Technical Sanction (TS)

Technical Sanction (TS) is the formal certification by a government's technical authority, typically a Chief Engineer or Superintending Engineer, that a proposed construction project's design, drawings, specifications, and detailed estimates are technically sound, complete, and executable within the estimated cost. TS is mandatory for works procurement and must be obtained before the NIT is published.

What is Technical Sanction in government procurement?

TS fills the technical validation role that Administrative Approval (AA) does not. AA says "yes, we want to build this project and have the budget." TS says "the design is correct, the estimates are realistic, and the project can be built as specified."

The Technical Sanction process involves:

Drawing review: All architectural, structural, civil, electrical, plumbing, and HVAC drawings are reviewed for technical correctness, code compliance (IS codes, NBC, IRC, BIS standards), and internal consistency. A structural design approved at Detailed Project Report stage may need updating by the time TS is sought, based on site investigation findings.

Estimate verification: The detailed estimate (BOQ quantities derived from drawings, priced at SoR/DSR rates) is verified for mathematical accuracy and completeness. Hidden items (temporary works, testing, quality assurance) must be included.

Specification alignment: Specifications referenced in the BOQ must match the applicable CPWD/MoRTH specifications and IS codes. Mismatches are corrected at TS stage.

The authority competent to grant TS differs from AA. TS is an engineering authority, the Chief Engineer of CPWD's regional office, the Chief Engineer of a state PWD, or the Chief Engineer (Roads) for highway projects. The monetary limit of TS authority is typically higher than AA authority because the technical review is within the engineering chain of command.

For large projects, TS may itself be tiered: detailed estimates are sanctioned at one level, with final design documents receiving additional technical approval from a higher-level engineer or a specialist committee.

Why it matters for bidders

Like AA, TS is an internal government process invisible to bidders in the tender documents. But its quality directly affects the NIT: poor-quality TS, where the estimate is based on outdated rates, the drawings are incomplete, or the specifications are inconsistent, results in tenders with ambiguous BOQ items, incorrect quantities, or missing scope items. These problems surface as questions at pre-bid meetings, scope disputes during execution, and claims for extra items.

A pattern of large variation orders (contract cost increases significantly above the original NIT value) on a department's projects is often a symptom of inadequate TS, the original estimate was not well prepared, and the BOQ quantities underestimated the actual work required.

From a bidder's risk perspective, when a BOQ has many items with small quantities and the scope description is vague, this suggests the TS was granted on a preliminary design. Actual quantities during execution may be much higher, which works in the contractor's favor on item-rate contracts (more work means more payment) but can cause project timeline and cash flow disruption.

Example

CPWD is asked to design and construct a government office complex in Pune. After the AA is obtained, the SE (Civil) and SE (Electrical) of CPWD's Pune regional office undertake TS. They review the structural drawings prepared by the consultant, verify that the RCC design conforms to IS 456 for the Pune seismic zone, check that the electrical load calculations match the National Building Code requirements, and verify the BOQ quantities against the approved drawings. They also check that the per-item rates in the estimate use the current DSR (2024) with the correct Pune location factor applied. TS is granted on Rs 28.5 crore. The NIT is then published with this as the estimated cost.

Key rules / thresholds

• TS must be obtained before NIT publication for all works contracts.
• TS authority is the competent technical officer (Chief Engineer or equivalent), different from AA authority.
• Revised TS is required when scope changes during execution result in cost increases beyond a specified percentage of original TS amount.
• TS covers the technical completeness of the design and estimate; it does not substitute for AA (which covers administrative and financial sanction).