Services · Civil and Infrastructure Testing
Structural Audit Under Maharashtra Clause 77
The deliverable is a Form A or Form B structural-audit certificate with a repair and rehabilitation programme under the CPWD framework, built on visual survey, GPR, UPV, half-cell potential, cover meter, and verification cores. TCR has completed 1,200+ structural audits.
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Overview
TCR Engineering Services Pvt. Ltd., NABL ISO/IEC 17025:2017 accredited and based in Navi Mumbai, conducts structural audits under Maharashtra Clause 77 for buildings older than 30 years, combining visual survey, non-destructive evaluation and repair consultancy, and has completed 1,200+ structural audits across India.
The Maharashtra Clause 77 mandate covers structural audit of buildings older than 30 years (and recommended for buildings older than 15 years) in cities under the Maharashtra Municipal Corporations Act. The Mumbai building stock alone runs to 30,000+ buildings within the audit-mandate scope.
Overview
The audit workflow combines visual condition survey, GPR for rebar and embedded utility location, UPV per IS 13311 Part 1 for concrete homogeneity, rebound hammer for surface hardness correlation, half-cell potential per ASTM C876 for corrosion likelihood, cover meter for clear cover verification, drone capture for high-rise façade and roof access, and core extraction for verification compressive strength.
- Visual: condition survey of the structure.
- Rebar and utilities: ground-penetrating radar for location, cover meter for clear-cover verification.
- Concrete quality: ultrasonic pulse velocity per IS 13311 Part 1 for homogeneity, rebound hammer for surface hardness correlation, core extraction for verification compressive strength.
- Corrosion: half-cell potential per ASTM C876 for corrosion likelihood.
- Access: drone capture for high-rise façade and roof.
- Output: a Form A or Form B structural-audit certificate with repair-and-rehabilitation recommendations under the CPWD framework.
- The statutory clock: every five years for buildings aged 15 to 30 years, every three years above 30.
The output is a Form A or Form B structural-audit certificate with repair-and-rehabilitation recommendations under the CPWD framework.
Under the mandate, a housing society must commission a structural audit once every five years for buildings aged 15 to 30 years and once every three years for buildings older than 30 years. The audit establishes the present condition and expected residual life of the structure, identifies areas that need immediate repair, satisfies the statutory requirements of the municipal authority, and sets the preventive and corrective programme, repairs and retrofitting included, that extends the building's life. TCR delivers the audit in three parts.
Part A: Visual Inspection
Visual inspection of the structure from inside and outside, member by member, with a study of the architectural, RCC, and structural drawings where available and a full photographic survey.
- Coverage: inside and outside, member by member, with a full photographic survey.
- Drawings studied: architectural, RCC and structural, where available.
- Structure recorded: the load transfer system and the structural framing system.
- Defects recorded: structural deficiencies, settlement, cracks in RCC members and in masonry or plaster, leakages, and defects in non-structural elements.
- Loads: loads on the structure.
- Output: the locations that require detailed investigation in Part B.
The survey captures the load transfer system, the structural framing system, structural deficiencies, settlement, cracks in RCC members and in masonry or plaster, leakages, loads on the structure, and defects in non-structural elements, and identifies the locations that require detailed investigation and non-destructive testing.
Part B: Non-Destructive Evaluation
The real strength and quality of concrete cannot be established by eye. The locations identified in Part A are therefore tested with the non-destructive methods described in the audit workflow above to determine the present strength and quality of the concrete members.
Part C: Repair and Rehabilitation Consultancy
The audit closes with a consolidated report covering interpretation of the visual and NDT results, diagnosis and root cause analysis of the observations, a repair and rehabilitation scheme to make the structure durable and healthy, technical specifications and draft tender documents for the repair work, cost estimates, scrutiny of tenders, periodic inspection of the repair work, and issue of the Structural Stability Certificate on completion of the job.
- Interpretation of the visual and NDT results
- Diagnosis and root cause analysis of the observations
- A repair and rehabilitation scheme to make the structure durable and healthy
- Technical specifications and draft tender documents for the repair work
- Cost estimates and scrutiny of tenders
- Periodic inspection of the repair work
- Issue of the Structural Stability Certificate on completion
Documents
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Frequently asked questions
Which buildings need a structural audit under Maharashtra Clause 77?
Under the Maharashtra Municipal Corporations Act, buildings older than 30 years must undergo a structural audit, and audit is recommended for buildings older than 15 years. Housing societies must commission an audit once every five years for buildings aged 15 to 30 years and once every three years thereafter.
What does the audit include?
TCR delivers the audit in three parts: Part A visual inspection member by member with photographic survey, Part B non-destructive evaluation using GPR, UPV per IS 13311 Part 1, rebound hammer, half-cell potential per ASTM C876, cover meter and core extraction, and Part C repair and rehabilitation consultancy with cost estimates.
What certificate does the audit produce?
The audit output is a Form A or Form B structural-audit certificate with repair-and-rehabilitation recommendations under the CPWD framework. On completion of the recommended repair work, which TCR can specify, tender and periodically inspect, a Structural Stability Certificate is issued for submission to the municipal authority.
How experienced is TCR in structural audits?
TCR has completed 1,200+ structural audits across India and operates as a NABL ISO/IEC 17025:2017 accredited laboratory (certificate NABLT0726MH18640) from Navi Mumbai. The audit practice sits within a civil testing capability that has also inspected 500+ bridges across the country.