A document most residents will never read — but one that shapes everything
When a planning committee decides which fields get houses built on them, the decision rests on more than politics or land values. Behind the vote sits a stack of technical evidence — and one of the most consequential documents in that stack is one most residents will never open.
The Infrastructure Delivery Plan and Project Schedule, prepared by consultants AECOM for South Kesteven District Council and published in July 2025, is a statutory evidence base document for the council's Local Plan Review. That plan will govern development across the district from 2023 to 2043. The IDP — running to a detailed project schedule dated 17 June 2025 — is the infrastructure answer to the plan's central spatial question: not just where homes should go, but whether the roads, schools, GP surgeries, water mains, and open spaces that those homes require can actually be delivered.
It is not policy. It does not grant or refuse planning permission. What it does is act as a gating mechanism: if the infrastructure a proposed site needs cannot be realistically secured, that allocation can be delayed or redirected elsewhere. In practical terms, this document shapes whether your commute into Grantham deteriorates as new streets fill with traffic, whether there is a GP appointment available on a new estate in 2031, or whether a primary school is ready before the first families move in.
The IDP was reviewed by Cabinet on 3 June 2025 alongside companion studies covering flood risk, water cycles, and strategic highways — a coordinated evidence pack, not a standalone judgement. The Local Plan itself is at Regulation 18 stage, which means early public consultation: the point at which the council is still testing its spatial strategy rather than finalising it. The IDP is, in that sense, the infrastructure reckoning that makes or breaks the plan's ambitions.
The housing number that rewrote the infrastructure sums
Part of what makes the 2025 IDP more demanding than its 2018 predecessor is a figure that arrived from Whitehall, not from South Kesteven's own planning ambitions. In December 2024, the government revised the National Planning Policy Framework and recalculated the standard-method housing need for local authorities across England. For South Kesteven, the effect was significant: the required annual delivery rate rose from 701 to 886 dwellings per year — a 26% uplift. Across the 2023–2043 plan period, that amounts to a minimum of 17,720 homes.
This is not a locally determined target. The council cannot choose to plan for fewer; the NPPF figure sets the floor, and 17,720 is the baseline the IDP must respond to. Nor is it a cap — actual allocations may exceed it.
For a largely rural district of around 143,400 people centred on four market towns, that growth rate is substantial. Transport junctions, school rolls, and GP lists that were designed — or previously modelled in the 2018 AECOM IDP — around a slower pace of development now need to accommodate materially more. The 2025 IDP's task is therefore not a refinement of the earlier plan but a repricing and rephasing of a larger programme, on a timeline that is already running.
Why transport is the plan's biggest pressure point
Transport accounts for more of the IDP's project schedule — by cost and complexity — than any other infrastructure category. Three schemes sit at the top of that hierarchy: A52 junction capacity enhancements near Grantham, the Grantham Southern Relief Road, and the Pennine Way Link Road. The IDP assigns each a delivery period, a responsible partner, and an indicative funding source. What it cannot do is conjure the money.
The plan's near-term delivery window — Phase 3, covering 2025 to 2030 — carries a cost estimate of £400m–£500m across its project schedule. That is a substantial sum for a district-level plan to be attempting to assemble, and it sits entirely within a funding framework that relies on individually negotiated Section 106 agreements rather than a pooled levy. The IDP's own language distinguishes between schemes that are identified and schemes that are funded; many of the largest transport items sit in the first category.
The reason these schemes carry such weight is that they are not supplementary. The A52 junctions, the Southern Relief Road, and the Pennine Way Link Road are infrastructure conditions under which major housing allocations on Grantham's urban fringe can be released at all. A site that depends on junction capacity that does not exist — and has no confirmed delivery route — is a site that risks delay or revision when the Local Plan reaches examination. For the growth areas around Grantham, transport delivery is not a supporting detail: it is the central test.
Schools, GPs, and water — the pressures behind the headlines
Secondary schools in all three of South Kesteven's larger market towns — Grantham, Stamford, and Bourne — are assessed as at or near capacity. The IDP does not treat this as background context: it identifies published-admission-number (PAN) expansions as requirements, with Section 106 contributions from adjacent development sites as the expected funding mechanism. The link between a particular housing site and a particular school's capacity ceiling is direct.
