London construction did not experience a simple recovery or a uniform slowdown during the first half of 2026. Instead, the capital’s market separated more sharply by sector, funding strength and exposure to risk. Housing delivery weakened, regulatory approvals remained a critical programme issue and contractor insolvency continued to threaten live projects. At the same time, major infrastructure, premium offices, complex refurbishment and selected regeneration schemes continued to attract capital.
The defining story of January to June was therefore not that London stopped building. It was that projects were being filtered. Schemes with strong institutional backing, clear occupier demand, public investment or tightly controlled delivery models continued to move. Marginal residential projects, highly leveraged developments and contractors carrying historic liabilities faced a far more difficult market.
The period also showed how the consequences of the Building Safety Act are moving beyond technical compliance. Gateway 2 decisions affected when projects could start, evidence quality became a direct commercial issue and the courts demonstrated that historic building-safety liabilities could reach beyond the original contracting entity into wider corporate groups.
The first half of 2026 defined a two-speed London construction market: housing delivery and contractor balance sheets remained under severe pressure, while infrastructure, prime offices, retrofit and strategically funded regeneration continued to create substantial work. The central question was no longer whether London had a pipeline, but which projects could convert planning, policy and investment into construction certainty.
Jump to: By the numbers | The market split | Housing delivery crisis | Building Safety Regulator | Ardmore and liability | HS2 to Euston | Office and retrofit market | Projects that still moved | East London capacity | What H1 revealed | Second-half outlook | FAQ
By the Numbers: London Construction in the First Half of 2026
| Indicator | Reported Position | Construction Reading |
|---|---|---|
| Gateway 2 decisions in the 12 weeks to 30 May 2026 | 358 decisions; 75% approval rate | The regulator increased throughput, but approval timing and submission quality remained material programme risks. |
| London share of Gateway 2 decisions in the same period | 65% | London remained the dominant higher-risk-building workload for the Building Safety Regulator. |
| Residential units represented by live Gateway 2 cases | 38,775 units nationally | A large volume of housing remained dependent on regulatory determination before construction or major building work could proceed. |
| Affordable Housing Programme 2021–26 starts by the March deadline | 14,335 starts against a revised 17,800–19,000 target | Even the reduced programme target was missed, confirming that London’s housing problem was one of delivery rather than ambition alone. |
| Initial City Hall Developer Investment Fund allocation | £324m | Government and City Hall moved from diagnosis to direct financial intervention in stalled housing delivery. |
| City Hall investment in the Silvertown Partnership | £100m supporting 7,000 homes | The GLA became an active development partner rather than only a planning authority or grant funder. |
| Central London office starts reported by Deloitte | 4.8m sq ft, down 35% year on year | The office market was selective rather than booming across the board. |
| Refurbishment share of office start volume | 66% | Retrofit, cut-and-carve construction and asset repositioning became the dominant source of new central London office work. |
| Skanska contract for 55 Old Broad Street | £282m | Prime City offices with strong investment backing continued to reach main-contract award. |
| Construction insolvencies in England and Wales | 3,803 in the 12 months to May 2026 | Construction remained the industry with the highest number of insolvencies, sustaining payment and supply-chain risk. |
Data warning: these figures describe different reporting periods and should not be combined into one market-value total. Deloitte’s April 2026 survey covers office starts during 2025, while BSR figures are rolling 12-week data to 30 May 2026. The £324 million and £100 million figures are public investment commitments, not the total construction value of every scheme they may support.
The Defining Story Was Market Separation, Not Simple Growth
London entered 2026 with a large visible pipeline, but planning approval, development value and construction commencement increasingly meant different things. The capital still contained multibillion-pound regeneration plans, major office towers, infrastructure programmes and thousands of consented homes. The difficulty was converting those opportunities into funded, regulator-ready and commercially deliverable work.
This distinction explains why apparently contradictory stories could all be true at the same time. Housing starts could remain historically weak while a contractor secured a contract reported at more than £300 million for a major residential phase. Office starts could decline by 35% while the City approved an 86,000 sq m office-led development and Skanska signed a £282 million contract. Contractor insolvencies could remain elevated while selected Tier 1 and integrated groups expanded their order books. London Construction Magazine’s earlier analysis of the London construction market in 2026 identified the same underlying shift: investment was not disappearing equally across the market. It was concentrating around assets with clearer demand, stronger funding, lower planning uncertainty or strategic public importance.
