The 28 October 2026 Budget will become the first decisive financial test of the government’s promise to move power and money out of Westminster and give English mayors a greater share of locally generated tax revenue.
Chancellor John Healey has confirmed that the Budget and a new Office for Budget Responsibility economic and fiscal forecast will be published together on Wednesday 28 October. For construction, the date matters because the government has said its fiscal-devolution roadmap will set out further details on business-rate retention and income-tax revenue for mayoral strategic authorities.
London Construction Magazine’s earlier analysis, Income Tax for English Mayors: What It Could Mean for Housing, Retrofit and Infrastructure, examined the opportunity and the unresolved design questions. The latest Treasury announcement now creates a fixed decision point. The Budget must show whether regional leaders will gain usable, multiyear investment capacity or simply receive a different route to broadly the same funding.
LCM assessment: The 28 October Budget should not be judged by the size of an announced tax share alone. The construction test is whether mayors receive predictable net resources, protection against revenue volatility, workable borrowing and capital rules, and enough delivery capacity to convert regional plans into funded projects. Fiscal devolution could improve the operating system behind housing and infrastructure, but the government has confirmed that it will begin on a fiscally neutral basis rather than as an automatic construction spending increase.
Jump to: Budget checkpoint | What the date changes | Fiscal neutrality | Grant replacement | Borrowing and capital | From revenue to projects | What it means for London | The OBR test | Industry representations | What businesses should do | What to watch on Budget day | LCM verdict | FAQ
The 28 October Construction Funding Checkpoint
| Budget Test | What Is Confirmed | What Remains Unresolved | Construction Consequence |
|---|---|---|---|
| Budget and OBR forecast | Both will be published on 28 October 2026. | The revised growth, borrowing, debt, inflation and fiscal-rule position. | The forecast will help determine how much room exists for new commitments or protection of existing capital programmes. |
| Business-rate retention | Mayors are due to begin retaining a greater share of locally generated revenue from spring 2027, starting with business rates. | The percentage, baseline, reset rules, safety net and interaction with existing local-government finance. | The design could support longer regional programmes or leave authorities exposed to volatile commercial-property receipts. |
| Income-tax assignment | The roadmap will consider giving mayors control over the allocation of a share of existing income-tax revenue. | The assigned share, implementation timetable, calculation method and treatment of economic growth. | A stable revenue stream may improve investment planning, but it does not by itself authorise capital spending or infrastructure borrowing. |
| Grant replacement | The reform will begin on a fiscally neutral basis, with grant funding reduced where areas receive assigned tax revenue. | Which grants are replaced, the transition baseline and whether any authority has a net gain or loss. | A larger tax allocation can coexist with unchanged or lower total spending power if grants fall at the same time. |
| Equalisation and gain share | Government says equalisation will be built in where necessary and regions should retain an incentive to generate growth. | The needs formula, funding floors, growth-retention period and protection against economic shocks. | The formula will influence whether stronger tax bases gain disproportionately and whether high-need areas can maintain regeneration pipelines. |
| Borrowing and capital flexibility | Mayoral authorities already receive varying levels of flexibility through integrated settlements and existing powers. | Whether assigned revenue can support additional borrowing, capitalisation, guarantees or multiyear commitments. | This will determine whether predictable revenue can be converted into infrastructure delivered now rather than spent only as annual funding arrives. |
| London settlement | The Greater London Authority already operates within an integrated and bespoke funding structure. | How London’s tax base, existing business-rate arrangements, needs and national equalisation will be treated. | London could gain greater predictability without retaining all of the revenue nominally generated within the capital. |
Critical distinction: Fiscal devolution is not the same as a new construction fund. It changes who controls revenue and how regional growth may influence future resources. Housing, transport, retrofit and infrastructure will benefit only where the final rules create sufficient net capacity and mayors choose to direct that capacity into mature, deliverable programmes.
