London construction entered the final month of Q3 2026 with a two-speed market. From 1 July to 10 September, major planning decisions, contractor appointments and selected site starts continued across the capital, but physical residential delivery remained weaker than the headline pipeline suggests. Mace began work on the former City Hall redevelopment in July; Multiplex was appointed at 50 Baker Street and 99 City Road; Kier secured the £98.95m Holden House scheme; Sisk broke ground on Prospect Place South at Battersea Power Station; and Glencar began piling for Pure DC’s 70MW LON01B2 facility at Brent Cross.
At the same time, the August UK Construction PMI fell to 44.3, with residential activity at 37.6. London’s Q3 story is therefore not a broad recovery. It is a selective market in which office retrofit, digital infrastructure, major regeneration and public-sector work are progressing faster than private housebuilding, while planning, funding, procurement and physical construction remain very different stages.
Research cut-off: 10 September 2026. Q3 runs until 30 September. London Construction Magazine has therefore treated events after 10 September as future milestones, not completed Q3 activity. The project-stage analysis below also keeps development values, funding, framework ceilings and construction contracts separate rather than combining them into a misleading headline total.
Construction works at 171 Victoria Street, Westminster, on 10 September 2026. Sisk is delivering the refurbishment and extension of the former John Lewis headquarters. Original Photo: London Construction Magazine.
London construction Q3 2026: what has actually moved
The clearest way to read London’s quarter is not by counting announcements, it is by asking what changed at project level. A planning decision creates pipeline, a main-contractor appointment moves procurement and piling proves physical construction. Completion is another stage again.
| Project / event | Q3 movement | Status at 10 September | Scale / value |
|---|---|---|---|
| Former City Hall, More London | Mace appointed and works commenced in July | Under construction / redevelopment | 18,000 sq m expanding to 22,000 sq m |
| 50 Baker Street | Multiplex appointed main contractor on 29 July | Main contractor appointed; main works due 2027 | 236,000 sq ft; 17 homes plus office, retail and restaurants |
| Crystal Palace National Sports Centre | Planning approval confirmed in July | Approved; Morgan Sindall already appointed | 15-hectare refurbishment programme |
| 99 City Road | Multiplex formally appointed main contractor on 10 August | Main contract following earlier PCSA; Q3 start stated by contractor | 36 storeys; 475,000 sq ft |
| Holden House, W1 | Kier appointed on 11 August; works commencing | Main construction / redevelopment | £98.95m; around 135,000 sq ft |
| 171 Victoria Street | Sisk appointed; site works under way | Retrofit and extension in construction | More than 200,000 sq ft |
| Old Oak Common station | Six high-speed platforms completed in August | Station construction continuing | Six underground platforms, each 450m long |
| Pure DC LON01, Brent Cross | Glencar commenced piling on 3 September | Physical construction / structural phase | 70MW B2 facility; 90MW campus; £1bn+ wider campus investment |
| Beckton Riverside Phase 1 | Mayoral planning determination in September | Outline approval plus detailed remediation/preparation permission | 2,977 homes in Phase 1 |
| Vauxhall Square | Lambeth committee resolved to grant permission | Planning stage; legal agreement and Mayoral process remain | Up to seven buildings, maximum 69 storeys; 1,097 homes plus co-living and PBSA |
| Prospect Place South, Battersea | Sisk and BPSDC broke ground on 9 September | Construction started | Around 300 homes; 65,000 sq ft commercial space |
| Thavies Inn House, Holborn Circus | McLaughlin & Harvey appointed | £70m main contract; demolition is a separate package | Around 90,000 sq ft office space |
The table is a project-stage tracker rather than an attempt to manufacture a single Q3 investment number. The £98.95m Holden House construction contract cannot sensibly be added to Pure DC’s £1bn-plus campus investment, a London-wide funding programme or the reported development value of a planning scheme. They measure different things.
July put planning, retrofit and procurement into motion
The quarter opened with a major policy reset. The Mayor published the Draft London Plan on 16 July 2026. The draft sets out capacity for 558,000 homes over the ten-year period to 2037. It remains a draft: statutory consultation continues until 15 October 2026, with examination and adoption still to follow. That distinction matters. The 558,000 figure is a planning target and spatial strategy, not a committed construction programme. LCM’s earlier London Construction Market Signals analysis for July 2026 found the same split that remains visible in September: substantial forward pipeline, but uneven conversion into actual starts.
