Fair Rent Increases UK 2026: How Much Can You Raise Rent?

A landlord in England can propose any rent increase they like, but since 1 May 2026 it must be done by serving a Form 4A Section 13 notice, giving at least two months' notice, and no more often than once every 52 weeks. There is no statutory cap on the amount. If the tenant challenges it, the First-tier Tribunal will set the rent at the lower of your proposed figure and the open market rent. ONS data puts average UK rent inflation at 3.3% in the 12 months to June 2026.

The short version:

• Method: a Section 13 notice on the prescribed Form 4A. Rent review clauses in tenancy agreements have had no effect since 1 May 2026.
• Notice: at least two months, whatever the rent payment frequency.
• Frequency: once every 52 weeks, and never in the first 52 weeks of the tenancy.
• Cap: none in England. The practical ceiling is the open market rent, because that is what a tribunal will hold you to.
• Tenant's right: apply to the First-tier Tribunal before the new rent starts. The tribunal cannot set the rent higher than you proposed.
• A defensible figure right now: roughly 3%, tested against local comparable rents rather than against a national average.

How much can you increase rent in the UK?

There is no legal maximum. Nothing in the Housing Act 1988 or the Renters' Rights Act 2025 caps the percentage a private landlord in England can propose.

What limits you in practice is the open market rent. Under section 14ZB of the Housing Act 1988, if the tenant challenges your increase, the tribunal sets the new rent at the lower of the rent you proposed and the open market rent for that property. So an above-market proposal is not unlawful. It is simply unenforceable the moment the tenant applies.

Open market rent means the rent the property could reasonably be expected to achieve if it were let today on the open market, on a tenancy with the same periods and the same terms other than the rent. The tribunal disregards three things: the fact that a sitting tenant is already there, any improvements the tenant has made themselves, and any reduction in value caused by the tenant breaching the tenancy.

That makes comparable evidence the whole argument. Two early tribunal decisions show how narrow the margin usually is. In Usher v Theodore Stevenage Limited (CAM/26UH/MRA/2026/0004, 17 July 2026) the landlord proposed £1,675 against an existing rent of £1,282, and the tribunal determined £1,550. In Segal v Koroglu (LON/00AM/MNR/2026/0378, 10 July 2026) the landlord proposed £1,700 and the tribunal determined £1,650, deducting £50 for a missing room thermostat and the condition of the windows.

A separate decision reported in July 2026, involving build-to-rent landlord Get Living, is worth knowing about for a different reason: the tribunal gave less weight to the tenant's advertised comparables because asking prices do not show what rent was actually achieved. Achieved rents beat listings as evidence, in both directions.

How often can you increase the rent?

Once every 52 weeks, and not at all during the first 52 weeks of the tenancy.

The rule is counted in weeks, not in calendar months, and not from the tenancy anniversary. Section 13(2) of the Housing Act 1988 requires that the new rent cannot take effect earlier than 52 weeks after the date the last increase took effect, or 52 weeks after the first period of the tenancy began if you have never increased it. GOV.UK describes this as "once a year", which is a fair simplification but drifts against the calendar over time.

The safe practice is to work from the last effective date plus 52 weeks, not from the anniversary of the tenancy. A landlord who diarises "1 June every year" will eventually serve a notice a few days early and invalidate it.

One transitional trap. If you increased the rent using a contractual rent review clause before 1 May 2026, a Section 13 notice served after that date cannot propose a new rent taking effect within 52 weeks of that earlier increase. An increase that was agreed before 1 May 2026 but was due to take effect after it does not apply at all.

How much notice do you have to give for a rent increase?

At least two months, for every periodic tenancy, regardless of whether rent is paid weekly, monthly, quarterly or annually.

This changed on 1 May 2026. The old regime required one month for weekly and monthly tenancies and six months for annual ones. Those figures no longer apply, and a notice built on them will not be valid. The notice period runs from the date the notice is given to the date the new rent is due to start, and the start date has to fall at the beginning of a rental period.

What form do you use to increase the rent?

