How to Increase Rent in Ireland Legally in 2026
In Ireland, rent increases are governed by RPZ rules, CPI caps, and a mandatory 90-day notice requirement. Rent can only be reviewed once every 12 months. This guide explains the exact process, how to calculate the maximum permitted increase, and the mistakes that make increases invalid.
CPI rate or 2% max
Once per 12 months
90 days minimum
National from March 2026
Step-by-Step: How to Increase Rent Legally in Ireland
Follow these steps in order. Skipping any step — particularly the 90-day notice — makes the rent increase unenforceable.
Confirm the national rent control cap applies
From 1 March 2026, national rent control applies to all private residential tenancies in Ireland. The maximum annual increase is the lower of 2% or the CPI rate for the relevant period. There is no longer a distinction between RPZ and non-RPZ properties — the cap applies to all tenancies.
Calculate the maximum permitted increase
For all private tenancies subject to national rent control, the maximum increase is the lesser of 2% per year or the CPI (Consumer Price Index) rate for the relevant period. Use TenantSync's Rent Increase Calculator to compute the exact maximum increase based on your current rent and the relevant CPI figure from the RTB.
Confirm 12 months have passed since the last review
Rent can only be reviewed once every 12 months. If you increased rent less than 12 months ago, you cannot implement another increase until the 12-month anniversary of the last change.
Prepare a written Notice of Rent Review
You must serve a formal written Notice of Rent Review on the tenant. The notice must state the new proposed rent, the date from which it will apply, and confirm that the increase complies with the national rent control rules. The notice must be served at least 90 days before the new rent takes effect.
Serve the notice correctly
The Notice of Rent Review must be served by hand, post, or email. Keep a copy and evidence of service in all cases.
Wait 90 days before the new rent applies
The new rent cannot take effect until at least 90 days after the notice is served. Even if the tenant does not object, the landlord must wait the full 90 days. The new amount only applies from the date stated in the notice.
Is My Property in an RPZ?
The following areas are currently designated Rent Pressure Zones. Always verify against the RTB\'s official map at rtb.ie, as designations can change.
Area | Status | Notes |
|---|---|---|
All private residential tenancies | National Rent Control | From 1 March 2026, national rent control applies to all private tenancies. The cap is the lower of 2% per year or CPI. Rent Pressure Zones (RPZs) were abolished on 1 March 2026. |
Previous RPZ areas (until 28 Feb 2026) | Historical | Dublin City, Cork City, Galway City, Limerick City, Waterford City, and designated commuter towns were RPZs until 28 February 2026 when they were abolished. |
Common Mistakes That Make a Rent Increase Invalid
Giving less than 90 days' notice
A Notice of Rent Review served with less than 90 days before the effective date is void. The rent increase cannot take effect on that date.
Reviewing rent within 12 months of the last change
If the rent was changed less than 12 months ago, any new Notice of Rent Review served before the 12-month anniversary is invalid.
Exceeding the CPI cap in an RPZ
Applying an increase above the permitted CPI rate (maximum 2%) is a breach of the Residential Tenancies Act and can result in an RTB dispute and repayment order.
Not putting the notice in writing
A verbal agreement to increase rent is not a valid Notice of Rent Review. The notice must be in writing, signed, and served correctly.
Setting new-tenancy rent above RPZ limit
In an RPZ, when a new tenancy begins, the rent cannot exceed the previous rent plus the permitted CPI increase. Many landlords incorrectly reset to market rate between tenancies.
Incorrectly claiming a new-build or refurbishment exemption
Exemptions from RPZ caps are narrowly defined. Claiming an exemption without meeting the legal criteria is a breach and can result in enforcement action by the RTB.
National Rent Control: March 2026
From March 2026, rent increase restrictions apply nationally — not just in designated RPZs. If your property is outside a current RPZ, you may still be subject to a rent cap under the new national rules. Check the RTB website and the latest statutory instruments for the specific cap that applies to your property. The 90-day notice requirement and 12-month review cycle apply nationally.
Tools That Help With Rent Increases
RPZ Rent Increase Calculator (free, no login)
Enter your current rent and property location to instantly calculate the maximum permitted rent increase under RPZ rules using the latest CPI figures.
