Between 1996 and 2013, private landlords were responsible for approximately 83% of the increase in England’s housing stock, a fact that challenges common assumptions about the private rented sector’s impact on housing supply. This significant contribution came not only from purchasing existing homes but also through renovation, conversion, and investment in new developments.

Private landlords’ pivotal role in housing growth

During the period from 1996 to 2013, England’s housing stock grew from 20.3 million to 23.3 million homes. Within this expansion, the private rented sector saw an increase from around 2.0 million to 4.5 million homes. This means that roughly 2.5 million of the additional homes were within the private rented sector, accounting for about 83% of the overall growth.

This statistic was brought to wider attention in 2016 by David Knox, writing under the pseudonym “Appalled Landlord,” who highlighted it in an open letter to a Member of Parliament. His insight challenges the narrative that the private rented sector simply diverts homes away from first-time buyers, instead showing that landlords played a major role in expanding housing availability.

Factors behind the rapid expansion of the private rented sector

The growth of the private rented sector in the late 1990s and early 2000s was driven by several structural changes. The introduction of buy-to-let mortgages made it easier for individuals to invest in rental properties, as lenders recognised rental income as a reliable source to support borrowing. At the same time, demographic shifts such as increased labour mobility, rising student numbers, and delayed home ownership boosted demand for rental accommodation.

However, demand alone does not increase housing supply. What changed was the willingness of thousands of small investors to deploy capital into housing. Many landlords renovated existing properties or brought neglected homes back into use, significantly increasing the number of homes available to rent. This distributed investment model, involving numerous individual decisions, contributed substantially to housing supply.

How landlords increased housing supply in practical terms

Landlords did more than simply buy completed homes to let out. Renovation of empty or neglected properties was common, returning otherwise unused homes to the market. Conversion of large houses into Houses in Multiple Occupation (HMOs) also increased the number of households accommodated within existing buildings, providing housing for students, young professionals, and migrant workers.

Additionally, landlords supported new developments by purchasing properties off-plan, helping developers secure financing and proceed with construction. Some also converted commercial buildings or subdivided larger properties into smaller units, creating additional dwellings without the need for entirely new builds. Although these projects may seem small individually, collectively they made a significant impact on housing availability.

Changes in the investment environment since the expansion years

The favourable conditions that supported private rented sector growth between the late 1990s and early 2010s have shifted. Over the past decade, policy reforms have altered the financial and regulatory landscape for landlords. These include changes to mortgage interest tax relief, increased Stamp Duty Land Tax on additional properties, tighter lending standards for buy-to-let mortgages, and expanded licensing and regulatory requirements.

While each measure had specific objectives—such as financial stability, raising tax revenue, or improving housing standards—the combined effect has increased the risk and uncertainty of residential property investment. Rising interest rates and construction costs have further raised capital requirements, leading many smaller landlords to slow investment, pause acquisitions, or sell properties. Consequently, the rapid growth of the private rented sector has slowed, although it remains a vital housing source for millions.

Investor confidence and its impact on housing supply

Housing supply is often viewed through the lens of planning policy and large-scale developments, but the private rented sector’s experience demonstrates the importance of numerous smaller investments. Thousands of individual investors renovating homes, converting buildings, and supporting developments can collectively drive significant housing growth.

Investment in housing, like other sectors, follows confidence. When investors perceive the sector as stable and profitable, capital flows more freely. Conversely, uncertainty or increased risks cause investment to slow. Understanding what conditions encourage or discourage landlord investment is therefore crucial for housing policy.

What would encourage landlords to invest again?

The expansion of the private rented sector was not the result of direct government instruction but stemmed from thousands of individuals finding housing investment economically viable and socially acceptable. This was supported by a tax system broadly aligned with other business investments, accessible but prudent mortgage lending, and a relatively stable regulatory framework.

Predictability is key for long-term investments in assets held over decades. Investors do not require guaranteed returns but need clarity and consistency in the rules governing their investments. Frequent or unpredictable policy changes tend to cause investors to pause, reducing the flow of capital into housing.

The experience of the past decade confirms that when returns become less predictable or risks increase, investment slows. Conversely, a stable environment encourages capital to return to the sector.

Lessons for housing policy

While the private rented sector alone cannot solve Britain’s housing shortage, historical evidence shows that private landlords once made a substantial contribution to increasing housing availability. This was achieved not through large-scale programmes but through numerous individual decisions to renovate, convert, and invest in properties.

For policymakers aiming to increase housing supply, it is worth considering whether the current policy environment encourages or discourages this kind of distributed investment. The answer to this question may be more important than often acknowledged in housing debates.

Source: Based on reporting from Property118

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