London Office Market Review 2026

Overview of Current Market Conditions

The London office market enters 2026 in a very different position from where it stood twelve months ago. The vacancy rate, which peaked at around 10.6% in early 2025, has since fallen to approximately 7.4% as of February 2026, according to data compiled from Savills, Cushman & Wakefield, and CoStar ^[1]. This improvement reflects stronger absorption across higher-specification buildings, even as total availability remains above long-term averages at close to 26.3 million sq ft.

Leasing activity proved resilient through 2025. Annual take-up reached between 10.6 and 12.1 million sq ft depending on the source, making it Central London’s strongest year since the start of the pandemic ^{[2] [3]}. Knight Frank recorded 12.1 million sq ft across 1,400 deals, with a surge in large-scale corporate expansions propelling the figures to their highest post-pandemic level ^[3]. The share of Grade A space in those transactions hit a record 74%, up from a pre-pandemic average of 59% ^[4]. For organisations reviewing their office costs in London, this concentration of demand at the top of the market carries significant implications for both pricing and availability.

For landlords, the picture remains sharply divided by asset quality. The gap between Grade A and Grade B performance widened sharply through 2025, with premium buildings in the West End and City Core achieving record pricing while secondary stock saw year-on-year rent declines of up to 19%. Prime rents reached record levels of £185 per sq ft in the West End and £102.50 per sq ft in the City, with a record 170 deals signed above £100 per sq ft ^[3]. For a full breakdown of current pricing by submarket, see our dedicated guide to office rents in London. That pattern reinforces the growing penalty for buildings that do not meet modern occupier expectations around sustainability, amenity provision, and location.

Key London Office Market Stats (Q4 2025 / Early 2026):

Data sources: [2] JLL Central London Office Market Dynamics Q4 2025, [3] Knight Frank London Series 2026, [4] Cushman & Wakefield Marketbeat Q4 2025, [5] Savills Central London Market Watch Q4 2025

Leasing and Vacancy Trends

Leasing across Central London is no longer recovering. It has recovered. The 10.6 million sq ft transacted in 2025 according to JLL exceeded both the prior year and the long-term trend ^[2], with Q4 alone delivering 2.88 million sq ft, some 17% above the ten-year quarterly average ^[4]. Knight Frank’s wider measure, which includes a broader deal scope, recorded 12.1 million sq ft across 1,400 deals, the capital’s strongest performance since the start of the pandemic ^[3]. Of the 98 deals over 20,000 sq ft signed in 2025, 70 were expansionary, delivering 2.9 million sq ft of net absorption and confirming that large businesses took materially more space than they vacated ^[3].

The real story, however, lies in the quality of space being absorbed. Around 74% of 2025 leasing activity involved Grade A offices, a proportion Cushman & Wakefield describes as the highest on record ^[4]. This flight to quality has created a genuine supply constraint in the most desirable locations. The City Core had just 1.1 years of Grade A supply remaining at the end of 2025, against a ten-year average of 1.7 years. In Mayfair and St James’s, that figure fell to 0.7 years ^[4]. Knight Frank data paints an even sharper picture: vacancy rates for new, high-specification offices now stand at just 0.3% in the City Core and 0.8% in the West End Core ^[3]. For organisations planning an office fit-out in these submarkets, the practical implication is clear: decisions need to be made earlier and with greater precision.

The divergence between locations continues to widen. Vacancy in the City Core stood at 5.7% at the end of 2025, down 240 basis points on the ten-year average ^[5]. Meanwhile, fringe areas such as Hammersmith (26.4%) and Vauxhall/Battersea (18.1%) face stubbornly high availability ^[1]. Southbank has been a standout performer, with take-up rising 45% year-on-year, driven by high-profile deals including LEGO’s acquisition of nearly 192,000 sq ft at 76 Southbank and ServiceNow’s pre-let at Edge London Bridge ^[5].

Major occupier moves continue to reshape the map. Law firm Herbert Smith Freehills Kramer took 238,000 sq ft at 1 Appold Street, while Proskauer Rose expanded onto the 46th floor of 8 Bishopsgate, paying £145 per sq ft on a 13-year lease ^[5]. The largest deal of 2025 was Squarepoint’s 400,000 sq ft lease at 65 Gresham Street, a firm founded only in 2014, highlighting London’s continued appeal to fast-growing businesses ^[3]. Insurance and financial services remained the largest source of demand, accounting for 31% of Central London take-up, with strong demand from hedge funds, asset management and insurance firms ^[5]. Law firms leased 13.3% more office space in London compared with 2024, totalling 828,450 sq ft, with US firms accounting for five of the top legal sector deals over 100,000 sq ft in the past five years ^[6]. For those considering financial services office design, these transactions confirm that client-facing environments in prime locations remain non-negotiable.