1. London’s Housing Crisis Became a Construction Delivery Crisis
The most consequential story of the first half was the deterioration of London housing delivery. The argument moved beyond whether enough land had been allocated or enough applications approved. The central problem was that developers were increasingly unable or unwilling to convert consented schemes into starts at the scale required. Berkeley Group gave the clearest industry warning in its full-year results on 24 June. The company said London was delivering less than 10% of its Ministry of Housing, Communities and Local Government annual new-homes target and saw no prospect of material improvement without more decisive intervention. It also said the time needed to deliver new apartment buildings must be reduced from eight years to the five years typical a decade earlier.
That eight-year period includes far more than construction. Land acquisition, planning, Section 106 negotiation, statutory consultation, detailed design, pre-commencement conditions, Gateway 2 approval, procurement and physical delivery all sit inside the development programme. The commercial consequence is that capital remains committed for longer while policy, demand, taxation and build costs can change before completion. The final position of the Affordable Homes Programme 2021–26 reinforced the problem. By the March 2026 start deadline, 14,335 homes had begun against a revised target of between 17,800 and 19,000. That target had already been reduced from earlier programme ambitions. Thousands of homes remained in the pipeline, but the missed start target showed how funding availability alone did not overcome land, procurement, planning, viability and delivery constraints.
The government and Mayor responded on 25 March with a package of time-limited emergency measures. The final package included proposed Community Infrastructure Levy relief for qualifying developments, changes to planning guidance, a new time-limited planning route and an initial £324 million allocation to the City Hall Developer Investment Fund. The package mattered because it acknowledged officially that London’s housebuilding slowdown was not a short-term statistical fluctuation. Government identified high interest rates, construction costs, planning and regulatory complexity, weak demand and poor site viability as factors stalling the capital’s pipeline. London Construction Magazine had already examined how these constraints were turning London housing approvals into uncertain construction programmes.
City Hall Moved From Supporter to Developer
The second major housing intervention came on 16 June, when the Mayor launched City Hall Developer through a £100 million investment in the Silvertown Partnership. The GLA became a 50% shareholder in the organisation responsible for redeveloping the Royal Docks site alongside Lendlease, supporting a planned 7,000-home scheme. The significance was institutional. City Hall was no longer acting only through policy, planning powers, land release and grant funding. It was taking a direct development position in a complex regeneration project. Silvertown was described as the first in a wider pipeline of sites intended to be unlocked through the model.
The housing story of H1 2026 was not merely that output was low. It was that conventional private delivery had weakened enough to produce emergency planning measures, a £324 million intervention fund and a new City Hall development model within the same six-month period.
2. The Building Safety Regulator Became Part of the Critical Path
The Building Safety Regulator remained one of the most important influences on London construction programmes. The first half of 2026 did, however, produce evidence of improved decision-making capacity. In the 12 weeks to 30 May, the regulator made 358 Gateway 2 decisions across all application categories, with an overall approval rate of 75%. London accounted for 65% of those decisions. Applications representing 14,928 residential units were determined, including 9,499 units within approved applications, while 38,775 units remained represented by live cases.
The regulator’s Innovation Unit made 31 decisions in the same period, approving 28. All 19 London decisions handled through the unit were approved. External-remediation approval rates rose to 79%, while the number of outstanding legacy 2024 remediation applications fell from 42 at the start of the year to 16. Those figures show operational improvement, but they do not mean the regulatory programme risk disappeared. The reported median approval time for Innovation Unit approvals was 22 weeks. Average remediation approval time remained distorted by older cases. London still had 894 live applications across all categories at the end of the reporting period.
The commercial lesson was that Gateway 2 could no longer be treated as a late compliance checkpoint. Fire strategy, structural design, change control, competence evidence and the coordination of specialist design information needed to be developed earlier. Weak or incomplete submissions did not simply create an administrative delay; they affected mobilisation, finance, procurement and contractor resource planning. This was the shift explored in London Construction Magazine’s analysis of why building safety regulation had become a primary programme risk for London residential delivery.
3. Ardmore Showed How Historic Safety Liabilities Can Reach the Present
The Ardmore story connected building safety law, contractor solvency and live-project disruption more clearly than any other corporate event in the first half of the year. On 1 April, the Technology and Construction Court handed down judgment in Crest Nicholson Regeneration Ltd and others v Ardmore Construction Ltd and others. The court confirmed that Building Liability Orders could be made on an anticipatory basis before final liability was established and that an adjudicator’s decision could amount to a relevant liability under section 130 of the Building Safety Act 2022.
