The full negotiation worked example
How a £6.99 paid buyer would negotiate Flat 14, Sample Wharf House, London SE16 4ZZ.
Asking £465,000. Modelled fair value £428,000. We show the comps, the market data, the property flags, the mortgage maths and the exact wording you would use.
"Buyers typically save £5,000 to £25,000 when they walk into the offer conversation with a single document that quotes Land Registry sold prices, BoE base rate and tribunal history. The agent simply has nothing to push back on."
Suggested offer range
Centred on a modelled fair value of £428,000. The asking price of £465,000 is +8.6% above what the data supports.
The negotiation script, written for you
On the public data alone this flat models to £428,000, with a defensible range of £415,000–£441,000. The agent has it at £465,000, which is 8.6% above where the comparable sales sit. The five Sample Wharf House flats sold in the last 24 months (Jul 2024 £428k, Apr 2024 £438k, Sep 2024 £412k, Mar 2025 £445k and a Feb 2024 penthouse at £465k) give a median of £438,000 adjusted to 67 m².
Macro is on your side, not the seller's. The Bank of England cut to 4.25% in March 2026, and Land Registry UKHPI has Southwark at −2.1% annual. The flat last traded in August 2019 for £312,500, the seller is asking the next buyer to accept an annualised growth assumption the index data does not support.
On top of that there are three concrete property issues: the building is on the BSR Higher-Risk Building register with no EWS1 form on file, the freeholder has three Property Chamber tribunal decisions against them in five years, and it sits in Flood Zone 2, built post-2009 so Flood Re does not apply.
Open at £415,000 framed around the −2.1% HPI and the EWS1 uncertainty, not the asking. Hold the line at £428,000. Only stretch towards £441,000 if the seller produces a current PAS 9980 FRAEW that materially lowers the EWS1 risk. Do not anchor the conversation on the asking number.
5 sold flats in Sample Wharf House, last 24 months
All same postcode (SE16 4ZZ), all flats, all within 50 m. Sourced from HM Land Registry Price Paid Data.
| Address | Sold | Price | £/m² @ 67m² | Floor | Detail |
|---|---|---|---|---|---|
| 802 Sample Wharf House | Mar 2025 | £445,000 | £6,642 | 8 | |
| 308 Sample Wharf House | Sep 2024 | £412,000 | £6,149 | 3 | |
| 215 Sample Wharf House | Jul 2024 | £428,000 | £6,388 | 2 | |
| 510 Sample Wharf House | Apr 2024 | £438,000 | £6,537 | 5 | |
| 1102 Sample Wharf House | Feb 2024 | £465,000 | £6,940 | 11 (penthouse) | |
| Median | across 5 comps | £438,000 | £6,540 |
Macro signals all point the same way
Four risk flags, −10.0% total
Each flag below has hard evidence behind it, a register entry, a tribunal decision, an EA flood map tile, a Companies House record. None of these are surveyor judgement calls.
- -6.0%BSR Higher-Risk Building, no EWS1 confirmedMortgage pool narrows, cladding risk priced in
- -1.5%Property Chamber tribunal history (3 cases)Pattern of freeholder disputes, service-charge and RTM
- -1.5%Flood Zone 2, medium flood risk (not Flood Re)Built 2017, post-2009 cut-off → Flood Re excluded
- -1.0%Overseas company seller (Guernsey OCOD)Process risk only, Register of Overseas Entities checks
What the negotiation is worth on your monthly mortgage
75% LTV, 25-year repayment, 5.75% rate (BoE 4.25% + 1.5pp typical 5-year fix margin in May 2026).
Where this report stops, and what to do about it
A defensible offer is built on public data only. That has costs we should be upfront about.
- 1. Public sold data only, no asking prices, no live sentimentWe use HMLR Price Paid (sold transactions), not Rightmove or Zoopla list prices. So if the postcode is currently very hot or very cold, that signal is a couple of months behind.
- 2. 5 comparables is a small sampleIn dense urban postcodes 5 is fine. In niche property types or low-volume postcodes you may see just 1-2, which is when the report flags "low comp confidence".
- 3. £/m² assumes uniform areaHMLR does not publish floor areas. We normalise to the subject's 67 m². If a comp was substantially larger or smaller, the £/m² ranking is approximate.
- 4. Adjustment percentages are heuristic−6% for "BSR HRB no EWS1" is a market-typical figure, not a measurement. A RICS surveyor doing a Level 3 might land at −5% to −9% on the same flag.
- 5. We can't see chain status or competing offersPublic data tells you what the property is worth. Only the agent tells you how urgently the seller needs to clear.
What buyers using this report actually saved
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