Does the RERA rental index cover Sharjah rents?

No. The RERA rental index and its rent-increase calculator are specific to Dubai and administered by Dubai Land Department; they do not apply to Sharjah. Sharjah's rental relationships are governed by the emirate's own tenancy rules and overseen by the relevant municipal authority, and tenancy contracts there are handled through Sharjah's own registration framework rather than Dubai's Ejari. This means you cannot rely on the Dubai calculator to determine a legal rent increase for a Sharjah property, and the percentage caps in Dubai Decree No. 43 of 2013 do not automatically carry over. To understand your rights in Sharjah, check the current rules with Sharjah Municipality and review what your tenancy contract states about renewal and increases. Disputes in Sharjah are resolved through the emirate's own rent dispute committees rather than Dubai's Rental Dispute Center. Because each emirate sets its own framework and rules can change, verify the current Sharjah position before renewing rather than assuming Dubai's protections apply. You can compare verified UAE tenancy lawyers on LEXAI who handle Sharjah leases to confirm your rights for your specific situation.