---
title: "Mansion tax sparks £247k plunge in Westminster house prices"
publisher: "Stockmark.IT"
author: "Stockmark.IT Website"
published: "2026-07-23T06:16:18+00:00"
modified: "2026-07-23T06:16:18+00:00"
date: 2026-07-23
canonical: "https://stockmark.it/mansion-tax-sparks-247k-plunge-in-westminster-house-prices/"
category: "Mortgage"
categories: ["Mortgage", "Tax"]
image: "https://i0.wp.com/stockmark.it/wp-content/uploads/2026/07/mansion-tax-sparks-247k-plunge-in-westminster-house-prices.jpg?fit=1402%2C1122&quality=89&ssl=1"
format: "news"
language: "en-GB"
---

# Mansion tax sparks £247k plunge in Westminster house prices

**Published:** July 23, 2026
**Author:** Stockmark.IT Website
**Categories:** Mortgage, Tax
**Featured image:** ![Mansion tax sparks £247k plunge in Westminster house prices](https://i0.wp.com/stockmark.it/wp-content/uploads/2026/07/mansion-tax-sparks-247k-plunge-in-westminster-house-prices.jpg?fit=1402%2C1122&quality=89&ssl=1)

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The Westminster property market has entered a period of swift revaluation, with the latest data showing a dramatic year on year fall in central London prices. In the year to May 2026, average values in the borough slipped by nearly a quarter, sliding from about £1.08 million in May 2025 to roughly £836,000. The decline, the steepest recorded since Land Registry began compiling house price figures in 1996, underscores how the city’s most expensive streets are being priced into a new era of fiscal and political risk.

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