London is preparing to adjust how it charges developers for new infrastructure, as a fresh consultation on relief to the Community infrastructure Levy (CIL) lands at a critical moment for the capital’s planning and housing markets. The CIL, a charge levied on new progress to fund local infrastructure, has long been a flashpoint between councils seeking funding for services and developers arguing levies can undermine scheme viability. The latest consultation, set out in a new Savills briefing, proposes targeted reliefs intended to reshape who bears those costs and how development is incentivised across the city. For developers, landowners and local authorities, the proposals could alter project appraisals, affordable housing delivery and the balance of infrastructure funding – while prompting fresh debate over equity, timing and practical implementation. Stakeholders now face a narrow window to scrutinise the detail and make their views known before any changes are finalised.
Incoming Community Infrastructure Levy relief in London The latest consultation proposals scope and anticipated timeline
London’s draft relief framework concentrates on targeted exemptions and streamlined processes to unblock development while protecting strategic infrastructure funding. The consultation frames relief around four priority areas: affordable housing delivery, small and medium-sized housebuilders, the conversion of vacant commercial space, and sites delivering net zero gains. Respondents are being asked to weigh trade-offs – such as whether relief should be capped by value,phased by delivery milestones,or contingent on planning obligations – and to propose safeguards to avoid revenue leakage. Key considerations set out in the consultation include:
- Eligibility criteria for different typologies (residential, mixed-use, industrial conversions)
- Temporal triggers for relief (start on construction, completion, or post-occupation)
- Interaction with existing Mayoral and borough-level planning tools
The overall aim is pragmatic: direct relief where it most increases build-out without undermining long-term infrastructure investment.
The process that follows the consultation is described in staged terms to give developers and councils clarity about lead times and decision points. Officials expect a short period for analysis of responses,followed by policy refinement and guidance for boroughs to amend their charging Schedules or adopt local variations. Anticipated milestones highlighted in the materials are: consultation analysis, draft final policy, borough implementation guidance and a phased roll-out with monitoring and review. A compact summary table sets the likely sequencing and relative duration for each stage:
| Stage | Purpose | Scale/Timing |
|---|---|---|
| Consultation analysis | Assess responses and impact | Short |
| Policy refinement | Prepare guidance and legal checks | Medium |
| Implementation & monitoring | Borough adoption and review | Phased/ongoing |
Stakeholders are advised to engage now: the design choices in this window will determine whether relief becomes a targeted enabler or a broadly applied concession with budgetary consequences for London’s infrastructure programme.
How the proposed relief would affect development viability and affordable housing delivery Evidence and Savills analysis
Savills’ modelling shows the proposed relief would materially alter development economics in London, with the most pronounced benefits concentrated on small- and medium-sized private schemes that currently struggle to clear viability tests. Our evidence review finds that by reducing upfront CIL burdens, the policy is likely to unlock stalled schemes and marginally improve developer margins, but it does not automatically translate into more affordable homes unless accompanied by calibrated planning obligations. Key considerations emerging from the analysis include:
- Scale sensitivity – small sites see a proportionally larger uplift in viability.
- Displacement risk – relief may divert cross-subsidy that would otherwise fund on-site affordable units.
- Timing effects – earlier cashflow improvements could accelerate completions and delivery timelines.
These dynamics point to a trade-off between stimulating supply and safeguarding long-term affordable housing funding streams.
Quantitative scenarios illustrate likely outcomes and policy levers. In our illustrative table below, Savills sets out three simple scenarios to show the directional impact on annual CIL receipts and net affordable homes delivered across Greater london. The analysis suggests that a targeted, time-limited relief would minimise revenue loss while supporting viability, whereas a broad, permanent relief risks a measurable drop in affordable provision unless choice funding is secured. Policymakers should therefore consider linking relief to explicit affordable housing retention or replacement mechanisms to protect delivery at scale.
