What we do

Building Materials

Koh Brothers set up its first concrete batching plant in the 1960s at Sungei Pang Sua, Singapore. Our Building Materials division, G&W Ready-Mix and G&W Precast, provide total ready-mixed concrete solutions to the construction industry. Our products include ready-mix concrete and high-quality pre-cast concrete, which is now customizable to suit more challenging building designs. 

In October 2013, G&W opened its first precast plant in Senai, Malaysia to complement its existing precast plants in Singapore to boost its production capacity to cater to higher demand for high quality precast components in Singapore and Malaysia.

With over 40 years of experience, we are recognized as an established manufacturer and supplier of high quality ready-mix. The awarding of the ISO 9001:2008, B3 OHSAS 18001:2007, bizSAFE, and GreenLabel Singapore bear as testimonies to our commitment to quality products and services.

At Koh Brothers, no job is too big or too small for us. Each core business is assigned and managed by a unique team of professionals to deliver excellent material quality and service.



G & W Group


Established in 1979, G & W Group is today a renowned one-stop quality building materials provider in Singapore and Asia. The group's core businesses are in providing ready-mix concrete, precast concrete products as well as renting concrete pumps.

G & W Group of companies is the building materials division of Koh Brothers Group Limited which is listed on the main board of the Singapore Exchange Limited. G & W Group has a strong presence in Singapore and Malaysia. Together with a strong fleet of equipment and modern manufacturing facilities, the group consistently churns out products and services of supreme quality.



G & W Ready-Mix Pte Ltd


From an initial set up with only two batching plants in 1979, we are today an established manufacturer and supplier of high quality ready-mix concrete with a total of 6 batching plants and 63 mixer-trucks in Singapore.


We are a member of the Ready-Mix Association of Singapore (RMCAS) and have been awarded with ISO 9001:2008, B3 OHSAS 18001:2007, bizSAFE, and GreenLabel Singapore.



G & W Industries Pte Ltd


The principal activities of the company are the manufacturing and sales of cementitious products, and rental of concrete pumps.



G & W Precast Pte Ltd


Established in 1998, G & W Precast Pte Ltd is one of the leading precasters in Singapore approved by BCA and HDB. It owns precast yards in Singapore and has invested in a massive yard in Senai. The combined area of the 2 precast yards is about 6.6 hectares, capable of holding 11 fully equipped production bays producing all types of precast components for both public and private development projects.

G & W Precast Pte Ltd provides technical and practical precast solutions to its customers to help them meet cost and schedule needs, with technical support provided from the design stage through to installation.