What is a CPI-linked rent increase?

A CPI (Consumer Price Index) linked rent increase ties the annual adjustment to the official rate of inflation published by the ONS. Many commercial and some residential leases include a CPI + X% clause, meaning rent rises by the CPI rate plus an additional fixed percentage each year.

What is a Section 13 notice?

A Section 13 notice is the formal legal mechanism for increasing rent on a periodic tenancy in England. The landlord must give at least one month's notice (for monthly tenancies) and the increase can only take effect at least 12 months after the last rent increase or the start of the tenancy.

Can I increase rent during a fixed-term tenancy?

You can only increase rent during a fixed-term tenancy if there is a rent review clause in the tenancy agreement. Without such a clause, you must wait until the fixed term ends. At renewal, you can propose a new rent as part of the new agreement.

What is the Renters' Rights Act and how does it affect rent increases?

The Renters' Rights Act (formerly the Renters' Reform Bill) will make all tenancies periodic and require landlords to use Section 13 notices for all rent increases. It will also give tenants expanded rights to challenge increases at tribunal. The Act is expected to come into force in stages from 2025.

Rent Increase Calculator

Calculate your rent increase.

Work out the new rent using CPI, RPI, a fixed percentage, or market rate. Includes Section 13 notice timing and Renters' Rights Act guidance.

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Rent Details

Current Monthly Rent

The tenant's current monthly rent

Increase Method

CPI rate of 3% sourced from ONS (January 2025)

Additional Percentage

Added on top of the CPI rate (e.g. CPI + 1%)

Tenancy Type

Results

New Monthly Rent

—

Current Rent—

Increase Amount—

Increase Percentage—

Annual Difference—/yr

Renters' Rights Act

The Renters' Rights Act will abolish Section 21 ‘no-fault’ evictions and make all tenancies periodic. Rent increases will only be permitted via Section 13 notices, and tenants will have expanded rights to challenge increases at a First-tier Tribunal. Check the latest guidance before serving notice.

How It Works

Understanding Rent Increases

Index-Linked Increases

CPI and RPI are official inflation measures published by the ONS. Many tenancy agreements tie annual rent increases to these indices, often with an additional uplift (e.g. CPI + 1%). This provides a transparent, objective basis for adjustments.

Fair & Reasonable

Any rent increase must be fair and in line with local market rents. Tenants can challenge excessive increases at a First-tier Tribunal, which will determine the market rent for the property. Aim for increases that reflect genuine market conditions.

Correct Process

For periodic tenancies, use a Section 13 notice with at least 1 month's notice. The increase cannot take effect within 12 months of the last change. For fixed-term tenancies, a rent review clause is needed, or wait until renewal.

Latest Inflation Indices

Reference rates used in this calculator, sourced from the Office for National Statistics.

Index	Rate	Date
CPI (Consumer Price Index)	3%	January 2025
RPI (Retail Price Index)	3.6%	January 2025

Rates sourced from ONS. CPI and RPI are updated monthly. Always check the latest published figures before serving a rent increase notice.

Check fair market rent

Compare your new rent against local market rates.

FAQ

Common questions

There is currently no legal cap on rent increases in England for private tenancies, but the increase must be fair and realistic — broadly in line with local market rents. Tenants can challenge excessive increases at a First-tier Tribunal. The Renters' Rights Act may introduce further protections.

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