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Free legal tools for
Singapore construction professionals

Practical calculators and reference tools to help you understand your legal deadlines and rights — before you pick up the phone.

SOPA Deadline Calculator — Tyto LLC
Free tool
SOPA Deadline Calculator
Building and Construction Industry Security of Payment Act (Cap. 30B)
Construction contracts
The contractual date on which the payment claim is to be served this month
Enter the scheduled service date.
If your contract does not specify a date, enter the last date of the current month.
The date on which the payment claim was actually served
Enter the actual service date.
The number of days your contract allows for a payment response. Maximum 21 days under SOPA.
Enter “0” if the contract does not state when a payment response must be provided — the calculator will default to 14 days.

Your SOPA deadlines
Effective date of service of payment claim
Payment response due by
Note: In some contracts, public holidays are not excluded in the computation of the due date for the payment response. Verify the specific terms of your contract.
Start of dispute settlement period
End of dispute settlement period
Date entitled to lodge adjudication application
⚠ Last date to lodge adjudication application
Act on these dates — do not wait
Missing the adjudication application deadline permanently forfeits your right to adjudicate this claim.
Disclaimer: This calculator is provided for general information only and does not constitute legal advice. Results are based on the dates entered and standard SOPA provisions for construction contracts. Individual contract terms, specific facts, and changes in law may affect your deadlines. Always verify your deadlines with a qualified lawyer before taking action. © 2025 Tyto LLC · Advocates & Solicitors · Singapore.
How do SOPA deadlines work?

Under SOPA, the respondent (the party who received the payment claim) must serve a payment response within 14 days of receiving a payment claim under a construction contract, or within the period specified in the contract if shorter.

If the respondent fails to serve a payment response, or serves one for less than the claimed amount, the claimant may lodge an adjudication application. The window to do so opens on the day after the payment response period ends, and closes 7 days later.

Missing the adjudication application window is final. Once it closes, the claimant cannot adjudicate that particular payment claim. A new payment claim may be possible but is subject to separate conditions.

What happens after adjudication?

Once an adjudication application is lodged, an adjudicator is appointed within 7 days. The respondent then has 7 days to lodge an adjudication response.

The adjudicator typically issues a determination within 7 days of the adjudication response, or within 14 days if the adjudicator requests an extension.

If the determination is in the claimant’s favour and the respondent fails to pay, the claimant can apply to the High Court to enforce the determination as a court judgment.

IMPORTANT DISCLAIMER

This calculator provides general guidance only. Exact deadlines depend on the specific terms of your contract and the circumstances of your claim. Do not rely on this calculator alone — always verify your deadlines with a qualified lawyer before taking action.

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Facing an imminent SOPA deadline ?

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