Site conditions that add labor
Concealed wiring or plumbing issues, restricted access, an occupied household, and how much of the house needs protecting can all extend a timeline.
What the material choice implies
Where the scope starts and stops, what existing systems can support, material compatibility, and disposal responsibility should all be explicit in writing.
Permits and outside specialists
Certain scopes call for a permit, inspection, engineering review, or specialty trade. Confirm that locally rather than assuming.
For planning, not a bid
Treat any figure here as a starting range. A firm quote requires a look at your actual kitchen.