The dispute concerned fire-safety defects at the Admiralty Quarter residential development in Portsmouth. Crest Nicholson had obtained an adjudication decision worth approximately £14.9 million against Ardmore Construction Ltd, which had entered administration before the adjudicator’s decision was issued. The court extended liability to associated entities where it considered that outcome just and equitable. On 11 June, Ardmore Construction Group Ltd entered administration. The corporate and legal sequence should not be reduced to a claim that one judgment alone caused the failure, but the timing demonstrated the wider risk now attached to historic defects, group structures and contingent building-safety liabilities.
For clients and the supply chain, the consequences were immediate. Hammersmith and Fulham Council moved to terminate Ardmore’s main works contract for its Civic Campus following insolvency. Other live London projects required assessment, security, replacement procurement or revised completion strategies. The wider insolvency environment made the event more significant. Construction recorded 3,803 company insolvencies in England and Wales in the 12 months to May 2026, representing 17% of cases where industry was captured. The number had fallen compared with the previous year, but construction still recorded more failures than any other sector.
Ardmore’s importance was larger than one contractor. The case showed that historic defects can survive insolvency, cross corporate boundaries and affect current operating companies. For contractor groups, developers, funders and insurers, building-safety exposure had become a balance-sheet and corporate-structure issue.
4. HS2 Finally Began Tunnelling Towards Euston
After years of uncertainty around the London terminus, HS2 reached a major physical milestone on 27 January when the first tunnel boring machine began the 4.5-mile journey from Old Oak Common towards Euston. The second machine launched on 16 March. The Euston Tunnel is the final deep twin-bore tunnel on the HS2 route between London and Birmingham. Its start did not resolve every question surrounding Euston station, programme cost or the wider HS2 reset. It did, however, convert a politically contested commitment into live underground construction.
For London’s construction market, the importance extended beyond the tunnel drives. Old Oak Common and Euston connect rail engineering to station construction, utilities, logistics, property development and long-term regeneration. The tunnelling milestone supported confidence that central London remained part of the operational railway rather than becoming a permanently deferred future phase. It also provided continuity for specialist tunnelling, temporary works, instrumentation, sprayed-concrete, logistics and engineering supply chains. Both machines are scheduled to reach the Euston approaches in 2027, meaning the work created a multiyear construction sequence rather than a one-off announcement.
5. The Office Market Shifted Toward Retrofit and a Smaller Group of Prime Schemes
The office market produced some of the most apparently contradictory headlines of the half-year. Deloitte’s April London Office Crane Survey reported that new starts had fallen 35% year on year to approximately 4.8 million sq ft. New-build volume more than halved to 1.6 million sq ft. Yet developers also reported stronger confidence in leasing demand for high-quality space and warned of a potential supply gap later in the decade. The explanation was the continued flight to quality and the dominance of refurbishment. Retrofit schemes represented 3.1 million sq ft and 66% of all new-start volume. Refurbishment had now exceeded new development throughout the post-Covid period.
This was not simply an environmental trend. Retaining and upgrading existing structures can reduce embodied carbon, shorten programme periods and avoid some of the cost and planning exposure attached to complete redevelopment. It also creates technically demanding work involving structural investigation, strengthening, façade retention, MEP replacement, fire upgrades, vertical extensions and occupied-neighbour constraints.
1 Silk Street and 55 Old Broad Street Showed What Still Attracted Capital
On 28 May, the City of London Corporation approved the redevelopment of 1 Silk Street beside the Barbican. The part 16 and part 20-storey scheme will provide approximately 86,000 sq m of Grade A office space with cultural, retail, community and public-realm uses. A substantial proportion of the existing structure is intended to be retained.
One month later, Skanska announced a £282 million contract with AshbyCapital to deliver 55 Old Broad Street. The 23-storey project will provide around 270,000 sq ft of office accommodation, alongside retail and public realm. Skanska’s scope also includes MEP systems, Cat A fit-out, the refurbishment of the Grade II-listed Bishopsgate Victorian Bath House and work to 65 Old Broad Street.
Construction is due to begin in October 2026 and complete in late 2029. The scheme targets BREEAM Outstanding and a five-star NABERS rating. Its significance was not proof of a general office boom. It was evidence that well-located, sustainability-led projects with committed capital and strong development teams could still reach contract award despite weaker overall start volumes.
6. Large Residential Work Did Not Disappear—It Became More Selective
The housing crisis did not mean every major residential project stopped. Instead, the schemes that moved tended to have committed capital, a clear delivery structure, public or institutional backing, or the ability to manage more of the supply chain directly.
