The verdict in three sentences
For a 7-site London gym chain with 9,000 members, custom management software costs between £70,000 and £140,000 depending on scope, with payback often under 18 months. Off-the-shelf club platforms at £150 to £300 per site per month work, but they lock you into their payment processing, their access hardware and their roadmap. The real financial lever is lower churn, from 18 % to under 10 % per quarter, driven by automated win-back messages and attendance tracking.
What churn costs a London chain
With an average membership of £45 a month, each point of quarterly churn equals about 90 lost members, or roughly £48,000 of annual revenue gone. In most chains we audit, the data already exists (turnstile entries, renewal dates, booked classes), but it sits across a spreadsheet, a point-of-sale tool and coaches' WhatsApp groups.
| Metric (7-site chain) | Today | Target with software |
|---|---|---|
| Active members | 9,000 | 9,000 then growth |
| Quarterly churn | 18 % | 9 to 10 % |
| Members lost per year (estimate) | about 6,500 | about 3,400 |
| Win-back delay after expiry | 10 to 20 days | 3 days before expiry |
| Renewal rate at term | 55 % | 72 to 78 % |
| Front-desk time spent on payments | 4 h per day per site | 1.5 h |
| Revenue preserved (2026 order of magnitude) | baseline | £500,000 to £650,000 per year |
The maths is simple: recovering even a third of lost members pays for the whole project within the year.
Custom build or off-the-shelf platform: the 2026 comparison
UK club platforms are mature, but they take a margin on direct debits, push proprietary access readers and charge extra for each integration. For a chain with its own brand app, pricing model and multi-site transfers, the licence becomes a constraint.
| Criterion | Off-the-shelf platform (SaaS) | Kolonell custom software |
|---|---|---|
| Upfront cost | £2,000 to £6,000 setup | £70,000 to £140,000 |
| Recurring cost for 7 sites | £150 to £300 per site per month, i.e. £12,600 to £25,200 per year, plus payment margins | £10,000 to £16,000 per year (hosting and maintenance) |
| Direct debit and card payments | built in, with processing margin | your own provider (GoCardless, Stripe) at cost |
| Pay-as-you-go and cash | partial | native, with per-site till close |
| Access control | costly proprietary readers | QR code, RFID badge or existing turnstiles |
| Data ownership | with the vendor | yours, hosted where you choose |
| Feature roadmap | shared with all clients | yours |
Over three years the gap narrows once payment margins (often 1 to 2 % of revenue, or £50,000 to £100,000 a year for this chain) are counted, and the custom tool stays your asset.
The modules that cut churn
Good gym chain software rests on four building blocks: membership management (plans, freezes, transfers between sites, referrals), access control (dynamic QR code in the app, badge, turnstile sync), class booking with waiting lists, and the win-back engine. The engine spots members who have not visited for 14 days, sends an SMS or app notification, then alerts the site manager. Add a dashboard per site: class occupancy, daily takings, at-risk members.
| Module | Indicative 2026 budget | Timeline |
|---|---|---|
| Memberships, plans and multi-site payments | £22,000 to £40,000 | 6 to 8 weeks |
| QR or badge access control | £13,000 to £26,000 | 4 to 6 weeks |
| Class booking and waiting lists | £10,000 to £22,000 | 4 weeks |
| Automated SMS, push and email win-back | £9,000 to £18,000 | 3 weeks |
| Member mobile app | £13,000 to £26,000 | 6 weeks |
| Executive dashboards | £7,000 to £13,000 | 2 to 3 weeks |
Mini case study
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Tom, managing director of a 7-site chain across Hackney, Islington and Camden, has 9,000 members paying £45 a month on average. He invests £105,000 in custom software with win-back automation and QR access. Quarterly churn falls from 18 % to 11 % within two quarters: about 630 members kept per quarter. At an average of 4 extra months per retained member, that is roughly £113,000 preserved per quarter. Even halving that assumption, the project pays back in under six months.
FAQ
How much does custom gym management software cost in London?
For a multi-site chain, budget £70,000 to £140,000 in 2026 depending on modules. A single site can start around £30,000 with memberships and access control.
Can we keep our existing turnstiles and badges?
In most cases, yes: most controllers accept relay or API integration. Allow £1,500 to £4,000 per site if an interface box is needed.
How long does rollout across 7 sites take?
Allow 4 to 6 months for the full version, with a pilot site from month three. Migrating 9,000 member records takes about a week.
Does it handle UK GDPR and direct debit rules?
Yes: consent logs, data retention rules and Bacs mandates are part of the specification. Your payment provider keeps card data, so PCI scope stays minimal.
What happens if a site loses its internet connection?
Access control runs in local fallback mode for 24 to 48 hours, then resyncs. Make it a requirement in the brief from day one.
Let's scope your project. Send us your number of sites, members and access hardware, and we will price a scope between £70,000 and £140,000 with a site-by-site rollout plan. Detailed quote within 48 h. WhatsApp +221 77 596 93 33.
Mohamed Bah
Fondateur, Kolonell
Passionate about digital and entrepreneurship in Africa, Mohamed has been helping Sénégalese businesses with their digital transformation since 2020. Founder of Kolonell, he believes every SME deserves a professional and accessible online présence.
