Introduction — Defects Liability & Post-Occupancy

Section 1

Purpose

Note on JCT editions: JCT has published the 2024 Edition. This guidance cites JCT SBC/Q 2016 clause references; the commercial and payment mechanisms are substantively unchanged in the 2024 edition, but specific clause references should be verified against the contract edition in use on any given project.

Stage 7 — Defects Liability & Post-Occupancy — covers the period between Practical Completion and the issue of the Final Certificate, during which the contractor's Defects Liability Period (DLP) runs, defects are identified and rectified, the Certificate of Making Good Defects (CMGD) is issued, and the building enters post-occupancy operation. The QS's role at this stage focuses on managing the financial and contractual aspects of the defects process, monitoring lifecycle cost performance against NRM3 estimates, conducting post-occupancy evaluation (POE), and ensuring the project's close-out is fully documented.

This guidance note provides the overview for Stage 7 practitioners. It sets out the professional framework — grounded in the RICS Black Book suite, NRM3, and relevant RIBA Stage 7 obligations — and cross-references the detailed topic notes (GN-DL-01 to GN-DL-05). The QS at this stage must balance the active management of the defects process with the forward-looking obligations of post-occupancy evaluation and lifecycle cost benchmarking.

Stage 7 is often undervalued as a 'post-project' administrative stage, but it carries significant professional and financial risks. Errors in DLP management — premature release of retention, failure to notify defects before the DLP expires, or inadequate records of contractor non-compliance — can result in unrecoverable financial losses for clients and professional indemnity exposure for the QS.

Section 2

Key Principles

RICS Defects and Rectification (2nd ed.): the DLP is the contractor's right to return and rectify; the QS must ensure the employer honours this right while protecting the employer's financial position through retention and defect cost assessment.
JCT SBC/Q 2016 Clauses 2.38–2.40: the CA may issue instructions for making good; once all instructed defects are made good, the CA issues the CMGD; the CMGD triggers the second moiety retention release under Clause 4.20.
NRM3 Order of Cost Estimating and Cost Planning for Building Maintenance Works (2022 ed.): provides the framework for lifecycle cost planning and the basis for comparing post-occupancy maintenance costs against pre-contract estimates.
RICS Lessons Learned (1st ed., April 2016): post-occupancy is the stage at which the most valuable lessons learned are available — actual building performance against design intent can now be measured.
RICS Defining Completion (1st ed., August 2024): latent defects remain recoverable within the limitation period (6/12 years) even after the CMGD is issued; the QS should advise the client of continuing obligations.
RIBA Plan of Work Stage 7 (Post Occupancy Evaluation): RIBA requires a formal POE at Stage 7 to assess building performance; the QS contributes the cost performance assessment as part of the POE.

Section 3

Practical Application

Step 1

At the start of the DLP, confirm the DLP end date in writing to all parties; set a mid-DLP review meeting to assess defect progress; set a reminder for the final inspection before DLP expires.

Step 2

Maintain and update the Schedule of Defects throughout the DLP — record all notifications, contractor responses, and sign-offs; the schedule is the primary audit trail for defects management.

Step 3

At mid-DLP, assess outstanding defects and identify any patterns — repeated failures in the same element may indicate a systemic issue (workmanship, materials, or design) requiring specialist investigation.

Step 4

Conduct the pre-DLP-expiry inspection with the CA and design team; ensure all outstanding defects are formally notified before the DLP end date; issue the final defects list promptly.

Step 5

Once all defects are made good, confirm the CA issues the CMGD; instruct the second moiety retention release promptly via a HGCRA-compliant payment notice.

Step 6

Contribute to the Post-Occupancy Evaluation — provide cost performance data: actual maintenance costs in year 1 vs NRM3 lifecycle cost estimate; any significant defects costs; energy costs vs design intent.

Step 7

Review the NRM3 lifecycle cost plan in light of actual post-occupancy performance; update future cost plans for similar projects based on actual data; submit findings to the firm's knowledge base.

Section 4

Common Mistakes to Avoid

Treating Stage 7 as purely administrative — the defects process has significant financial consequences and requires active QS management throughout the DLP.
Allowing the DLP to expire without a final inspection — once the DLP expires and the CMGD is issued, the contractor's contractual obligation to rectify is discharged; late defects must be pursued under common law.
Releasing the second moiety retention before the CMGD is issued — premature release destroys the financial incentive for the contractor to return and make good outstanding defects.
Failing to contribute to the Post-Occupancy Evaluation — POE is now a RIBA Stage 7 obligation and is increasingly expected by clients as part of the QS's professional service.
Not updating lifecycle cost estimates based on actual post-occupancy data — the NRM3 lifecycle cost plan is only valuable if it is calibrated against actual building performance; failing to do so perpetuates inaccurate forecasts.

Section 5

APC Competency & Quick Reference

Contract Practice Level 3 — DLP management, CMGD, retention release
Asset Management Level 2 — lifecycle cost management, NRM3, post-occupancy evaluation

What is the QS's financial role during the Defects Liability Period?

Managing the retention position (ensuring the second moiety is not released prematurely); assessing the cost of defects not rectified by the contractor for potential deduction; monitoring the Schedule of Defects; advising the client on commercial settlement where the contractor refuses to rectify. The QS does not inspect defects — that is the CA's role — but the QS manages the financial consequences.

What is the relationship between the CMGD, the second moiety retention release, and the Final Certificate?

The CMGD (issued by CA under JCT Clause 2.40) certifies that all instructed defects have been made good. This triggers the second moiety retention release (Clause 4.20). After the CMGD and once the Final Account is agreed, the CA issues the Final Certificate (Clause 4.12). The Final Certificate is conclusive unless challenged within 28 days (Clause 4.15).

What is Post-Occupancy Evaluation and why should the QS contribute to it?

POE is the structured assessment of a building's performance in use against the design intent — covering energy use, user satisfaction, maintenance costs, and operational performance. The QS contributes the cost performance element: comparing actual maintenance costs and defect remediation costs in year 1 against the NRM3 lifecycle cost estimate. POE is a RIBA Stage 7 requirement and increasingly part of the QS's professional service offering.

Section 6

Defects Liability & Post-Occupancy Checklist

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Task

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DLP end date confirmed in writing at start of DLP

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Schedule of Defects maintained throughout DLP

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Mid-DLP review conducted and defect patterns identified

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Pre-DLP-expiry inspection held and final defects list issued

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CMGD received before second moiety retention released

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Second moiety retention release payment notice issued

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Post-Occupancy Evaluation contribution prepared (cost performance data)

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NRM3 lifecycle cost plan reviewed against actual post-occupancy data

Section 7

CPD Learning Outcomes

Manage the Defects Liability Period commercially — maintaining the Schedule of Defects, protecting retention, and advising clients on defect cost recovery — in compliance with RICS Defects and Rectification (2nd ed.) and JCT SBC/Q 2016.
Contribute to Post-Occupancy Evaluation by comparing actual cost performance against the NRM3 lifecycle cost estimate and providing year 1 maintenance cost data.
Apply RICS Lessons Learned (1st ed., April 2016) principles to capture Stage 7 project insights and update the firm's lifecycle cost models based on actual post-occupancy performance.

Section 8