Form 4A. Its full title is "Landlord's notice proposing a new rent for assured tenancies in the private rented sector", and it is prescribed for private tenancies by regulation 3(1)(d) of the Assured Tenancies (Private Rented Sector) (Prescribed Forms and Transitional Provisions) (England) Regulations 2026.

Do not use Form 4. Form 4 still exists, but since 1 May 2026 it is the social housing form. Serving Form 4 on a private tenancy is the most common way to invalidate an otherwise sensible increase. Download the current version from the GOV.UK assured tenancy forms page rather than from a template site, because the prescribed version changes.

Our guide to completing and serving a Section 13 notice walks through the form field by field.

What makes a rent increase notice invalid?

Any one of these will do it, and the consequence is the same: the old rent continues and you start again.

• Wrong form. Form 4 instead of Form 4A, or a letter or email instead of the prescribed form.
• Too little notice. Anything under two months.
• Too soon. Less than 52 weeks since the last increase took effect, or inside the first 52 weeks of the tenancy.
• Relying on a rent review clause. These have had no effect since 1 May 2026. Section 13(4A) allows rent to rise only by a Section 13 notice, a tribunal determination, or a written agreement following a tribunal determination for a lower rent.
• A start date mid-period. The new rent has to begin at the start of a rental period.
• Incorrect tenancy details. Wrong names, wrong address, or a rent figure that does not match what you intend to charge. A tribunal will sometimes forgive a minor slip, as it did over a tenancy start date discrepancy in Usher, but that is discretion rather than entitlement.

What is a fair rent increase in the UK in 2026?

Around 3% is the figure that stands up to scrutiny at the moment, tested against comparable local rents rather than applied as a blanket percentage.

That number comes from triangulating three things. ONS puts private rent inflation at 3.3% in the 12 months to June 2026. CPI inflation is 2.6% and CPIH is 2.8%. Private sector regular pay is growing at 2.9%. An increase in that range tracks both the market and your tenant's ability to pay, which is the practical definition of fair.

Note how much this has moved. Rent inflation peaked at 9.0% in 2024 and has roughly halved. Guidance written even a year ago recommending 4% to 6% now reads high.

Is 5% a fair rent increase?

It is lawful, and it is defensible in a market that has genuinely moved that far, but it is above the current national average of 3.3%. If you go to 5% you should be able to produce two or three comparable local lettings at the new figure. In Wales, where rent inflation is running at 4.9%, 5% is closer to the market than it is in Scotland, where it is 1.3%.

Is a 10% rent increase legal in the UK?

Yes, it is legal. There is no cap. But 10% is roughly three times the current national rate, so expect it to be challenged, and expect the tribunal to reduce it to the open market rent unless your property genuinely sits that far below market. The most common reason a 10% increase is justified is a rent that has not been reviewed for several years.

Can you increase rent by 20% or more?

Legally, yes. Realistically, only where the current rent is far below market, usually after a long period with no review. Two things to weigh before you try. First, the tribunal will cap it at open market rent, so the increase only sticks if the market supports it. Second, a tenant who applies to the tribunal now faces a £47 fee and no risk of the rent being set higher than you proposed, which makes challenging much more attractive than it used to be.

How to land on the right figure

1. Find achieved rents, not asking prices. Advertised listings show what landlords hoped for. Tribunals discount them for exactly that reason.
2. Compare like with like. Same number of bedrooms, same postcode sector, same furnishing level, same condition.
3. Sense-check against inflation and wages. If your figure is far above 3%, you need a reason beyond "costs have gone up".
4. Do the void maths. One month empty costs you 8.3% of a year's rent. A 5% increase that triggers a departure and a month's void leaves you worse off than 3% and a tenant who stays.
5. Round down. £1,030 reads as considered. £1,037.50 reads as a spreadsheet.

What is the average rent increase in the UK right now?

Average UK private rents rose 3.3% in the 12 months to June 2026, reaching £1,388 a month, according to the ONS Price Index of Private Rents published on 22 July 2026.

