SECURITY SYSTEMS GUIDE

Access Control Installation UK: Door Entry & Access Systems

Everything UK electricians and building managers need to know about access control installation — system types, door hardware, fail-safe vs fail-secure, power supply design, cable requirements, fire alarm integration, and realistic costs for 2026.

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12 min readUpdated 2026-05-18Andrew Moore, Founder of Elec-Mate

Written and reviewed by Andrew Moore, founder of Elec-Mate, against BS 7671:2018+A4:2026, IET Guidance Note 3 and the IET On-Site Guide.

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Key Takeaways

  • 1Access control systems range from basic keypad entry (£500–£800 per door) to biometric and video intercom systems (£1,500–£3,000+ per door). System grade should match the security risk level of the premises.
  • 2Fail-safe locks (power off = door unlocks) are required on fire escape routes in buildings under BS 5266 and BS EN 50131 principles — fail-secure locks must never be fitted to escape routes without interlock to the fire alarm.
  • 3Power supplies for access control must be dedicated, appropriately rated (typically 12V DC or 24V DC), and include battery backup. Insufficient power causes lock release failures and false unlocks.
  • 4Cable selection is critical: use screened 2-core cable for lock power, multi-core data cable for keypad/reader wiring, and CAT6 for IP-based readers. All cables must be mechanically protected in accessible areas.
  • 5Integration with the fire alarm system is a mandatory safety requirement — on fire signal, fail-safe locks must release and fail-secure locks on escape routes must be interlocked to release via the fire alarm output.
01 · Security Systems Guide

Types of Access Control System

Access control systems restrict and monitor entry to buildings, floors, and rooms. The appropriate system type depends on the security requirement, number of users, and whether the installation is residential, commercial, or industrial.

  • Keypad entry (PIN code) — the simplest and lowest-cost option. Users enter a PIN to release the door lock. No credentials to issue or manage. Suitable for low-security internal doors (plant rooms, storage), but PINs are easily shared and cannot be individually audited. Budget £500–£800 per door installed.
  • Proximity fob/card readers — the most common access control technology in UK commercial buildings. Uses RFID (Radio Frequency Identification) fobs or smart cards. Each user has a unique credential that can be individually enrolled, suspended, or deleted via management software. Provides full audit trail of who entered and when. Standard technology: MIFARE or HID.
  • Biometric readers — fingerprint, facial recognition, or iris scanning. No credential to lose or share — the user is the credential. Suitable for high-security areas (server rooms, laboratories, cash handling). Higher cost and requires enrolment of all users. Consider data protection obligations under UK GDPR when processing biometric data — biometrics are special category data.
  • Video intercom systems — door entry panels with camera and two-way audio, releasing the door remotely via an internal monitor or mobile app. Standard for residential apartment blocks, GP surgeries, and commercial reception points. IP-based video intercoms integrate with CCTV NVR systems and can provide door-open event recordings.

Most commercial installations combine credential types — for example, fob reader at the main entrance with keypad backup for management, and biometric reader in the server room. Multi-door networked controllers allow all doors to be managed from a single software interface.

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02 · Security Systems Guide

Door Strikes vs Magnetic Locks

The choice of lock hardware depends on the door type, frame construction, security requirement, and whether the door is on a fire escape route. The two main types are electric strikes and electromagnetic (magnetic) locks.

  • Electric door strikes — replace the strike plate in the door frame. When energised (or de-energised in fail-safe mode), the strike releases to allow the latch to pass. The door and frame appear normal and the mechanical lock remains in place. Suitable for most door types. Lower holding force than magnetic locks (typically 500–1,000 kg). Can be fail-safe or fail-secure.
  • Electromagnetic (magnetic) locks — a powerful electromagnet mounted on the door frame attracts a steel armature plate on the door. Holding forces of 280 kg to 600 kg are standard; heavy-duty versions exceed 1,000 kg. Inherently fail-safe (power off = door releases). No moving parts — very reliable. Requires a door closer to ensure the door re-latches. Most common on fire escape doors and high-traffic controlled doors.
  • Electric mortice locks — a motorised or solenoid-operated mortice lock. Higher security than strikes or magnetic locks. Fail-secure versions common. Used on perimeter security doors, secure room entrances, and high-value storage. Requires robust door and frame construction. Current draw is higher — factor into PSU sizing.
  • Door closers — a mechanical door closer is required on any controlled door to ensure the door returns to the locked position after entry. Fire doors require a fire-rated closer (BS EN 1154). Access-controlled fire doors must not be held open by the closer — use only electromagnetic hold-open devices that release on fire alarm signal.
03 · Security Systems Guide

