The notice arrived 18 months after handover
The completion certificate was signed. The performance security was due for release. Then the legal notice arrived: a settlement failure on a bridge approach slab, 1.4 km into a stretch the team had vacated 18 months earlier. The contractor's site engineer had left. The maintenance log was a single A4 sheet with four entries. NHAI deducted ₹38 lakhs from the retention money and held the security for another two years.
The contractor's position was not that the defect didn't exist. It was that they hadn't known they were still obligated to inspect that stretch on a quarterly schedule, document the inspection, and certify the pavement condition in writing. DLP construction India requirements go well beyond fixing what breaks.
This piece covers the five DLP obligations that appear most consistently in NHAI EPC contracts and are most consistently missed by the teams responsible for fulfilling them.
What DLP actually requires
The Defect Liability Period in NHAI EPC contracts runs for five years from the Scheduled Completion Date, not the actual completion date. That distinction matters: if you finished six months late and NHAI certified the Completion Certificate at month 6, your DLP clock still started from the Scheduled Completion Date. You are managing the DLP for five years from a date that may already be 6 months behind you when the certificate is issued.
Clause 59 of the NHAI GCC defines the DLP scope. Schedule 3 of the EPC agreement specifies the O&M obligations during the period. Both documents are operational contracts your contracts team needs to keep live for five years after construction ends, not file in a box.
The 5 obligations most commonly missed
1. Quarterly inspection and certification
NHAI EPC contracts require the contractor to inspect the project highway quarterly during the DLP and submit a pavement condition report to the Independent Engineer. The report format is specified in Schedule 3. The IE must certify receipt.
What actually happens: the site team demobilises after the Completion Certificate. The contracts office treats the project as closed. Nobody appoints a DLP-period site representative. Quarterly inspections are not conducted. When NHAI's IE or project director identifies a defect 2 years in, the contractor has no inspection records to show they were monitoring the condition.
Consequence: NHAI assumes the defect existed from day one and has not been rectified. Deduction from retention or performance security under Clause 59.4. If the defect is on a stretch with traffic, NHAI can call in a third-party contractor to fix it and recover the cost from your security deposit.
2. Periodic maintenance milestones
Separate from defect rectification, NHAI EPC contracts typically require the contractor to carry out defined periodic maintenance activities at 3-year and 5-year intervals during the DLP. These include crack sealing, pothole patching, road marking renewal, and in some contracts, a resurfacing strip for high-traffic sections.
These are not triggered by a defect. They are scheduled obligations. The contractor must initiate and complete them within defined windows.
What actually happens: the maintenance team budget is wound down after handover. Nobody is tracking that a 3-year periodic maintenance obligation falls due in month 36. When month 36 arrives, there is no team, no equipment, and no budget allocated. NHAI issues a deficiency notice.
3. Safety and road marking maintenance
Road markings fade faster than the DLP expires. Thermoplastic markings on national highways have a typical field life of 18 to 24 months under Indian traffic and monsoon conditions. A 5-year DLP spans two to three full marking replacement cycles.
NHAI's maintenance manual specifies minimum retroreflectivity values for road markings. If the markings on your stretch fall below standard during the DLP, it is a DLP defect. Not a separate maintenance obligation from NHAI. Your defect to fix.
Most contractors don't know the retroreflectivity specification. Very few measure it. The first they hear of it is a deficiency notice citing the IRC:SP:55 retroreflectivity standard and the NHAI maintenance manual threshold.
4. Defect rectification turnaround times
Defects identified during the DLP are not just "fix it when you can." Clause 59.2 and Schedule 3 specify rectification timelines based on defect category:
- - Safety-critical defects (potholes on carriageway, signage failures): 24 to 48 hours
- Structural defects (drainage failure, embankment movement): 7 to 14 days
- Functional defects (road marking, minor surface distress): 28 to 60 days
Missing a rectification deadline is a separate contractual breach from the defect itself. NHAI can levy delay damages on top of recovering the rectification cost. Contractors frequently rectify the defect and forget to notify the IE within the deadline, which creates a documentation problem: NHAI's records show a missed deadline even when the physical work was done.
5. Documentation and IE sign-off
Every defect, every inspection, and every maintenance activity during the DLP needs: 1. Written notification to the IE before the work starts 2. Photographic record of pre-work and post-work condition 3. Material and quantity records (works contract, invoices) 4. IE certification of completion
Without this documentation trail, NHAI's auditors have no way to verify the DLP obligations were fulfilled. On longer DLPs or large highway projects, NHAI may conduct a DLP Completion Audit before releasing the performance security. If your records are incomplete, the security stays blocked until you reconstruct the documentation. Some contractors never recover it.
How to build a DLP tracking system
The DLP tracking problem is not complicated. It requires a register, not software. The register needs:
- - Project reference and DLP start/end dates
- Quarterly inspection schedule with assigned responsible person
- Periodic maintenance milestones with due dates and budget allocation
- Defect log: date identified, category, rectification deadline, IE notification date, completion date, IE sign-off date
- Road marking retroreflectivity test dates and readings
Keep this register live for 5 years. Assign one person from your contracts team as DLP custodian before the site team demobilises. This is not a project manager role. It is a contracts function that runs parallel to your next project's construction phase.
CivilBolt's project management module includes a DLP tracker linked to your project milestones, so inspection schedules and maintenance due dates appear in your dashboard alongside active project tasks rather than in a separate folder that nobody opens.
What the circulars say about DLP
The MoRTH and NHAI circulars include several that directly affect DLP administration. The January 2026 MoRTH circular on DRB enforceability matters here: if a DLP dispute escalates to a DRB, the DRB recommendation is non-binding. You need the full CCIE and arbitration track to enforce your position. The documentation record from day one of the DLP is your only evidence.
Which of the five obligations above is your current DLP project most likely to miss?