What the Confirmed Budget Date Actually Changes
The Chancellor’s announcement does not allocate money to a housing site, approve a transport scheme or create a regional infrastructure fund. Its significance is that it fixes the date on which the government must connect its devolution promises to the national fiscal framework. Until 28 October, the construction opportunity remains conditional.
The government has already established the direction. From next spring, mayors will begin retaining a greater share of locally generated revenues, starting with business rates. The Budget roadmap is expected to provide further detail on business-rate and income-tax retention. It is also expected to clarify how tax assignment will interact with central grants, equalisation, accountability and safeguards.
This makes 28 October a conversion test. London Construction Magazine’s analysis of Burnham’s construction plan found that regional control becomes valuable only when housing, transport, utilities, skills and regeneration are connected to real budgets and delivery organisations. The Budget should begin to show whether the Treasury is creating that financial operating model.
Fiscal Neutrality Means There Is No Automatic Construction Windfall
The most important limitation is now explicit. Government policy states that fiscal devolution will begin on a fiscally neutral basis. Where a region receives an assigned share of tax revenue, grant funding will be reduced accordingly. The initial reform is therefore a rebalancing of control, not an automatic increase in total public expenditure.
That does not make the reform irrelevant to construction. Predictability and flexibility have value even where the first-year total is unchanged. A mayoral authority that can plan against a durable revenue stream may be better placed to fund surveys, land assembly, design, enabling works, match funding and multiyear procurement than an authority dependent on short, competitive grants.
However, a change in funding architecture should not be presented as additional construction investment unless the net position supports that conclusion. If a mayor receives £1 of assigned revenue and loses £1 of grant, the immediate spending envelope has not increased. The potential gain lies in control, timing, flexibility and the ability to retain part of future growth. The Budget must quantify those features rather than rely on a large headline tax number.
Grant Replacement Will Decide the Real Regional Funding Position
The baseline calculation may be the least visible but most consequential part of the settlement. The Treasury must identify which grants are replaced, which remain protected and how the starting value is calculated. Without that comparison, neither mayors nor the construction market will be able to determine whether a region has gained financial capacity.
The government has said that no grant changes will be made without local consent. That creates an important negotiation stage, but it does not remove the commercial uncertainty. Contractors require clarity on whether existing investment funds, capacity funding or programme-specific grants will continue, be consolidated or disappear as tax retention grows.
A credible settlement should show the counterfactual: what each authority would have received under the existing grant system, what tax revenue it will receive under the new system, what protection applies if receipts fall and how much future growth it is allowed to retain. Construction pipelines should be based on that net figure, not the gross value of local tax receipts.
Revenue Assignment Matters Most If It Can Support Capital Investment
Income tax and business rates are revenue streams. Construction projects require capital, and major infrastructure often requires expenditure years before the economic and tax benefits become visible. The central technical question is therefore whether mayors will be permitted to use predictable assigned revenue to support borrowing, repay finance or make enforceable multiyear capital commitments.
Without an expanded or clarified borrowing framework, fiscal devolution may improve annual programme management without transforming the scale of infrastructure that can be delivered. With appropriate borrowing powers, revenue floors and affordability controls, it could help regional authorities invest earlier in transport, brownfield land, utility upgrades and other enabling works that unlock housing and commercial development.
The protection matters as much as the permission. Tax receipts can fall during a recession or after changes in employment and property markets. Long-term debt should not be supported by optimistic growth assumptions without reserves, safety nets and stress testing. A construction-positive Budget would therefore combine flexibility with transparent limits rather than offering either unrestricted borrowing or control in name only.
The Budget Must Connect Regional Revenue to Procurement-Ready Projects
Regional financial control will not create work automatically. A project still requires land, planning, design, utilities, statutory approvals, a costed business case, procurement capability and a client able to manage delivery. The strongest construction outcome would be a system in which multiyear revenue supports those early stages and allows local growth plans to develop into credible investment pipelines.
