Allowing for potential costs in an estimate / quotation

[DariusCool]

Is there a formal word for a potential cost that may arise.

Cost to fit part A
Potential additional costs if part B is required after fitting A

As a crude example Break calipers need to be fitted but after that it may be brake discs

 

[Newchodge]

contingency?

 

[SillyBill]

Unforeseen.

 

[Stas Lawicki]

Variation to contract
Expansion in scope
Additional services provision
Extras
Options

 

[BusterBloodvessel]

"Further remedial work" ?

 

[Frank the Insurance guy]

Subjectivity?

Quote subject to no requirement for Part B.
Part B may be required following fitting of part A.
Revised quotation to include supply and fit of Part B is £....

 

[AllUpHere]

From a copy perspective, you don't need to be clever with it. Just explain what needs to be done, and what might need to be done.