The national picture by nation:

• UK: £1,388, up 3.3%
• England: £1,446, up 3.4%
• Wales: £843, up 4.9%, the highest of the four nations
• Scotland: £1,012, up 1.3%, the lowest
• Northern Ireland: £877, up 2.9% in the 12 months to April 2026, as the NI series runs two months behind
• London: £2,302, up 2.2%, the lowest annual rate of any English region
• Highest English region: the North East, up 6.3%

Two other indices are worth knowing, and it matters that they are not measuring the same thing. Zoopla reported average new lets at £1,321, up 2.1%, in June 2026. Rightmove put advertised asking rents outside London at £1,397, up 2.3%, and London at £2,791, up 2.9%, for Q2 2026. ONS measures the whole stock of existing tenancies, Zoopla measures newly agreed lets, and Rightmove measures what landlords are asking. The ONS figure sitting above the new-let indices tells you existing tenancies are still catching up.

One number to ignore: the 4.8% social housing rent limit for April 2026 to March 2027. It is CPI plus 1%, it applies to registered providers of social housing, and it has no application to private landlords. It is the most frequently misapplied figure in landlord content.

Historic annual rent inflation by region, for context on how far the market has come down from the 2024 peak:

What changed for rent increases on 1 May 2026?

The rent provisions of the Renters' Rights Act 2025 commenced on 1 May 2026. If you last read up on rent increases before then, five things are different.

• Permitted method. Previously a rent review clause, a mutual agreement or a Section 13 notice. Now a Section 13 notice only.
• Prescribed form. Previously Form 4. Now Form 4A for private tenancies, with Form 4 retained for social housing.
• Notice period. Previously one month for weekly and monthly tenancies, six months for annual. Now two months for all periodic tenancies.
• Tenancy type. Previously fixed-term and periodic assured shorthold tenancies. Now all assured tenancies are periodic, because assured shorthold tenancies were abolished along with Section 21.
• Tribunal outcome. Previously the tribunal could set the rent higher than the landlord proposed, and increases were backdated to the notice date. Now it cannot exceed your proposed figure, and there is no backdating.

That last change is the one that has altered landlord risk most. Under the old rules, challenging an increase carried a real chance of ending up paying more, which deterred most tenants. That deterrent is gone. Tribunal applications have risen sharply as a result, which we covered in our analysis of rent challenge volumes since the Act came in.

Our Renters' Rights Act hub covers the wider changes beyond rent.

Can a tenant refuse or challenge a rent increase?

A tenant cannot simply refuse to pay a validly served increase, but they can challenge it at the First-tier Tribunal (Property Chamber), and the process now favours them more than it used to.

• Form: MR1, "Apply for a determination of an open market rent". You reply on MR2 and the tenant can counter-reply on MR3.
• Fee: £47. Help with Fees is available to tenants who qualify. Note that some advice sites still describe this as free, which was correct before 1 May 2026 and is not correct now.
• Deadline: the tenant has to apply before the start date given in your notice. Miss it and the increase stands.
• Your response window: 28 days.
• Outcome: the tribunal sets the rent at the lower of your proposed figure and open market rent. It cannot go higher than you asked for.
• Start date: normally the date in your notice or the start of the next rental period. Where that would cause the tenant undue hardship the tribunal can defer it, but no more than two months from the date of the determination.

There is also a newer exposure worth knowing about. Under section 14(A1), a tenant can challenge the initial rent on a new tenancy without any increase notice having been served, provided they apply within six months of the tenancy beginning. Set the opening rent above market and you can be taken to tribunal over it in the first half-year.

How do rent increase rules differ across the UK?

The two-month, 52-week, Form 4A regime above applies to England only. The other three nations run different systems, and the differences are substantial enough that using English guidance elsewhere will produce an invalid notice.

Wales

Governed by the Renting Homes (Wales) Act 2016. For a periodic standard contract, the private-sector default, section 123 applies: serve Form RHW12, give at least two months' notice, and leave at least one year between increases. There is no cap. The challenge route is narrower than in England, and appears to be limited to converted contracts, meaning tenancies that began before 1 December 2022. Take advice before telling a Welsh contract-holder they have no route, because this is genuinely unsettled.

