Please carefully consider that the construction project will be sufficiently completed by the end of the month.
Please carefully consider that the construction project will be sufficiently completed before the month ends.
「月末までに工事完了できるか検討してみてください。」は、
"Please carefully consider that the construction project will be sufficiently completed by the end of the month."
"Please carefully consider that the construction project will be sufficiently completed before the month ends."
という表現を使うことも出来ます。
"carefully"「慎重に」 / "sufficiently" 「十分に」などの副詞を入れると「きちんと工事完了できるかしっかり検討してみてください」というニュアンスが伝わるかと思います。
「月末までに」は、"by the end of the month" / "before the month ends"
ご参考になれば幸いです。