How Often Can Rent Be Increased? UK Rent Increase Rules Under the RRA (2026)

There is no statutory cap on the size of a rent increase in England under the Renters' Rights Act 2025. What the Act controls is the process: how often you can increase, how much notice you have to give, and the route the tenant can take if they think your figure is above the market.

Four numbers do most of the work:

Rule	Number
Minimum gap between increases	52 weeks (HA 1988 s.13(2)(b))
Minimum notice period	2 months (HA 1988 s.13(2))
Tribunal application fee for tenants	£47 (SI 2026/485 Sch 1 fee 1.7 — First-tier Tribunal (Property Chamber) Fees (Amendment) Order 2026, in force 1 May 2026)
Maximum the tribunal can set	The proposed rent (RRA 2025 s.7)

The fourth number is the one most landlord-facing content still gets wrong. Under the old s.14, a tribunal could substitute a higher rent if the open-market figure beat the landlord's proposal. The Renters' Rights Act 2025 s.7 repealed that — the new s.14ZB caps the tribunal at the proposed figure. The risk of a tribunal challenge is now strictly one-directional: it can only go down.

What this means for you. If your rent has drifted below market and you want to bring it back, the process route is well-defined: serve a Form 4A, give 2 months' notice, time it 52 weeks after the last increase. The "risk" of a tribunal challenge is no longer two-sided — it can only reduce your proposed figure, never raise it.

Rule 1 — Once every 52 weeks

Under HA 1988 s.13(2)(b), a Section 13 rent increase cannot take effect within 52 weeks of the start of the tenancy or the last s.13 increase. That's the statutory minimum gap.

Two important refinements:

1. The 52 weeks runs from the effective date of the last increase, not the date the notice was served. A common operator error is to serve a fresh Form 4A on the one-year anniversary of the last notice — that's typically too early.
2. There's no exception for "market has moved" or "service costs jumped". The 52-week minimum is statutory; you can't agree your way out of it (informal agreements to increase the rent outside the s.13 process now have no legal effect under new HA 1988 s.13(4A), inserted by RRA 2025 s.6).

If you need to time it precisely, the Rent Increase Calculator takes a tenancy start date and a last-increase date and returns the earliest valid notice date plus the earliest valid effective date.

What about a brand-new tenancy?

For a new tenancy, the 52-week clock starts on the tenancy start date. You can't serve a s.13 notice that takes effect within the first year. The realistic earliest first-increase service window is around month 10 — serve in month 10, notice period runs 2 months, effective date lands at month 12+.

Rule 2 — At least 2 months' notice

HA 1988 s.13(2) requires at least 2 months between the date the notice is served and the date the new rent takes effect. There is no upper limit, but in practice landlords serve at the minimum and pad a few days for delivery uncertainty.

The notice must be served on the prescribed Form 4A — the GOV.UK PDF or a document setting out the same information. Informal letters proposing a new rent have no Section 13 effect on their own. The Form 4A explained guide walks through the form itself.

Rule 3 — The proposed rent must be at or below open market

The Act doesn't define "fair", but it does set a ceiling: under HA 1988 s.14 (as amended by RRA 2025 s.7), if the tenant applies to the First-tier Tribunal (Property Chamber), the tribunal will determine the open-market rent for the property.

What "open market" means in practice:

• The rent a willing landlord might reasonably be expected to obtain on the open market for a comparable tenancy of the same property.
• "Comparable" means similar property type, similar size, similar locality, current asking rents (not historic averages).
• The tribunal looks at current portal listings, recent lettings agency data, and any evidence the parties supply.

If your proposed rent is at or below the local open market, you'll usually be safe at tribunal. If it's noticeably above, the tribunal can substitute its lower figure — and that's the new rent for the rest of the period.

How much should you actually propose?

There's no formula. The decision sits between three constraints:

1. The local market — what comparable properties are letting for right now. Search Rightmove / Zoopla / OnTheMarket for the same postcode + bedroom count + property type. Median of the top 5-10 current listings is a reasonable starting point.
2. The relationship — tenant turnover costs (typically 1-2 months of voids + relet costs) often exceed a modest increase. Aggressive increases sit in tension with retention.
3. Cost recovery — if your costs have risen (rates, insurance, mortgage), document them. They don't change the tribunal's open-market test directly, but they're context for a conversation with the tenant.

