1. The plaintiff's claims against the defendants are all dismissed.

2. The costs of lawsuit shall be borne by the Plaintiff.

1. Basic facts

A. The Plaintiff is a corporation with the purpose of construction business, and the Defendants jointly engage in real estate business, etc. under the trade name “C”.

B. On April 1, 2015, the Plaintiff entered into a contract with the Defendants for the construction of new warehouse facilities in Jung-gu, Incheon (hereinafter “instant construction”) with respect to the construction cost of KRW 190,30,000,000 (value-added tax of KRW 173,000,000,000,000), from April 1, 2015 to June 30, 2015, from April 1, 2015 to June 30, 2015, the warranty period is 5% of the contract amount, and the warranty period is 1 year (hereinafter “instant contract”).

C. During the construction process of the instant case, the Plaintiff settled the first settlement with the Defendants to reduce the construction cost as KRW 166,571,444 (excluding value-added tax), and agreed to make the second settlement with respect to the additional construction being undertaken thereafter.

On August 1, 2015, the Plaintiff completed the instant construction work.

E. The Plaintiff received a total of KRW 277,7960,000 from the Defendants until now.

[Ground of recognition] Facts without dispute, entry of Gap evidence 1 to 6, purport of the whole pleadings

2. Determination

가. 청구원인에 관한 판단 ⑴ 당사자 주장의 요지 ㈎ 원고 피고들은 원고에게 미지급 공사대금을 지급하여야 하는바, 추가 공사에 대한 2차 정산금액이 111,619,466원으로 확정되었으므로 피고들은 연대하여 원고에게 미지급 공사대금 2,805만 원(= 1차 공사정산금액 166,571,444원 2차 공사정산금액 111,619,466원 1, 2차 정산금액에 대한 부가세 합계 27,819,091원 - 2억 7,796만 원, 원단위 이하 버림)과 이에 대한 지연손해금을 지급할 의무가 있다.

㈏ 피고들 2차 공사정산금액 중 에이동과 비동 외부거푸집 공사비용 각 350만 원 합계 700만 원은 이중청구된 것이고, 자재구입비용 중 엘보 부분 462,000원과 소켓 부분 486...