A Practical Approach Using Existing Infrastructure
The core proposal
This section sets out a valuation methodology for a 1% annual property tax on all private dwellings in England. The approach is designed to be deliverable within one to two years using infrastructure that already exists, accepted methods already in use by government, and data sources already collected as a matter of routine. It avoids any requirement for physical inspection of properties, new primary legislation on valuation, or the creation of new institutional capacity.
The methodology rests on a simple hierarchy: where a property has been sold and the price recorded by HM Land Registry, that transaction price — adjusted only for the passage of time using the published UK House Price Index — provides the assessed value. Where no transaction record exists, the property's existing 1991 Council Tax valuation, adjusted forward using the same index, serves as the default. In both cases, the assessed value is then fixed until the next revaluation cycle or until the property is sold again, whichever comes first.
Why this is feasible now
Three developments have moved property valuation from theoretical possibility to demonstrated practice.
First, HM Land Registry's Price Paid Dataset now contains more than 24 million transaction records dating back to January 1995, covering residential sales across England and Wales at full market value. This is a comprehensive, continuously updated, open-data resource that records the actual price paid for every registered residential sale.
Second, the Valuation Office Agency has developed and deployed an Automated Valuation Model to support the 2028 Council Tax revaluation of all 1.5 million domestic properties in Wales. This model uses Land Registry transaction data, property characteristics, and spatial modelling to produce first-pass valuations for the vast majority of properties without physical inspection. The International Association of Assessing Officers, the recognised global authority on mass appraisal, reviewed the VOA's model and concluded that the findings were "more than satisfactory" and should give the VOA "confidence in the quality of the new valuation project conducted in Wales." The VOA estimates the approach reduces the cost of revaluation by one-third compared to manual methods.
Third, the government has already committed to using desk-based automated valuation for the High Value Council Tax Surcharge (the "mansion tax") announced in the November 2025 Budget, under which the VOA will assess approximately 150,000–200,000 properties worth over £2 million during 2026, using market data, property attributes, and Land Registry sales records — with no programme of physical inspections.
The principle that government can value residential properties at scale, using transaction records and statistical models rather than surveyors visiting every home, is no longer a matter of debate. It is current government practice.
The valuation hierarchy
The proposed methodology assigns each dwelling an assessed value through a two-tier system, applied in order:
Tier 1 — Last Land Registry transaction price, adjusted to valuation date. Where a property has a recorded sale in the Land Registry Price Paid Dataset (from January 1995 onwards), the most recent transaction price is adjusted forward to the valuation date using the ONS/Land Registry UK House Price Index for the relevant region. This yields an estimate of current market value anchored in an observed arm's-length transaction.
Tier 2 — 1991 Council Tax valuation, adjusted to valuation date. Where no Land Registry transaction exists — because the property has not been sold since before 1995, or is otherwise absent from the dataset — the property's existing Council Tax band midpoint value (based on the 1991 valuation) is adjusted forward using the same regional HPI series. Every property on the Council Tax valuation list already has an assigned band. The midpoint of that band, expressed in 1991 prices, provides a starting value that can be indexed forward using the cumulative house price change from 1991 to the valuation date.
In both tiers, once the assessed value is established at the valuation date, it remains fixed for the duration of the revaluation cycle (proposed at ten years), unless the property is sold. A sale during the cycle resets the assessed value to the transaction price, which then remains fixed until the next scheduled revaluation.
Coverage analysis: how much of the stock does each tier capture?
The practical viability of this approach depends on what proportion of England's 25.6 million dwellings fall into each tier. This determines both the accuracy of the aggregate tax base and the administrative burden on the system.
Tier 1 coverage — properties with a Land Registry transaction since 1995
The Land Registry Price Paid Dataset records all residential sales at market value lodged for registration since January 1995 — a span of 30 years. The dataset contains more than 24 million individual transaction records. However, because many properties have been sold more than once in this period, the number of unique properties with at least one recorded sale is substantially lower than the total transaction count.