In April, JRL Group secured the design-and-build contract for Thames City Phase 2 at Nine Elms. The next phase is planned to deliver 608 homes across five mansion-block buildings between 12 and 22 storeys. The contract was reported to be worth more than £300 million, although that figure was not confirmed publicly by the client. JRL said approximately 80% of the construction value would be delivered through its own specialist divisions, including reinforced-concrete frame, façades, MEP, bathroom pods and dry lining. That integrated model reduced the number of interfaces held by the client and gave the contractor greater control over quality, logistics and programme.
The award was important because it showed the type of housing project still capable of moving in a difficult market: large-scale, phased, backed by an established development structure and assigned to a contractor able to self-deliver major work packages. It should not be treated as evidence that the wider private-housing market had recovered.
7. East London Became a Test Bed for Skills and Circular Construction
Two announcements in the Royal Docks and Barking Riverside showed that construction capacity itself was becoming an investment priority.
On 2 March, the UK’s first dedicated Circular Construction Hub launched in the Royal Docks. Hosted on GLA land and delivered with Tipping Point East and Newham Council, the hub is intended to recover, refurbish and reuse construction materials that would otherwise become waste. It is the first phase of a proposed Circular Economy Village in Silvertown. The hub is expected to divert at least 950 tonnes of material from landfill over five years. Its location beside major development pipelines matters: circular construction becomes commercially useful only when recovery, storage, testing, certification and reuse can connect to live projects at scale.
On 27 May, construction began on the NHBC multi-skill training hub at Barking Riverside. The facility forms part of NHBC’s £100 million national investment in 12 hubs and is designed to train 200 apprentices each year in bricklaying, groundworks, site carpentry and timber-frame erection. The wider network is intended to train up to 3,000 apprentices annually. The project responded directly to a forecast requirement for an additional 239,300 UK construction workers by 2029. Barking Riverside was selected because of its long-term housing pipeline, allowing trainees to learn against real site demand rather than in isolation from employers.
Together, the circular hub and training centre reflected a broader lesson. London cannot deliver housing, retrofit, infrastructure and building-safety remediation solely by changing planning policy. It also requires physical capacity: skilled trades, specialist supervisors, testing capability, material-reuse systems and employers prepared to support apprentices through to site employment.
What the First Half of 2026 Revealed About London Construction
| Defining Theme | Evidence from H1 2026 | Practical Meaning |
|---|---|---|
| Housing viability | Berkeley’s warning, the affordable-housing start shortfall and emergency government intervention. | Planning consent alone no longer provides reliable evidence of near-term construction activity. |
| Regulatory readiness | Improved Gateway 2 approval rates but a continuing large live caseload. | Design evidence, competence and change control must be planned before procurement and mobilisation. |
| Historic liability | The Crest Nicholson v Ardmore Building Liability Order judgment and later group administration. | Old defects can affect present corporate structures, insurance positions, credit and project continuity. |
| Prime versus marginal assets | Falling overall office starts alongside 1 Silk Street and the £282m 55 Old Broad Street award. | Capital is concentrating in best-in-class assets rather than lifting the whole market. |
| Public-sector intervention | £324m City Hall Developer fund and £100m Silvertown investment. | More projects may depend on public capital, land or direct development participation. |
| Construction capacity | NHBC training hub and Royal Docks circular-material infrastructure. | Delivery depends on workforce and supply-chain systems, not only policy and funding. |
What These Stories Mean for the Second Half of 2026
The second half of the year will test whether the first-half interventions produce actual starts. Expressions of interest and project selection under the City Hall Developer Investment Fund must translate into land transactions, appointments and construction programmes. The Silvertown investment must progress from governance and capital commitment into phased delivery.
The Building Safety Regulator will be judged not only by approval percentages but by the time taken to determine current applications and the quality of projects entering Gateway 3. Contractors and developers will continue adapting procurement so that design responsibility, evidence production and specialist coordination are resolved earlier.
Ardmore’s administration is likely to intensify due diligence across the market. Clients will examine historic defect exposure, group-company structures, insurance, cash, bonds, warranties and the ability of contractors to support remediation claims while delivering live projects.
The office market will remain selective. Projects already backed by capital and occupier demand may advance, but the 35% reduction in start volume points to a thinner future pipeline. Retrofit should continue to provide structural, façade, MEP, fire-safety and fit-out workloads even where complete redevelopment remains difficult.