Physical work did move on selected commercial schemes. Mace Construct was appointed by St Martin’s Property Group to redevelop the former London City Hall at 110 Queen’s Walk, with the contractor confirming that works would commence in July. The project increases the building from 18,000 sq m to 22,000 sq m and includes replacement cladding and glazing, terraces, roof works, atrium infill, shell-and-core construction, new MEP systems and public-realm improvements.
That project is particularly useful when reading the quarter because it is not a straightforward new-build office scheme. As LCM reported when Mace's former City Hall scheme moved forward, it is a substantial cut-and-carve redevelopment where retention and new construction have to work together. Q3 has produced several variations of that model.
On 29 July, Multiplex confirmed its appointment as main contractor for Derwent London’s 50 Baker Street. The AHMM-designed scheme will provide 236,000 sq ft across offices, retail, restaurants, community space and 17 apartments. Multiplex had already spent a year working on the project under a PCSA. Main works are scheduled for 2027, so the July event was a main-contractor appointment, not a construction start. Published estimates have attached different values to 50 Baker Street, but Multiplex’s own appointment announcement does not state the main-contract sum. LCM has therefore not treated a secondary estimate as an official contract value.
Public-sector pipeline also moved. Bromley approved the redevelopment of Crystal Palace National Sports Centre in July. Morgan Sindall Construction had already been appointed to the 15-hectare project, with major works expected later in 2026. The programme includes the Grade II*-listed sports centre, aquatics facilities, indoor and outdoor sports areas and energy upgrades.
City Hall also announced an £88.6m construction-skills package on 27 July, intended to support more than 20,000 courses and industry placements. The same announcement cited a CITB estimate that Greater London needs around 26,500 additional construction workers over five years. Again, this is skills funding, not construction-contract value, but it describes the labour requirement sitting behind the pipeline.
August strengthened the prime office and retrofit workload
August produced some of the quarter’s clearest main-contractor appointments. On 10 August, Endurance Land formally appointed Multiplex at 99 City Road, following the contractor’s earlier PCSA involvement. The 36-storey scheme will provide 475,000 sq ft of commercial space at the Old Street and City interface.
Multiplex stated that construction would commence in Q3 2026 and practical completion is targeted for 2030. The appointment is verified. LCM has not, however, converted that programme statement into an independently verified site start. That difference between an announced start window and observable physical construction is central to reading the quarter accurately.
One day later, Kier confirmed a £98.95m appointment at Holden House for Derwent London. The behind-the-façade redevelopment at Oxford Street and Rathbone Place will create around 135,000 sq ft across eight storeys, including approximately 115,000 sq ft of offices and 20,000 sq ft of retail. Kier said works were commencing, with superstructure activity due from spring 2027 and completion targeted in 2028.
Sisk’s 171 Victoria Street project adds another form of reuse. Sisk was appointed to refurbish and extend the former John Lewis headquarters for Kirkglade Ltd, creating more than 200,000 sq ft of Grade A workspace. TP Bennett designed the Westminster scheme, with Savills and Core Five managing the project. The works retain or reuse steelwork, concrete and hundreds of existing stainless-steel window frames, while adding a new façade and low-carbon concrete. Sisk’s project team has confirmed that ground has been broken, with completion due at the end of Q4 2027.
Taken together with 50 Baker Street and former City Hall, the pattern is difficult to miss. London commercial construction is active, but much of the strongest verified Q3 workload is tied to existing buildings, retained façades, structural alteration and premium central locations rather than a broad wave of speculative new-build offices. The new-build 99 City Road tower is the important counter-example.
That distinction also fits the wider London office pipeline tracked by LCM for 2027–2030, where major new-build towers and large retrofit schemes are progressing on different programmes and through different procurement routes.
Old Oak Common gives Q3 a major infrastructure milestone
Transport infrastructure supplied one of August’s clearest physical-delivery milestones. HS2 confirmed on 13 August that all six high-speed platforms at Old Oak Common had been constructed. Each underground platform is 450 metres long and now awaits further fit-out as work continues on the west London superhub.
Balfour Beatty Vinci SYSTRA is the station construction partner, with Expanded delivering the platform structures. That is a useful counterweight to the weaker residential picture: large infrastructure schemes continue to create long-duration civils, structural, rail systems and fit-out workload even when private building markets are subdued.
LCM’s Q3 research also identified TfL’s Infrastructure Improvement Framework as an important forward route to work, with an estimated £500m–£700m range of projects. That figure describes the anticipated framework pipeline. It is not £700m of contracts already awarded and does not guarantee the level of eventual call-off spend.