Residential transaction volumes have varied significantly over the period. In peak years (2006–07, 2021), England saw upwards of 1.1 million transactions per year. In trough years (2009, 2023), volumes fell to around 800,000. A reasonable average over the full 30-year period is approximately 900,000–1,000,000 transactions per year in England alone.
At a turnover rate of roughly 4% of the dwelling stock per year, the probability that any individual property has been sold at least once over 30 years is approximately:
1 − (0.96)^30 ≈ 0.71, or roughly 70–75%
This estimate is consistent with the Land Registry's own figure of 24 million cumulative transactions against a stock of 25.6 million dwellings (acknowledging that repeat sales inflate the transaction count while new-build additions expand the denominator over time). A reasonable central estimate is that approximately 18–19 million dwellings in England have at least one Land Registry transaction record, with the most recent sale providing a directly observed market price.
These properties fall into Tier 1. For the large majority, the most recent transaction will be within the last 10–15 years, meaning the HPI adjustment required to bring the price to the valuation date is modest and well-calibrated by a robust regional index.
Tier 2 coverage — properties relying on indexed 1991 valuations
The remaining approximately 6–7 million dwellings have no recorded sale since 1995. These are predominantly properties that have been held by the same owner (or within the same family) for more than 30 years. They are disproportionately:
- older housing stock, particularly pre-war terraces and semi-detached homes in lower-value areas;
- properties inherited and retained within families;
- social housing transferred to housing associations before the Land Registry recording period;
- some rural and agricultural dwellings.
For these properties, the 1991 Council Tax valuation provides the only available administrative benchmark. Every dwelling on the Council Tax valuation list (25.8 million properties in England as at October 2025, per the DLUHC Council Taxbase) has an assigned band, and the midpoint of that band expressed in April 1991 values is a known quantity.
The adjustment from 1991 values to the valuation date is substantial — national median house prices have risen from approximately £55,000 in 1991 to approximately £290,000 by 2023, a factor of roughly 5.3 — but the regional HPI series published by ONS provides a well-established, externally validated index for making this adjustment at regional level, with data available at local authority level for finer calibration.
Comparison of approaches: transaction-only versus hybrid
To assess whether the hybrid approach (Tier 1 + Tier 2) is necessary, or whether a simpler transaction-only methodology could work, this section compares the two approaches across the key dimensions of coverage, accuracy, and revenue impact.
Approach A — Transaction-only (last Land Registry sale price, adjusted)
Under this approach, only properties with a Land Registry record would receive an assessed value. Properties with no recorded transaction would either receive no assessment (and pay no tax), or would need to be valued through some alternative mechanism — individual self-assessment, VOA desk-based valuation, or deferral.
Coverage: Approximately 70–75% of dwellings, or 18–19 million out of 25.6 million.
Strengths: Every assessed value is anchored in an actual arm's-length transaction. The data is comprehensive, publicly available, and continuously updated. HPI adjustment is straightforward. There is minimal scope for dispute over the starting price.
Weaknesses: The 25–30% of dwellings without a transaction record — some 6–7 million properties — would be excluded entirely. This creates both a fairness problem (long-term owners of valuable property pay nothing) and a revenue problem. Furthermore, the unrecorded properties are not randomly distributed: they are concentrated among older, longer-held properties, including some of the most valuable family homes in southern England. The revenue shortfall from excluding these properties would be material. If the excluded properties had a median value similar to the national average, the lost tax base would be roughly £1.5–2 trillion, corresponding to approximately £15–20 billion in foregone annual revenue at a 1% rate.
Verdict: A transaction-only approach is administratively simple but fiscally unacceptable and creates perverse incentives to avoid selling.
Approach B — Hybrid (transaction price where available, indexed 1991 value as default)
Under this approach, every dwelling on the Council Tax valuation list receives an assessed value: either from its most recent Land Registry transaction (Tier 1) or from its indexed 1991 Council Tax band midpoint (Tier 2).
