πŸ›‘ National Overdevelopment Indicator (NODI)

A smarter test for when a place has done more than its fair share

🎯 Purpose:

To create a transparent, nationwide measure that shows when a local area has reached or exceeded its sustainable growth capacity β€” in terms of population density, infrastructure strain, housing growth, and environmental resilience.


πŸ“Š Indicator Structure:

CategoryMeasureTrigger Thresholds
πŸ§β€β™‚οΈ Population DensityPeople per kmΒ² (excluding protected/non-developable land)🟑 >500/kmΒ²
πŸ”΄ >750/kmΒ²
🏘️ Cumulative Housing Growth% growth in dwellings since 2011 census🟑 >20% growth
πŸ”΄ >35% growth
πŸ₯ GP and School StrainPatient list size per GP / Pupil places per school catchment🟑 over 95% capacity
πŸ”΄ over 110%
🌱 Net Green Infrastructure LossChange in accessible green space per capita🟑 loss of >10% since 2011
πŸ”΄ >20%
πŸ—οΈ % of Homes via Windfall Sites% of homes approved outside the Local Plan in last 5 years🟑 >25% windfall
πŸ”΄ >40%
🐝 Biodiversity StressNet biodiversity change on development sites (post-2023)πŸ”΄ if net gain <10% overall
🚧 Infrastructure Response TimeTime taken to deliver physical infrastructure linked to housing expansionπŸ”΄ if >50% of required infra is delayed by >3 years

🧠 How It Would Work:

  • Each local planning authority reports annually into the indicator (data is already mostly available via AMRs and monitoring).
  • Each settlement or district is scored across all indicators.
  • A combined score triggers a status:
    • βšͺ Stable
    • 🟑 Stretched (requires mitigation)
    • πŸ”΄ Overdeveloped (development freeze or EIA/mitigation mandatory)
  • Developers must justify new major proposals in areas marked as 🟑 or πŸ”΄ with cumulative impact statements.

🏁 Why We Need It:

  • Current systems only look at supply vs demand, not cumulative harm.
  • Windfalls and tilted balance schemes are being approved in places that have already seen exponential growth.
  • We need to build with intention, not as a by-product of developer strategy.
  • This indicator gives councils the tools to say “enough” β€” and to prove it in appeals.

πŸ“Œ Next Steps:

  • Pilot this framework in East Hampshire (starting with Medstead and Four Marks)
  • Lobby DLUHC and MPs to integrate this into future planning reform
  • Publish district status maps publicly, alongside housing stats

🌱 What is a Garden Town?

A Garden Town is:

  • A self-contained, master-planned development, often for 10,000+ homes
  • Inspired by the early 20th-century Garden City movement (e.g. Letchworth, Welwyn), which aimed to combine the best of town and countryside
  • Supported by central government through Homes England, which may provide funding or infrastructure assistance

πŸ—οΈ Key Features:


  • High-quality design and layout
  • Integrated transport and schools
  • Environmental sustainability
  • A long-term stewardship model for public spaces
  • Infrastructure-first approach (roads, GP surgeries, broadband, etc.)

πŸ“ Examples:


  • Bicester Garden Town (Oxfordshire)
  • Didcot Garden Town
  • North Essex Garden Communities
  • Gilston Garden Town (Harlow and Gilston)

🚨 Relevance to EHDC?


East Hampshire is not currently hosting a government-designated Garden Town, but:

  • If EHDC wanted to deliver large-scale new settlements, it could bid for Garden Town status.
  • This may unlock funding, technical support, and planning flexibilities.
  • It would require EHDC to prepare a detailed strategic framework, potentially via the Local Plan.

⚠️ WEAK POINTS OF “AFFORDABLE HOUSING” – LOOPHOLES

Here’s where the system breaks down:

1. β€œAffordable” is not affordable


  • In expensive places, 80% of market rent is still wildly unaffordable.
  • Shared ownership or discounted homes can cost more per month than renting privately.

πŸ“ Example: In parts of Hampshire or Surrey, β€œaffordable rent” might still be Β£900–£1,100/month β€” out of reach for many people on ordinary wages.

2. Developers can wriggle out of providing it


  • If a developer says providing 40% affordable housing will make a site β€œunviable”, councils are legally required to consider that.
  • These β€œviability assessments” are often not made public, and developers overestimate costs to reduce their obligations.

πŸ“‰ Result: Councils often approve developments with only 10%–20% affordable housing, even when the Local Plan says 40%.

