Clients usually accept contingency when it is tied to a real uncertainty. They resist it when it sounds like a random safety blanket.

Name the risk

Say what could change: hidden site conditions, incomplete assets, unclear integrations, stakeholder delays, supplier pricing, or unknown data quality. PMI’s risk and scope resources are useful context for thinking about uncertainty professionally.

Choose visible or hidden reserves

A visible contingency line works when the client understands the risk. A hidden reserve works better when showing the line would distract from the scope. Risk reserves in client quotes explains how to price unknowns without guessing.

Use assumptions and exclusions

Write: This quote assumes the existing wiring is usable. If replacement is required, we will quote that separately before proceeding. This is clearer than vague padding. FreshBooks’ quote guidance reinforces that expectations should be clear before work starts.

Add milestone reviews

For uncertain work, add a review point: after discovery, site inspection, prototype, or first phase. That gives both sides a fair chance to adjust before costs run away.

Use calm wording

The approach in quoting unforeseen work without sounding defensive applies here: explain risk as a normal project reality, not a sign of distrust.

Keep internal math private

In ququ, you can include visible contingency where useful, hide internal reserves where appropriate, and redistribute costs into a clean branded quote.