Coverage: 100% of dwellings on the valuation list — approximately 25.8 million properties.
Strengths: Universal coverage from day one, using only data that government already holds. No property escapes assessment. No new data collection required for initial valuation. The 70–75% of properties valued through Tier 1 have assessments anchored in observed transactions. The 25–30% valued through Tier 2 have assessments that, while less precise, are based on a consistent national framework that has operated for over 30 years and is familiar to every household.
Weaknesses: The Tier 2 valuations are less accurate at the individual property level. The 1991 bands were broad (Band D covered properties valued at £68,001–£88,000 in 1991), and indexing forward using a regional average HPI cannot capture individual property improvements, extensions, or local micro-market variation. Some properties will be over-assessed relative to their true market value; others will be under-assessed. However, the direction of error is broadly neutral across the stock — and the system corrects itself automatically over time as properties are sold and move into Tier 1.
Revenue comparison: At a 1% annual rate on approximately 25.6 million dwellings with a total stock value of approximately £7.4 trillion (based on validated model estimates), the hybrid approach yields gross revenue of approximately £73.5 billion per year. A transaction-only approach, covering roughly 70–75% of the stock by value, would yield approximately £50–55 billion — a shortfall of nearly £20 billion that would eliminate the fiscal surplus on which the Universal Services programme depends.
Revaluation cycle
The proposed revaluation cycle is ten years. Between revaluations, assessed values are fixed unless a property is sold, in which case the transaction price becomes the new assessed value for the remainder of the cycle.
This approach has three advantages. First, it provides certainty to households: the annual tax bill is predictable and does not fluctuate with short-term market movements. Second, it minimises administrative cost: the VOA does not need to maintain a continuous valuation programme for all 25.6 million dwellings. Third, it creates a natural self-correcting mechanism: with approximately 4% of the stock transacting each year, roughly 40% of all properties will have updated transaction-based valuations within a single ten-year cycle, progressively improving the accuracy of the overall tax base without any administrative intervention.
At each ten-year revaluation, the same hierarchy applies: properties with a recent transaction use that price; remaining properties have their previous assessed value updated using the cumulative regional HPI change over the intervening period.
Over successive cycles, the proportion of properties in Tier 2 (indexed 1991 values) will decline steadily as the stock turns over. Within two or three revaluation cycles, the vast majority of properties will have transacted at least once during the era of comprehensive Land Registry records, and the system will converge toward near-universal transaction-based assessment.
Legal and institutional basis
This methodology requires no new primary legislation for the valuation mechanism itself. The key enabling provisions already exist:
Council Tax (New Valuations for England) Act 2006 gave the Secretary of State power to order revaluations via secondary legislation (subject to the affirmative procedure). IPPR has confirmed that "revaluation can be achieved under existing legislation, meaning it could be passed quickly if the government chooses to act."
HM Land Registry Price Paid Data is already published as open data under the Open Government Licence, freely available for any purpose including taxation.
The UK House Price Index is an official National Statistic produced jointly by ONS, Land Registry, and the VOA, providing the regional and local authority adjustment factors the methodology requires.
The Valuation Office Agency already maintains the Council Tax valuation list, operates the Automated Valuation Model deployed in Wales, and is preparing to value 150,000–200,000 properties for the High Value Council Tax Surcharge during 2026. The institutional capacity and technical infrastructure exist.
New primary legislation would be required for the property tax itself — establishing the 1% rate, an enabling power for local authorities to levy a second-home or additional-property surcharge, collection mechanisms, deferral provisions, and the replacement of Council Tax and Stamp Duty. But the valuation methodology can operate entirely within existing powers and data infrastructure.
Implementation timeline
The following timeline assumes a decision to proceed in Year 1 of the programme (coinciding with the political sequencing set out elsewhere in this paper, in which visible Universal Services benefits are delivered before the tax reform is announced).
