London Strengthens Its Lead as UK Regional Office Development Falls to Historic Low, CoStar Reports
Office construction activity across the UK’s regional markets has dropped to its lowest level in at least two decades, highlighting a growing imbalance between London and the rest of the country, according to new research released by CoStar, a leading provider of commercial real estate information, analytics, and online property marketplaces.
The latest preliminary figures for the second quarter of 2026 reveal a significant slowdown in new office development outside the capital. While London continues to attract substantial investment in premium office projects, regional markets are experiencing a sharp decline in construction starts as developers remain cautious amid challenging economic conditions, higher financing costs, and evolving occupier demand.
The report indicates that annual office construction starts across the UK regions fell below five million square feet during the second quarter of 2026. This marks the first time new regional office development has dropped beneath that threshold since at least 2010, underscoring the extent of the slowdown.
The current level represents a dramatic contrast to 2019, when more favorable market conditions supported approximately 16 million square feet of annual office construction starts across the country. At that time, lower borrowing costs, stronger business confidence, and healthy leasing activity encouraged developers to launch new commercial office projects at a much faster pace.
Since then, however, the office sector has undergone significant changes driven by economic uncertainty, shifting workplace preferences, rising construction costs, and more selective investor sentiment. These factors have collectively reduced the appetite for speculative office development, particularly outside London’s strongest commercial districts.
According to Patrick Scanlon, Senior Director of Market Analytics at CoStar Europe, the decline in development activity has been widespread across regional markets.
He noted that office construction starts across the UK’s regional cities are now nearly 59% below their average levels recorded over the past decade. London has also experienced a slowdown, with construction starts approximately 57% below the 10-year average. However, the capital continues to outperform regional markets because of stronger occupier demand and higher rental growth for premium office space.
Scanlon explained that London’s prime office market continues to provide developers with greater confidence to pursue speculative construction projects. Strong demand for modern, high-quality office buildings in central locations has supported rising rental values, improving the financial viability of new developments despite higher construction and financing costs.
Premium office buildings offering excellent transport connections, modern amenities, sustainability features, and flexible workplace environments remain particularly attractive to tenants seeking to encourage employees back into offices while meeting increasingly stringent environmental standards.
This sustained demand for high-quality buildings has reinforced London’s position as the UK’s dominant office development market.
Although new office construction starts have fallen sharply, CoStar’s report shows that the overall volume of office space currently under construction across the UK actually increased during the second quarter of 2026.
This apparent contradiction reflects unusually low completion levels recorded during the first half of the year rather than a resurgence in new development activity.
Many large office schemes that began construction in previous years remain underway, contributing to higher total construction volumes even as relatively few new projects enter the pipeline.
However, analysts expect this temporary increase to reverse during the second half of 2026 as a substantial number of ongoing projects reach completion.
Scanlon said construction activity is expected to resume its downward trajectory at an even faster pace over the remainder of the year.
Nearly one-third of all office space currently under construction across the UK is scheduled for completion before the end of 2026. Because the number of new projects entering construction remains limited, completed developments are expected to significantly outpace new construction starts during the same period.
As a result, the total volume of office space under construction is likely to decline noticeably over the coming months.
The data also highlights the increasingly pronounced divergence between London’s office development market and those of the UK’s regional cities.
In recent years, London has steadily strengthened its dominance in commercial office construction, attracting a growing share of development activity while regional markets continue to contract.
According to CoStar’s analysis, London accounted for roughly half of all office space under construction across the UK in 2021.
By the middle of 2026, that figure had risen to almost three-quarters of the national development pipeline, representing one of the highest concentrations ever recorded.
The growing disparity illustrates how developers are increasingly concentrating investment within London’s most resilient commercial locations while adopting a more cautious approach toward regional office projects.
For many investors, London’s larger tenant base, deeper capital markets, stronger rental growth, and greater liquidity continue to provide greater confidence despite ongoing market uncertainty.
Meanwhile, construction activity throughout regional markets has continued to decline.
Office space currently under construction across the UK’s regions has fallen below six million square feet, representing only around 0.5% of total regional office stock.
In contrast, office space under construction in London now represents approximately 3.7% of the capital’s total office inventory, highlighting the significantly higher level of ongoing investment.
The figures suggest that developers remain considerably more willing to commit capital to new office projects in London than in regional cities, where demand recovery has generally been slower and financial returns less certain.
The slowdown also reflects broader structural changes affecting office markets across the UK.
The widespread adoption of hybrid working has prompted many occupiers to reassess their space requirements, often reducing overall office footprints while prioritizing higher-quality buildings that better support employee collaboration and workplace experience.
As a result, demand has become increasingly concentrated in modern, sustainable, and well-connected office buildings capable of meeting evolving tenant expectations.
Older buildings in secondary locations have faced greater leasing challenges, making speculative development in many regional markets more difficult to justify economically.
Developers are therefore focusing investment on projects that offer strong environmental credentials, advanced workplace technology, flexible layouts, and prime urban locations where long-term tenant demand is expected to remain resilient.
Economic factors have also played an important role in slowing development activity.
Higher interest rates have increased financing costs, while elevated construction expenses and ongoing supply chain pressures have reduced project profitability. Combined with greater uncertainty surrounding future office demand, these conditions have encouraged many developers to delay or postpone new projects until market conditions improve.
Despite these challenges, London’s prime office sector continues to demonstrate relative strength, supported by limited availability of premium Grade A office space and sustained demand from financial institutions, professional services firms, technology companies, and international businesses seeking high-quality workplaces.
The contrast between London’s resilience and the weakness of regional markets underscores the changing dynamics of the UK’s commercial real estate sector.
While development activity remains subdued nationwide compared with historical averages, the capital continues to attract the majority of new investment, widening the gap between London’s office market and those of the UK’s regional cities.
As a significant proportion of existing projects approach completion during the remainder of 2026 and relatively few new developments begin construction, industry observers expect overall office construction activity to remain under pressure.
The latest CoStar data suggests that unless financing conditions improve and occupier demand strengthens across regional markets, London is likely to maintain its dominant position in UK office development while regional construction activity continues to operate at historically low levels.
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