3. Affordable housing can be sold off


  • Some affordable homes (especially shared ownership) are later converted to market housing.
  • There’s no strong legal guarantee that affordable homes stay affordable forever β€” especially for First Homes or Shared Ownership.

4. Definition includes expensive β€˜starter homes’


  • Because the legal definition includes β€œdiscounted market homes” and First Homes, very expensive properties still count as β€œaffordable”.
  • These homes often go to middle-class buyers, not people in genuine housing need.

5. Not enough social rent


  • The most urgently needed homes β€” true social rent β€” are rarely delivered.
  • Developers prefer shared ownership or First Homes because they’re more profitable.
  • Councils don’t have enough funding or land to build them directly.

6. Enforcement is weak


  • Even when developers agree to provide affordable housing, there’s poor monitoring of delivery and occupancy.
  • Councils may not have staff to enforce the long-term conditions.

Summary Table: Weaknesses in the System


IssueWhy it’s a problem
β€œAffordable” still means expensive80% of market rent is too much in most areas
Developers use viability excusesReduces affordable housing below target
No long-term affordabilityShared ownership and First Homes can be resold at market
Definition too broadIncludes homes unaffordable to many in need
Social rent underdeliveredLeast profitable = least built
Weak enforcementPromises made at planning stage often go unchecked

What Is β€œAffordable Housing”?

β€œAffordable housing” in planning doesn’t mean what most people think. It’s not just β€œcheap.” It’s a legal category for homes that are:

  • Below market price or rent
  • Reserved for people who can’t afford normal prices
  • Delivered by councils or developers as part of planning rules

There are 4 main types

Social Rent


  • The cheapest option
  • Rent based on a fixed formula (not market prices)
  • For people on very low incomes
  • Usually council or housing association homes

Affordable Rent


  • Up to 80% of local market rent
  • Still expensive in high-cost areas
  • Often built by housing associations using public subsidy

Shared Ownership


  • You buy part of the home, rent the rest
  • Deposit is lower than buying outright
  • Monthly payments often still high
  • You can β€œstaircase” up to buy more over time

First Homes


  • A government scheme for first-time buyers
  • Must be sold at 30% discount
  • Must be under Β£250,000 (or Β£420,000 in London) after the discount
  • Buyer’s income must be under Β£80,000 (Β£90,000 in London)

βœ… Definition of a Deliverable Housing Site

Under the National Planning Policy Framework (NPPF) β€” specifically Annex 2 (Glossary) β€” a site is considered deliverable if it is available now, offers a suitable location for development now, and is achievable with a realistic prospect that housing will be delivered on the site within five years.

Deliverable sites must fall into one of these categories:

  1. Sites with Detailed Planning Permission (full planning permission or reserved matters) β€” automatically considered deliverable unless there is clear evidence they won’t be built in time.
  2. Sites with Outline Planning Permission, Allocation in a Development Plan, or Permission in Principle β€” only considered deliverable if there is clear evidence of:
    • Progress toward delivery (e.g. site viability, infrastructure in place),
    • A developer is on board,
    • Housing completions are expected within five years.

πŸ“Œ So, not every site with permission counts β€” only those that meet these tests.

πŸ” How Councils Prove Deliverability


To include a site in the 5-Year Housing Land Supply, the council must show evidence that supports its delivery within 5 years. This often includes:

  • Recent site activity (construction start or infrastructure work)
  • Signed S106 agreements (legal agreements securing planning obligations)
  • Developer commitments or delivery programmes
  • Viability appraisals showing the site is financially feasible
  • Infrastructure plans and funding in place (e.g. roads, drainage)

πŸ“Š Where This Appears


All this is documented in the Housing Land Supply Statement (or interim statement), where the council provides:

  • A list of individual sites (with status, capacity, delivery timeline)
  • A schedule of projected completions per year
  • Evidence that supports the inclusion of each site

πŸ“Š How It’s Measured


Each site included in the land supply must state:

  • The number of dwellings it is expected to deliver within the 5-year period.
  • A delivery timeline (how many homes will be completed each year).
  • Supporting evidence to justify that timeline (e.g. planning status, developer activity, infrastructure availability).

βœ… So for example:

  • A site with full planning permission for 120 homes, with the builder confirming 60 units/year, would contribute 120 dwellings to the 5YHLS β€” assuming the delivery is within five years.

πŸ” Why This Matters


Because the requirement is also set in housing units (e.g. 451 homes/year for EHDC), the council must match that with deliverable homes β€” not just land availability.

Interim Housing Land Supply Position Statement

The term “interim housing land supply position statement” is not defined in national planning legislation, but is commonly used by local planning authorities like EHDC (East Hampshire District Council) to refer to:

A temporary or informal summary of the council’s current land supply status, prepared in the absence of an up-to-date Local Plan or formal Housing Land Supply Statement.

