Defect liability period (DLP) in government contracts: meaning, periods and what you must do

The defect liability period is the stretch after a works contract is completed when the contractor still answers for defects in the work. It decides how long your security stays with the buyer, how long you keep a repair crew on call, and what it costs you if a crack or a pothole appears a year later. This guide sets out the periods in CPWD contracts, central rules and highway EPC contracts, what you must do during the DLP, and how your security is released at the end.

What the defect liability period means

The DLP starts when the work is certified complete. During it, if a defect appears that comes from improper materials or workmanship, you must put it right at your own expense once the buyer tells you in writing. That is how CPWD's Clause 17 puts it.

Central rules expect a DLP in all but small contracts. The works manual (para 6.5.5) says contracts for works, and for plant and machinery, above a threshold value should include "a warranty clause/ defect liability clause" requiring the contractor to repair, replace or rectify defective work without charge.

A few related terms:

• Maintenance period. In MoRTH's EPC agreement, the contractor also maintains the road for a "Maintenance Period" that runs alongside the DLP (Article 14). Repairs from usual wear and tear count as maintenance, not defects.
• Warranty period. The works manual pairs the two terms as the "DLP/ warranty period"; for plant and machinery, the obligation is written as a warranty.
• Latent defects. For EPC contracts, the works manual (para 3.2.5) suggests contracts may add a latent defect period beyond the DLP, to cover design or engineering defects found later.
• Defects Liability Certificate (DLC). The works manual (para 7.6.2) says a contract "is not to be treated as completed until a Defects Liability Certificate (DLC) has been issued", once you have met all your obligations.

Defect liability period in CPWD contracts

CPWD's General Conditions of Contract (GCC) 2023, which govern CPWD tenders, deal with defects in two clauses.

Clause 17: defects after completion. If any defect, shrinkage or other fault from defective materials or workmanship appears within 12 months after the completion certificate (final or otherwise), you must make it good at your own expense on receiving written notice. For works costing ₹10 lakh or less, the period is 6 months, except for road works, which keep 12 months. If you don't, the Engineer-in-Charge gets the work done by others and deducts the cost from any money due to you or from your security deposit. The same clause covers damage your workers cause to the building or to nearby property such as roads, pipes, cables and trees.

Clause 16: work not done to specification. If unsound or substandard work or material comes to light, the Engineer-in-Charge can demand in writing, within 12 months of completion (6 months for works of ₹10 lakh or less, except roads), that you rectify or rebuild it, even if it was already passed and paid for. If you don't do it in the time given, you pay compensation at the Clause 2 rate. Clause 2 sets that at up to 1% a month, capped at 10% of the accepted tendered value. The department can also accept the item at a reduced rate, or reject it and get it redone at your risk and cost.

Defect liability period in central government contracts

The Department of Expenditure's Manual for Procurement of Works 2025 doesn't fix one DLP for all works; the contract does. It says:

• EPC contracts: "Defects liability period of two years may be specified" (para 3.2.5).
• Performance security must stay valid for 60 days beyond all your obligations, including the DLP or warranty period, and must be refunded within 60 days of the DLP ending (para 5.1.2).
• Payments don't end your liability. Recording measurements or paying a bill doesn't relieve you of liability for defects noticed until the DLP ends (para 7.5.2).
• Closing the contract. Before the bank guarantee goes back, the user department certifies that support during the DLP has been given, and you may be asked for a "no claim certificate" (paras 7.6.2 and 7.6.4).

State works follow state rules, so read the DLP in your own contract's schedule.

DLP in EPC and HAM road contracts

MoRTH's Standard EPC Agreement for national highways (as updated to 25 April 2022, published by NHAI) sets the DLP in Clause 17.1. It runs from the date of the Completion Certificate:

In a written reply to the Lok Sabha published on 27 March 2025, the road ministry confirmed that in EPC projects the DLP is "5 years for the bituminous pavement works and 10 years for concrete pavement works".

The agreement's other DLP rules:

• Fix defects within 15 days of notice from the Authority or the Authority's Engineer, or within a longer reasonable period they set at your request (Clause 17.2).
• At your own cost where the defect comes from the design, materials or workmanship, poor maintenance during construction, or any other breach (Clause 17.3).
• Maintenance alongside. The Maintenance Period matches the DLP. For flexible pavement over 5 years, you get no maintenance payment in the first year, 0.5% of the contract price in each of years two to four, and 1% in year five. Rigid pavement over 10 years earns 0.25% a year for years one to three, 0.5% for years four to seven and 0.75% for years eight to ten (Clause 14.1).

