The RERA Rent Calculator Explainer: How to Audit Your Landlord's Increase Legally in 2026

When a Dubai landlord serves a rent-increase notice at renewal, the first question a tenant should ask is not whether they can negotiate, but whether the increase is even legal. Dubai caps renewal increases using a public, rule-based formula administered by the Real Estate Regulatory Agency (RERA), the arm of the Dubai Land Department (DLD) that regulates the sector. The tool that applies that formula, the RERA Rent Calculator built on the Rental Index, is the single most important reference point in any renewal dispute. This explainer shows how the calculator works, what the law behind it actually says, and how to audit your landlord's increase step by step in the 2026 renewal cycle.

What the RERA Rent Calculator actually does

The calculator compares your current contractual rent against the average rental value for comparable units in the same area, as published in the RERA Rental Index. From the gap between your rent and that average, it derives the maximum percentage by which your landlord may raise the rent on renewal. The legal basis for those percentages is Dubai Decree No. 43 of 2013, Determining Rent Increases for Real Property. Decree 43 sets the ceiling, the Rental Index supplies the market figure, and together they produce a result under which any increase above it is challengeable.

Two points matter. First, the calculator does not set your new rent automatically; it sets the maximum permitted increase. A landlord can always increase by less, or not at all. Second, the comparison is always to the average for your specific area and unit type, not to a single citywide number, which is why two identical rent figures in different communities can produce very different outcomes.

The five increase brackets under Decree 43 of 2013

Article (1) of Decree No. 43 of 2013 fixes the permitted increase as a function of how far below market your current rent is:

• If your rent is up to 10% below the average, no increase is permitted.
• If your rent is 11% to 20% below the average, the maximum increase is 5%.
• If your rent is 21% to 30% below the average, the maximum increase is 10%.
• If your rent is 31% to 40% below the average, the maximum increase is 15%.
• If your rent is more than 40% below the average, the maximum increase is 20%, which is the absolute cap.

Read one way, the table looks generous to landlords; read another, it is a hard ceiling. Even a tenant paying dramatically below market cannot legally face a renewal jump above 20%. And a tenant whose rent is within 10% of the average has an absolute right to no increase that cycle.

The 90-day notice rule under Law 33 of 2008

The cap only matters if the increase is properly notified. Under Law No. 33 of 2008, which amended the original Law No. 26 of 2007 governing landlord and tenant relations in Dubai, a landlord must serve notice of any intended rent increase at least 90 days before the renewal date, through the proper formal channel. If notice is late, no increase is permitted for that renewal cycle, regardless of where the rent sits against the index. In practical terms, a tenant who receives an increase demand only weeks before renewal is already on solid ground to refuse it for that year.

Why Ejari registration is the gate under Law 26 of 2007

The entire mechanism assumes the tenancy is registered in Ejari, the DLD tenancy registration system, under Law No. 26 of 2007. Without an active Ejari on the unit, the rent-increase framework does not formally apply, and that cuts both ways. The tenant loses the clean, documented protection of the index, and the landlord loses the formal enforcement route. For any audit, the first document to locate is the Ejari certificate; it is the proof that the regulated regime covers your contract.

How to audit your landlord's increase, step by step

1. Confirm Ejari. Pull the current Ejari certificate and check that the registered rent matches what you actually pay. The audit starts from the registered figure.
2. Find the index average. Use the DLD and RERA Rental Increase Calculator with your area, property type, and current rent to obtain the average rental value for comparable units.
3. Compute the gap. Compare your registered rent to that average and apply the Decree 43 of 2013 bracket above to find the maximum permitted increase.
4. Check the notice. Confirm whether the 90-day notice under Law 33 of 2008 was properly served before the renewal date.
5. Decide. If the demanded increase is within the bracket and the notice was valid, the increase is lawful up to that ceiling. If either the percentage or the notice fails, you have grounds to challenge.

When landlord and tenant disagree: the Rental Disputes Centre

If the figures or the notice are in dispute, the matter is not resolved by argument; it goes to the Rental Disputes Centre (RDC), the body attached to the DLD that adjudicates tenancy conflicts. Before the RDC, the landlord bears the burden of proving the market level, normally through the RERA Rental Index lookup, while the tenant may challenge with comparable evidence such as genuinely similar listings or recent signed contracts in the same building. Where the parties cannot agree, the RDC sets the renewal terms. This is also the forum for eviction-notice disputes, deposit recovery, and maintenance conflicts.

Common mistakes to avoid

Tenants most often lose ground by not checking the index before responding, by treating an informal message as formal notice, or by letting the 90-day window pass without objection. Landlords, in turn, frequently overreach by demanding an increase that exceeds the bracket, or by skipping Ejari and then expecting the index to enforce a hike it cannot reach. The calculator exists precisely to remove this guesswork, and using it first usually settles the question.

The bottom line for 2026 renewals

Nothing about the Decree 43 of 2013 brackets or the 90-day rule changed the underlying mathematics; the framework is stable, and that stability is the point. For the 2026 renewal cycle, the discipline is the same: get the Ejari, get the index average, apply the bracket, verify the notice, and escalate to the RDC only when those four checks fail. Do that, and you are auditing your landlord's increase on the terms the law actually sets, rather than on a demand letter's terms.