Challenge 
A fixed price. No percentage of your savings.
Check your home free. If it's near a threshold, we'll prepare the evidence for its April 2026 value and, when draft valuations are published, challenge your band for you if the evidence supports it. You keep every pound you save.
Check, personalised preview and consultation
£0
- The mansion tax checker: your estimated 2026 value, band and charge
- A personalised preview: the first page of a completed pack, and what we found for your home
- A free consultation with our property expert
Property Value Evidence Pack
£299 £199 introductory, to 30 November 2026
- Completed sales of homes like yours, checked against Land Registry records, with each sale's sales particulars checked, from the online property portals and a trade database not available to the public, including photographs and floor plans, so its condition, outside space and other details can be compared accurately with your home
- Each sale adjusted to April 2026 and to your home's qualities, with the reasons
- An Indicative Value and evidence range against the thresholds, with your savings over 1, 5, 10 and 20 years (illustrative: assuming 2% yearly inflation and that your home stays in the same band at the 2033 revaluation and later ones)
- A dated record of your home's 2026 condition
- The grounds and next steps, signed off by our property expert
- Free follow-up: when draft valuations are published, expected in autumn 2027, we compare yours with your evidence and tell you whether a challenge is worth making
Normally delivered within 7 calendar days of your payment and the information we need. The full fee comes off the Appeals Service if you go ahead.
Appeals Service
£695 fixed, less what you paid for your review
- We check your official value against your Property Value Evidence Pack
- We prepare and submit your challenge to the Valuation Office within the deadline
- We handle the Valuation Office's questions and reply
- If the answer isn't right, we advise you on whether to appeal to the Valuation Tribunal (a tribunal appeal is not included, and is quoted separately)
After the review, that's £396 to £496 more. Includes the Property Value Evidence Pack if you haven't had one.
How a mansion tax appeal works: the challenge and tribunal stages, key dates and the evidence that counts.
Our fees
| Service | Price | When you pay |
|---|---|---|
| Mansion tax checker, personalised preview, first consultation | Free | Never |
| Property Value Evidence Pack | £299 £199 if ordered by 30 November 2026 | When you order. Refunded in full if we decline because a pack isn't worth it for your home. |
| Comparing your pack with your official value | Included | Never: part of the review |
| Appeals Service | £695 fixed, less what you paid for your Property Value Evidence Pack | When we submit your challenge |
| Success fee | None | Never. We don't take a percentage of your savings. |
| Independent RICS valuation | At cost | Only where one is needed, and only with your agreement first |
What it costs, compared
A home valued in the £3.5m to £5m band that a challenge moves to the band below saves £1,500 a year.
| Who | Fee | You keep of the first two years' saving (£3,000) |
|---|---|---|
| A firm charging 40% of two years' saving | £1,200 | £1,800 |
| Challenge Mansion Tax: Appeals Service | £695 | £2,305, and all of it after that |
| Challenge Mansion Tax: Property Value Evidence Pack only, you submit | £299 (£199 introductory) | £2,701 or more |
Mansion tax bands are separate from your council tax band (A to H), which stays as it is. Under the proposals, challenging is expected to be free, and you can do it yourself with your Property Value Evidence Pack. Savings depend on the band actually coming down, which we can't guarantee.
Questions
Can I challenge my band myself?
Yes. Under the proposals, challenging is expected to be free, as it is for council tax. Your Property Value Evidence Pack gives you the evidence to do it yourself. The Appeals Service is for owners who'd rather we prepared and submitted the challenge for them.
What if a challenge isn't worth it for my home?
We'll tell you honestly in your pack. And if your pack's Indicative Value is more than 25% away from the nearest band threshold (£2m, £2.5m, £3.5m or £5m), you can ask for a refund, less a £50 administration fee, within 30 days of receiving it. See our terms. If your official value turns out to be fair, we'll say so rather than recommend an appeal.
Does the Property Value Evidence Pack include submitting the challenge?
No. The review prepares your evidence now. As a free follow-up, we also check your official value against your evidence when it is published. You can then submit the challenge yourself with your Property Value Evidence Pack, which is expected to be free, or ask us to do it with the Appeals Service (£695, less what you paid for the review).
How does the credit work?
Everything you paid for your Property Value Evidence Pack comes off the £695 Appeals Service. If you paid the £199 introductory price, the Appeals Service costs you £496 more; at £299, it's £396 more.
When do I pay for the Appeals Service?
When we submit your challenge, after the draft valuations are published (expected autumn 2027) and the challenge window opens (proposed for April 2028). There's no success fee, so the price is the same whatever the outcome.
Is the Property Value Evidence Pack a valuation?
No. It's an independent evidence review built from completed sales, not a RICS valuation. Where the sums justify a formal valuation, we'll recommend one, at cost and only with your agreement.
By ordering you agree to our terms and conditions, including your right to cancel. When you order, you ask us to start straight away and confirm that your right to cancel ends once your pack has been delivered. Your Property Value Evidence Pack and its Indicative Value are prepared only to help you consider your High Value Council Tax Surcharge liability, and must not be relied on for valuation, sales, mortgages, borrowing or any other purpose. Indicative Values are reached without viewing the property, so its actual market value may vary significantly. Prices include VAT where it applies. The surcharge rules, valuation date and challenge process are proposals and may change. We prepare evidence to support a challenge and can't guarantee the outcome. This is not tax, legal or valuation advice.