A repair bill almost always has the same three parts, and only one of them depends on the damage.
Call-out
It covers the time to get there and the materials carried in the van. It is fixed and it appears even when the problem takes ten minutes.
Labour
What weighs here is access more than the part. Replacing a water heater jammed against a wall is a different job, even though the appliance is the same.
Materials
Ask to be told the make and model of what was fitted. An original part costs more and lasts twice as long as a generic one.
Why urgency costs more
Out of hours, at weekends and on public holidays the call-out goes up. If the fault can wait until Tuesday morning, let it wait.
Avoid paying twice
Always ask for the cause in writing, not just what was replaced. Changing the part without treating the cause brings the same problem back within months, and the second bill is always bigger.
In the OSCAR app you see the price before booking and keep a record of what was done.