Short answer: A spreadsheet works for a small number of units, roughly under 30, if you're organized and on site. Switch to software when you spend more than a few hours a month on invoices and chasing payments, when gate codes aren't reliably updated for late payers, or when you want customers to rent online without calling you.
Plenty of profitable storage facilities, parking lots and garage blocks run on a spreadsheet. It's free, flexible and you already know how to use it. The question is when its hidden costs overtake the price of software.
What a spreadsheet does well
- Free and flexible. Add any column you like.
- No learning curve.
- Fine for small, stable sites where tenants rarely change.
Where it breaks down
| Job | Spreadsheet | Management software |
|---|---|---|
| Showing availability online | Manual, often out of date | Live booking page |
| Renting a unit | Phone, email, paper agreement | Online, with e-signature |
| Monthly billing | Manual invoices or payment links | Automatic charges and retries |
| Late fees | Remembered (or forgotten) by hand | Applied on schedule |
| Gate codes for late payers | Changed by hand, if at all | Suspended and restored automatically |
| Occupancy and revenue | Formulas you maintain | Always up to date |
| History of notices and payments | Scattered across email and bank | One record per tenant |
The hidden costs of a spreadsheet
- Your time. Count the hours you spend each month on invoices, reminders, bookings by phone and updating codes. Multiply by what your time is worth.
- Late payments that aren't followed up. Without automatic reminders, fees and lockouts, delinquency tends to creep up. See how to reduce late payments.
- Lost rentals. Customers who want a unit at 9 p.m. rent from whoever lets them book online.
- Old rents. Without an easy view of what each tenant pays versus your current price, rate reviews don't happen.
- Mistakes. One wrong formula or deleted row and your numbers are off without anyone noticing.
A quick calculation
Take a 60-unit site. If you spend 6 hours a month on billing, chasing and bookings, and value your time at $30 an hour, that's $180 a month. If better reminders and lockouts recover even two late payments of $100 a month, that's another $200. Software in the $50 to $100 a month range pays for itself well before you count online rentals.
Your numbers will differ. The point is to count them.
Signs it's time to switch
- You have more than about 30 units, or you're adding a second site.
- You aren't on site every day.
- More than a handful of tenants pay late each month.
- You've lost track of who has which gate code.
- Customers ask if they can rent online.
- You dread the first of the month.
How to switch without chaos
- Clean up your spreadsheet: one row per unit, with tenant, rent, paid-through date and contact details.
- Choose software that imports a spreadsheet. See the best self storage software for small facilities.
- Move existing tenants to autopay over one or two billing cycles.
- Turn on online booking for vacant units first.
Unitgrove is built for operators making this move: upload your spreadsheet, connect payments and share a booking link. It launches in 2027, from $49 a month.
FAQ
Can I run a storage business with Excel or Google Sheets?
Yes, for a small number of units. Many owners start this way. It becomes time-consuming as you grow, especially for billing, late payments and access codes.
How much does self storage software cost?
Starting prices range from per-unit pricing around $1 per unit per month to flat plans from roughly $50 to $100 a month for small sites, with quote-based pricing for larger systems.
Is there a free self storage spreadsheet template?
You can build one with columns for unit, size, status, tenant, rent, paid-through date and contact details. Software becomes worthwhile once you want online booking and automatic billing.