Dublin Rent Increase 2026: What's Legal and What's Not

You open the post on a Tuesday morning, see an envelope from your landlord, and your stomach drops a little. Then you read it: your rent is going up. Maybe a hundred euro. Maybe three hundred. The letter is very official-looking. There's a date. There's a new figure. And somewhere in the back of your head a voice is asking,is this actually allowed?

Here's the good news: Ireland has some of the clearest rules in Europe about exactly what a landlord can and cannot do when it comes to rent increases. The bad news is that most tenants don't know those rules, and some landlords are counting on that. This guide will sort you out.

The Basics: Every Rental in Dublin Is Now an RPZ

RPZ stands for Rent Pressure Zone, and as of June 2025, the entire country is one. Every single private tenancy in Ireland is now subject to rent control rules,there's no patchwork of "is my area included" to worry about anymore. If you're renting in Dublin, the rules apply to you, full stop.

What those rules say is simple: your landlord can only increase your rent once every 12 months, and that increase cannot exceed 2% per year OR the rate of inflation (as measured by the Consumer Price Index), whichever is lower. So in a year where inflation runs at 1.5%, the cap is 1.5%. In a year where inflation hits 4%, the cap is still 2%. The ceiling is always 2%, no matter what.

There's one important update from March 2026 worth knowing: the inflation measure switched from the Harmonised Index of Consumer Prices (HICP) to the Consumer Price Index (CPI). The practical difference is small for most tenants, but it's worth knowing the terminology in case you're comparing older notices to newer ones.

What the Notice Must Contain

Your landlord isn't just allowed to send you a text saying the rent is going up. There's a proper process, and if they skip any part of it, the increase doesn't count.

Here's what a valid rent review notice requires.

90 days' notice, minimum. The new rent cannot take effect until at least 90 days after you receive written notice. Not 60. Not 30. Not a quick WhatsApp. Ninety days, in writing.

The notice must go to the RTB on the same day. This is the bit most people don't know. Landlords are legally required to send a copy of the rent review notice to the Residential Tenancies Board on the exact same day they send it to you. If they don't, the notice is invalid and the increase doesn't apply,even if the maths is otherwise correct.

The calculation must be shown. The notice has to include a printout from the RTB Rent Calculator showing exactly how the new rent was calculated. It also has to reference three comparable properties from the RTB Rent Register to show the new rent is not above market rate.

If your notice arrived without these things, it's not legally compliant. Keep it. You'll need it if this goes further.

Photo: Unsplash / Valerie

A Real Example: Is This Increase Legal?

Let's say your rent is currently €1,800 per month. Your landlord writes to you in May 2026 saying the new rent will be €2,000 from August,a €200 increase. Is this legal?

First, work out the percentage. €200 on €1,800 is an 11.1% increase. That is nowhere near legal under RPZ rules. The absolute maximum allowed would be 2% of €1,800, which is €36 per month, bringing the rent to €1,836. If the current CPI inflation rate is below 2%, the cap would be even lower than that.

So in this case: no, the €2,000 demand is not legal, and you do not have to pay it.

Now let's flip it. Your rent is €1,800 and the landlord wants €1,820. That's a 1.1% increase. If inflation is running at 1.5% or above, this is within the legal limit. As long as the notice was served correctly with 90 days' notice, the RTB copy, and the calculator printout, this one is valid.

The RTB has a free rent calculator tool on their website. Type in your current rent, the date it was last set, and your area, and it will tell you exactly what the legal maximum increase is for your tenancy. Use it before you do anything else.

What to Do If the Increase Is Illegal

Step 1: Don't panic, and don't pay the new amount yet. You have 90 days before it even kicks in, and an invalid notice means no new rent applies at all. Keep paying your current rent.

Step 2: Write to your landlord. A polite, short letter or email is usually enough. State that you've reviewed the notice and it appears to exceed the legal RPZ limit (and/or wasn't properly served), and ask them to confirm the correct amount or reissue the notice in compliance with the Residential Tenancies Act. Keep a copy of everything.

