[Porsche-O-Phile]

"Little" changes aren't.

Ever.

And as a corollary, there really isn't any such thing as a "simple" project. They all have quirks and potential pitfalls and at least one thing that'll be a headache at some point in design or construction (or both).

Having a good contractor and a good architect who can both respect and deal well with each other is the single most important thing to job smoothness and ultimately, success.