RSustain is one of India's few AA1000-licensed assurance providers, authorised to conduct independent sustainability assessments across 11 SASB sectors and 5 jurisdictions. We combine regulatory expertise (SEBI BRSR) with global assurance standards (AA1000AS v3, ISAE 3000) and technology-enabled delivery.
Credible assurance requires independence. RSustain maintains documented conflict registers, enforces cooling-off periods between advisory and assurance engagements, and operates Chinese wall procedures between teams. Our independence protocols meet AccountAbility and IAASB requirements.
From first-time readiness checks to full independent assurance — we meet you where you are.
Not sure if your ESG data is audit-ready? Run our diagnostic first. Validates your BRSR data against 5–9 core KPIs, sector benchmarks, and assurance standards.
Takes 10 minutes. No commitment required.
12-week programme to take your company from compliance gap to BRSR Core assurance-ready. For SEBI-mandated companies ranked in the top 1,000.
For companies ranked 150–1,000 by market cap.
Full AA1000AS v3 assurance engagement conducted entirely online. Type 1 (principles) or Type 2 (principles + data), with High or Moderate assurance levels.
From Rs. 1,49,999. Online pricing calculator available.
SEBI mandates assessment of these 9 ESG attributes under BRSR Core. Our assurance covers all 49 underlying KPIs.
A rigorous, transparent methodology from scoping to final report — designed for efficiency without compromising assurance quality.
Week 1
Conflict register review, scope definition, fee proposal, engagement letter. Independence is verified before any work begins.
Week 2
Assessment plan, evidence requirements, materiality thresholds, team assignment. Every engagement gets a tailored plan.
Weeks 3–6
Document review, data verification, calculation reperformance, evidence quality audit. We examine source data, not just reported figures.
Weeks 5–8
Management interviews, site-level checks (virtual for remote engagements), analytical procedures, stakeholder engagement review.
Weeks 9–10
Preliminary findings shared, management responses documented, factual accuracy confirmed. No surprises in the final report.
Weeks 11–12
Formal assessment report, assurance statement, management letter, board presentation, debrief call. Delivered in formats ready for regulatory filing.
RSustain holds AA1000 assurance licences covering 11 SASB industry sectors, enabling us to conduct independent assessments across virtually every segment of the Indian economy.
RSustain is verified in AccountAbility's global directory of licensed assurance providers.
Start with our free Pre-Assurance Validator, explore the BRSR Core Sprint, or get an instant AA1000 quote.