Brent Cross proves London data centres are now site workload
The strongest digital-infrastructure event in the quarter arrived in September. Pure DC confirmed on 3 September that Glencar had started piling for the West Cold Shell of its 70MW LON01B2 facility at Brent Cross.
The work adds more than 23,000 sq m to the campus and will take total capacity to 90MW. Pure DC describes LON01 as a development involving more than £1bn of investment, but that figure applies to the wider campus and must not be presented as Glencar’s construction-contract value.
The construction scope is more useful than the headline investment number. Glencar is delivering piling and foundations, underground services, the structural frame, connections to the adjacent East Cold Shell, concrete and slab works, stair cores, envelope and roofing. The B2 facility is scheduled for completion in Q2 2029.
As LCM reported from the Brent Cross construction programme, this is evidence that London’s data-centre pipeline has moved beyond planning, power discussions and investment announcements into identifiable groundworks and structural packages. For contractors and specialist suppliers, that means real demand for foundations, frame, envelope, HV/MV, mechanical systems, cooling, controls and commissioning.
September brought a rare mix of starts and giant planning decisions
Battersea Power Station supplied one of the cleanest construction-start events of Q3. On 9 September, Battersea Power Station Development Company and Sisk broke ground on Prospect Place South. Gehry Partners designed the two-building phase, which will provide around 300 homes, 65,000 sq ft of commercial space, a 15,000 sq ft community hub and a cycle hub.
This one can be called a construction start because physical commencement has been confirmed. That sounds obvious, but it separates Battersea from several of September’s much larger planning headlines.
At Beckton Riverside, Deputy Mayor for Planning Jules Pipe determined the called-in Phase 1 applications following the September representation hearing. The scheme covers 2,977 homes in its first phase. The planning position includes outline consent for the wider Phase 1 development and detailed permission for remediation and site-preparation works. The City Hall Beckton Riverside record shows that the applications had previously been resolved for approval by Newham before the Mayor called them in during April.
The important construction distinction is that 2,977 consented homes are not 2,977 homes under construction. Beckton now has a route into remediation and preparation work, while subsequent physical delivery still depends on detailed design, infrastructure, procurement and later project stages.
Vauxhall Square is an even larger example of pipeline being mistaken for delivery if the project stage is stripped away. Lambeth’s application covers seven buildings ranging from three to 69 storeys, 1,097 conventional homes, 1,164 co-living units and 699 student bedrooms, as well as hotel, office, retail, cinema and community uses. Lambeth’s Vauxhall Square planning record confirms that scope.
The planning committee resolved in September to grant the scheme, but the legal agreement and Mayoral referral process remain part of the planning sequence. A main contractor has not been publicly confirmed and construction has not started. LCM previously examined the project when officers recommended approval of the 69-storey Vauxhall Square scheme.
The City office market produced a more immediate procurement event at Thavies Inn House, Holborn Circus, where McLaughlin & Harvey has been appointed on a reported £70m main contract for Evans Randall Investors. Erith’s demolition works are a separate package. Main construction is expected in Q4 2026, so neither the demolition nor the contractor appointment should be rewritten as a Q3 main-works start.
Housing remains Q3's clearest gap between ambition and delivery
The biggest Q3 planning numbers are residential, but the wider evidence remains weak at the point where permissions need to become starts. The London Assembly Affordable Housing Monitor 2026, published on 8 July, records 14,335 starts under the Affordable Homes Programme 2021–26 by March 2026 against a revised target of 17,800–19,000. It also records 32,081 homes from the earlier 2016–23 programme that had started but were still awaiting completion by March 2026.
Those figures pre-date Q3 physically, but their publication during the quarter provides an important baseline for interpreting the new planning pipeline. London does not currently lack housing proposals. It lacks consistent conversion through viability, funding, regulation, procurement and construction into finished homes. The Draft London Plan’s 558,000-home ten-year capacity, Beckton Riverside, Vauxhall Square and other Q3 approvals therefore belong on one side of the ledger. Physical starts belong on the other. Combining the two would conceal the most useful finding of the quarter.
New affordable-housing funding may improve the forward pipeline, but funding allocations must also remain separate from contract awards. LCM has examined that distinction in its analysis of London's new affordable-housing funding and the money still to be allocated.
The UK downturn makes London's selective activity more important
The national backdrop deteriorated as Q3 progressed. The S&P Global UK Construction PMI recorded 44.7 in July and 44.3 in August. A reading below 50 represents contraction in the survey, and August was the twentieth consecutive sub-50 month. Housing was the weakest August component at 37.6. Commercial activity registered 47.8 and civil engineering 40.5. These are UK-wide indicators, not London-specific output measures, so they should not be used to claim that London's own market contracted at precisely the same rate.