Fail-Safe vs Fail-Secure — Life Safety Implications

The fail state of the lock — what happens when power is lost — is a life-safety decision that must be made correctly. Getting it wrong can trap occupants in a fire or leave a building insecure during a power outage.

  • Fail-safe on escape routes — mandatory — any door on a designated escape route must fail safe (release on power loss). This includes final exit doors, stairwell doors, and corridor doors on escape routes. Electromagnetic locks are inherently fail-safe. Fail-secure locks must never be fitted to escape routes without a fire alarm interlock that forces release on activation.
  • Fail-secure on security doors — appropriate for doors that are not on escape routes, where the security risk of an unsecured door during power loss outweighs other concerns. Examples: server room access, cash storage, plant rooms with no occupancy. Must have battery backup to maintain security during power outages.
  • Emergency break-glass release — all access-controlled doors must have a means of emergency egress without requiring a credential. For escape routes, a green break-glass unit or push-to-exit button with direct lock release wiring (not through the access control panel) is required. This ensures exit is always possible regardless of system status.
  • Battery backup requirement — power supply units must include battery backup sufficient for a minimum of four hours' standby (BS EN 50131 guidance for security-graded systems). This ensures the access control system continues to operate during mains power outages.

The building's fire risk assessment and fire strategy document should specify the fail state for each controlled door. Consult the building's responsible person or fire engineer before specifying hardware on escape routes.

04 · Security Systems Guide

Power Supply Requirements

Access control power supply design is one of the most commonly underspecified elements of an installation. An inadequate power supply causes lock release failures, system resets, and false unlocks — all of which undermine security and safety.

  • Calculate total current demand — add the rated current draw of all locks (typically 300–600 mA per magnetic lock at 12V DC), all readers (50– 200 mA each), the control panel, and any auxiliary devices. Add 20 per cent headroom. A four-door system with magnetic locks may need 3–4A continuous supply.
  • Dedicated circuit — run a dedicated circuit from the distribution board for the access control PSU. Never share with general power or lighting circuits. Protect with a suitably rated MCB. Label the circuit clearly at the board and at the PSU.
  • Battery backup — use a PSU with integral battery backup or a separate battery module. Size the battery to maintain full system operation for a minimum of four hours on standby (BS EN 50131 Grade 2 and above). Fit a low battery indicator and test the battery backup at commissioning and annually.
  • Voltage drop on cable runs — calculate voltage drop over the lock cable runs. A 12V magnetic lock drawing 500 mA over a 30-metre run on 1.0mm² cable will see approximately 0.5V drop — within tolerance. Longer runs or higher current loads may require 1.5mm² or 2.5mm² cable, or a higher supply voltage with a local voltage regulator at the lock.
05 · Security Systems Guide

Cable Types & Installation

Cable selection and installation quality determine long-term system reliability. Access control wiring runs in areas that are difficult to re-cable — getting it right first time matters.

  • Lock power cable — 2-core screened, 1.0mm² or 1.5mm² depending on run length and current draw. Screen connected to earth at the PSU end only. Where the cable passes through a door frame (for door-mounted hardware), use a flexible section with a door loop/hinge loop to prevent wire fatigue from repeated door opening.
  • Reader/keypad data cable — multi-core screened, typically 6-core or 8-core 0.5mm² (for Wiegand or RS-485 reader interfaces). Screen at panel end only. Keep data cables away from power cables and fluorescent lighting ballasts — 50mm minimum separation, or use screened cable throughout.
  • IP reader cable (PoE) — CAT6 (or CAT6A for runs over 70 metres). Power over Ethernet (IEEE 802.3af or 802.3at) delivers both power and data over a single cable, eliminating the need for a separate power supply to each reader. Use a PoE-capable network switch rated for the number of PoE ports required.
  • Mechanical protection — all cables in accessible areas (below 2.1 metres from floor level) must be run in conduit or trunking. Metallic conduit provides the best protection and acts as additional screening. In ceiling voids and risers, use cable tray or basket tray. Label all cables at both ends and at every junction point.

