GOD'S WORD® Translation
Otherwise, if you lay a foundation and can't finish the building, everyone who watches will make fun of you.

American Standard Version
Lest haply, when he hath laid a foundation, and is not able to finish, all that behold begin to mock him,

Berean Study Bible
Otherwise, if he lays the foundation and is unable to finish the work, everyone who sees it will ridicule him,

Douay-Rheims Bible
Lest, after he hath laid the foundation, and is not able ti finish it, all that see it begin to mock him,

English Revised Version
Lest haply, when he hath laid a foundation, and is not able to finish, all that behold begin to mock him,

King James Bible
Lest haply, after he hath laid the foundation, and is not able to finish it, all that behold it begin to mock him,

World English Bible
Or perhaps, when he has laid a foundation, and is not able to finish, everyone who sees begins to mock him,

Young's Literal Translation
lest that he having laid a foundation, and not being able to finish, all who are beholding may begin to mock him,

Luke 14:29 Additional Translations ...