HS2 tunnelling will continue beneath west and north-west London, while Old Oak Common and Euston remain critical indicators of whether infrastructure construction can unlock wider regeneration. In housing, the key measure will be starts rather than announcements, consents or theoretical development value.
Evidence-Based Summary
London construction became more selective during the first half of 2026 rather than experiencing a uniform boom or collapse.
Housing delivery remained the deepest structural weakness, prompting emergency planning measures, a £324 million fund and direct City Hall investment in Silvertown.
Gateway 2 throughput improved, but regulatory evidence and approval timing remained central to residential programme certainty.
The Ardmore litigation and administration showed how historic building-safety liabilities can affect associated companies and live construction projects.
HS2 tunnelling towards Euston provided one of the clearest physical infrastructure milestones of the half-year.
Central London office starts fell, but refurbishment dominated activity and selected premium schemes still reached approval and main-contract award.
Skills investment and circular-material infrastructure in east London showed that future delivery depends on construction capacity as much as policy ambition.
FAQ: London Construction in the First Half of 2026
Was London construction booming in the first half of 2026?
Not across every sector. Major infrastructure, selected offices, retrofit and well-backed regeneration projects moved forward, while housing starts, viability and contractor insolvency remained serious weaknesses.
What was the biggest problem facing London housebuilding?
The central problem was converting sites and planning permissions into financially viable construction starts. Finance costs, taxation, regulation, planning obligations, buyer demand and long development programmes all affected delivery.
Did Building Safety Regulator performance improve?
Yes. The regulator reported 358 Gateway 2 decisions and a 75% approval rate in the 12 weeks to 30 May 2026. London represented 65% of decisions. However, approval periods and a large live caseload remained important programme risks.
Why was the Ardmore case important?
The court confirmed that Building Liability Orders can extend relevant building-safety liabilities to associated companies and may be made before final liability is established. Ardmore Construction Group’s later administration showed the commercial significance of that legal environment.
Did HS2 construction reach central London?
Tunnelling from Old Oak Common towards Euston began in January 2026, with the second tunnel boring machine launching in March. The machines are expected to reach the Euston approaches in 2027.
Is London’s office construction market recovering?
The market remains selective. Deloitte reported a 35% annual fall in new-start volume, but refurbishment accounted for 66% of starts and premium office schemes continued to secure approvals and contracts.
What types of construction work appear strongest?
Infrastructure, complex refurbishment, premium offices, building-safety work, selected large regeneration projects and publicly supported housing currently offer the clearest areas of sustained demand.
What should contractors watch in the second half of 2026?
Contractors should monitor actual housing starts under the emergency package, BSR determination times, replacement procurement following insolvencies, City office awards, HS2 progress and the conversion of public investment announcements into tendered construction packages.
Authoritative Source Context
Building-safety figures are drawn from the Building Safety Regulator’s May 2026 Gateway 2 update. Housing-policy evidence is drawn from the Ministry of Housing, Communities and Local Government’s Support for Housebuilding in London package, the Greater London Authority’s Silvertown investment announcement and London Assembly monitoring of affordable-housing delivery. Berkeley’s market assessment is drawn from its full-year 2026 results.
The Building Liability Order analysis is based on Crest Nicholson Regeneration Ltd and others v Ardmore Construction Ltd and others [2026] EWHC 789 (TCC). Administration dates are confirmed through Companies House and affected-project information through public-client reports. Insolvency statistics are drawn from the Insolvency Service’s May 2026 company-insolvency commentary.
Infrastructure information is drawn from HS2’s Euston tunnelling announcement. Office-market figures are drawn from Deloitte’s April 2026 London Office Crane Survey. Project evidence is drawn from the City of London Corporation’s 1 Silk Street decision, Skanska’s 55 Old Broad Street contract announcement and industry reporting on Thames City Phase 2.
Skills and circular-construction evidence is drawn from the Royal Docks’ Circular Construction Hub announcement and NHBC’s Barking Riverside training-hub announcement.
Source Context and Editorial Note
This article is an independent London Construction Magazine assessment of publicly available information as at 15 July 2026. It distinguishes reported contract values from confirmed project values, planning approval from construction commencement, programme funding from construction expenditure and political announcements from live delivery. Some events occurred during the first half of 2026 while final programme figures were published shortly afterwards. Where a value was reported but not confirmed by the client, it is identified as reported rather than treated as an official contract sum.
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Expert Verification & Authorship: Mihai Chelmus
Founder, London Construction Magazine | Construction Testing & Investigation Specialist |
