What Evidence Does the VOA Accept for a Band Challenge?

Evidence decides council tax challenges. In the year to March 2024, 65% of the 39,590 challenges the Valuation Office Agency (VOA) resolved ended in no change, and the most common reason is not that the bands were right, it is that the evidence submitted did not prove they were wrong. The VOA published its own guide to acceptable evidence in November 2024, and it is refreshingly specific about what counts and what gets ignored.

This guide translates those rules into a practical checklist: the five comparables rule, the four matching criteria, the sale price windows, and the evidence types the VOA throws out. It applies to England and Wales; the submission process itself is covered in our guide to challenging your council tax band.

What counts as a comparable property?

The core of any challenge is up to five comparable properties sitting in a lower band than yours. But "comparable" is a term of art. The VOA matches properties on four criteria, and a comparable that fails one of them is easy for a caseworker to dismiss:

The size rule catches most people out. Two "three-bedroom semis" can differ by 40 square metres, and the VOA compares floor areas, not bedroom counts. If you do not know your floor area, your EPC certificate lists it, and EPCs are public. The same goes for the comparables you cite.

Finding candidates is the easy part: every band is public. Our free postcode checker lists the bands on your street from official VOA data, and our guide to checking your neighbours' bands explains how to read the results.

What sale price evidence counts?

Bands are set by what the property was worth at a fixed valuation date, so only sale prices from around that date carry weight. The windows are strict:

• England: sales between 1 April 1989 and 31 March 1993 (bands reflect 1 April 1991 values).
• Wales: sales between 1 April 2001 and 31 March 2005 (bands reflect 1 April 2003 values).

A sale of your own home, or a close comparable, inside the window is the strongest single piece of evidence a challenge can contain. A 2024 sale price proves nothing by itself, because bands do not track today's market. If all you have is a recent price, it needs converting to a 1991 value first, which is what our guide to estimating your home's 1991 value walks through.

What evidence does the VOA reject?

The VOA is explicit: house price calculators and house price indices are not accepted as evidence. That includes the reverse-calculation method popularised by money-saving sites, where you deflate a recent sale to 1991 using a national or regional index. The VOA's objection is that indices average across thousands of properties and say nothing reliable about your street.

How do I check the VOA's data on my home?

The VOA holds property attribute data for every dwelling it has banded: floor area, property type, age, and other physical details recorded at valuation. You can ask the VOA for the attribute data it holds on your own property, and querying it is worth doing before you challenge. If the VOA has your floor area wrong, or has you recorded as a detached house when you are a semi, that error may explain the band by itself, and correcting the record becomes part of your case.

During a challenge you can also ask the VOA to explain how your band was arrived at relative to the comparables you cite. Caseworkers work from the same attribute data, so framing your evidence in their terms (floor areas, build era, property type) makes it easier to agree with you.

How do I put an evidence pack together?

1. List every property on your street or estate with its band, and shortlist homes of the same type and build era as yours.
2. Check sizes: confirm each shortlisted comparable is within roughly 10% of your floor area, using EPC records where you can.
3. Pick your best five (or fewer). Three strong comparables beat five weak ones.
4. Add sale price evidence from the valuation window (1989 to 1993 in England, 2001 to 2005 in Wales) where it exists.
5. Write a short case summary tying it together: your band, the comparables, why they match, and the band you believe is correct.

This research is exactly what the Council Tax Challenger evidence pack automates. For £9.99 it pulls the comparable properties for your postcode from official VOA data, checks the match criteria, estimates the 1991 valuation, scores your case strength, and produces a PDF with a ready-to-paste case summary. The challenge itself remains free on gov.uk. And before you submit anything, read the band review vs proposal guide to confirm which route your evidence will travel down.