The posting
Job title: Quantity Surveyor (Plumbing & Sanitary / Irrigation) — Junior Classification: Construction → Quantity Surveying Work type: Full time Salary: S$2,800 – S$4,000 per month
About us
Koon Seng Engineering & Construction is a Singapore M&E specialist contractor in plumbing & sanitary, automatic irrigation, and rainwater harvesting systems.
The role
You will handle the commercial side of P&S, irrigation and RWH packages: measurement, progress claims, supplier and subcontractor negotiation, variations, and cost control. You report to the Head of QS directly and work daily with project managers and Accounts.
What you will do
- Take off quantities from M&E drawings for P&S, irrigation and RWH works
- Prepare and submit monthly progress claims; track claimed vs certified
- Issue RFQs, compare quotations, and negotiate commercial terms with suppliers and subcontractors
- Prepare and assess variation orders with proper substantiation
- Maintain project cost trackers and material reconciliation
- Support subcontract award, back-charges and final accounts
- Work with Accounts on DO-to-invoice verification and payment certification
What we are looking for
- Diploma or Degree in Quantity Surveying, Building, Civil or Mechanical Engineering, or related
- 1–3 years' QS experience. M&E or P&S exposure is an advantage; strong fresh graduates will be considered
- Able to read M&E drawings and specifications
- Solid Excel. Google Sheets, AutoCAD or Bluebeam is a plus
What we offer
- S$2,800 – S$4,000 per month
- Clear Career Progression
- Medical Insurance
- 5 Day Work Week
- Office in Jurong