HAM and BOT projects work differently. The same 27 March 2025 reply says the concession period is "generally 15 years" for Hybrid Annuity Model (HAM) projects and 15 to 20 years for BOT, and the concessionaire must maintain the road through it. Only EPC projects carry a DLP in this sense.

What the contractor must do during the DLP

1. Note the start and end dates the day you get the completion certificate. Under CPWD and MoRTH contracts, the DLP runs from it.
2. Keep a repair team and budget on call. MoRTH EPC gives you 15 days from notice; CPWD expects repairs on written notice, within any time the Engineer-in-Charge specifies.
3. Answer every defect notice in writing. Say when you'll attend, then get the repair inspected and the closure recorded.
4. Keep evidence. Photographs and joint inspection notes at handover help you show that later damage is usual wear and tear, which MoRTH's EPC agreement treats as maintenance rather than a defect.
5. Keep your guarantees alive. Performance security must stay valid 60 days past the DLP under the central rules and MoRTH's agreement. Extend it before it expires.
6. Ask for the final inspection before the DLP ends, so the release paperwork can start on time.

What happens if defects are not fixed

• Someone else fixes it, and you pay. CPWD's Engineer-in-Charge can get the work done by others and recover the cost from your bills or security deposit (Clause 17). Under MoRTH EPC, the Authority recovers the cost plus 20% damages (Clause 17.4).
• The DLP gets longer. MoRTH's agreement extends the DLP until identified defects are fixed (Clause 17.5).
• Your security stays put. MoRTH need not release your performance security until all defects found during the DLP are put right (Clause 7.4).
• Compensation may apply. In CPWD, failing to rectify substandard work in time attracts compensation at the Clause 2 rate (Clause 16).
• Security can be forfeited. The works manual says performance security is forfeited if you breach the contract (para 5.1.2).

Security deposit release after DLP

In CPWD contracts, the security deposit is the money that covers the DLP, because the performance guarantee is returned at completion. Two more CPWD conditions apply before release: no labour complaint pending (Clause 41), and, where part completion certificates were issued, both the final completion certificate and the end of the DLP (amendment of 1 April 2024). MoRTH pays interest at 9% a year if it returns performance security late (Clause 7.4).

The amounts and the bank guarantee option are explained in our guides to performance security and EMD.

Tips for contractors

• Price the DLP into your bid. On a flexible-pavement highway EPC job there's no maintenance payment in the first year, while your team and guarantees have to last all five years.
• Choose materials for the DLP, not just for handover. A 10-year rigid pavement DLP makes cheap shortcuts expensive.
• Keep a register of every contract's DLP end date, security held and guarantee expiry.
• Claim your release on time. CPWD's SOP 5/29 treats a security deposit refund claim as subject to a three-year limitation period from when it falls due.
• Check the DLP before you bid. It's in the contract schedules or the special conditions. Search civil works tenders or NHAI tenders on GovtTenderHub, and open the tender documents to read it.

Common questions

What is DLP full form in construction?

DLP stands for defect liability period, also written defects liability period. It is the time after completion during which the contractor must fix defects caused by its materials or workmanship at its own cost.

What is the defect liability period in CPWD?

12 months from the completion certificate under Clause 17 of GCC 2023. For works costing ₹10 lakh or less it is 6 months, except road works, which keep 12 months.

Is the defect liability period the same as the maintenance period?

Not quite. In MoRTH EPC contracts the maintenance period runs for the same years as the DLP, but maintenance covers routine upkeep and wear and tear, paid for separately, while DLP covers defects you must fix free.

What is the DLP for national highway EPC projects?

5 years for flexible or bituminous pavement, and 10 years for rigid or concrete pavement, perpetual pavement, major bridges, tunnels and new technology, under MoRTH's Standard EPC Agreement. Some renewal works carry 3 years.

Does a HAM project have a defect liability period?

Not in the EPC sense. A HAM concessionaire maintains the highway throughout the concession period, which the road ministry says is generally 15 years.

When is the security deposit released after DLP?

In CPWD, after 12 months from the completion certificate (6 months for works up to ₹10 lakh, except roads) or when the final bill is passed, whichever is later. Under the central works manual, retention and performance security come back within 60 days of the DLP ending.

Can the defect liability period be extended?

Yes. MoRTH's EPC agreement extends it until identified defects are fixed; check your own contract for similar terms. If you get an extension of time for the work itself, extend your guarantees too.