Step 3: Contact Threshold. Threshold is Ireland's national housing charity and they offer free advice to private tenants. You can call them on 1800 454 454 or use their online chat. They've seen every version of this situation and they'll tell you exactly where you stand.

Step 4: File a dispute with the RTB. If your landlord won't back down, you can take a formal dispute to the Residential Tenancies Board. This is free to do, and the RTB has the power to order a landlord to refund overpaid rent and stick to the legal limit going forward. You don't need a solicitor and you don't need to be confrontational,it's a formal process that protects you.

One thing worth noting before you sign your next lease: HomeScout's AI contract review reads your tenancy agreement and flags non-compliant rent review clauses before you sign anything. Catching a dodgy rent review clause upfront is a lot less stressful than disputing an illegal increase 12 months in.

Exemptions: When the Cap Doesn't Apply

The rules are strict, but there are a few legitimate situations where a landlord can set rent outside the normal cap.

New-to-market properties. If a property hasn't been rented out in the last 24 months (or 12 months for a protected structure), the landlord can set the initial rent at market rate. This is for genuinely empty properties re-entering the rental market, not a loophole to exploit. Importantly, from March 2025, a landlord cannot use a no-fault termination (like an eviction claiming they want to sell) to then re-set rent to market rate for a new tenant. That route is now closed.

Substantial renovation. If a landlord has done a permanent extension that increases floor area by at least 25%, or has improved the Building Energy Rating (BER) by at least seven levels, they can re-set the rent after those works. They must provide supporting documents,old and new BER certificates, planning permissions, whatever applies. "I painted the kitchen" does not qualify.

Newly built apartments (post-June 2025). This one matters if you're looking at a brand-new development. Properties in purpose-built blocks where construction commenced after 10 June 2025 are not subject to the 2% cap. Their rent increases follow CPI with no ceiling. It's a concession to developers to get more supply built, and it only affects a small slice of the market right now,but if you're renting in one of those new schemes, be aware the rules are different.

The New Market Rent Rules (March 2026)

From 1 March 2026, there's a broader reform in effect for new tenancies. Landlords setting initial rent must now confirm in writing that the rent is not above market rate, and back that up with three comparable listings from the RTB Rent Register. This applies to new tenancy agreements created from this date,it doesn't change the rules for existing tenancies, which remain protected by the RPZ cap.

For tenants starting fresh in the Dublin rental market in 2026, these rules give you something to push back against if the advertised rent looks inflated. Ask the landlord or letting agent for the comparables they used. They're required to have them.

If you want to see what similar properties are actually renting for before you commit, HomeScout's search pulls live listings across Dublin, so you can check comparable rents in a neighbourhood before signing. It's the quickest way to sense-check whether what you're being offered is in the right ballpark,and that information is worth a lot when you're sitting across from a letting agent.

For more context on what's typical across Dublin's neighbourhoods, the average rent guide for Dublin 2026 gives area-by-area breakdowns that are worth reading before any negotiation.

Your Rights in Summary

The Dublin rental market is competitive and it moves fast, but the law is firmly on your side when it comes to rent increases. Here's the short version of what you need to remember.

Your landlord can only increase rent once per year. The increase cannot exceed 2% or CPI inflation, whichever is lower. They must give you 90 days' written notice. They must send a copy to the RTB on the same day. The notice must include a calculator printout and three comparable properties. If any of these steps are missed, the increase is invalid.

If something looks off, use the RTB calculator to run the numbers, write to your landlord calmly, and escalate to Threshold or the RTB if needed. You don't have to just accept it because the letter looks official.

For a broader look at what your rights cover beyond rent increases, the tenant rights guide for Ireland 2026 covers deposits, repairs, notice periods, and everything else you need to know.

Sources: RTB rental law changes from 1 March 2026, Citizens Information,rent increases in private rented housing, RTB Rent Calculator, RTB guide to rent review notices