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Apply for a Market Rent Determination: How the Tribunal Process Works
- A market rent determination is the First-tier Tribunal (Property Chamber) deciding the open-market rent under section 14 of the Housing Act 1988.
- The tenant applies, not the landlord. It is triggered when a tenant challenges a Section 13 rent-increase notice.
- The application must reach the tribunal before the date the new rent is due to start.
- From 1 May 2026, under the new section 14ZB, the tribunal can confirm or reducethe landlord’s figure — never raise it.
“Apply for a market rent determination” is the phrase for one specific event: asking the First-tier Tribunal to decide what a property would let for on the open market, after a landlord has proposed a rent increase the tenant thinks is too high. It is not a general valuation service and it is not a complaint process. It is the statutory check on a Section 13 notice.
This page explains what the determination is, who can apply, the deadline that matters, what the tribunal can and cannot do, and how the Renters’ Rights Act 2025 changed the maths in the tenant’s favour.
What a Market Rent Determination Actually Is
When a landlord wants to raise the rent on a periodic assured tenancy, the lawful route is a Section 13 notice under section 13 of the Housing Act 1988. The notice proposes a new rent and a date from which it takes effect. The tenant does not have to simply accept it. If the tenant believes the figure is above market rate, they can refer the notice to the First-tier Tribunal (Property Chamber — Residential Property), which then makes a determination of the rent.
The standard the tribunal applies is set by section 14: the rent at which the dwelling “might reasonably be expected to be let in the open market by a willing landlord under an assured tenancy”. That is the market rent. It is decided by comparison with recent lettings of similar properties in the same area — not by reference to the landlord’s mortgage, running costs, or the tenant’s ability to pay.
Who Applies — and Who Cannot
The tenantapplies for the determination. The landlord’s role is to serve a valid Section 13 notice and, if it is challenged, to produce evidence that the proposed rent is at or below market rate. A landlord cannot ask the tribunal to set a higher rent — the landlord’s proposed figure is the ceiling (see below).
That asymmetry is the single most important thing for a landlord to understand before serving. Once you propose a figure, the tribunal process can only hold it or bring it down. There is no upside to under-shooting and no mechanism to correct it upward mid-process.
The Deadline That Decides Everything
The tenant’s application must reach the tribunal before the date the proposed new rent is due to take effect. GOV.UK guidance is clear that a tenant disputes the increase by applying to the First-tier Tribunal before the starting date of the proposed new rent (GOV.UK: Guide to the Renters’ Rights Act).
If the tenant misses that date, the increase takes effect as proposed and the chance to refer it is gone for that notice. This is why the two-month minimum notice period (from 1 May 2026, up from one month) matters to both sides: it is the window in which a tenant decides whether to challenge.
What the Tribunal Can and Cannot Do
For any increase taking effect on or after 1 May 2026, the tribunal works under the new section 14ZB of the Housing Act 1988, inserted by section 7 of the Renters’ Rights Act 2025. It must set the rent at “the open-market rent, if lower than the proposed rent, and otherwise, the proposed rent”. In plain English: confirm or reduce, never raise.
Before the Act, the tribunal could set a rent higher than the landlord proposed if the open market warranted it — a real deterrent to tenants challenging. That risk is gone. GOV.UK summarises the change as tenants never paying more than the landlord asked for. The practical effect is that every challenge is now downside-only for the landlord.
What the tribunal will not do: it will not weigh the landlord’s mortgage or costs, and it will not reduce a genuine market rent because the tenant says they cannot afford it. Affordability is not the test. The market rent is the test.
Prepare your comparable evidence before you serve, not after the referral arrives. The tribunal weighs recent lettings of similar properties in the same area above everything else. Three to five genuine comparables, plus a written valuation from a local agent who has seen the property, is the evidence that holds a figure at tribunal.
And because section 14ZB caps the outcome at your proposed figure, serve at a defensible market rate the first time. A figure you can evidence is confirmed; an inflated figure is reduced; an under-cooked figure is locked in for another 52 weeks.
How an Application Proceeds, Step by Step
1. The landlord serves a Section 13 noticeon the prescribed form (Form 4A from 1 May 2026), proposing the new rent and its start date, with at least two months’ notice.
2. The tenant decides. They can accept and pay, negotiate, or refer the notice to the First-tier Tribunal before the start date.
3. The tenant applieson the tribunal’s form. The tribunal sets its own procedure and any fee; many determinations are decided on the papers or at a short hearing.
4. Both sides submit evidence— principally comparable rents for similar local properties, plus the property’s condition and any recent improvements or disrepair.
5. The tribunal determines the market rentunder section 14, capped at the landlord’s proposed figure by section 14ZB. The determined rent then applies from the date the tribunal directs.
How Much Can the Rent Move?
The determination fixes a figure, not a percentage. If your local comparables support the proposed rent, the tribunal confirms it. If the proposed rent sits above the comparable range, the tribunal brings it down to market. The size of any reduction is driven entirely by the gap between what was proposed and what the local market evidences.
If you want to model a defensible figure before you serve — one that survives a determination rather than inviting one — start from comparable evidence, not from your costs. Our guide on how much you can increase rent works through the market rent test with a worked example.
Build a tribunal-ready Section 13 noticeRelated guides
How Much Can I Increase Rent?
The market rent test the tribunal applies, the evidence that wins, and a worked example.
Renters' Rights Act 2025: Landlord Guide
The s.14ZB tribunal cap, the 2-month notice period, and what else changed on 1 May 2026.
How Often Can Rent Be Increased?
Once every 52 weeks, via Section 13 — and why rent-review clauses no longer work.
Frequently Asked Questions
Who applies for a market rent determination — the landlord or the tenant?
The tenant. The landlord proposes a new rent by serving a Section 13 notice. The tenant, if they believe the proposed figure is above market rate, applies to the First-tier Tribunal for a determination of the market rent before the new rent takes effect. The landlord cannot apply to the tribunal; the landlord's role is to serve a valid notice and, if challenged, produce evidence.
What is the deadline to apply for a market rent determination?
The tenant's application must reach the First-tier Tribunal before the date the proposed new rent is due to take effect, as stated on the Section 13 notice. GOV.UK's Guide to the Renters' Rights Act confirms the application must be made before the starting date of the proposed new rent. Miss that date and the increase takes effect as proposed.
Can the tribunal set a rent higher than the landlord proposed?
No, not for increases taking effect on or after 1 May 2026. Section 14ZB of the Housing Act 1988 (inserted by section 7 of the Renters' Rights Act 2025) requires the tribunal to set the open-market rent if it is lower than the proposed rent, and otherwise the proposed rent. In plain terms: the tribunal can confirm or reduce the landlord's figure, never raise it. GOV.UK puts it as tenants never paying more than the landlord asked for.
What does the tribunal actually decide?
Under section 14 of the Housing Act 1988 the tribunal determines the rent at which the dwelling might reasonably be expected to be let in the open market by a willing landlord under an assured tenancy. It compares the property against recent lettings of similar properties in the same area. It does not consider the landlord's mortgage, costs, or the tenant's personal circumstances when fixing the market figure.
Does it cost the tenant anything to apply?
The First-tier Tribunal (Property Chamber) sets its own procedure and any fees. Applications are made on the tribunal's form and most rent determinations are decided on the papers or at a short hearing. Check the current tribunal guidance for fees and forms before applying, as these change.