Title
Leighton Contractors Philippines, Inc. vs. CNP Industries, Inc.
Case
G.R. No. 160972
Decision Date
Mar 9, 2010
Leighton Contractors awarded CNP Industries a fixed lump-sum subcontract for steelworks. CNP claimed additional costs for design revisions, but the Supreme Court ruled the fixed price included all work, and CNP failed to meet legal requirements for extra payments.
A

Case Summary (G.R. No. 120474)

Background of the Contract

On July 5, 1997, respondent submitted a proposal to act as a subcontractor for the construction of the structural steelworks, which was accepted by the petitioner on July 15, 1997. The fixed lump sum price for the subcontract was agreed upon at PHP 44,223,909. Following acceptance, the petitioner made revisions to fabrication drawings, resulting in substantial changes in the required materials, which the respondent estimated would incur additional costs. Despite these cost estimations, the respondent did not renegotiate the fixed lump-sum price.

Subcontract Terms and Work Progress

On July 28, 1997, the parties executed a subcontract outlining the defined scope of work to include explicit conditions such as the fixed lump-sum nature of the price, which would not allow for re-measurement or additional payments for errors in quantities. The project had a completion timeline set for November 6, 1997. A 10% down payment was made to the respondent shortly after the subcontract was signed. However, after initiating work, the respondent communicated claims for additional costs resulting from the previously mentioned design revisions, which were stated to be excluded from the original scope of work.

Project Completion and Takeover

Due to the respondent’s inability to meet project deadlines, the petitioner took over the project on April 27, 1998, after the respondent completed approximately 86% of the work. Following this takeover, the petitioner sought to determine the outstanding balance that it owed, but the respondent asserted that the modifications warranted additional payments.

Arbitration Proceedings

Discontented with the petitioner’s refusal to acknowledge the additional cost claims, the respondent brought the matter to the Construction Industry Arbitration Commission (CIAC). The key issue revolved around whether the costs associated with the additional steel for the design changes fell under the lump-sum contract. The CIAC ultimately ruled in favor of the respondent, stipulating that the additional costs should be recognized as they were considered additional works beyond the subcontract’s original terms.

Court of Appeals Findings

The petitioner filed a petition for review against the CIAC's decision. In its ruling, the Court of Appeals affirmed CIAC’s findings, emphasizing that the subcontract was explicit about the scopes of work to be covered within the fixed lump sum and that changes had not been formally authorized in accordance with Article 1724 of the Civil Code.

Supreme Court Ruling

Upon review, the Supreme Court found merit in the petitioner’s arguments, concluding that the additional costs claimed by the respondent were not covered by the fixed lump-s

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