Investment and Development Trends

After a subdued 2024 that saw just £6.2 billion invested in London offices, 2025 delivered a strong rebound. Total investment volumes reached approximately £9.3 to £9.8 billion, representing a rise of between 45% and 61% year-on-year depending on the source ^{[2] [3] [4]}. Q4 2025 was particularly active, with £3.3 billion of transactions completing, the highest quarterly figure since Q3 2022 and well ahead of the five-year average ^[4]. There were 25 deals over £100 million, including eight above £250 million, compared with none in 2024 ^[3].

The investor profile has also shifted. Institutional investors returned decisively, representing almost 40% of all office transactions, 50% of £100m-plus deals, and 65% of £250m-plus transactions ^[3]. Norway’s sovereign wealth fund, Norges Bank, was among the most active participants, committing over £1 billion across multiple London portfolios, including a £570 million purchase of a 25% stake in the Covent Garden Estate ^[4]. Knight Frank has tracked a 25% increase in sovereign wealth capital targeting London offices for 2026 ^[3]. Knight Frank forecasts that total London office investment could reach £12 billion in 2026, reflecting improved confidence and stabilising yields ^[3].

Prime yields held steady through the final quarter of 2025 at 3.75% in the West End and 5.50% in the City ^[4]. With inflation easing and further base rate cuts anticipated, the outlook for capital values is more favourable than at any point since 2022. Buildings that meet strict sustainability and energy performance standards continue to attract the strongest investor interest.

On the development side, approximately 13.5 million sq ft of space was under construction at the end of Q4 2025, with 37% already pre-let ^[4]. The development pipeline is thinning, however, and this is expected to become a defining characteristic of the market over the next two to three years. Since 2019, 36.1 million sq ft of new and refurbished take-up has outstripped completions of just 27.6 million sq ft, a structural imbalance that has driven vacancy for best-in-class buildings below 1% ^[3]. Higher build costs, tighter funding conditions, and longer planning processes have made speculative construction more difficult. The BCIS index forecasts continued build cost increases through 2026 and 2027, and with capital values recovering only modestly, rental growth will need to do the heavy lifting. More than half of future supply is now refurbishment-led, as landlords now favour upgrading existing buildings over ground-up development. Knight Frank estimates that upgrading London’s ageing office stock could create £11.4 billion in annual rental income and £262 billion of investment value ^[7]. This trend towards office refurbishment reflects both the economics and the pressure to improve sustainability performance, with retrofitted assets outperforming traditional new builds in both lease-up speed and yields.

Workplace Trends, Fit-Out Implications & Future Outlook

The Quality Premium and What It Means for Fit-Out

The concentration of leasing activity in Grade A space is not simply a preference. It has become a requirement. Occupiers entering new leases are making decisions that will shape their working environments for ten to fifteen years, and the buildings they choose need to support hybrid working patterns, attract and retain talent, and meet tightening environmental regulations. The result is that fit-out quality now directly influences leasing competitiveness. Lettings in recently developed or comprehensively refurbished offices accounted for 77% of space acquired during 2025, while space let in BREEAM Outstanding or Excellent buildings represented 64% of take-up, up 5% on 2024 ^[5]. Landlords offering Cat A+ or fully fitted space are leasing faster and achieving stronger rents, while shell-and-core buildings in secondary locations face longer void periods.

For tenants, the implication is that the fit-out investment itself has become a strategic consideration, not merely a cost to be managed after the lease is signed. Engaging with a design-and-build partner early in the process, ideally alongside the property search, helps ensure that the workspace brief, budget, and programme align with what the market can offer. In a project for PJT Partners in Mayfair, this integrated approach was central to delivering 48,000 sq ft of workspace that met the exacting standards of a global advisory firm within a competitive timeline.

Sustainability as a Market Requirement

Energy efficiency and sustainability considerations have moved from aspiration to reality in leasing and investment decisions. During 2025, both tenant demand and investor activity consistently favoured buildings with credible environmental strategies. Regulatory requirements, lender scrutiny, and occupier expectations are now closely aligned, leaving little tolerance for assets without a clear improvement pathway. At the end of Q3 2025, 47% of available space carried a BREEAM rating of Excellent or Outstanding, up 7% on the prior year.

The approaching MEES EPC B rating requirement, expected to apply by 2030, is accelerating a wave of refurbishment and retrofit activity across the capital. Knight Frank’s analysis found that 80% of regional office space occupied by leading UK listed companies holds an EPC rating below the B standard required by 2030 ^[8]. Separately, an estimated 80% of London’s office buildings are below this minimum standard and will need to be upgraded, an equivalent of 15 million sq ft per annum ^[9]. CBRE estimates that 58% of office stock in Central London specifically currently falls below EPC B ^[10]. Smart office design that incorporates energy-efficient lighting, modern HVAC systems, and real-time performance monitoring is no longer a point of differentiation. It is a baseline expectation.

