Rent-Tribunal Evidence: How to Assemble Comparables That Hold Up

Last updated: 11 May 2026

Quick Answer

The First-tier Tribunal (Property Chamber) determines the open-market rent for a property by reference to comparable lettings — properties of similar type, size, location and condition that have been let recently. Five to ten good comparables is the working target. Agreed rents (from concluded lettings) carry more weight than asking rents. Both landlord and tenant should expect to put forward comparables in any Section 13 / Form 4A challenge, and the panel's RICS-qualified valuer member will weigh the evidence using their own knowledge of the local market.

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Why Comparables Matter More Than Anything Else

A rent-tribunal application is a valuation exercise, not a legal argument. The tribunal's job under Section 14 of the Housing Act 1988 is to decide what the property would let for on the open market under a fresh assured tenancy on the same terms as the existing one. There is no fairness test, no consideration of the tenant's ability to pay, no rent-control formula. The question is: what is the market rent?

The way the panel answers that question is by comparison. They look at what other landlords are charging — and what other tenants are agreeing to pay — for properties that are similar enough to the subject property to be meaningful. Falcon Chambers' commentary on Property Chamber valuation practice describes this as "the comparability of comparables", and the phrase captures the central technical question: how comparable does a comparable need to be? (falcon-chambers.com, retrieved 2026-05-11)

For both sides of a Form 4A dispute, the practical answer is the same: the more closely your comparables match the subject property, the more weight they will carry.

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What Counts as a Comparable

A useful comparable shares the following with the subject property:

• Type — flat, terraced house, semi-detached, purpose-built, conversion
• Number of bedrooms — and ideally number of reception rooms and bathrooms
• Location — same postcode if possible, certainly the same neighbourhood, close to similar transport links, schools and amenities
• Condition — broadly equivalent state of repair and decoration
• Furnishings — furnished, part-furnished, or unfurnished (these are not interchangeable for rent purposes)
• Specification — kitchen and bathroom standard, white goods, central heating, double glazing, EPC rating
• External features — garden, parking, balcony, communal facilities

A two-bedroom Victorian conversion flat in zone 3 with a small garden and on-street parking is not comparable to a two-bedroom new-build flat in zone 2 with a roof terrace and a residents' gym. Both might be valid evidence, but the tribunal will discount for the differences.

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Asking Rents vs Agreed Rents

The single most important quality distinction in comparable evidence is between asking rents (what landlords are advertising for) and agreed rents (what tenancies have actually concluded at).

Asking rents are easy to find. Rightmove, Zoopla and OpenRent list thousands of available properties at any time. But asking rents are also aspirational — landlords advertise at a figure they hope to achieve, and the achieved figure is often lower (sometimes 5–10% lower in slower markets).

Agreed rents are harder to find but carry much more evidential weight. A property listed at £2,000 per month and let at £1,850 tells the tribunal the market figure is £1,850, not £2,000. The tribunal will use the agreed figure if it can be evidenced.

Sources for agreed rents include:

• Letting agents. Many will provide written evidence of recent agreed lettings, especially if instructed by one of the parties.
• The local landlords' association. Some keep aggregated market data.
• Published Property Chamber decisions, available via gov.uk and the GRC tribunal decisions portal.
• The Office for National Statistics' Index of Private Housing Rental Prices — a useful contextual figure, but not specific to a property.

For a Form 4A challenge in 2026, a mix of five or six listings (asking rents from Rightmove/Zoopla) plus two or three agreed-letting confirmations is a strong evidence pack. Black Acre Surveyors' April 2026 Form 4A guide makes the same point from the valuation perspective: a well-curated comparable schedule beats a large undiscriminating one (blackacresurveyors.com, retrieved 2026-05-11).

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What Each Side Should Do

The Landlord

If you are serving Form 4A:

• Pick the rent figure against comparable evidence before serving. A landlord who lets an agent pick a number, signs the form, and then has to defend the figure at tribunal is starting from the back foot.
• Keep the comparable evidence pack with the form. When the tenant applies to the tribunal, you will need the pack within four to six weeks.
• Get a letting agent's letter. Most agents will write a short letter setting out current achievable rent for the property with reasoning. This costs £50–£150 and carries genuine weight at tribunal.
• Acknowledge the property's weaknesses. A tribunal that thinks you are presenting an overly favourable picture will discount your evidence. Be honest about condition issues, dated specification, or external factors (noisy main road, unloved building exterior).

The Tenant

If you are challenging a Form 4A:

• Search Rightmove, Zoopla and OpenRent. Set the parameters to match your property — same number of bedrooms, same broad area, same furnishing status. Print or screenshot at least eight to ten listings. Note the asking rents and the dates.
• Look for agreed lettings. "Sold STC" or "Let Agreed" listings are not as visible, but they appear from time to time. Some agents publish recent agreed figures on their company websites.
• Photograph your property's weaknesses. Disrepair, dated kitchens, mould, poor heating — anything that argues for a lower-than-headline rent.
• Photograph the comparables' strengths. If the comparables in your evidence pack have newer kitchens, better gardens, or more parking, the tribunal can see why their rents might be higher than yours.
• Build a one-page schedule. Address, type, bedrooms, condition, asking rent, source, date. The tribunal does not want to leaf through 30 raw printouts; they want a structured schedule with the documents attached.

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The Panel's Own Knowledge

A point that catches both sides unprepared: the panel is not a neutral tribunal that operates purely on the evidence in front of it. It is a specialist tribunal that brings its own expertise.

