost all inward opening patio doors, including most double-leaf doors with and without a centre bar.

As a general rule, for a patio door with double leaves, one securing per leaf and per metre is recommended.

Alarm function

With some patio door fuses it is possible to equip the model with an additional alarm function. The alarm function with acoustic and/or optical signals makes the owners or neighbours aware of the burglar alarm.

Complex burglary protection systems forward the alarm to the control centre of a security company commissioned by the owner.

This function already reacts when the burglar tries to break in, if the burglar tries to lever open the window or if vibrations are perceived on the pane. The function then triggers a loud alarm of usually about 110 dBA.

Trivia: Worth knowing facts about patio door security

How do I install a patio door lock?

Installation plays a very decisive role with patio door security systems. You should make sure that the installation is carried out in accordance with the instructions of the respective fuse.

Most safety precautions can be applied relatively easily if you follow the manufacturer’s instructions exactly.

To give you a better idea, we have selected two short videos on the subject of installing a patio door security system.

Assembly of a bar lock:

How can I retrofit a patio door lock?

Both security devices on the lock side of the patio door, such as lockable patio door handles or bar locks, and security devices on the hinge side can be fitted relatively easily to any T

Of course you can also equip your patio door with a security foil to make it difficult for burglars.

You can secure your patio door particularly effectively by combining mechanical and electronic burglary protection systems.

The main criteria for retrofitted safety devices include

  • VDS & DIN tested
  • High internal safety class
  • KfW eligible
  • Additional protection against the three most common burglary methods
  • Universally applicable (left opening, right opening, single or double leaf)