The Rent Increase Calculator outputs a tribunal-risk score that combines those three constraints — useful as a sanity check before you commit a figure to the Form 4A.

Rule 4 — The tribunal can only go down

This is the biggest single change under the Renters' Rights Act. Pre-RRA, a tribunal challenge cut both ways — the tenant might have prompted a lower rent, or the tribunal might have decided the market supported a higher figure than the landlord proposed.

RRA 2025 s.7 ended that. The new HA 1988 s.14ZB says the actual rent payable post-tribunal is "the open-market rent, if lower than the proposed rent, and otherwise, the proposed rent." If the tribunal's open-market figure exceeds your proposal, your figure stands.

Two practical consequences:

1. For landlords: the asymmetric risk profile means there's no longer a tactical reason to under-propose. Set the figure at what you'd defend as market rate.
2. For tenants: the £47 tribunal application now has only one direction — down or unchanged. The "tribunal might increase my rent" deterrent of the old regime is gone. Tenant challenges are correspondingly more likely.

For a deeper landlord-defense walkthrough, see the upcoming Rent Increase Tribunal landlord-defense guide (publishes 2026-06-15 — two weeks after this post).

Putting it together — the decision tree

Step	Question	If yes	If no
1	Tenancy has been running ≥52 weeks since start or last increase?	Continue to step 2	Wait — the s.13 route is closed until 52 weeks elapse
2	You can serve at least 2 months before the new rent takes effect?	Continue to step 3	Push the effective date back
3	Your proposed figure sits at or below current local open-market rent?	Serve Form 4A	Recalibrate down — the tribunal route is asymmetric (only down) and a £47 application is friction-free for the tenant
4	Three pre-service requirements met (gas safety, EPC, deposit prescribed-info)?	Serve Form 4A	Fix the prerequisite first; a defective notice fails at tribunal

What the Renters' Rights Act doesn't do

It's worth being explicit about what RRA 2025 didn't introduce, because tenant-side content often implies otherwise:

• No statutory cap on percentage increase. A 20% increase is legal if the resulting figure is at or below open market.
• No statutory link to CPI / RPI / wage growth. Some private rent-control proposals were tabled; none made it into the Act.
• No rent review clause path. Pre-RRA, some assured tenancies included contractual rent-review clauses. Under RRA 2025 s.6 the only valid route to an increase is now Section 13 with Form 4A — contractual rent-review clauses in existing tenancies have no legal effect for rent increases from 1 May 2026.
• No restriction on initial rent. The Act regulates increases, not the starting rent. A new tenancy can be let at whatever rate the market supports.

Related guides

• How to Increase Rent Under the RRA: Form 4A Explained — the prescribed-form-and-notice process detail.
• What Is a Fair Rent Increase Under the RRA? — the market-evidence + relationship framing this post extends.
• Rent Increase Letter Template (UK 2026) — the covering-letter pattern that pairs with the Form 4A.
• Rent Increase Calculator — earliest valid dates + tribunal-risk score.

Sources

• Housing Act 1988 s.13 — the underlying Section 13 mechanism, the 52-week minimum gap, the 2-month minimum notice.
• Housing Act 1988 s.14 — tribunal determination of rent (as amended by RRA 2025 s.7).
• Renters' Rights Act 2025 s.6 — amendments to HA 1988 s.13, including the new s.13(4A) restricting informal increase agreements.
• Renters' Rights Act 2025 s.7 — the new s.14ZA / s.14ZB tribunal-can-only-go-down rule.
• GOV.UK landlord rent-increases guidance — operator guidance on the s.13 procedure.

This is general information about Section 13 rent-increase rules under the RRA and is not legal advice. Particular tribunal applications turn on local market evidence and procedural compliance — for contested increases or unusual tenancies, consult a qualified housing solicitor. Crocker Digital Ltd (Company No. 17008789) and RentersActReady accept no liability for action taken solely on the basis of this article.