The valuer member of the panel — a RICS-qualified surveyor with experience of the local rental market — will be looking at your evidence through their own knowledge of the area. If you put forward asking rents that the valuer thinks are unrepresentative, they will discount your evidence. If you put forward a comparable that the valuer recognises as a property they once valued at a particular figure, that will weight against any contrary submission.

This expert input is the point of the FTT Property Chamber jurisdiction. The tribunal is not a court trying to weigh evidence neutrally; it is a specialist body that combines the parties' evidence with its own valuation skills.

For both sides, the practical lesson is: do not try to mislead the tribunal. The valuer will catch it. Present an honest case backed by good evidence.

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The Condition Factor

Condition is one of the biggest single drivers of rent value, and it is often the area where tenant evidence is strongest.

A property with serious disrepair has a lower market rent than one in good condition. A property with mould, faulty heating, leaking pipes, or unsafe wiring has a lower market rent still. A property that is genuinely uninhabitable has a very low market rent — sometimes effectively nil.

For the tenant in a Form 4A challenge, this means condition photographs are powerful evidence. Dated photographs (with the date visible in the image), videos walking through the property, and any independent reports (Environmental Health, surveyor, the council's Decent Homes inspection) all count.

The Renters' Rights Act 2025 brings the Decent Homes Standard to the private rented sector from 1 May 2026. Where a property does not meet the standard, the tribunal will treat that as a substantive factor reducing the market rent. See our separate piece on disrepair as a rent-tribunal factor for the full doctrine.

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Specification and Extras

Subtler than condition, but still influential, is specification. Two flats can both be "in good condition" but command quite different rents based on:

• Kitchen — a modern, fitted, well-equipped kitchen adds rent value; a 1990s laminate kitchen with a freestanding cooker does not
• Bathroom — same logic; a power shower over a separate bath is a feature, a single shower-bath over a discoloured bath is not
• Heating — full gas central heating is standard; electric storage heaters or no heating at all is a material discount
• Insulation and EPC — a property with EPC C or above will let for more than the same property at EPC F; the Government has consulted on raising the Minimum Energy Efficiency Standard to EPC C for new tenancies from 2028 and for all tenancies from 2030, with final regulations awaited
• White goods — dishwasher, washing machine, dryer, fridge-freezer all included is a feature; bring-your-own is not
• Furniture — furnished, part-furnished, or unfurnished are three different price points

For tenants, the trick is to compare like-for-like. A furnished comparable cannot fairly set the rent for an unfurnished subject property. For landlords, similarly, do not put forward unfurnished comparables for a furnished property without adjustment.

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A Working Comparable Schedule

The format that works best at tribunal is a simple one-page table with documents attached. Something like:

Attach the original listings, the agent letter, and a one-page note explaining how each comparable maps to the subject property. That is the evidence pack the tribunal will read first.

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Common Mistakes to Avoid

• Cherry-picking. Both sides do this. The tribunal sees through it. If your evidence pack has six comparables all clustering tightly around the figure that suits you, the panel will assume you have screened out the inconvenient ones.
• Using bedrooms-plus-postcode as your only filter. A three-bed flat over a takeaway with a single bathroom is not comparable to a three-bed flat in a quiet residential cul-de-sac with two bathrooms, even if both are SW15.
• Mixing furnishing status. Furnished and unfurnished are different markets. Mixing them muddles the evidence.
• Stale evidence. A comparable from 18 months ago is barely a comparable. Aim for evidence from the last six months, certainly the last 12.
• Ignoring condition. A pristine new-build is not a fair comparable for a tired Victorian conversion. The tribunal expects you to account for the difference.
• No supporting note. Raw printouts without a schedule and explanation leave the panel to do the work. They will, but they will not necessarily reach the conclusion you want.

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What the Tribunal Will Do With the Evidence

The panel will read both sides' submissions, look at the photographs and the comparable schedules, and (sometimes) inspect the subject property. They will then deliberate.

Their decision will set out the comparables they relied on, the adjustments they made for differences in type, location, condition, specification and furnishing, and the figure they have arrived at. The decision is appealable to the Upper Tribunal (Lands Chamber), but only on a point of law — not on the valuation itself.

The FTT's valuation is a matter for the specialist tribunal, and the Upper Tribunal will only intervene on a clear point of law (not on the valuation figure itself). For most practical purposes, the FTT's determination is final.

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The Bundle for Tribunal

The tribunal application bundle should contain:

• The Form 4A as served
• The tenancy agreement
• A schedule of comparables with the original listings attached
• Photographs of the subject property (dated)
• A photograph schedule keyed to property features
• Any condition or specification reports
• The tenant's brief witness statement (or the landlord's, depending on side)
• Any letting-agent letters supporting the figure

BundleCreator's tenancy-variation templates pre-load this bundle structure for FTT Property Chamber use.

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BundleCreator's tenancy-variation templates at /tenancy-variation include the comparable evidence schedule, the property photograph schedule, and the tribunal witness statement, all aligned to the FTT Property Chamber bundle requirements.

Nothing in this article is legal advice or a substitute for it. The information here describes the law as it stands at the date shown; the law and procedure may change. For free regulated advice, contact Citizens Advice, Shelter England, your local Law Centre, or the Housing Loss Prevention Advice Service (which is available without charge to any tenant served a Section 8 notice). The Tribunal Procedure (First-tier Tribunal) (Property Chamber) Rules 2013 (as amended) apply to rent-determination applications.