Door Intercoms

About Door Intercoms

Door intercoms have become an essential security and communication solution for both residential and commercial properties across the UK. These systems allow property owners and occupants to screen visitors, grant access remotely, and maintain security without the need to physically approach the door. Modern door intercom systems range from simple audio-only units to sophisticated video intercoms with smartphone integration, offering everything from basic two-way communication to advanced features like remote unlocking, video recording, and integration with existing access control systems.

Whether you're a tradesperson installing security solutions for clients, a facilities manager upgrading building access systems, or a homeowner looking to improve property security, door intercoms provide a practical first line of defence. Today's systems are available in wired and wireless configurations, with options to suit everything from single-dwelling homes to multi-tenanted apartment blocks. Many modern units comply with BS EN standards for electrical safety and are designed to withstand the UK's varied weather conditions when installed as external door stations.

The technology has evolved significantly in recent years, with IP-based intercoms offering connectivity through existing network infrastructure, cloud-based storage for video footage, and mobile apps that allow you to answer your door from anywhere in the world. Installation options range from straightforward surface-mounted units requiring minimal wiring to flush-mounted systems that integrate seamlessly with building architecture, making door intercoms suitable for new builds, renovations, and retrofit security upgrades alike.

Jargon Buster

Two-Wire System

An intercom installation method that uses just two wires to carry both audio signals and power, simplifying installation and reducing cable requirements compared to traditional four-wire systems.

Video Door Station

The external unit of a video intercom system, typically featuring a camera, microphone, speaker, and call button. Usually rated to IP65 or higher for weather resistance in UK conditions.

Access Control Integration

The ability of an intercom system to interface with electric strikes, magnetic locks, or other access control hardware, allowing remote door release from the internal handset or monitor.

IP Intercom

A network-based intercom system that uses Internet Protocol to transmit audio and video over standard Ethernet cabling or Wi-Fi, enabling remote access via smartphones and integration with other smart building systems.

Handset vs Hands-Free

Handset systems require lifting a telephone-style receiver to communicate, whilst hands-free models use built-in speakers and microphones for conversation without needing to hold anything, offering greater convenience.

Call Memory/Recording

A feature that logs visitor calls and may capture images or video of callers when you're unavailable to answer, providing a security record of all door activity.

Who Uses Door Intercoms?

Door intercom systems are specified, installed, and maintained by a diverse range of professionals and end users:

• Electricians and sparkies who install and wire intercom systems as part of security upgrades and new build electrical installations
• Security system installers specialising in access control, CCTV, and integrated building security solutions
• Facilities managers responsible for maintaining and upgrading security systems in commercial buildings, offices, and industrial premises
• Property developers and landlords fitting intercoms to residential developments, HMOs, and rental properties to improve security and manage access
• Maintenance teams servicing and troubleshooting existing intercom installations in housing associations and commercial properties
• Commercial building managers overseeing reception areas, controlled access zones, and visitor management systems
• DIY enthusiasts and homeowners installing wireless systems or upgrading existing intercoms to improve home security
• Gate and barrier specialists integrating intercoms with automated gates and vehicle access control systems

How to Choose the Right Door Intercoms

Selecting the appropriate door intercom system depends on several key factors that should align with your specific requirements and site conditions:

Audio or Video: Decide whether audio-only communication is sufficient or if visual identification is necessary. Video intercoms provide enhanced security by allowing you to see visitors, but cost more and require greater bandwidth for IP systems or more complex wiring for analogue installations.

Wired vs Wireless: Wired systems generally offer more reliable connectivity and are ideal for new builds or major renovations where cable runs can be planned. Wireless intercoms are perfect for retrofit applications where running cables would be disruptive or impractical, though signal strength and battery requirements need consideration.

Single or Multi-Dwelling: Determine whether you need a simple one-to-one system or a multi-tenant configuration where multiple residents can be called from a single door station. Multi-dwelling systems require different wiring topologies and directory management features.

Power Supply: Check whether mains power (230V UK standard) is available at both door station and monitor locations, or whether battery or Power over Ethernet (PoE) options would be more suitable. Consider backup power for critical security applications.

Integration Requirements: Consider whether the intercom needs to work with existing access control systems, electric door strikes, CCTV networks, or smart home platforms. IP-based systems typically offer the greatest integration flexibility.

Weather Resistance: For external door stations, look for appropriate IP ratings (IP65 minimum for UK weather) and anti-vandal features such as metal construction and tamper-resistant fixings, particularly important for ground-floor installations in public areas.

Smart Features: Modern systems may offer smartphone connectivity, cloud recording, motion detection, night vision, and integration with voice assistants. Consider which features genuinely add value versus which increase complexity and cost unnecessarily.

Popular Accessories

To complete your door intercom installation and ensure optimal performance, consider these complementary products:

• Electric door strikes and magnetic locks for remote door release functionality integrated with the intercom system
• Power supplies and transformers providing stable 12V or 24V DC power to door stations and monitors, with battery backup options
• Additional handsets or monitors allowing multiple answer points throughout larger properties
• Extension cables and connectors for installations requiring longer cable runs between door stations and internal units
• Weatherproof housings and rain shields providing additional protection for door stations in exposed locations
• Surface-mount and flush-mount backboxes for professional installation of internal monitors and external door stations
• Network switches and PoE injectors for IP-based intercom systems requiring network connectivity
• Memory cards and storage devices for video recording and call logging on systems with recording capabilities
• Entrance panels and directory frames for multi-tenant systems requiring name plates and multiple call buttons

Frequently Asked Questions

Can I install a door intercom myself or do I need an electrician?

Simple wireless or battery-powered intercoms can often be installed by competent DIYers following manufacturer instructions. However, wired systems requiring mains power connection (230V) must be installed by a qualified electrician to comply with UK Building Regulations Part P. Systems integrating with electric locks or access control typically also benefit from professional installation to ensure reliable operation and proper security configuration.

What's the difference between a wired and wireless door intercom?

Wired intercoms use physical cables to connect the door station to internal monitors, offering reliable connectivity and no battery concerns, but requiring cable installation through walls. Wireless systems communicate via radio frequency or Wi-Fi, making them easier to install in existing buildings but potentially subject to signal interference and requiring regular battery changes or charging for portable monitors. Wired systems are generally preferred for permanent installations, whilst wireless units suit rental properties or where cabling isn't feasible.

How far can a door intercom signal reach?

For wired systems, cable runs can typically extend 50-100 metres depending on wire gauge and system specifications, with longer distances possible using signal boosters. Wireless intercoms generally operate within 150-300 metres in open space, but UK building construction (particularly solid walls and metal structures) can significantly reduce this range. Always check manufacturer specifications for your specific environment and consider that wireless range may be substantially less through multiple walls.

Are door intercoms weatherproof for UK weather conditions?

External door stations designed for outdoor use are built to withstand UK weather with IP ratings indicating their protection level. Look for minimum IP65 rating, which protects against dust and water jets from any direction. Quality units feature drainage channels, sealed connections, and corrosion-resistant materials. However, installation location matters – positioning door stations under porches or overhangs extends lifespan, and regular maintenance ensures continued weather resistance.

Can I view my door intercom on my smartphone?

Many modern IP-based and Wi-Fi enabled door intercoms offer smartphone apps that allow you to answer calls, view video, and release doors remotely from anywhere with internet connectivity. These systems typically require a stable home broadband connection and may involve subscription fees for cloud recording or advanced features. Traditional wired analogue systems generally don't offer smartphone integration, though some can be retrofitted with smart adaptors or replaced with hybrid systems offering both traditional monitors and mobile app access.