They do, however, make the project evidence more revealing. Q3 has not produced a simple London-versus-UK split in which the capital is booming while the rest of the country contracts. Instead, strong London schemes are getting through selectively: premium offices, complex retrofit, data centres, transport infrastructure and established regeneration projects with defined clients and delivery teams.
Contractor risk remains part of the project pipeline
The quarter has also shown why a project cannot be understood only from its planning permission or headline value. Ardmore Construction Group entered administration before Q3, in June, but the consequences continued into the quarter as restructuring arrangements progressed and the group moved away from main contracting. That matters because contractor distress changes live-project sequencing. Clients may need replacement contractors, fresh surveys, revised packages, new warranties, additional pre-construction work and updated programmes before a stalled project genuinely restarts.
Green Man Lane in Ealing provided a September example of a long-running regeneration scheme moving towards renewed delivery. Higgins Partnerships has been brought into the arrangements for the remaining homes after earlier disruption to the programme. The available Q3 evidence supports a contractor/development restart process, not a claim that the remaining main construction works have already commenced. This is another recurring Q3 pattern: the gap between project alive and project physically building can contain months of procurement, regulatory, design and commercial work.
What Q3 2026 is actually telling London construction
Planning is moving faster than starts. Large residential permissions and policy changes continue to increase London's future pipeline, but the verified sample of physical starts is much smaller. Beckton Riverside and Vauxhall Square illustrate the difference particularly clearly.
Retrofit is now a core commercial workload. Former City Hall, Holden House, 171 Victoria Street and 50 Baker Street each involve substantial work to existing urban fabric. Structural alterations, retained elements, façade interfaces, MEP replacement and low-carbon upgrades are not side markets in central London; they sit inside some of the capital's most important commercial projects.
New-build offices have not disappeared. Multiplex’s appointment at 99 City Road shows that large new commercial towers can still progress. The evidence does not support calling this a general speculative-office recovery, however. Project quality, location, occupier demand, funding and procurement remain decisive.
Data centres have crossed into identifiable construction workload. Brent Cross is the strongest Q3 example because the evidence is no longer a land deal, planning application or capacity forecast. Piles are going into the ground and a defined cold-shell construction package is under way.
Infrastructure continues to provide long-duration work. The six constructed HS2 platforms at Old Oak Common, TfL's forward programmes and major public schemes provide different forms of workload from residential and commercial development, reducing London's dependence on any single building sector.
Contractor appointments do not automatically produce cranes. 50 Baker Street has a main contractor but main works are scheduled for 2027. 99 City Road has a contractor and an announced Q3 construction window, but the appointment itself is not proof of mobilisation. Thavies Inn House has a main contractor while a separate demolition package precedes Q4 main works. Project-stage accuracy materially changes the picture.
The most defensible description of London in Q3 is selective improvement, not recovery. Strong schemes are advancing and contractors are winning substantial work, but the national residential downturn, London's affordable-housing delivery gap and continuing contractor risk prevent the evidence from supporting a broader claim.
What still has to happen before Q3 closes
Twenty days of the quarter remain after this research cut-off, so the final Q3 record may still change. Battersea Power Station has 16 acres of the wider neighbourhood left to deliver and a revised masterplan application has been indicated for September. Until that application is filed, it remains a scheduled next step rather than a completed planning event. At Vauxhall Square, the next planning steps remain the legal agreement and Mayoral process. At Beckton Riverside, attention moves from the planning decision towards remediation, site preparation and the later detailed delivery sequence. At 99 City Road, the next evidence LCM will look for is physical mobilisation consistent with the Q3 construction programme announced by Multiplex.
The Draft London Plan will remain in statutory consultation beyond the end of Q3, closing at 5pm on 15 October 2026. Its 558,000-home capacity should therefore continue to be treated as proposed planning policy rather than delivered housing. London Construction Magazine will treat 30 September as the quarter-end boundary. Until then, the evidence points to a capital where planning and procurement remain substantially larger than the pool of verified new starts, while retrofit, data centres, infrastructure and a small group of major regeneration schemes are producing some of the clearest physical workload. The next test is which September pipeline events cross into contract award, remediation or site activity before Q3 closes.
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Expert Verification & Authorship: Mihai Chelmus Founder & Editor, London Construction Magazine | Construction Testing & Investigation Specialist |