Video Intercom Systems for Flats: A Buyer's Guide
By the DC Fire & Security engineering team — installing and maintaining fire and security systems since 2010. Updated June 2026.
Quick answer
A video intercom lets residents see and speak to visitors before releasing the communal door — from a flat monitor or, on modern systems, their phones anywhere. Retrofit no longer means rewiring: IP and GSM systems reuse existing cabling or need none to the flats at all. For blocks, video plus fob access control is now the standard specification.
How modern systems differ from the old buzzer
- Video entrance panel: visitors are seen, not just heard — parcel couriers, trades and unwanted callers identified before the door opens
- App answering: residents answer from anywhere; deliveries stop failing because someone's at work
- Fob/keypad integration: the same panel handles resident access control and visitor calling
- Call logging and missed-call snapshots on many platforms — useful for managing agents
- Concierge/agent functions: remote door release, time-limited trade codes, audit trails
Retrofitting a block without rewiring
The blocker in older blocks was always cabling to every flat. Three answers now exist: IP systems that reuse existing two-wire or network cabling; GSM/4G systems that call residents' phones with no in-flat hardware at all (the fastest retrofit — panel on the door, SIM inside, done); and hybrid designs where flats choose a monitor or app-only. For a typical 6–20 flat block, GSM or two-wire IP video replaces a dead analogue system in a day or two without touching flat interiors.
What blocks should budget
A GSM audio/video panel for a small block typically lands £1,200–£3,000 installed depending on flat count and door hardware. Full IP video with flat monitors runs from around £300–£600 per flat plus the entrance panel and lock work. Add encrypted fob access control to the same entrance from a few hundred pounds more — doing both together shares the cabling, lock and labour. Managing agents: data protection applies to video at the door (signage, retention limits on recorded systems); we supply compliant setup as standard.
Frequently Asked Questions
Can residents answer the intercom from their phone?
Our analogue intercom is dying and the phone line switch-off is coming — what now?
Does a video intercom record visitors?
Who pays in a leasehold block?
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