The case for 200 units per property manager

The current benchmark

The industry average for a UK letting agency is 80–120 managed units per property manager. This number has barely moved in a decade. It is stuck there because the core workflows — tenant communications, maintenance coordination, compliance tracking — are still manual.

A typical PM spends their day reading emails, relaying messages between tenants and contractors, updating spreadsheets, and chasing certificate renewals. The actual decision-making — negotiating a rent increase, managing a dispute, advising a landlord on a refurbishment — takes up maybe 20% of their time. The rest is administration.

What breaks first as you scale

When an agency tries to push past 120 units per PM without changing the tooling, three things break:

Tenant response time. Messages take longer to answer. Tenants complain. Reviews suffer. Landlords move to a competitor.

Maintenance visibility. Jobs fall through the cracks. A reported leak becomes a major damp issue because nobody followed up. The cost to fix a problem at 10 days is significantly higher than at 48 hours.

Compliance misses. A gas safety certificate expires without renewal. An EPC lapses before a new tenancy. A selective licensing fee is missed. Each of these is a potential fine and a potential headline.

The AI-native PM

What changes when comms are drafted by AI, maintenance is triaged automatically, and compliance is tracked by a system that never forgets a deadline?

The PM stops being a message relay and becomes an operations manager. They review AI-drafted responses and approve them. They check the maintenance dashboard and escalate the edge cases. They look at the compliance calendar and handle the exceptions. The volume of decisions they make per day stays roughly the same — but the volume of units those decisions cover doubles.

Why 200 is the right target, not 500

Property management is not customer support. You cannot fully automate it. Disputes need human judgment. Complex maintenance (subsidence, major leaks, multi-party insurance claims) needs a PM who knows the property and the landlord. Rent negotiations, tenancy renewals, and end-of-tenancy check-outs all require a human presence.

200 units per PM is the point where the economics transform but the service quality holds. Beyond that, you start losing the human relationships that make a good agency defensible.

What this means for agency economics

An agency managing 600 units currently needs 5–6 PMs. At 200 units per PM, they need 3. That is 40% fewer staff costs on the same revenue. Margin per unit increases by roughly 30–40%, depending on your current cost structure.

This is not about replacing people. It is about deploying people on work that requires judgment, and letting software handle the rest. The agencies that figure this out first will have a structural cost advantage that compounds over time.