When is an Interim Statement Used?


An interim position statement may be published when:

  • The Local Plan is out of date.
  • A full Housing Land Supply Statement has not yet been completed or published for the current monitoring year.
  • The council is awaiting confirmation of housing delivery numbers (e.g. completions, permissions).
  • There is uncertainty due to appeals or legal challenges that affect the 5-Year Housing Land Supply.

It is a way for the council to indicate its estimated position, e.g. stating that it believes it has 3.2 years’ worth of deliverable housing land, pending final verification.

Status of Interim Statements


  • Not binding β€” unlike a formally published 5-Year Housing Land Supply Statement.
  • Subject to change β€” as new data or appeal decisions are incorporated.
  • May be used by officers to inform development management decisions, especially for tilted balance cases.

Relevance to Tilted Balance


If the council publishes an interim statement indicating it cannot demonstrate a full 5-year supply, this can trigger Paragraph 11(d) of the NPPF, meaning the tilted balance applies:

Planning permission should be granted unless the adverse impacts would significantly and demonstrably outweigh the benefits.

In such cases, the council must still apply planning judgment and local policies β€” but with less control due to the shortfall.

🏘️ What Is a Housing Land Supply Statement (HLS Statement)?

The Housing Land Supply Statement is often published alongside or within the AMR. It specifically shows:

  • How many deliverable housing sites EHDC currently has
  • Whether this land is enough to meet its 5-year housing need
  • A calculation of the β€œhousing land supply position” β€” expressed in years (e.g. 2.7 years)

If the council cannot demonstrate a 5-year supply, national planning rules apply β€” including the tilted balance.

πŸ—“οΈ How Often Are Housing Targets Updated β€” and by Whom?

Housing targets for councils like East Hampshire District Council (EHDC) are calculated using the government’s Standard Method, which must be applied annually.

βœ… Who Sets the Rules?


The Department for Levelling Up, Housing and Communities (DLUHC) sets the rules through:

  • The National Planning Policy Framework (NPPF)
  • The associated Planning Practice Guidance (PPG)

πŸ“ˆ What Gets Updated?


  1. Household growth projections
    • Provided by the Office for National Statistics (ONS)
    • Usually updated every few years (currently using 2018-based projections)
  2. Affordability ratios
    • Published annually by DLUHC
    • Based on median house prices and earnings in each local authority
  3. The council’s Local Plan status
    • If the Local Plan is out of date (over 5 years or inconsistent with the NPPF), then no cap is applied to the housing need figure

πŸ”„ When Do Councils Update Their Figure?


  • The housing need number must be recalculated each year, usually as part of the council’s Annual Monitoring Report or Housing Land Supply Statement.
  • Even if a Local Plan is in place, this calculation ensures that councils are using up-to-date demand data.

πŸ“‹ Material Planning Considerations and the Consultees Who Inform Them – Explained Through a Health Check Analogy

Before examining specific material considerations, it’s important to understand that planning consultees participate at different stages of the Environmental Impact Assessment (EIA) and planning process. Their feedback plays a crucial role in identifying risks, shaping assessments, and informing final decisions β€” just as specialist doctors and technicians inform each stage of a health diagnosis and treatment plan. A good planning decision, like a safe medical procedure, depends on thorough checks, qualified input, and a clear understanding of the patient β€” in this case, the community and its environment.

Currently, it appears EHDC does not publish a formal methodology or checklist to determine which consultees should be engaged at which stage. Selection is made on a case-by-case basis by planning officers, guided by statutory requirements, experience, internal guidance, and discretionary judgment. While this allows for professional flexibility, it also introduces risk of inconsistency. (As of writing, it appears no formal EHDC framework has been published online for how ‘relevance to the development’ is determined β€” source: EHDC planning portal and policy pages, April 2025.)

🧭 Types of Consultees by Stage:

πŸ“Š Why EHDC Should Adopt a Transparent Consultee Relevance Policy

Currently, it appears EHDC relies on officer judgment and internal precedent to decide whether a consultee is “relevant to the development.” Without clear criteria, this creates inconsistencies, potential unfairness, and missed environmental or infrastructure risks. To strengthen this process, EHDC should adopt a formal Consultee Relevance Scoring Matrix, aligned with both legal obligations and site-specific impact.