Scotland

Governed by the Private Housing (Tenancies) (Scotland) Act 2016. Give at least three months' written notice on the prescribed rent increase notice, which is mandatory rather than optional, and increase no more than once in any 12-month period. There is no rent cap currently in force: the 2022 emergency cap and the 2024 taper have both expired, and no rent control area has yet been designated under the Housing (Scotland) Act 2025.

Scotland differs from England on the point that matters most. A tenant refers the increase to a Rent Service Scotland rent officer within 21 days, at no cost, and the rent officer can set a figure higher or lower than the one you asked for. That reverses on 1 April 2027, when Scotland moves to the English position, but it is the rule today.

Northern Ireland

Governed by section 7 of the Private Tenancies Act (Northern Ireland) 2022, in force since 1 April 2025. Give at least three months' notice, and do not increase within 12 months of granting the tenancy or within 12 months of the last increase. There is no prescribed form, so written notice by email or letter is sufficient, and there is no cap. There is also no rent determination tribunal for ordinary private tenancies, so a tenant's practical remedy against a non-compliant increase is to decline to pay it.

How to increase the rent, step by step

1. Check your timing. At least 52 weeks since the last increase took effect, and at least 52 weeks since the tenancy's first period began.
2. Research achieved local rents. Two or three genuine comparables at the figure you have in mind.
3. Set the figure. Around 3% is the current defensible default. Round down.
4. Talk to the tenant first. Not a legal requirement, but a tenant who has been told why is far less likely to spend £47 on a tribunal application.
5. Download a current Form 4A from GOV.UK. Do not reuse an old copy and do not use Form 4.
6. Complete it carefully. Correct names, correct address, the new rent figure, and a start date at the beginning of a rental period at least two months away.
7. Serve it and keep proof. Record the date and method of service. If it is challenged, service is the first thing examined.
8. Diarise the new figure and update your records so the rent you are owed matches the rent you are tracking.

That last step is where increases quietly go wrong. If your records still show the old figure, a partial payment looks like a full one and arrears build without anyone noticing. Landlord Studio tracks the amount due against what has actually landed, flags the shortfall the month it appears, and lets you schedule a rent change in advance so the new amount takes effect on the right date. If a tenant does fall behind after an increase, our guide to handling late rent covers what to do next. Keeping the figures straight also means your records are already in order for Making Tax Digital.

Rent increase rules in the UK: FAQs

What is a fair rent increase in the UK?

Around 3% is the figure best supported by current data. ONS puts rent inflation at 3.3% in the 12 months to June 2026, CPI at 2.6% and private sector regular pay growth at 2.9%. Fairness is ultimately local though: an increase is fair if it brings the rent into line with achieved rents for comparable properties nearby, and unfair if it exceeds them.

How much notice does a landlord have to give for a rent increase?

Two months, for every periodic tenancy in England, whatever the rent payment frequency. Wales also requires two months. Scotland and Northern Ireland both require three.

Can a landlord increase rent during a fixed-term tenancy?

The question no longer arises in England. Fixed-term assured tenancies were abolished on 1 May 2026 and all assured tenancies are now periodic, so the Section 13 route is the only route.

How many times a year can a landlord increase the rent?

Once. The new rent cannot take effect less than 52 weeks after the previous increase took effect, and no increase is possible in the first 52 weeks of the tenancy.

Is there a maximum rent increase in England?

No. There is no statutory cap on the amount you can propose. The effective ceiling is the open market rent, because a tribunal will set a challenged increase at the lower of your proposed rent and market rent. The 4.8% figure widely quoted for 2026 to 2027 is the social housing rent limit and does not apply to private landlords.

What happens if a rent increase notice is wrong?

It is invalid, the old rent continues, and you have to serve a fresh notice with a new two-month notice period. The most common causes are using Form 4 instead of Form 4A, giving one month's notice instead of two, and relying on a rent review clause that has had no legal effect since 1 May 2026.