HMRC to Send Inspectors Into UK Homes for Mansion Tax Valuations From 2028

HMRC will send valuation agents into homes across the UK to assess whether they are liable for the new mansion tax, set to take effect in April 2028. Properties worth more than £2 million will face an annual surcharge of between £2,500 and £7,500 on top of existing council tax. Ministers confirmed that inspectors will conduct internal inspections where property features can only be confirmed inside or remeasurement is required. Homeowners who refuse entry commit a criminal offence and face fines up to £200.

How the mansion tax inspection process will work

HMRC’s Valuation Office will initially use third-party data, publicly available information and satellite imagery to estimate property values. However, physical visits will be required where internal attributes cannot be confirmed remotely or where updated measurements are needed. Inspectors will record details including property size, architectural style, number of floors, bedrooms and bathrooms. According to government guidance, visits will be arranged in advance and follow an official code of practice.

Who faces fines and penalties

Homeowners who refuse an inspector entry face a fine of up to £200 for obstruction and commit a criminal offence. Failing to provide requested information without reasonable excuse risks a fine of up to £500. A government spokesman said any visits would be arranged in advance with the homeowner. Properties could be visited multiple times to ensure valuation data remains current.

Scale of the mansion tax and affected homeowners

The mansion tax is expected to affect 165,000 homeowners in its first year, higher than the 120,000 originally forecast. London and the South East are expected to be hit hardest, though expensive rural properties will also be caught. Households in just four London boroughs – Kensington and Chelsea, Wandsworth, Richmond upon Thames and Westminster – are estimated to pay £270 million a year combined. Even some London flats are set to be caught by the levy, while some castles outside the city will escape.

Concerns raised over enforcement and fairness

Shadow chancellor Mel Stride condemned the plans as a “sinister assault on civil liberties”. Long-term homeowners who bought decades ago for a fraction of today’s value face particular concern, as the surcharge is based on current market value rather than purchase price. Some pensioners on modest or fixed incomes could find themselves liable despite limited means to pay. The government has proposed a deferral scheme allowing lower-income homeowners with annual income of £35,000 or less or savings below £16,000 to delay payment until the property is sold or passes to their estate, though the scheme remains under consultation.

Final Thoughts

The mansion tax inspection regime represents a significant expansion of HMRC’s enforcement powers over high-value property owners. With 165,000 homes expected to be affected and criminal penalties for non-compliance, homeowners should expect formal contact from the Valuation Office before April 2028.

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