The Rising Challenge of Leasing London Offices Without Air Conditioning

The soaring temperatures across London are becoming a significant factor in the city’s commercial real estate market, shifting tenant preferences and creating challenges for landlords. Real estate experts report that office buildings lacking air conditioning (AC) are facing an uphill battle to attract tenants, as rising summer temperatures transform the workplace landscape. As climate change continues to escalate, the demand for comfortable, climate-controlled environments is no longer just a luxury; it’s becoming a necessity.

In recent weeks, London has experienced record-breaking heat waves, with temperatures climbing to unprecedented highs. According to Chris Cummings, a director at Savills, the absence of cooling options like air conditioning has become a “red flag” for prospective buyers and tenants. As the climate crisis deepens, the implications for office leasing and property values in the capital are profound and far-reaching.

Air Conditioning: A Necessity or a Luxury?

Traditionally, air conditioning was viewed as an amenity; however, it is increasingly being recognized as a basic requirement for modern office buildings. A study by Knight Frank revealed that demand for London offices with AC already outstripped that for properties without it as early as 2024. With temperatures in London surpassing 30°C (86°F) more frequently—four times as often as in the 1980s—the gap in desirability for air-conditioned buildings is expected to widen even further.

Dominic Pozzoni, head of national offices at Colliers, notes that offices lacking AC will find it “extremely challenging to let” as the city endures more frequent heat waves. The Mayor of London has issued warnings about the city’s vulnerability to rising temperatures, highlighting the need for significant investment to adapt buildings for a hotter climate. The financial implications for landlords are considerable, and proactive measures are essential for maintaining property values.

The Impact of Rising Temperatures on Productivity

The effects of high temperatures on employee productivity cannot be overstated. Several studies indicate that once indoor temperatures exceed 25°C (77°F), there is a significant decline in work performance, particularly in tasks requiring high cognitive functions. A meta-analysis conducted in 2025 reviewed 30 individual studies and found that as temperatures rise, workers experience lower accuracy levels in their tasks, especially when exposed to elevated temperatures for extended periods.

For instance, a 2006 study suggested that productivity begins to decline at temperatures above 23°C (73°F), with the optimal temperature for peak performance being around 22°C (72°F). Given the recent record temperatures in London—35.1°C in May and 37.7°C in June—employers and building owners must recognize the urgent need for climate control systems to maintain both comfort and efficiency.

Investment Challenges for Landlords

Landlords of older properties face unique challenges when it comes to upgrading their facilities. Many buildings, particularly those constructed before the advent of modern cooling technologies, may not be designed to accommodate air conditioning units. Charlotte Ashton, head of London leasing at Colliers, points out that retrofitting older buildings can be both challenging and costly. For period buildings with complex layouts, the installation of condenser units often requires extensive planning and can be prohibitively expensive.

In some cases, landlords resort to temporary solutions like freestanding AC units in order to secure deals, but these measures are often insufficient in the face of rising tenant expectations. The long-term viability of these properties may be at stake as tenants prioritize modern amenities that ensure a comfortable working environment.

Landlords vs. Tenants: Negotiation Dynamics

The evolving rental landscape is characterized by shifting negotiation dynamics between landlords and tenants. As demand for air-conditioned spaces increases, tenants are becoming more discerning, often negotiating terms to include acceptable temperature parameters before signing leases. Charles Ingram Evans, head of project consultancy at Knight Frank, emphasizes the importance of addressing these concerns upfront, particularly for American firms accustomed to a higher standard of working conditions.

As tenants increasingly express their preferences for modern, temperature-controlled office spaces, landlords are faced with the reality that failing to adapt could result in prolonged vacancies and financial repercussions. The perception that older London buildings are inferior to their U.S. counterparts is becoming more pronounced, and landlords must address these perceptions to remain competitive.

Future Outlook: Adapting to a Warming World

The outlook for London’s office market is one of adaptation and transformation. With climate change expected to bring even more intense heat waves, the urgency for building owners to upgrade their properties is pressing. The U.K. Health Security Agency has warned that heat waves are likely to become more frequent and severe, further underscoring the need for effective cooling solutions.

Landlords who proactively invest in modern cooling technologies and energy-efficient designs may find themselves better positioned to attract tenants and maintain property values. As the demand for sustainable, climate-resilient buildings continues to grow, the commercial real estate market in London will have to evolve or risk obsolescence.

Key Takeaways

• Demand for London office spaces without AC is declining sharply as temperatures rise.
• Productivity drops significantly in high-temperature environments.
• Landlords face challenges and costs when upgrading older buildings to include AC.
• Negotiations between landlords and tenants are increasingly focused on temperature control.
• The future of London's office market hinges on adaptation to climate change.

Frequently Asked Questions

Why is air conditioning becoming a necessity for office spaces in London?

As climate change leads to rising temperatures, particularly during the summer months, air conditioning has shifted from being a luxury amenity to an essential requirement for tenant comfort and productivity. Offices without adequate cooling face decreased interest from prospective tenants, as employees are less productive in hot environments. This trend is likely to continue as heat waves become more frequent and intense.

What are the economic implications for landlords of buildings without AC?

Landlords of properties lacking air conditioning face the risk of extended vacancies and diminished rental income. As tenants increasingly prioritize climate control, these properties may become less attractive, leading to potential depreciation in value. The costs associated with retrofitting older buildings to install cooling systems can also be significant, creating financial burdens for property owners.

How do rising temperatures affect employee productivity?

Research shows that employee productivity significantly declines when temperatures exceed 25°C (77°F). High temperatures can lead to lower accuracy and slower response times, particularly in tasks requiring cognitive effort. This decline in productivity can result in employees preferring to work from home or seeking workplaces with better climate control, further impacting the attractiveness of properties without AC.

What steps can landlords take to improve the marketability of their properties?

Landlords can invest in modern cooling technologies and energy-efficient designs to enhance the comfort of their buildings. Additionally, proactive communication with potential tenants regarding temperature control measures and improvements can help mitigate concerns. By creating environments that prioritize employee comfort, landlords can attract and retain tenants in a competitive market.