When you need an emergency or ad-hoc engineer visit, our callout invoicing process depends on whether you are a contracted client (with a Wilson Alarms maintenance plan) or a non-contracted client.
We charge for a callout visit (which covers the first 30 minutes on-site time), any additional time as well as consumables used.
👥 Contracted Clients
If you hold a Wilson Alarms maintenance contract, callout visits are invoiced after the engineer has attended.
You’ll receive an invoice for the visit and any consumables used.
Payment terms: within 7 days of the invoice date.
Direct Debit clients – payment is collected automatically after the callout.
👤 Non-Contracted Clients
If you don’t have a maintenance plan, callout charges must be paid upfront before an engineer is dispatched.
This ensures your booking is confirmed and avoids delays.
Additional costs for parts or remedial works (if required) will be invoiced after completion, with 7-day payment terms.
💷 Callout Tariff
Charges vary depending on the time of day and type of client.
For details, see our:
✅ This process ensures contracted clients enjoy priority service and post-visit billing, while non-contracted clients can still access our emergency support with upfront payment.