Charles Ellicott Commentary 2 Chronicles 8:16

"Now all the work of Solomon was prepared unto the day of the foundation of the house of Jehovah, and until it was finished. [So] the house of Jehovah was completed." — 2 Chronicles 8:16 (ASV)

Now. — And, here equivalent to so.

Prepared means completed (2 Chronicles 29:35; 2 Chronicles 35:10; 2 Chronicles 35:16; a late use of the word nâkôn).

Until the day of the foundation ... until it was finished. — Solomon’s activity is apparently divided into two periods: namely, the preparations he made before and up to the foundation of the Temple (2 Chronicles 2:0), and secondly, the prosecution of the work to its completion (2 Chronicles 3:1 – 5:1). (The Hebrew text is, “until that day of the foundation,” that is, that memorable day, see 2 Chronicles 3:1–3.) All the versions, however, understand this phrase as meaning from the day of the foundation until the completion of the Temple. Perhaps ‘ad ha-yôm is, in the Chronicler’s Hebrew, equivalent to lĕmin ha-yôm, expressing the terminus a quo.

So the house of the Lord was perfected. — Omit so, and compare 1 Kings 9:25, and he finished [same root as perfected] the house. The verse thus closes the entire account of the building and inauguration of the Temple.