The register that structures a S$50 billion industry
Singapore awarded a preliminary S$50.5 billion in construction contracts in 2025, and almost every firm competing for the public-sector share of that work had to hold one thing first: a registration on the Building and Construction Authority’s Contractors Registration System (CRS). The CRS is not a licence to build — it is a classification of who may tender for what. It sorts contractors two ways: by workhead, which names the trade, and by grade, which caps the size of public tender the firm may bid for. Learn to read those two coordinates and a company’s place in the industry becomes legible in seconds.
Workheads: the trade, in code
The CRS carries around 50 workheads in five groups. Construction workheads (CW) are the big two: CW01 for general building and CW02 for civil engineering — the main-contractor trades. Construction-related workheads (CR) cover specialist works from piling to demolition. Mechanical and electrical workheads (ME) cover the systems trades: among the most commonly cited are ME01 (air-conditioning, refrigeration and ventilation), ME05 (electrical engineering), ME06 (fire prevention and protection), ME12 (plumbing and sanitary) and ME15 (integrated building services). Trade heads (TR) and regulatory workheads (RW) round out the set, and separate registries exist for facilities management (FM) and for suppliers (SY) — the SY registry covering firms that supply materials and components to public projects. Since 1 June 2025 the CRS has acquired a second function: any firm hiring foreign construction workers must be registered on it, which extends its reach well beyond public-sector tenderers.
The CW ladder: C3 to A1, S$800,000 to unlimited
CW workheads are graded on a seven-step ladder, and each grade carries a tendering limit — the maximum value of public contract the firm may bid for. For the period 1 July 2025 to 30 June 2026 the limits are: C3, S$0.8 million; C2, S$1.6 million; C1, S$5 million; B2, S$16 million; B1, S$50 million; A2, S$105 million; and A1, unlimited. The ladder is steep by design. An A1 general builder can tender for Changi Terminal 5 packages; a C3 firm competes for jobs under S$800,000. The jump from B1 to A2 doubles the ceiling; the jump from A2 to A1 removes it.
The specialist ladder: L1 to L6
CR and ME workheads use a six-step ladder with the same logic: L1, S$0.8 million; L2, S$1.6 million; L3, S$5 million; L4, S$8 million; L5, S$16 million; and L6, unlimited. Some workheads carry only a single grade, which also tenders without limit. The SY supplier registry mirrors the L1–L6 structure. So an M&E contractor holding ME05 at L6 may tender for electrical packages of any size — the specialist equivalent of A1.
What a grade actually certifies
A grade is earned against published criteria in three dimensions: money, track record and people. At the top of the CW01 ladder, A1 requires minimum paid-up capital of S$15 million; a track record of S$150 million of projects in the past three years, of which S$75 million public-sector and S$112.5 million as main contractor; 24 professional and technical staff; plus ISO 45001 or bizSAFE Star safety certification, Green and Gracious Builder accreditation and a GB1 builder’s licence. At the bottom, C3 asks for S$25,000 of capital, S$100,000 of track record over three years and one technically qualified person. The ladder is climbed with audited accounts and completed projects, not marketing.
How a buyer should read a grade
Read the workhead first, the grade second. The workhead tells you what the firm is registered to do; the grade tells you the scale of public work the state trusts it to carry, which is a serviceable proxy for financial standing, project size and organisational depth. The honest caveat: a grade certifies capacity, not quality. It says nothing about whether a contractor is good at your building type, and plenty of excellent niche specialists sit at modest grades because they never chase large public tenders. Use the grade to shortlist for scale; use references and completed projects to choose.
The Singapore Industry Index records BCA-graded firms with their registrations in view. DLM holds unrestricted L6 across ME01, ME05 and ME15, building M&E for data centres and semiconductor facilities. King Wan Construction holds L6 in ME12 plumbing and sanitary — among only six firms at that level — alongside L6 electrical, ACMV and integrated building services. Puretech Engineering carries an L6 electrical registration, wiring MRT depots and the Shaw Tower redevelopment. The wider register is on the Construction & Built Environment hub.