Housing is a clear example. A consented development may still depend on remediation, access, drainage, power, schools or transport. Flexible regional capital can address some of these interfaces, but only if the authority has identified the constraint, completed sufficient design and assigned responsibility for delivery. LCM’s earlier report on mayoral intervention in stalled housing and transport projects showed why political backing must be followed by infrastructure readiness and viable procurement.
For contractors, the signal is not the publication of a fiscal-devolution roadmap. It is the appearance of named sites, approved business cases, funding agreements, framework competitions, enabling packages and construction awards. The Budget can improve the conditions behind that sequence, but it cannot substitute for it.
What the Budget Could Mean for London Construction
London enters the reform from a different starting point from many English regions. The Greater London Authority is already one of seven mayoral strategic authorities covered by integrated settlements worth at least £13 billion collectively between 2026–27 and 2029–30. That national figure should not be treated as a dedicated London allocation, and funding appearing in more than one settlement document must not be counted twice.
The capital also has major programmes already in place. The London Social and Affordable Homes Programme provides up to £11.7 billion for 2026–36, while the City Hall Developer Investment Fund has an initial government allocation of up to £324.39 million to help unlock stalled private and affordable housing sites. These are relevant foundations, but they predate the October Budget and should not be relabelled as new Budget investment.
The opportunity is to make those existing programmes work more effectively alongside transport, utilities, regeneration and borough delivery. LCM’s review of the London Infrastructure Framework and the capital’s delivery coordination problem found that London’s risk is often fragmented sequencing rather than a lack of strategic ambition. More predictable devolved revenue could help fund early coordination and enabling infrastructure across organisational boundaries.
The risk is that London’s large income-tax and business-rate base creates an impressive gross allocation while equalisation and grant replacement reduce the net benefit. London has high land, labour and construction costs, extensive existing infrastructure, acute housing pressure and complex building-safety requirements. A settlement that appears generous per authority may still be inadequate relative to the cost and scale of delivery.
The Budget must therefore answer a precise London question: will the GLA obtain greater control over a stable funding base that can be committed to housing-enabling and infrastructure work, or will it receive a new tax label attached to resources already embedded in its settlement? The answer will depend on the baseline, equalisation formula, retained-growth rules, borrowing framework and treatment of London’s existing business-rate arrangements.
The OBR Forecast Will Set the Fiscal Boundary Around Construction Policy
The Budget will be published with a new OBR forecast, making the economic assessment central to the construction story. In March 2026, the OBR expected real GDP growth of 1.1% in 2026, public-sector net borrowing of £115.5 billion in 2026–27 and public-sector net debt of 94.8% of GDP. Those figures are a benchmark, not the October outcome.
Healey has promised that the Budget will meet the fiscal rules and retain a buffer against uncertainty, including instability in the Middle East. The OBR has already identified geopolitical conflict as a risk to energy markets, inflation and the fiscal position. For construction, any deterioration could affect public borrowing costs, material and energy prices, departmental settlements and the headroom available for additional commitments.
LCM’s analysis of the pressure created by higher UK borrowing on the public-sector construction pipeline explained why announced programme value and affordable annual expenditure are different measures. The October Budget must be read in the same way. A policy can be strategically supportive of construction while still facing constrained annual capital budgets and strict project prioritisation.
The sector should therefore read the Treasury documents and OBR forecast together. The important evidence will include revised borrowing and debt, compliance with the fiscal rules, departmental capital expenditure, local-government finance, mayoral tax assignments and any change in the cost or timing of existing programmes.
Construction Has Until 9 September to Submit Budget Evidence
HM Treasury has opened its Autumn Budget 2026 Representation Portal and will accept submissions until 23:59 on Wednesday 9 September. The portal asks contributors to address matters including effectiveness, value for money, revenue implications, growth, employment, sectoral and locational effects, administrative costs and environmental impact.
For construction and the built environment, useful representations should go beyond requests for a larger headline allocation. They could provide evidence on the programme consequences of short funding periods, infrastructure dependencies, local-authority technical capacity, grant discontinuity, borrowing restrictions, procurement delays and the cost of repeatedly stopping and restarting project development.
