The Labour government has revealed plans to send an army of valuation inspectors into private residences to determine payments for a proposed annual mansion tax surcharge on high-value properties.
In last year's Budget, Chancellor of the Exchequer Rachel Reeves announced that owners of high-value flats and houses would face an annual council tax surcharge ranging between £2,500 and £7,500, regardless of their financial circumstances.
While the valuation threshold was originally set at £2 million, the head of the Valuation Office told MPs earlier this year that properties valued at £1.5 million are being reassessed and could also be included in the surcharge.

Valuation inspection powers and penalties
Under the proposed measures, valuation inspectors, dubbed mansion tax police, will receive legal powers to enter private homes and carry out internal inspections to verify valuations.
Homeowners who refuse admission to inspectors measuring downstairs lavatories, cupboards, or private areas will face a criminal record and a fine of up to £200.
MPs were told that internal inspections will need to be conducted regularly to ensure property valuations remain updated over time.
In addition to physical home visits, local councils are launching drones to measure patios and back gardens, enabling authorities to levy extra taxes on homeowners using garden sheds as home offices or gyms.
The government is introducing these property monitoring measures at a time when state funds cover the electricity and gas bills of civil servants working from home.
Background on UK property taxation
The Valuation Office Agency is the government executive agency of HM Revenue and Customs responsible for assessing domestic property values across England and Wales to compile council tax banding lists.
The proposed internal property inspections follow previous property taxation ideas, such as a scheme put forward by former Deputy Prime Minister John Prescott to levy higher taxes on properties situated in cul-de-sacs, near parks or golf courses, or featuring attractive views.
The current proposal contrasts with housing reforms under former Prime Minister Margaret Thatcher in the 1980s, whose Right to Buy policy enabled millions of working-class council house tenants to purchase their own homes.
Addressing recent political debate, Greater Manchester Mayor Andy Burnham stated that there will be no snap general election, while leaving open the possibility of future tax increases.

Impact on property values and pensioners
Writing in an opinion column, journalist Richard Littlejohn illustrated the rise in property values by detailing a modest turn-of-the-century terraced house in a north London suburb purchased for £95,000 in 1985 with a large mortgage.
His next-door neighbours, nursing sister Eileen and barman John, had purchased their identical home two decades earlier for £4,000.
Although Littlejohn sold the property 12 years later for just under £250,000, similar homes in the area are now listed for sale at £1,900,000, bringing them into mansion tax scope if the threshold drops to £1.5 million.
Elderly residents living on fixed pensions in homes bought decades ago for small sums face minimum annual charges of £2,500 on top of existing council tax rates levied in left-wing boroughs.
Families with mortgages also face stagnant incomes alongside rising living costs and the highest overall tax burden in the United Kingdom since the Second World War.
Littlejohn argued that the government is targeting property owners to fund expanded state spending, including welfare benefits, larger televisions for non-workers, and accommodation costs for asylum seekers and illegal migrants.

Comparison to television panel shows
Littlejohn compared the proposal of body camera-wearing valuation inspectors to a prospective revival of the popular television panel show Through The Keyhole.
Through The Keyhole originally broadcast on ITV from 1987 to 1996 before transferring to Sky and later the BBC, where it aired until 2008.
Hosted by Sir David Frost alongside Loyd Grossman, the show featured Grossman exploring the homes of actors, comedians, singers, and sportspeople to gather clues while a celebrity panel guessed the owner's identity.
Featured properties included novelist Jeffrey Archer's apartment on the River Thames, media publisher Robert Maxwell's Oxfordshire estate, radio DJ Tony Blackburn's home, and fixer-uppers renovated by up-and-coming soap stars.
Regular panel members on the original series included television presenter Chris Tarrant, newspaper editor Eve Pollard, and comedy actor Kenneth Williams.
Littlejohn satirically proposed a reboot hosted by Andy Burnham, LBC broadcaster James O'Brien, or comedian Nish Kumar, featuring actor Steve Coogan in Grossman's role alongside panel members Angela Rayner, Jeremy Corbyn, and Zack Polanski.
Under the proposed format, home owners would be named, shamed, booed by the studio audience, and forced to pay up to £7,500 on air.
