Software for the people who let space, and the people who fix it.
We're a small UK company that builds and runs four products. Each does one kind of work properly, runs in a web browser with nothing to install, and is looked after by the people who built it.
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Storage Yard Manager
Caravan, motorhome and boat storage yards
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UnitLet
Containers, self storage, industrial units and yard space
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My Job Book
Jobs, quotes and invoices for tradespeople
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Tap In Book
Sign-in on arrival for gyms, clubs, churches and events
Storage Yard Manager
For UK caravan, motorhome and boat storage yards. Made for the laptop, PC or tablet in the yard office, and with you on your phone out on the plots.
- The whole yard as a colour-coded map: paid, due soon, overdue and empty
- Everyone who's late on one screen, with the reminder already written
- Customers and their caravans, motorhomes, boats and trailers, with insurance dates that warn you before cover lapses
- Storage agreements customers sign on their own phone
- Maintenance with photos, a diary for the yard, and a waiting list
- Reports, and exports your bookkeeper can use


UnitLet
For UK sites that let more than one kind of space — containers, self storage rooms, workshops and industrial units, and yard space — and would rather run them on one system than three.
- A site plan that shows what is paid, due, late, empty or out of service
- Monthly licences and proper leases side by side: English quarter days, service charge, rent reviews and break clauses
- Break, review and expiry deadlines tracked by the date notice has to be served, not the date of the event
- A compliance register for fire risk assessments, EICRs, asbestos, gas, PAT and EPCs, with what is overdue on the dashboard
- Arrears, maintenance jobs with photos, and meter readings between tenants
- Every unit, tenant and payment downloadable as a spreadsheet

My Job Book
For tradespeople who work on their own — plumbers and heating engineers, electricians, handymen. Made for the phone you already carry, so the whole job happens from the van.
- Today's visits in order, with directions and the customer's number one tap away
- Every customer's addresses, access notes, equipment and job history
- Photos, notes and your own checklists at the job, even with no signal
- Quotes and invoices with VAT done properly, or no VAT at all if you're not registered
- Who owes you what, with a reminder one tap away
- Everything downloadable as spreadsheets
It runs in the phone's web browser, on Android or iPhone, and the same account opens on a tablet or computer.



Tap In Book
For anywhere people turn up and sign themselves in — gyms and studios, clubs, churches and community groups, classes, events and parties. A tablet by the door, and the office side on the phone in your pocket.
- People sign in by tapping the first letter of their surname, then their name — no keyboard, ever
- Keeps working when the wifi drops, and catches up when it comes back
- Or no names on the screen at all: a date of birth and a surname initial, and nobody's name shows until the two match one person (this way needs the internet)
- Your people typed in or brought across from a spreadsheet, called what you call them — members, students, guests — and, where they pay, what each pays for
- Your weekly timetable, so an arrival lands on the right class or session, and a live board at the desk of who has just come in
- Who came this week and this month, how often, and who is over what they pay for
- Who is drifting away, while there is still time to say something
The newest of the four, and not open to everyone yet: it is taking its first places by email.
Different jobs, the same way of doing business.
Nothing to install
Each runs in a web browser on a laptop, PC, tablet or phone.
An address of your own
Every business gets its own web address, and its records are kept to it.
Your data, yours
Backed up every night, and yours to download as spreadsheets whenever you like.
Look before you sign up
Each has a public demo full of invented data, with its sign-in printed for anyone to use. No signup needed.
Paid through Paddle
Paddle is our Merchant of Record: it takes the payment and sends receipts and VAT invoices, and your card details never reach us.
A person replies
Email any of them and it reaches the people who build it — not a ticket queue.
It started with one storage yard.
A family-run caravan storage business in Essex was getting by on a limited custom system with a spreadsheet alongside it. Storage Yard Manager was built to replace both, and it has run that yard ever since.
UnitLet took the same thinking to sites that let containers, storage rooms and industrial units side by side, where a lease and a monthly licence have to live in one system. My Job Book took it to the tradespeople who keep property working, and do their paperwork from the van.
Property Workflow Systems Ltd was founded by Mario Szlapa, who builds and supports all four.
The company
- Name
- Property Workflow Systems Ltd
- Registered in
- England and Wales
- Company number
- 17376073
- Registered office
- Unit 6, Orchard Business Units, Cockaynes Lane, Alresford CO7 8BZ
- Payments
- Paddle, Merchant of Record
Write to the product you use.
There's no separate support desk here on purpose — it would only be a slower route to the same people. For anything else, any of these reaches us.
- Storage Yard Managerhello@storageyardmanager.co.uk
- UnitLethello@unitlet.co.uk
- My Job Bookhello@myjobbook.co.uk
- Tap In Bookhello@tapinbook.co.uk
Paying for a subscription? Subscriptions are taken by Property Workflow Systems Ltd through Paddle, our payment provider and Merchant of Record.
If you were part-way through paying, start again from Billing inside your own account — that brings your order with it to the checkout page.