← Back to blogCase Study

Sixty units. The risk was
hiding in the averages

By PROXERA·Published 3 August 2026·6 min read
60+
Units across the portfolio
2
Letting agents managing them
97%
Looked fine on the statements
3
Quiet risks in the exceptions

Meet David

David holds just over sixty units, a mix of houses and small blocks, run day to day by two letting agents and a part-time bookkeeper. The monthly statements arrive on time and say broadly the same thing every month: occupancy strong, collections healthy, nothing to report. At his size that is what reporting looks like, totals and averages. He asked for a PROXERA review because he had learned to distrust exactly that: when sixty units are summarised into one page, the page always looks fine.

What the review found

Taken as averages, the portfolio was fine. The risk sat in the exceptions the averages had smoothed over. A cluster of safety certificates across one city all fell due in the same quarter, a renewal crunch nobody had planned for. A handful of longer tenancies had drifted well below the local market, invisible inside a healthy total rent figure. And arrears were creeping on two units, small enough each month to disappear into a strong collection rate, persistent enough to be a pattern. None of it was a crisis. All of it was the kind of thing that becomes one quietly.

What he did next

David did not change agents, and he did not need to. He shared the exceptions with them and turned the findings into a plan: the certificate cluster became a scheduled programme instead of a quarter-end scramble, the below-market tenancies went on the renewal calendar for a proper conversation, and the two arrears cases got attention while they were still small. His monthly routine changed too. He now starts with the exceptions view, what deviates, and only then glances at the totals.

What you can take from it

Past fifty units, information is not the problem. You have statements, spreadsheets and agents. The problem is that risk at scale does not show up in totals, it hides in the exceptions: the cluster, the drift, the creep. An average is a comfy place to hide a problem, and the bigger the portfolio, the comfier it gets. The discipline that protects a large portfolio is simple to say and hard to do by hand: see every deviation early, on its own, before it grows into the numbers you do watch.

What good looks like at this size

David’s portfolio was never in trouble. It was simply larger than any summary page could honestly describe.

  • Exceptions first, totals second. The strongest operators read what deviates before they read what averages. The average is rarely where the story is.
  • Small and early beats big and late. Almost every expensive problem in property began as a cheap one that nobody happened to see.
  • Your agents get better information too. A clear list of exceptions turns a monthly report into a shared plan, without changing who manages what.
  • Scale stops being a liability. Once every unit can be seen on its own, size goes back to being the advantage it should be.

Sixty units is not a problem to be managed. It is a position to be worked, once you can see it properly.

Example scenario. Figures are illustrative and not advice. Speak to a qualified adviser, accountant or solicitor before acting.

Get your PROXERA property review

See every property side by side: what’s working, what’s costing you, and what to look at next. Free, takes minutes, no card needed.

Get my property review

Get the next one first

Sign up for weekly updates, news and blogs from global investors on how to improve your portfolio.