Savills data shows a clear rental premium for buildings with strong sustainability credentials. Rents achieved on BREEAM-certified Excellent or Outstanding buildings consistently outperform uncertified stock, reinforcing the commercial case for investment in building performance ^[5].

Flexible Workspace and Hybrid Working

Flexible workspace now accounts for around 10% of total Central London office stock, up from 6% before the pandemic. Rather than displacing conventional leasing, flex space has settled into a defined role within the market, used by organisations to manage growth, portfolio risk, and shorter-term operational needs alongside longer lease commitments. Hybrid working patterns have stabilised at broadly three to four in-office days per week, sustaining demand for high-quality space while keeping total footprints below pre-pandemic levels. The growing traction of four-day-a-week office attendance models among major employers has reintroduced pressure on space planning ^[3]. The effect is a market characterised by smaller but higher-specification requirements. Occupiers taking sub-10,000 sq ft deals drove more than 55% of transactions in the West End during 2025 ^[11], while re-gears now account for 39% of all London office transactions, with 1.7 million sq ft currently under negotiation ^[3]. For those exploring different procurement routes, understanding the design-and-build approach versus traditional methods can materially affect timelines, costs, and outcomes when securing smaller, premium spaces.

Market Polarisation and What It Means for Occupiers

The performance gap between prime and secondary office stock widened considerably through 2025, and this divergence is expected to persist into 2026 and beyond. Grade A buildings in core locations recorded strong year-on-year growth, while Grade B stock in both the City and West End saw rents decline. Knight Frank’s analysis shows that prime rents in the City Core have risen over 41% since 2019, while prime West End rents have grown over 60% in the same period ^{[3] [7]}. For a detailed comparison of current pricing across all London submarkets, see our guide to office rents in London.

The practical consequence for occupiers is that delaying decisions carries a growing cost. Organisations requiring more than 100,000 sq ft are now committing to space an average of four years ahead of lease expiry, up from under three years in 2022 ^{[5] [3]}. Between now and 2030, up to 50 million sq ft of London office leases are set to expire, intensifying competition in submarkets such as Marylebone, Soho and the City Core, all of which currently have less than 15 months of supply remaining ^[3]. This reinforces the importance of space planning that aligns commercial objectives with realistic market timelines. For organisations weighing the costs involved in a move or refurbishment, a clear understanding of fit-out costs alongside these market dynamics is essential to building a sound business case.

Forecast for 2026 and Beyond

The outlook for 2026 points to a market that is stabilising around quality rather than quantity. A handful of related forces will shape conditions over the next twelve to eighteen months.

Supply constraints will intensify. New office completions are forecast to fall sharply in 2026, with only around 1.2 million sq ft of new space expected, a roughly 40% decline on 2025. Of scheduled 2026 completions, approximately 70% are already pre-let, leaving very limited open-market options for occupiers. Speculative development starts have slowed, and the pipeline for 2027 and 2028 remains thin. Savills notes that 43% of the pipeline scheduled for completion between now and 2027 is already pre-let ^[1]. Multiple forecasters now predict a structural undersupply of Grade A office space from the latter half of the decade.

Pricing pressure will persist. Savills forecasts average prime growth of 4.6% for the City and 4.3% for the West End in 2026, supported by constrained supply and sustained competition for the best buildings. Knight Frank’s economic modelling shows that the headline rents required for new developments to be financially viable are estimated at £91.50 per sq ft in the City Core and £138.00 per sq ft in the West End Core, both below current market levels, illustrating how far the pricing environment has shifted and why new speculative supply is slow to come forward ^[7]. For the latest submarket figures, see our regularly updated guide to London office rents.

Investment will continue to grow. Knight Frank forecasts London office investment reaching £12 billion in 2026 ^[3]. Almost 90% of global investors (by assets under management) plan to increase their commercial real estate investment in 2026, with $144 billion of planned deployment globally ^[12]. Over the next five years, London is projected to add around 186,000 office-based jobs, far ahead of Paris (51,500), Madrid (81,400), Berlin (33,500), and Amsterdam (30,600) ^[13]. Eight deals exceeding £100 million were already under offer at the start of the year.

The retrofit wave will accelerate. With the 2030 MEES deadline approaching and new construction economically constrained, refurbishment will dominate the development pipeline. Buildings that are upgraded to meet modern sustainability, amenity, and workplace flexibility standards will attract both occupier interest and investor capital. Those that cannot be economically upgraded are more likely to convert to alternative uses, reducing total office supply and further supporting rent resilience.

For organisations planning workplace changes, the window of opportunity to secure the best space is narrowing. The organisations that plan ahead, engage with relocation planning early, and commit to workspace strategies grounded in clear operational and commercial objectives will be best positioned in a tightening market.

K2 Space has delivered workplace transformations across London for more than 20 years. Our integrated approach brings together design, fit-out, furniture, and move management under a single team, a defined timeline, and a fixed budget. From investment firms to international law practices, our work spans the sectors driving London’s office market forward.