How to Secure a Door from the Inside (UK)

Securing a door from the inside is one of the most effective ways to prevent break-ins. It is widely reported that around 70% of burglars gain entry through the front door, making internal door security just as important as external locks and lighting.

This guide explains how to secure a front door from the inside, outlining practical methods, product types, and buying considerations to improve front door security.

How to Secure a Front Door from the Inside

Internal door security focuses on adding physical resistance and controlled access from the inside of the door. The most effective options include:

• Door braces and jammers
• Heavy-duty internal bolts and barricade systems
• Door chains and restrictors
• Front door peepholes and viewers

Each method adds an extra security layer and reduces the risk of forced entry.

Ways to Secure a Door Internally

1. Install a Door Brace

A door brace is one of the strongest ways to secure a door from the inside. It works by bracing the door against the floor, preventing it from being forced inward.

Door braces are often compared to the “chair under the handle” method seen in films but are engineered from metal and designed to absorb significant impact force.

Benefits:

• Adds extra door security from inside
• Suitable for front doors, back doors, and patio doors
• Available in temporary and permanent models
• Cost-effective and highly resistant to kicking and shoulder impact

Door braces are particularly useful for homeowners, renters, and people looking for non-invasive front door security.

2. Use a Door Stop Jammer

A door jammer is a common portable form of door brace and one of the easiest ways to secure a front door from the inside.

These devices fit under the handle and wedge against the floor, using downward pressure to resist forced entry. Many models are adjustable and suitable for hinged and sliding doors.

Key advantages:

• Portable and non-permanent
• Ideal for rented properties and student accommodation
• Some models withstand up to 250 kg of force
• Quick to deploy in emergencies

Door jammers are an effective solution if you want extra door security from inside without drilling or permanent fixings.

3. Fit Internal Barricade Bars

Barricade bars are heavy-duty door security devices designed to block inward movement of the door. They are fixed to the floor or door frame and locked into position when required.

Some commercial-grade systems can withstand forces exceeding 1,300 kg, making them one of the strongest internal door security options available.

Best suited for:

• High-risk properties
• Ground-floor flats and rear access doors
• Commercial or mixed-use buildings

Because of their appearance and installation requirements, barricade bars are used more often in commercial settings than residential homes.

What to Consider When Buying a Door Brace

Before purchasing a door brace or jammer, assess the following factors to ensure it will properly secure your door from the inside:

• Dimensions: Doors are not always standard size. Measure the door height, width, clearance, and thickness to ensure compatibility
• Placement and floor type: Consider where the brace will sit and whether it is compatible with your flooring (tile, carpet, laminate, or concrete)
• Door opening direction: Most internal braces are designed for inward-opening doors. So double check suitability before buying

Install a Door Chain for Controlled Access

A door chain is a simple but effective way to add extra security for a front door from the inside. It allows you to partially open the door while preventing full access.

Although door chains are not designed to stop determined forced entry, they significantly improve personal safety and opportunistic crime prevention.

Best practice for door chains:

• Install at a height accessible to all household members
• Choose a heavy-duty chain and reinforced fixing plate
• Test the chain after installation to ensure smooth operation and strength

For higher security, consider modern door restrictors or swing-bar locks, which are stronger than traditional chains.

Get a Peephole for Your Front Door

A front door peephole allows you to see who is outside before opening the door, reducing the risk of distraction burglary and doorstep scams.

Peepholes are inexpensive, quick to install, and provide a wide-angle view of the area outside your property.

Security benefits:

• Enables identity verification before opening
• Reduces reliance on opening the door to unknown callers
• Enhances front door security without electronics

Peepholes are an excellent alternative if you do not want to install a smart doorbell.

Heavy-Duty Internal Locks and Bolts

While door braces and jammers are excellent for resisting force, internal locking hardware provides everyday, fixed protection and is one of the most important ways to secure a door from the inside.

Install a Heavy-Duty Door Bolt

A heavy-duty door bolt is a simple but highly effective way to add extra door security from inside. These bolts are mounted to the inside of the door and slide into the frame or floor, preventing the door from opening even if the main lock is compromised.

Security benefits:

• Adds a second internal locking point
• Physically reinforces the door against kicking and levering
• Suitable for front doors, back doors, and side doors
• Available as surface-mounted or flush-fit bolts

For maximum protection, choose a solid steel bolt fixed into a reinforced door frame.

Fit an Internal Deadbolt or Night Latch

Internal deadbolts and night latches are designed specifically to secure a front door from the inside. Unlike spring locks, deadbolts cannot be forced back with a card or simple tool.

Why they improve front door security:

• Require physical rotation rather than spring pressure
• Resist picking, snapping, and manipulation
• Provide consistent everyday protection
• Often meet British Standard security ratings

These locks are a core element of high-security front door systems and should be professionally installed where possible.

Consider Internal Security Bars (London Bars)

Internal security bars, sometimes called London bars, reinforce the area around the lock and door frame. They are particularly effective on doors that are vulnerable to splitting or lock-forcing attacks.

Best used when:

• The door has a wooden frame
• There has been a previous burglary attempt
• Extra reinforcement is needed around the lock case

They work by spreading force across the door structure, making it significantly harder to break open.

How to Secure an Outward-Opening Door from the Inside

Outward-opening doors require different protection methods, as traditional door braces do not work on them. Internal reinforcement is still essential.

Install Hinge Bolts (Dog Bolts)

Hinge bolts are fixed to the hinge side of the door and slot into the frame when the door is closed. They prevent the door from being removed if the hinges are attacked.

Benefits:

• Protect against hinge-side attacks
• Essential for outward-opening front doors
• Hidden when the door is closed
• Strong, permanent internal security solution

They are one of the most effective upgrades for outward-opening doors.

Use Internal Security Bars or Drop Bolts

Frame-mounted security bars and internal drop bolts provide vertical and horizontal resistance, preventing the door from being pulled outward.

These are ideal for:

• Rear access doors
• Flats and apartment entrances
• Ground-floor properties
• High-risk locations

They significantly improve the structural resistance of the door system.

UK Front Door Security Standards (Supporting Authority Section)

When upgrading internal door security, look for products and doors that meet recognised UK standards:

• BS 3621 locks – British Standard for thief-resistant locks
• PAS 24 doors – Enhanced security performance standard
• Secured by Design doors – Police-backed security initiative

Using security-rated doors and locks strengthens insurance compliance and significantly improves burglary resistance.

Summary: Best Ways to Secure a Door from the Inside

To maximise internal door security:

• Use a door brace or jammer to resist forced entry
• Install a door chain or restrictor for controlled opening
• Add a peephole to verify visitors safely
• Ensure all devices are compatible with your door and flooring

Combining multiple internal security measures provides layered protection and significantly improves front door security.