Months 1–6: The VOA matches the Council Tax valuation list against the Land Registry Price Paid Dataset to classify every dwelling as Tier 1 or Tier 2. For Tier 1 properties, the most recent transaction price is identified. For Tier 2 properties, the 1991 band midpoint value is extracted. This is a data-matching exercise using existing administrative databases — conceptually straightforward, operationally intensive at scale but well within the VOA's demonstrated capability.
Months 6–12: Regional HPI adjustment factors are calculated and applied. Each property receives a provisional assessed value. The VOA applies its existing AVM capability — proven at scale in Wales — to sense-check the results, flagging statistical outliers and properties at band margins for review. Provisional assessments are published.
Months 12–18: A formal challenge and review period allows homeowners to dispute their assessed value. The challenge process mirrors existing Council Tax band challenge procedures. To prevent frivolous or speculative disputes, challenges must assert a discrepancy of more than 10% of the provisional assessed value. Within that threshold, challenges are essentially limited to arguing that the recorded transaction was not at market value, that the property has been materially altered since the transaction, or that the Council Tax band allocation was incorrect.
Month 18–24: Final assessments are confirmed. The first annual property tax bills are issued. The system is operational.
This timeline is consistent with the VOA's own schedule for the Wales revaluation, where a valuation phase beginning September 2026 is expected to produce confirmed bands in time for April 2028 — a comparable 18-month window for 1.5 million properties. Scaling to 25.6 million English properties is more demanding, but the methodology proposed here is substantially simpler than the full AVM-based revaluation being undertaken in Wales, because it does not require model-based estimation for most properties — it simply reads an observed price from the Land Registry and multiplies by a published index.
Precedent and consensus
The approach proposed here is consistent with the direction of travel across the full range of recent reform proposals:
Fairer Share (Andrew Dixon) proposes annual automated valuations linked to market data, arguing that "concerns about valuations are a red herring" and that with 77% of households seeing lower bills, "most people will take their cash and run before they worry about their valuation."
IPPR (2021, 2025) confirms that "most revaluation work today is done using robust statistical modelling rather than on-the-ground inspections, and there is valuable experience to draw from the work undertaken by the Valuation Office Agency in Wales."
Onward (Tim Leunig, 2025) advocates "a more efficient property valuation process," noting that below £500,000 homes are simpler to value because they are more homogeneous.
John Muellbauer (Oxford, 2025) points to "the Automated Mass Valuation model based on transactions data from the Land Registry (currently being applied in Wales by the VOA)" as offering "considerably lower costs and greater speed of valuation per property."
The Mirrlees Review (IFS, 2011) proposed a Housing Services Tax proportional to up-to-date values, and the broader IFS position has long been that transaction-based data provides the foundation for modern property taxation.
The UK government itself, through the High Value Council Tax Surcharge, has committed to automated, desk-based valuation using Land Registry data and the VOA's AVM for implementation in 2028.
The question is no longer whether automated, transaction-based valuation is technically feasible. The government is already doing it. The question is whether the political will exists to apply the same proven methodology to the full dwelling stock.
Summary
The proposed valuation methodology requires no new data collection, no physical inspections, no new institutional capacity, and no new primary legislation for the valuation process itself. It uses the Land Registry Price Paid Dataset — the world's largest open property transaction database — combined with the UK House Price Index and the existing Council Tax valuation list, to assign an assessed value to every dwelling in England within 12–18 months of a decision to proceed.
For approximately three-quarters of dwellings, the assessed value is anchored in an observed market transaction. For the remainder, the existing 1991 Council Tax valuation, indexed forward using a nationally consistent methodology, provides a reasonable and defensible starting point that improves automatically as the stock turns over.
The approach is conservative, transparent, and challengeable. It builds on infrastructure and methods already accepted and deployed by government. It achieves universal coverage without the cost, delay, or political controversy of a full physical revaluation. And it produces a tax base sufficient to fund the fiscal programme set out in this paper.