MIESCOR BUILDERS INCORPORATED (MBI), a wholly-owned subsidiary of Meralco Industrial Engineering Services Corporation (MIESCOR), was established in 1995. 
As a company, MBI has been continuously compliant with DOLE implementing rules and regulations and has successfully registered under DOLE DO-174. MBI also holds Philippine Contractors Accreditation Board (PCAB) license category "AAA" with main specialty in electrical works and expertise in general engineering and building, distribution utility services, civil and mechanical works.
In terms of business directions, the company's main focus is to provide a diversified range of services to clients with its three business lines – Distribution Utility Services (DUS), General Construction (GenCon) and Technical and Allied Services (TAS).

Distribution Utility Services
MBI is now the biggest contractor of Meralco, serving its whole franchise area, with 75% of the company’s workforce fully dedicated to Meralco Networks. As Meralco’s technical and back-end support arm, we are responsible for majority of Meralco’s electric transmission and distribution system.

General Construction
We have expertise in General Engineering, Building & Substation Construction, Site Development, Equipment Foundation Works, and Communication & Underground Lines. Our clients include Meralco, Rockwell Land, DM Wenceslao & Associates, ACDI, MIRDC-DOST, and Golden Arches Development Corporation, among others.

Technical and Allied Services
We have expertise in maintenance, and testing and commissioning of substations. TAS team has already made a name for its competencies in this field with clients like MIESCOR, Clark Development Corporation (CDC), Clark Electric Distribution Corporation (CEDC), Quezon Power, Siemens, First Gen Hydro Power, CE Casecnan, Global Business Power, Webforge Philippines and CBK Power Company Limited.

MBI is ISO certified!
MBI was ISO 9001:2008 (Quality Management System) certified from 2015 to 2018 and has been ISO 9001:2015 (new version of QMS) certified since 2018 by TUV Rheinland. We have also been ISO 14001:2015 (Environmental Management System) certified since 2016. We are true to our commitment to provide quality, efficient and cost-effective services while protecting the environment by integrating the environmental aspects and impacts into our decisions and operations.

MBI advocates Safety as a way of life.
MBI has been recognized by third party organizations and clients for its outstanding safety performance in the execution of their projects.

• 2019 Award of Excellence from Safety Organization of the Philippines, Inc. (SOPI) for achieving 10,997,999 Safe Manhours without Lost Time Accident from April 2017 to May 2019
• 2018 Safety Award of Merit in recognition of MBI’s Perfect Safety Record in 2018 while rendering Outsourced Distribution Services to Meralco Networks and supporting the client’s commitment in providing an incident-free workplace
• 2018 Best Safety Program in recognition of MBI’s successful implementation of an exceptional safety program given on December 6, 2018 during the Meralco Networks Contractors Appreciation Night
• 2018 SOPI’s Award of Excellence for achieving 7,004,693 Safe Man-hours without Lost Time Accident (LTA) from April 2017 to August 2018, given last October 26, 2018 during the 51st National Industrial Safety Conference held at Clark Freeport Zone
• 2017 SOPI’s Award of Distinction for achieving 5,376,480 safe man-hours without Lost Time Accident from May 2016 to April 2017