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.
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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