Spreadsheet vs Software: When Does a Self-Managing Landlord Actually Need to Switch?

Most self-managing landlords run their portfolio on a spreadsheet, and most software companies pretend that's a scandal. It isn't. A well-kept spreadsheet is a perfectly good tool for the job it's actually good at — and pretending otherwise is how landlords end up paying for software they didn't need. What follows is the honest version: what a spreadsheet does well, the three specific jobs it structurally cannot do, and a test for which side of the line you're on.

What a spreadsheet genuinely does well

A spreadsheet is flexible, free, and yours. For a landlord with one or two properties and stable, long-standing tenancies, it handles the core bookkeeping fine: rent in, expenses out, a tab for certificate dates, a tab for the tax year. If you're diligent about updating it, nothing about a spreadsheet stops you being a good landlord.

The operative phrase is if you're diligent about updating it. A spreadsheet is a record of what you did. Everything that goes wrong with spreadsheet-run portfolios goes wrong in the gap between what happened and what got recorded.

The three jobs a spreadsheet structurally can't do

1. It can't interrupt you. A spreadsheet knows your gas certificate expires on 14 November. It will not tell you. The reminder function in your head, your calendar, or a phone note is a separate, manual system you must also maintain — and the failure mode is silent. Nothing looks wrong in October; the certificate is simply expired in December. Deadline-tracking is the single strongest reason landlords move to software: the tool's job is to watch dates so that a busy fortnight can't become a compliance breach.

2. It can't hold evidence. Since the Renters' Rights Act, possession runs through evidenced grounds, deposit deductions live or die on documentation, and hazard-response duties are heading toward enforceable timelines. A cell saying "boiler fixed 12 May" is not evidence; the engineer's invoice, the tenant's report, and the dated photo are — and they live in your email, your camera roll and a drawer. Software's second structural advantage is that the document, the date and the property are one linked record, not three locations. (Our guide to what records to keep and for how long covers the legal retention periods.)

3. It can't be shared safely. The spreadsheet lives on one person's laptop. The moment anyone else needs to act — a partner while you're away, an accountant at year-end, eventually whoever takes the portfolio over — they get a copy that's immediately out of date, or edit rights that risk the original. If more than one person touches your rentals, "the file on my laptop" is a single point of failure.

The honest test: six questions

Score one point for each "yes":

1. Do you have more than two properties, or more than one tenancy changing in a typical year?
2. Has a certificate, licence or insurance renewal ever expired without you noticing — even for a week?
3. Would gathering the full paper trail for one tenancy (agreement, deposit evidence, certificates, rent history) take you more than ten minutes?
4. Does anyone else — partner, accountant, family — ever need access to the portfolio's records?
5. Do tenants report repairs through more than one channel (calls, texts, WhatsApp, email)?
6. Are you doing the same data entry twice — once in the spreadsheet, once somewhere else (tax notes, reminder apps, message threads)?

0–1: keep the spreadsheet. Genuinely. Spend the money on a gas engineer instead.

2–3: you're at the crossover. The spreadsheet still works, but you're supplying the diligence that a system should. This is the stage where a mistake usually forces the decision — it's cheaper to make it before the mistake.

4–6: you've already outgrown it. You don't have a record-keeping tool; you have a second job maintaining one.

If you do switch, judge software on the failure points

Not on feature counts. The test for any landlord software — ours included — is whether it fixes the three structural gaps: does it chase the deadlines unprompted, does it keep documents attached to the property and tenancy they belong to, and can the right people see it without breaking it? Anything else is decoration.