Start with the maker's schedule
Find the service requirements for the exact machine, age and usage. Provide the workshop with the relevant model details, operating hours and service history. Ask which scheduled work their quote covers and which checks or repairs are outside it.
A fixed-price service and an estimate for labour plus parts are different offers. Label each clearly so that a low initial figure does not appear more complete than it is.
Compare the same scope
Ask whether the quotation includes specified consumables, filters, labour, travel or transport, and disposal charges. Record any exclusions. If the workshop uses a different scope from the manual, ask for an explanation before agreeing.
Separate routine service work from known faults. Describe each fault accurately and ask whether diagnosis is included, separately charged or dependent on further authorisation.
Agree how extras will be handled
Give the workshop a reliable contact and agree a limit beyond which they must obtain approval. Ask how they will document their findings and explain options. Do not authorise safety-critical repairs solely on a vague description you do not understand.
Discuss likely completion dates and what happens if parts are delayed. Where the machine is needed for a particular job, plan an alternative rather than assuming every service can be completed immediately.
Prepare the handover record
Provide the manual or relevant history the provider requests, and record what equipment and attachments are being handed over. Agree collection arrangements and the condition in which the machine should be returned.
After the work, keep the invoice, service checklist and any report of unresolved issues together. Ask the provider to distinguish completed work from recommended future work and from defects that prevent use.
Use the result in your budget
Update annual ownership costs using actual expenditure, noting unusual repairs separately. Read HSE's safe-maintenance guidance when arranging work. A good service comparison explains the work, responsibility and record you will receive, rather than simply identifying the lowest quoted number.