A facilities firm in Leeds wanted engineers to accept jobs without a radio. The first fixed price was £22,000 and said nothing about VAT, nothing about a GDPR record of processing, and nothing about how card payments and monthly contracts would be collected. Engineers worked across Manchester and Birmingham. Some clients in London insisted on a purchase-order flow. A useful 2026 budget starts by naming those rules, then the screens.
GBP bands before VAT
A job-sheet app with login, assignments, and photos typically sits at £19,000–£34,000 before 20% VAT. Add scheduling, parts, and customer signatures and expect £45,000–£82,000. A product with offline maps, invoicing, and a client portal is £98,000–£175,000. Glasgow and Edinburgh rollouts often add travel and a second terminology pass; Bristol and Liverpool pilots are cheaper if the workflow is already proven in Leeds. These bands match how we scope UK app projects. Pair them with the public site if customers must book before they ever install anything.
Compliance and store costs
- A short GDPR assessment: what you store, the lawful basis, retention, and how a person in London or Leeds asks for deletion.
- Consent screens that are specific, not a single unticked wall of text.
- The ICO fee where it applies to the company, separate from the build.
- Stripe at about 1.5% plus 20p for one-off cards, and GoCardless for contracts that should be direct debit.
- Apple and Google memberships owned by the company.
- 20% VAT on the agency invoice.
- An annual care slice for OS breaks and store policy changes.
Flutter or React Native for a job sheet
Flutter for a dense field screen
Engineers tap with gloves, outdoors, on mixed Android handsets. Flutter keeps the job sheet stable and is a strong default when there is no existing web component library to reuse.
React Native when a portal already exists
If the Manchester office already runs a React portal for clients, React Native can share types and some UI. Budget real time for Stripe and GoCardless modules, and for an accessibility pass that procurement in Birmingham will ask about. Sharing code is not free.
Briefing without a change-order spiral
Write ten jobs: accept a job, photograph a fault, collect a card, start a direct debit, export a subject's data. Mark everything else as later. CrazzyCodes will answer with a range, VAT, and the named owner of each payment and store account.
Request a GBP range
Share the jobs and the data you store. We will price VAT, consent, and payments as separate lines.
Request an app estimate