Door Entry System Costs for Flats: GSM, Video and Per-Flat Pricing
By the DC Fire & Security engineering team — installing and maintaining fire and security systems since 2010. Updated June 2026.
Quick answer
Block door entry pricing in 2026: GSM systems (calls to residents' phones, no flat wiring) £1,200–£3,000 installed for typical small-mid blocks — the retrofit king. Full video systems with flat monitors: £300–£600 per flat plus entrance hardware. Audio-only replacements: from £150–£250 per flat. Fob access control adds a few hundred alongside. Lease/Section 20 mechanics shape procurement as much as hardware.
The pricing menu for blocks
| System type | Typical installed cost | Best for |
|---|---|---|
| GSM audio (calls phones) | £1,200–£2,000 (6-20 flats) | Fast retrofits, dead analogue replacements, no flat access needed |
| GSM video (app/phone video) | £1,800–£3,000 | Retrofit + visual ID without flat wiring |
| 2-wire video retrofit (reuses riser) | £250–£450/flat + entrance | Blocks with sound existing cabling wanting monitors |
| Full IP video (monitors per flat) | £300–£600/flat + entrance | Refurbs/new-builds, premium blocks |
| Audio-only like-for-like | £150–£250/flat | Budget compliance replacements |
| + Fob access control at entrance | £500–£900 | Always worth pricing in the same visit |
Why GSM rewrote block economics
The historic cost driver was flat access and riser wiring — twenty appointments, twenty handsets, one riser archaeology project. GSM systems delete it: panel at the door, SIM inside, residents answer on any phone anywhere — installation is a day, flat access zero, and the analogue switch-off problem (the dialler-killer detailed in our switch-off guide) is solved in the same stroke. Trade-offs stated honestly: call costs/SIM contracts (£10–£25/month per panel typical — budget it), reliance on residents' phones (no wall handset for the phone-averse), and per-resident programming admin (we handle via managed portals). For most failing-analogue blocks, GSM is the rational default — full video belongs where budget and appetite genuinely exist (the video intercom guide compares deeper).
Procurement mechanics for agents and RMCs
The block-buying realities: Section 20 consultation triggers near £250/leaseholder on qualifying works — most full-system replacements qualify, so consultation-ready quote packs (like-for-like vs GSM vs video options, costed) save a cycle; lease wording determines recoverability (door entry is normally service-charge plant — verify); and phasing options matter (entrance panel + GSM now, monitor upgrades later, fob integration in the same visit — the shared-labour saving our flats CCTV guide repeats). Specification hygiene: fail-safe lock integration with fire egress (always — the egress guide), DESFire fobs if adding access control (cloning, again), GDPR basics where video records (signage/retention — we configure), and maintenance pricing upfront (£150–£400/yr typical blocks). The replacement-vs-repair fork for ageing systems lives in our faults guide — bring its triage to any quote meeting.
Next steps for your fire or security system
If the guide has helped you narrow the specification, these are the relevant installation, maintenance and local service pages for the next stage.
Frequently Asked Questions
What does a 12-flat GSM video system actually cost?
Can leaseholders be charged per flat for door entry?
Our analogue system is dead and the switch-off finished the dialler — fastest fix?
Monitors or phones — what do residents actually prefer?
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