| Scenario | Estimated CIL change | Net affordable homes (annual) |
|---|---|---|
| No relief (baseline) | 0% | ~12,000 |
| Targeted relief (proposed) | -8% to -12% | ~11,000-11,500 |
| universal relief | -20%+ | ~9,500-10,000 |
Practical responses for developers landowners and local authorities Steps to mitigate risk and unlock benefits
Rapid, site-specific appraisal is the immediate priority: developers and landowners should run updated viability models under the proposed CIL rates to identify marginal sites and quantify the uplift required to keep schemes deliverable. Early engagement with the borough – sharing appraisals and draft infrastructure delivery plans – reduces uncertainty and creates room to secure phased relief, bespoke payment schedules or targeted exemptions. Adopt a pragmatic documentation approach that ties heads of terms, viability buffers and delivery milestones into planning agreements so that risk is allocated transparently and can be revisited if market conditions shift.
- Model multiple scenarios (baseline, downside, upside) and publish a short sensitivity table to guide negotiation.
- Propose staged payments or performance-linked triggers to protect cashflow on marginal sites.
- Lock in delivery through infrastructure phasing and simple monitoring covenants.
Local authorities must match clarity with flexibility: set a obvious charging schedule, publish prioritised infrastructure lists and offer clear routes to apply for relief or deferment. Landowners should use these signals to structure land disposals and option agreements that reflect CIL exposure, while developers should push for bespoke heads of terms that share upside and downside fairly. Where possible, all parties should pilot standardised templates for relief applications and monitoring returns to reduce administrative friction and accelerate consent to build.
- Publish prioritised projects so payments fund visible outcomes that sustain community support.
- use simple risk‑sharing clauses in land contracts to avoid value disputes at later stages.
- agree review triggers tied to market indices so charges can be recalibrated without re-opening consents.
Recommendations for consultation responses and implementation Best drafting points monitoring and transition arrangements
Practical consultation responses should be short, evidence‑lead and solution‑oriented. Focus yoru submissions on where relief criteria,liability points and exemptions will materially affect viability and delivery,and include clear suggestions rather than only critiques. Recommended drafting points:
- Align relief tests with existing planning definitions and provide worked examples of typical schemes.
- Propose simple, objective triggers (e.g.unit size, affordable housing threshold) to minimise disputes.
- Include sunset clauses or review windows to allow future recalibration without retroactive liabilities.
- Request mandatory proportionality checks and a requirement for impact assessment from boroughs before applying new reliefs.
Emphasise quantifiable evidence-cashflow modelling, comparables and short case studies-to persuade decision‑makers that your drafting reduces administrative burden while protecting revenue.
Implementation should be accompanied by a tight monitoring and transition framework that limits market uncertainty. Practical measures to include in responses are:
- Baseline data publication at adoption and scheduled reporting on CIL receipts and relief usage.
- Clear governance responsibilities for governance, appeals and data sharing between planning and finance teams.
- Phased transition arrangements (e.g. grandfathering, limited amnesty periods) to avoid penalising schemes consented under previous rules.
| Action | Owner | Timing |
|---|---|---|
| Impact assessment publication | Local authority | Before adoption |
| monitoring report (first two years) | Planning & Finance teams | Quarterly |
| Phased relief/transition window | Council decision‑makers | 12 months |
These measures help ensure reliefs are transparent,administrable and reversible if economic or delivery impacts diverge from projections.
To Wrap It Up
As London shapes the next iteration of its Community Infrastructure Levy relief,the stakes are clear: changes could alter development viability,influence where and what gets built,and shift how boroughs fund local infrastructure. The latest consultation maps out options that seek to balance growth with strategic investment, but the final policy will turn on how well those trade-offs withstand scrutiny from industry, local authorities and communities.
Developers, landowners and council planners should therefore study the proposals closely and respond to the consultation where possible. Close attention to the detail – qualifying criteria, geographic scope, and transitional arrangements – will be critical for assessing project pipelines and informing negotiations at project and site level. Observers should also watch for the administration’s timetable for adoption and any supplementary guidance that will shape practical implementation.
With the consultation now open, the coming weeks will be decisive for stakeholders aiming to influence outcomes or to plan for change. For those seeking technical analysis or to understand implications for specific schemes, specialist advisers can help interpret the proposals and model scenarios ahead of the final decision.