When does replacing physical keys with electronic credentials actually pay back? Real numbers for NZ offices, apartments, and trade sites.
The pitch for access control is usually about features: audit logs, mobile credentials, time-zoned access, instant revocation. The pitch for physical keys is about simplicity and zero ongoing cost. Both are valid. The economic question — when does keyless actually save money — depends almost entirely on staff turnover and lock-replacement cost. This post walks through the maths.
A physical key has three hidden costs that don’t show up on the invoice:
The break-even point with electronic access depends on how often these events happen, which is mostly driven by staff turnover.
Stable team, low turnover (one person leaving every 18–24 months). Two doors (main entry, server room).
Verdict: Keys win on cost alone. Access control’s value here is the audit log and the mobile credential UX, not the lock-replacement saving. Worth it if those features matter to your management; not worth it on cost.
High turnover (1 leaver per month, average), 4 controlled doors (front, back, kitchen, office).
Verdict: Roughly break-even by year 3. Access control wins on year 5+ comfortably, plus you get instant credential revocation (a leaver can’t come back at 2am the night they’re fired) and audit logs.
Constant turnover (renters, owners selling, contractors), 8 controlled doors (lobby, basement carpark vehicle and pedestrian, lift lobby per floor, bin room, gym).
Verdict: Access control isn’t comparable to keys here — physical keys aren’t a viable choice for an apartment building of any size. The decision is which platform, not whether.
Moderate turnover, mixed staff and contractor traffic, 5 controlled doors (pedestrian entry, warehouse roller door, office, server, sample room).
Verdict: Keys win on simple cost over 3–5 years. Access control wins on the audit log (who opened the warehouse roller door at 3am Saturday?), the time-zoned access (cleaners only during 6–8am), and revocation speed. For a workshop with valuable tools or stock, the audit and revocation features usually justify the upgrade even when raw cost-per-door doesn’t.
Access control installation · Access control buyer’s guide · Security audit checklist
Indicative supplied-and-installed price for a Comsys CCTV system. Move the inputs to match your site — the calculator updates live.
This calculator is a guide only. Final pricing depends on the site visit — specific camera models, mounting access, cable routing, and any access control or alarm integration can move the number up or down. We always quote in writing after a free on-site assessment, with brand and model itemised so you can see exactly what you’re paying for.