Serving businesses across the whole of the UK 200+ projects delivered since 2012 170+ clients, from startups to national brands Serving businesses across the whole of the UK

Now taking on new projects

+44 (0) 7587 557 546 hello@flitzen.co.uk
Flitzen.
  • Testimonials
Get a quote↗↗
Who we are
The people behind the work.

A Mayfair team of designers, developers and problem-solvers, building for UK businesses since 2012. Senior people on every project, from the first call to launch.

About Flitzen ↗
92%Client satisfaction
170+Clients
Start here
About Flitzen

Our story, the people behind the work, and how we run a project from the first conversation to launch.

Our approach The people Common questions
Read our story ↗
More about us
Why FlitzenThe difference, process & promises ↗ TestimonialsClient reviews & the review wall ↗ CareersOpen roles and life at Flitzen ↗ CharityThe causes we support ↗ Trade markFlitzen is a registered UK mark ↗ Find usWhere we are and how to reach us ↗
Featured
The team Flitzen · Mayfair, London The Flitzen Technologies team at work in the London studio
The people behind it Mayfair, London
Meet the team ↗
Services
One partner, for everything.

One senior partner for everything you build, from AI to apps to infrastructure. Personal, accountable, on time.

All services ↗
6Core practices
12+Years
Featured practice
Bespoke AI solutions built by Flitzen for UK businesses
Bespoke AI Solutions

Automation, integration and custom models built around how your business actually works.

Explore AI ↗
More services
Website DesignSites, e-commerce & web apps ↗ App DevelopmentiOS, Android & cross-platform ↗ Software SystemsEnterprise systems & APIs ↗ Cloud & TechInfrastructure, migration & strategy ↗ SEO & GrowthSearch, performance & visibility ↗ Built for a sectorIndustry-specific sites & systems ↗
Featured
Case study Electrical & Mechanical Services · construction platform Screenshot of the Electrical and Mechanical Services construction platform built by Flitzen
Construction Platform Software
View case study ↗
Our works
Work we're proud of.

170+ clients. 200+ projects delivered. Browse by what you need, or by your sector.

View all work ↗
170+Clients
200+Projects
By type
AI NewFace recognition, computer vision & automation ↗ WebsitesBespoke sites & web apps ↗ Phone AppsiOS, Android & cross-platform ↗ SoftwareCustom systems & platforms ↗
By industry
Sports & Leisure Finance & Accountancy Construction & Real Estate Home & Maintenance Beauty & Wellness Healthcare & Fitness Education & Childcare Travel Solutions Technology Charity Retail & Fashion Pet Services Waste Management Personal Branding
Featured
Case study One Golf Club · membership platform Screenshot of the One Golf Club membership platform built by Flitzen
One Golf Club Sports & Leisure
View case study ↗
Flitzen Technologies
  • Who we are
  • Why Flitzen
  • Careers
  • Charity
  • Find us
  • What we do
  • AI Solutions
  • Website Design
  • App Development
  • Built for a sector
  • Our work
  • AI
  • Websites
  • Phone Apps
  • Software
  • Testimonials
  • Home
Get a quote WhatsApp
hello@flitzen.co.uk +44 (0) 7587 557 546
Home / Insights / Moving a swim school onto new software
Booking and scheduling

Moving a swim school onto new software

The switch itself is rarely the hard part. What decides whether it goes well is the order you move things in: families and class structure first, active subscriptions second, history last. Do it between terms, run both systems for a fortnight, and take the first payment run on the new platform only once the old one has proved it agrees.

By Darshan Parmar, Founder, Flitzen Technologies UK · Published 16 August 2026 · 4 minute read
On this page
Why swim schools stay on software they have outgrown What actually has to move Pick the gap, not the date The payment run is the real test How long it takes Common questions

Got a project in mind?

Get a quote
The Mini Dolphins swim school booking platform and parent app built by Flitzen

Why swim schools stay on software they have outgrown

Almost nobody stays because the software is good. They stay because the cost of leaving looks unknowable. There are four hundred families on the system, half of them on a recurring payment, and the register that gets printed on a Saturday morning is the one thing that must not break.

That fear is reasonable, but it is usually pointed at the wrong risk. Moving the data is a solved problem. What goes wrong in a switch is almost always timing and payments: a term boundary missed, or a direct debit taken twice because two systems both thought they were live. Those are scheduling decisions, not technical ones, and they are the part worth spending your attention on.

What actually has to move

It helps to separate the things that must be right on day one from the things that can follow later. Most of the anxiety attaches to the third column, and most of it is misplaced. Nobody has ever cancelled because last year\'s attendance history arrived a fortnight after launch.