Publish a transparent baseline: show the grants being replaced and the net funding position for every mayoral strategic authority.
Create revenue safeguards: provide floors, reserves or safety nets so that long-term construction commitments are not destabilised by a short-term fall in tax receipts.
Clarify capital and borrowing rules: explain which revenues can support infrastructure finance and what affordability tests will apply.
Protect delivery capability: allow regional and local bodies to retain the planners, engineers, surveyors, commercial teams and programme managers needed to prepare projects.
Require investable pipelines: connect devolved funding to named programmes with clear clients, maturity stages, dependencies and routes to procurement.
What Construction Businesses Should Do Before the Budget
Contractors and consultants should not wait for 28 October to begin assessing regional opportunities. Mayoral strategic authorities and local partners are already developing local growth plans, integrated programmes and investment propositions. The useful work now is to distinguish mature demand from political ambition.
Map the responsible client: identify whether each opportunity belongs to the mayoral authority, a borough or council, a transport body, a housing provider, a utility or a development partnership.
Check funding maturity: separate an indicative pipeline from approved capital, borrowing authority, grant agreement and procurement budget.
Track enabling constraints: examine land, planning, utilities, remediation, building control, design and access before treating a scheme as near-term workload.
Prepare for regional procurement: maintain evidence covering competence, local supply chains, apprenticeships, social value, financial resilience and delivery capacity.
Protect working capital: a larger public pipeline can still damage contractors if mobilisation, retention and payment requirements grow faster than cash receipts.
What UK Construction Should Watch on 28 October
The fiscal-devolution roadmap: the authorities covered, implementation dates and taxes included.
The assigned percentages: the shares of business-rate and income-tax revenue and how the regional baseline is calculated.
Grant replacement: the funding streams reduced, consolidated or protected and the transition arrangements.
Equalisation and gain share: the treatment of need, weaker tax bases, London’s revenue base and additional growth.
Borrowing and capital flexibility: whether stable revenue can support earlier infrastructure investment and multiyear contracts.
Departmental capital budgets: whether housing, transport, remediation, energy and public-estate programmes are protected, expanded or reprofiled.
London’s bespoke settlement: how the GLA’s integrated funding, existing business-rate arrangements and high delivery costs are treated.
Early project conversion: whether the Budget identifies delivery bodies, named programmes and practical routes from regional finance to procurement.
LCM Verdict: 28 October Will Test Whether Devolution Changes Construction Delivery or Only the Accounting
The confirmed Budget date gives the construction industry a clear point at which the government’s regional-growth model must become financially testable. A share of income tax and greater business-rate retention could give mayors more control, better visibility and a stronger incentive to expand their economies. Those benefits could support housing, retrofit, transport, regeneration and enabling infrastructure.
But the reform begins from fiscal neutrality. Assigned taxes will replace at least some grants, equalisation will redistribute part of the benefit and revenue will not become construction capital without workable spending and borrowing rules. The value cannot be measured from a tax percentage in isolation.
For London, the opportunity is greater coordination between an established housing programme, stalled-site finance, transport, utilities and borough delivery. The risk is that a large tax base produces a large headline while the net settlement remains constrained by grant replacement, redistribution and the capital’s high delivery costs.
Final LCM assessment: The 28 October Budget will be construction-positive only if fiscal devolution produces durable net resources, transparent equalisation, usable capital powers and delivery-ready regional pipelines. If tax assignment merely replaces grants without improving certainty, flexibility or investment capacity, it will change the accounting relationship with Westminster without materially increasing the number of projects reaching site.
Frequently Asked Questions
When is the 2026 Budget?
The Chancellor has confirmed that the Budget will be delivered on Wednesday 28 October 2026. The Office for Budget Responsibility will publish an economic and fiscal forecast on the same date.