GP surgery provision follows similar logic. Rather than planning new health facilities independently, the IDP maps surgery capacity against specific urban extensions. A new or significantly expanded practice is tied to a defined development area; without the housing, the trigger for NHS commissioners to act may not exist, and without the surgery, the housing may not be deliverable at the scale proposed.
Water is different in character. Anglian Water's Water Recycling Centres must be upgraded to meet Nutrient Management Plan requirements before housing completions in affected catchments can proceed. This is not a preference about timing; it is a technical sequencing constraint with a hard boundary — completions cannot happen until treatment capacity exists.
What connects all three is that delivery responsibility sits with organisations — Lincolnshire County Council, NHS commissioners, and Anglian Water — whose investment cycles do not automatically track the Local Plan's phasing. South Kesteven's lack of a Community Infrastructure Levy compounds this: without a pooled fund, social and utilities infrastructure cannot be triggered independently of individual site negotiations. The timing of each obligation depends on getting the right S106 terms agreed before the development that triggers it begins.
The funding gap: what S106-only delivery means in practice
South Kesteven is unusual among districts of its size in having no Community Infrastructure Levy. The practical consequence is straightforward: when a developer builds homes, they negotiate a site-specific Section 106 agreement covering their contribution to roads, schools, and open space. That agreement is legally tied to their site alone. Contributions from thirty smaller developments cannot be pooled into a single account and drawn down to fund one strategic road. CIL is the mechanism that enables that kind of accumulation — and the council has not adopted it.
The council does hold an S106 closing balance of over £6.6m earmarked for district-wide projects, monitored through its annual Infrastructure Funding Statements, most recently for 2024–2025. For local-scale obligations — a footpath, a play area, a primary school contribution — that is a meaningful pot. Measured against the £400m–£500m cost estimate for Phase 3 transport schemes alone, it illustrates the scale of the gap rather than closing it.
The IDP explicitly identifies where S106 receipts will not cover the full cost of strategic schemes. This is not a flaw in the document — it is the point. By naming the gaps, the IDP creates a formal evidence base that the council can use to bid for government infrastructure funding, seek Homes England support, or approach combined authority and LEP programmes. Those routes are competitive, and none is guaranteed.
What the IDP cannot do is resolve the uncertainty it surfaces. Major schemes whose funding gap remains open at the point of Local Plan examination are exactly the ones inspectors scrutinise most closely.
What the plan deliberately doesn't cover — and why that shapes its conclusions
The IDP's scope is deliberately narrow — housing affordability, Gypsy and Traveller provision, employment land viability, and development management policy are all handled by separate evidence documents. That focus is what allows it to function as a precise technical input rather than a broad growth strategy.
Within that narrower brief, its influence runs through two mechanisms. The first is phasing: each project in the schedule carries a delivery window, and site allocations must align with those windows. A development that depends on a road improvement placed in Phase 3 faces a practical ceiling on when homes can be occupied. The second is the funding gap: where S106 receipts will not cover the full cost of a strategic scheme, an allocation whose enabling infrastructure has an unresolved gap may be phased later, reduced in scale, or made conditional on funding being confirmed before development begins.
Together, these make the IDP a constraint map as much as a delivery programme — identifying not just where growth is needed, but where it is financially and physically achievable within each period.
For Grantham, this matters most where transport, school capacity, and water treatment constraints converge on the same development zones. The A52 improvements, secondary school PAN expansions, and Anglian Water phasing requirements are not separate concerns — they apply simultaneously to the same urban extensions. How quickly those constraints can be resolved, and by whom, will determine which sites move into the early delivery windows and which remain contingent. The schools and surgeries Grantham's next generation will use are already being negotiated into existence through the IDP's project schedule and funding gap tables.
- [1] South Kesteven. https://en.wikipedia.org/?curid=426477 https://en.wikipedia.org/?curid=426477