What has to move when a swim school changes software
WhatWhen it has to be rightWhat goes wrong if it is not
Families and swimmers Before launch Parents cannot log in, and your register is wrong
Class structure and levels Before launch Nobody can be placed, so nothing else works
Timetable and venues Before launch Bookings land in the wrong pool or the wrong hour
Active subscriptions First payment run Families are charged twice, or not at all
Outstanding credits First week Parents lose make-up sessions they have already earned
Attendance history Can follow later Reporting is thin for a term, and nothing else
Old invoices Can follow later Nothing, as long as the records still exist somewhere

Pick the gap, not the date

The single decision that matters most is when. Move between terms, in the gap when no classes are running and no payment is due. A school on a term structure usually has three or four of these windows a year, and they are worth waiting for.

Avoid the fortnight before a term starts. That is when re-enrolment happens, when parents are logging in for the first time in months, and when your team has the least attention to spare. A switch that would have been uneventful in the quiet week becomes a crisis in the busy one, for no reason other than the date.

If you cannot wait for a term gap, phase it instead. Take bookings on the new system for the coming term while the old one finishes billing the current one. That is slower and slightly more work, and it is much safer than trying to move everything on a Sunday night.

The payment run is the real test

Everything else can be corrected quietly. A payment taken twice cannot, because the parent sees it before you do.

Before the first live run, reconcile deliberately: every active subscription on the old system should have exactly one match on the new one, at the same amount, on the same day. Check the total against last term\'s figure. If the two numbers disagree and you cannot explain the difference in a sentence, do not run it.

Then cancel the old mandates properly rather than leaving the old account dormant. A dormant billing system is the most common cause of a duplicate charge, because it is still perfectly capable of taking money and nobody is watching it any more.

How long it takes

For a bespoke build, migration is part of the project rather than a separate exercise, and a typical swim school system runs eight to sixteen weeks from the first call to launch. The data movement itself is a small share of that. Most of the time goes on agreeing how your rules actually work, which is time you would have spent anyway.

Plan on running both systems side by side for about a fortnight after launch. Not because the new one is doubtful, but because a fortnight covers one full weekly cycle twice, which is usually enough for anything odd to surface while the old system is still there to check against.

Common questions

No, provided you export before you cancel anything. Family records, class structures and active subscriptions can all be moved, and we handle migration as part of the project. The thing to protect is access: keep the old system readable until the new one has completed a full payment cycle, because an export you cannot re-run is a single point of failure.

In a gap between terms, when no classes are running and no payment is due. Avoid the fortnight before a term starts, which is when re-enrolment lands and your team has the least spare attention. If no gap is available, take bookings on the new system for the next term while the old one finishes billing the current one.

They are matched one to one onto the new system before the first live payment run, at the same amount and on the same day, and the old mandates are cancelled rather than left dormant. Reconcile the total against the previous term before running anything. Duplicate charges almost always come from an old billing system nobody switched off.

They should have to do as little as possible. Families are set up in advance so that a parent's first experience of the new system is signing in, not registering again. Expect to send one clear message explaining what is changing and when, and to answer questions for a week or so afterwards.

A bespoke swim school system is typically eight to sixteen weeks from first call to launch, with migration included rather than charged separately. Moving the data is a small part of that; most of the time goes on agreeing how your rules work. Allow a further fortnight of running both systems in parallel after go-live.

Where to go next

  • Swim school software ↗
  • What a booking system needs to do ↗
  • Get a quote ↗

If you want a straight answer about your own situation, tell us what you are trying to do and we will say what we would do, including when the answer is that you do not need us. Start a conversation.

Keep reading

More insights

All insights ↗
→Next Budgeting a project How long does bespoke software take to build?
Start a project
hello@flitzen.co.uk↗
+44 (0) 7587 557 546

Now taking on new projects

The studio
12 Old Bond Street
Mayfair, London W1S 4PW
View on map ↗
170+Clients nationwide
200+Projects delivered
Flitzen Technologies

A London-based IT services firm delivering bespoke software, web and mobile solutions for ambitious UK businesses. Trusted since 2012 for precision, reliability and measurable outcomes.

Explore
  • About Flitzen
  • Why Choose Us
  • Services
  • Industries
  • Our Works
  • Testimonials
Solutions
  • Swim School Software
  • Waste Collection Websites
  • Princess Party Websites
  • Website Design
  • App Development
  • AI Solutions
Company
  • Careers
  • Charity
  • Contact
  • Get a Quotation
  • Privacy Policy
  • Trade Mark
Follow
LinkedIn Instagram
Serving the United Kingdom from London: AI Development London IT Services Harlow, Essex

This page was last updated on 16 August 2026.

© 2026 Flitzen Technologies UK Limited. All rights reserved. Competence you can rely on.
Flitzen.