The Chancellor has confirmed that the Budget will be delivered on Wednesday 28 October 2026. The Office for Budget Responsibility will publish an economic and fiscal forecast on the same date.
Why does the Budget matter to regional construction?
It is expected to contain the fiscal-devolution roadmap, including further detail on business-rate and income-tax revenue for mayoral strategic authorities. The design will affect how regions plan and potentially finance housing, transport, regeneration and infrastructure.
It is expected to contain the fiscal-devolution roadmap, including further detail on business-rate and income-tax revenue for mayoral strategic authorities. The design will affect how regions plan and potentially finance housing, transport, regeneration and infrastructure.
Is fiscal devolution a new construction fund?
No. The reform concerns the allocation and control of existing tax revenue. Government says it will begin on a fiscally neutral basis, with grant funding reduced where assigned tax revenue is transferred.
No. The reform concerns the allocation and control of existing tax revenue. Government says it will begin on a fiscally neutral basis, with grant funding reduced where assigned tax revenue is transferred.
Will mayors be able to change income-tax rates?
No such power has been announced. Government policy states that the roadmap concerns sharing existing revenue and does not involve devolving control over income-tax rates or thresholds.
No such power has been announced. Government policy states that the roadmap concerns sharing existing revenue and does not involve devolving control over income-tax rates or thresholds.
Will London retain all income tax and business rates generated in the capital?
That has not been proposed. London’s allocation will depend on the assigned share, existing arrangements, grant replacement and the national equalisation system. A large local tax base does not mean all locally generated revenue will remain in London.
That has not been proposed. London’s allocation will depend on the assigned share, existing arrangements, grant replacement and the national equalisation system. A large local tax base does not mean all locally generated revenue will remain in London.
Can mayors borrow against the new revenues?
The detailed framework has not yet been confirmed. The Budget must explain whether assigned revenue can support additional borrowing or multiyear capital commitments and what affordability safeguards will apply.
The detailed framework has not yet been confirmed. The Budget must explain whether assigned revenue can support additional borrowing or multiyear capital commitments and what affordability safeguards will apply.
Does London already have funding for housing delivery?
Yes. The London Social and Affordable Homes Programme provides up to £11.7 billion for 2026–36, and the City Hall Developer Investment Fund has an initial allocation of up to £324.39 million. These existing commitments should not be counted again as new October Budget funding.
Yes. The London Social and Affordable Homes Programme provides up to £11.7 billion for 2026–36, and the City Hall Developer Investment Fund has an initial allocation of up to £324.39 million. These existing commitments should not be counted again as new October Budget funding.
When is the deadline for Budget representations?
HM Treasury’s Autumn Budget 2026 Representation Portal closes at 23:59 on Wednesday 9 September 2026.
HM Treasury’s Autumn Budget 2026 Representation Portal closes at 23:59 on Wednesday 9 September 2026.
Sources and methodology: This article was prepared using official information available on 1 August 2026. The Budget date and policy direction were checked against HM Treasury’s 28 October Budget announcement and the Chancellor’s letter to the Treasury Select Committee. The timing and direction of mayoral tax retention were reviewed against the government’s income-tax and business-rate devolution announcement. Fiscal neutrality, grant replacement, equalisation, gain share and business-rate options were checked against the official Northern Growth Strategy: Next Steps and the Mayoral Strategic Authority funding explanatory note. The economic baseline was checked against the OBR’s March 2026 Economic and Fiscal Outlook. London’s existing programme position was reviewed against the London Social and Affordable Homes Programme 2026–36, the City Hall Developer Investment Fund decision and the London Infrastructure Framework. The submission deadline and assessment considerations were verified through HM Treasury’s Autumn Budget 2026 Representation Portal. Confirmed policy, existing programme values and LCM analysis of potential construction consequences are distinguished throughout. No unannounced regional allocation, borrowing power or guaranteed project has been presented as fact.
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Expert Verification & Authorship: Mihai Chelmus
Founder, London Construction Magazine | Construction Testing & Investigation Specialist |