Rent review cycle tracking (TenantSync platform)
TenantSync tracks the 12-month review clock for each tenancy and alerts you when you are eligible to serve a new Notice of Rent Review.
Notice of Rent Review generation
Generate a compliant written Notice of Rent Review from your tenancy data, with the correct 90-day effective date calculated automatically.
Stop doing RTB admin by hand
TenantSync auto-calculates your rent cap, tracks every RTB registration and renewal deadline, and reconciles rent straight from your bank. From €20/month for up to 10 properties.
Frequently Asked Questions: Rent Increases in Ireland
How much can a landlord increase rent in Ireland in 2026?
From 1 March 2026, national rent control applies to all private residential tenancies in Ireland. Rent increases are capped at the lower of 2% per year or the CPI (Consumer Price Index) rate. Rent Pressure Zones (RPZs) were abolished on 1 March 2026 and replaced by this national system. Use TenantSync's free Rent Increase Calculator to compute the exact maximum increase for your property.
What is an RPZ (Rent Pressure Zone) in Ireland?
A Rent Pressure Zone was a designated area where annual rent increases were capped. RPZs were set by the RTB based on areas with high rents and low vacancy rates. Dublin, Cork, Galway, and many commuter towns were designated RPZs. Rent Pressure Zones were abolished on 1 March 2026 and replaced by a national rent control system applying the same cap to all private residential tenancies in Ireland.
How often can a landlord increase rent?
Rent can only be reviewed once every 12 months. A landlord cannot serve a Notice of Rent Review if it has been less than 12 months since the last rent change. The 12-month period runs from the date the previous rent change took effect, not from when the notice was served.
How much notice must a landlord give before a rent increase?
A landlord must serve a written Notice of Rent Review at least 90 days before the new rent is due to take effect. This 90-day minimum applies to all private tenancies — RPZ and non-RPZ. A shorter notice period makes the notice invalid.
What is the CPI and how does it affect rent increases?
CPI stands for the Consumer Price Index — the inflation measure published by the Central Statistics Office (CSO). From 1 March 2026 the RTB uses the All-Items CPI as the official inflation measure for rent reviews, replacing the Harmonised Index of Consumer Prices (HICP) used previously. The maximum allowable rent increase is the CPI rate for the relevant period, capped at 2%. If CPI is 3%, the cap is 2%. If CPI is 1.5%, the cap is 1.5%. The RTB publishes the applicable CPI figures on their website.
Can I increase rent above market rate if moving to a new tenant?
From 1 March 2026, a market rent reset is permitted when a new tenancy begins in specific circumstances: if the previous tenant left voluntarily, breached their obligations, or the property no longer suited their needs; at the end of a 6-year tenancy cycle; or if the property has not been let for 2 or more years. A market rent reset is not permitted if the previous tenancy ended due to a no-fault termination by the landlord (sale, family occupation, refurbishment, or change of use).
What are the exemptions from the national rent increase cap?
Under the national rent control in force from 1 March 2026, new apartments where construction commenced after 10 June 2025 are subject to a CPI-only cap (the 2% ceiling does not apply). Substantially refurbished properties may also qualify for different treatment. Evidence of compliance with planning and building regulations is required. Incorrectly claiming an exemption is a breach of the Residential Tenancies Act.
What happens if a landlord overcharges rent?
A tenant who believes they are being overcharged can refer the matter to the RTB. If the RTB finds a breach of the national rent control rules, it can issue a determination order requiring the landlord to repay excess rent and reduce the rent to the permitted level. The RTB can also sanction landlords for non-compliance.
Does TenantSync help with rent increase calculations?
Yes. TenantSync includes a free Rent Increase Calculator that computes the maximum permitted rent increase based on the current rent and the applicable CPI figure from the RTB. The platform also tracks the 12-month review cycle and generates compliant Notice of Rent Review documents.
What is the national rent control introduced in March 2026?
From 1 March 2026, Rent Pressure Zones (RPZs) were abolished and replaced by a national rent control system applying to all private residential tenancies in Ireland. The cap is the lower of 2% per year or the CPI (Consumer Price Index) rate. New apartments where construction commenced after 10 June 2025 are subject to a CPI-only cap. See the latest guidance at rtb.ie/rental-reforms.
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