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06 · Security Systems Guide

Integration with the Fire Alarm System

In any building with a fire alarm system, integrating the access control with the fire alarm is a mandatory safety requirement. The purpose is to ensure that in the event of a fire alarm activation, all escape routes are immediately accessible.

  • Fire alarm relay output — the fire alarm panel provides a volt-free relay output that changes state on fire alarm activation. This output is wired to the access control panel's fire alarm input (or directly to the lock PSU's release input). On activation, all fail-safe locks on escape routes immediately release. This wiring must be fire-resistant cable (FP200 or equivalent) to maintain integrity during a fire.
  • Fail-secure locks on escape routes — if a fail-secure lock must be used on an escape route (which should be avoided), it must have a direct override wired from the fire alarm relay output. The override must release the lock regardless of the access control panel's status. This requires careful hardware selection — not all fail-secure locks have a direct release input.
  • Electromagnetic hold-open devices — where fire doors are legitimately held open (for ventilation or traffic management), electromagnetic hold-open devices compliant with BS EN 1155 must be used. These release automatically on fire alarm activation. Standard door stops, wedges, or mechanical hold-open devices are not permitted on fire doors.
  • Testing and documentation — the fire alarm integration must be tested during access control commissioning and documented in the O&M manual. The integration must also be tested during annual fire alarm service. Provide a cause-and-effect matrix showing which fire alarm zones release which access control doors.

Coordinate closely with the fire alarm contractor during commissioning. The fire alarm system must not be modified to add the access control interface without updating the fire alarm installation record and commissioning documentation.

07 · Security Systems Guide

Access Control Installation Costs (2026)

Access control costs vary significantly with system complexity, door hardware quality, cable run lengths, and management software requirements. The figures below are for professionally installed systems in the UK.

  • Basic keypad system — £500–£800 per door, including keypad, electric strike or magnetic lock, PSU, and installation. No ongoing software cost. Suitable for low-security internal doors.
  • Networked fob/card reader system — £800–£1,500 per door for a quality networked system with proximity readers, door controllers, management software, and audit trail. Additional doors on the same network cost less as infrastructure is shared.
  • Biometric system — £1,200–£2,500 per door for fingerprint readers, rising to £2,000–£4,000 for facial recognition. Includes enrolment of all users. Cloud-managed biometric systems may carry a per-user per-month subscription.
  • IP video intercom — £1,500–£3,000 per door entry point for a quality IP video intercom with mobile app integration and NVR recording. Includes door panel, internal monitor or app licence, electric strike, and installation.

These costs do not include ongoing software licences, managed service contracts, or hardware maintenance agreements. Networked systems with cloud management typically carry an annual fee of £100–£500 per site. Maintenance contracts for commercial systems are typically 10–15 per cent of installation cost per year.

08 · Security Systems Guide

For Electricians: Quoting and Winning Access Control Work

Access control installation is a growing market as more UK businesses upgrade legacy key-based systems to electronic access. Electricians with data cabling and low-voltage system skills are well placed to take on this work alongside their electrical contracting business.

Quote Access Control Jobs Accurately

Use the Elec-Mate quoting app to build accurate quotes for access control installations. Include lock hardware, PSU, cable, conduit, control panel, software licences, commissioning, and fire alarm integration — all in one professional PDF quote.

Build Relationships with Security Contractors

Many NSI/SSAIB-approved security contractors subcontract the electrical installation work to NICEIC or NAPIT registered electricians. Position your business as the electrical subcontractor of choice for access control, CCTV, and intruder alarm work in your area.

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