Property & Landlord2 min check

Rent Increase Calculator

Calculate a fair, evidence-backed rent increase using CPI, local market data and statutory limits.

Short answer

Within a fixed-term AST: only if the contract has a rent review clause. Periodic tenancy: use Section 13 notice, max once per year, market rate. Rolling fix: agree by mutual written variation. Renters' Rights Bill (England) will further restrict mid-tenancy increases.

Step 1 of 10%

Calculation method, coverage and version

Inputs used: Current monthly rent, Last increased (years ago), Local market rent for similar property (£/mo), Average annual CPI since last increase.
Calculation approach: The calculator applies the rules and assumptions described in “How it works” to the values you enter. Rounding can cause small differences from an official or provider calculation.
Coverage: Property & Landlord. UK nations, tax treatment, local rules and provider criteria can differ; check the official sources shown below before acting.
Content version: No page-specific review date is currently published. Treat the result as indicative and verify current rules independently.

Not included unless explicitly requested: personal circumstances not entered, provider discretion, future rule changes, professional fees and case-specific exceptions. Read the full calculator methodology.

Primary sources and official verification

Use these official sources to verify current rules before acting. Coverage and dates can differ across England, Scotland, Wales and Northern Ireland.

See the sitewide source policy.

How it works

We check tenancy type (fixed/periodic), last increase date and proposed amount. If the route is Section 13, we set out the 1-month notice (2 months for yearly tenancies) using Form 4.

Worked example

Periodic AST, last increase 18 months ago, proposed rise £950 → £1,000. Serve Form 4 with at least 1 month's notice. Tenant can challenge at First-tier Tribunal if above market rate.

Who should use this

•Landlords planning an increase mid-tenancy
•Tenants checking if a notice is valid
•Letting agents managing multi-property reviews

Common mistakes

×Increasing rent by email instead of using Form 4
×Increasing more than once a year on a periodic tenancy
×Going significantly above local market rate without justification (tribunal risk)
×Forgetting Section 21 cannot be used to force a rent rise

Frequently asked questions

Can rent be increased during a fixed term?▾

Only if the tenancy agreement explicitly includes a rent review clause. Otherwise wait for renewal or periodic.

How much notice for Section 13?▾

1 month for monthly tenancies, 2 months for quarterly, 6 months for yearly.

Can the tenant refuse?▾

They can refer to the First-tier Tribunal which sets the market rent. They can't simply refuse to pay.

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Section 21 Checker →Landlord Compliance →Deposit Protection →