The verdict in three sentences
For a London business centre with 3 sites and 42 meeting rooms, an off-the-shelf workspace management tool remains the right call as long as billing follows standard rules and corporate accounts stick to simple bundles. A custom booking platform (roughly £22,000 to £52,000 in 2026) pays off once manual workarounds cost more than £1,700 a month or an enterprise client demands rules the software cannot handle. The smart move is to price the missing features before comparing subscriptions.
What each option really costs
Workspace and room booking software in the UK typically costs £130 to £520 a month depending on sites, resources and members. Paid add-ons are common: access control integration, accounting connectors, white labelling, API access. A custom platform requires a heavier upfront investment, then annual maintenance of about 15 to 20% of the build cost.
| Cost line (2026 estimates) | Workspace software | Custom platform |
|---|---|---|
| Upfront cost | £0 to £1,700 setup | £22,000 to £52,000 + VAT |
| Subscription or maintenance | £130 to £520 per month | £3,500 to £8,500 per year |
| Access control module | £40 to £130 per month extra | Access provider API integration in scope |
| White label (domain, branding) | Often top tier only | Native |
| Custom pricing rules | Limited to built-in models | Unlimited, coded to your contracts |
| Time to go live | 2 to 4 weeks | 10 to 16 weeks |
| Ownership of data and code | Data exportable, code not | Both yours |
Software wins clearly on speed and risk. Custom wins on flexibility and asset value, provided there is a real business need behind it.
The features most often missing
Across 42 rooms at 3 addresses, off-the-shelf tools rarely fail on booking itself. They fail on billing and corporate accounts.
| Business centre requirement | Typical software coverage | Cost of the manual workaround |
|---|---|---|
| Hourly billing with discount after 4 hours | Partial (fixed tiers) | 3 to 5 hours of rework a month |
| Corporate bundles shared across 3 sites | Often per site only | Monthly spreadsheet reconciliation |
| Badge active only during the booked slot | Depends on access provider | Manual activation at reception |
| Card pre-authorisation and no-show fee | Simple payment, fee charged manually | 5 to 10% of no-shows never billed |
| Purchase orders and cost centres for large clients | Rarely supported | Invoices reissued by hand |
| Accounting export with per-site analytic codes | Generic CSV | 4 hours of data entry a month |
Each row converts into hours and lost revenue. That total is what justifies, or rules out, a bespoke build.
How to calculate the break-even point
Three steps. First, add up the annual software cost including add-ons. Second, put a value on the workarounds: front desk and finance hours, revenue lost to no-shows, enterprise contracts turned down. Third, compare that total with the annualised cost of a custom build over 5 years, maintenance included.
Need a professional website?
Kolonell builds websites that attract clients, optimized for the Sénégalese market. Free quote in 2 minutes.
A middle path often works: keep the software for booking and build a dedicated billing and corporate portal layer on top of its API. This typically costs £10,000 to £22,000 and lets you validate the need before rebuilding everything. If you go for a full platform, plan for enterprise authentication too, which we cover in our article on adding SAML SSO to a B2B app.
Mini case study
Sarah, COO of a business centre with 3 sites in London (City, Canary Wharf and King's Cross), pays £410 a month for her software plus £100 for the access control module: £6,120 a year. Her team spends 18 hours a month on workarounds (multi-site bundles, purchase orders, accounting export), valued at £32 per loaded hour: £6,912 a year. Unbilled no-shows represent 6% of £450,000 in room revenue, half of which could be recovered with pre-authorisation: £13,500 a year. Total cost of the current setup: £26,532 a year.
A custom platform at £42,000 amortised over 5 years comes to £8,400 a year, plus £6,300 maintenance and £1,500 hosting: £16,200 a year. The annual gap is £10,332. In cash terms, the platform saves about £18,700 a year against current running costs (£26,532 minus £7,800 of ongoing costs), so the £42,000 is recovered in roughly 2.2 years. Sarah chose the middle path at £16,000, with a full rebuild planned if enterprise revenue exceeds 30% of the total.
FAQ
How long does it take to build a custom booking platform? Allow 10 to 16 weeks for a first version with booking, card payments, corporate accounts and back office. A custom layer on top of existing software ships in 6 to 8 weeks.
Can we connect our existing access badges? Yes, if the access control provider exposes an API, which most recent systems do. Integration usually takes 5 to 10 development days.
Is card pre-authorisation compliant? Yes, through a payment provider supporting Strong Customer Authentication. The hold is released after the slot and only the fee set in your terms is captured, for example 50% of the price for cancellations under 24 hours.
What happens if the developer disappears? Require in the contract a transfer of code ownership, repository access and technical documentation. With those three, another team can take over maintenance in 2 to 4 weeks.
Is custom worth it for a single site with 10 rooms? Rarely. Below about 20 rooms and without complex corporate accounts, software at £130 to £260 a month remains more cost-effective.
Let's scope your project. Send us your number of sites, rooms and billing rules, and we will price both scenarios with a go-live timeline. 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.