This scoring model would:

  • βœ… Standardise when non-statutory consultees are triggered
  • βœ… Improve public transparency and trust
  • βœ… Reduce legal vulnerability (e.g. Judicial Review)
  • βœ… Ensure consistent consideration of cumulative and sensitive site pressures
Impact TriggerExample CriteriaSuggested ScoreRelevant Consultee(s)
Flood Risk or Surface Water DrainageSite falls in Flood Zone or shows surface runoff risk3 (automatic)Environment Agency, LLFA
Highways Access or SafetyAdjacent to classified road, access concerns raised by Highways Officer2–3Local Highways Authority, National Highways
Heritage or ArchaeologyNear listed building, conservation area, or archaeology site3 (automatic)Historic England
Biodiversity or Habitat ImpactWithin/adjacent to SSSI, SAC, ancient woodland, green infrastructure3 (automatic)Natural England, EHDC Ecologist
Health Service Capacity50+ dwellings or catchment near full-capacity GP practices2–3NHS / ICB
Education Pressure30+ dwellings or known school place shortage2HCC Education
Cumulative Growth Pressure (5 years)Area exceeds EHDC-defined % housing/population growth thresholds3 (automatic)Multiple consultees (triggered via EIA or validation)
Wastewater, Sewage, Utilities CapacityNew discharge point, off-grid, or recent complaints in area2–3Southern Water / utility provider
Parish or Public Comment on Technical RiskCredible concerns raised in formal representations1–2Relevant technical consultee (varies)

Scoring Thresholds:

  • 3 points = mandatory consultation
  • 2 points = expected unless clearly justified otherwise
  • 1 point = discretionary but should be documented if omitted

This would complement, not replace, the legal obligations already mapped in the following table:

To clarify how different consultees engage throughout the development process, the following matrix shows when each consultee typically participates β€” at EIA Screening, EIA Scoping, Full EIA (Environmental Statement), or the Planning Application stage.

A βœ… indicates statutory participation, ◻️ represents non-statutory but commonly expected practice, and ❌ shows no formal involvement at that stage. Notes clarify statutory duties, best practice roles, and site-sensitive involvement.

ConsulteeEIA ScreeningEIA ScopingFull EIA (ES)Planning ApplicationNotes
Environment Agency (EA)βœ… (statutory)βœ… (statutory)βœ… (statutory)βœ… (statutory)Statutory where flood risk or water quality is involved
Natural Englandβœ… (statutory)βœ… (statutory)βœ… (statutory)βœ… (statutory)Required where biodiversity or designated sites affected
Historic Englandβœ… (statutory)βœ… (statutory)βœ… (statutory)βœ… (statutory)Statutory for heritage settings and archaeological impacts
Lead Local Flood Authority (LLFA)βœ… (statutory)βœ… (statutory)βœ… (statutory)βœ… (statutory)Statutory consultee for surface water/flooding
National Highwaysβœ… (statutory)βœ… (statutory)βœ… (statutory)βœ… (statutory)Statutory for proposals affecting strategic roads
Local Highways Authority◻️ (non-statutory)βœ… (expected)βœ… (expected)βœ… (expected)Non-statutory but standard practice at all stages
EHDC Environmental Health◻️ (non-statutory)βœ… (expected)βœ… (expected)βœ… (expected)Assesses air, noise, amenity impacts
EHDC Ecologist / Wildlife Trust◻️ (non-statutory)βœ… (expected)βœ… (expected)βœ… (expected)Local non-statutory consultees for biodiversity
Southern Water / Utility Providers◻️ (non-statutory)βœ… (site-dependent)βœ… (site-dependent)βœ… (frequently engaged)Non-statutory, often essential for capacity input
NHS / ICB◻️ (non-statutory)◻️ (best practice)◻️ (best practice)◻️ (routinely consulted)Non-statutory at all stages; increasingly involved due to population growth and health service strain
HCC Education❌ (discretionary)◻️ (context-sensitive)◻️ (expected)◻️ (expected)Non-statutory; engaged where school capacity is affected
EHDC Planning Policy / Urban Design❌ (internal)◻️ (required input)◻️ (required input)◻️ (required for compliance)Internal consultee for policy/design compliance
Parish Councils❌ (not statutory)❌ (not statutory)◻️ (public comment)βœ… (consulted by law)Required to be consulted on applications; may comment on ES if published
General Public❌ (not included)❌ (not included)βœ… (consultation required)βœ… (consultation required)Legal right to comment on ES and planning applications

These stages build upon one another. For example, concerns raised at screening may lead to scoping input, which influences the depth of the Environmental Statement. Later, feedback on the full planning application must reflect and incorporate the evidence and conditions shaped through earlier stages.


When deciding whether to approve a development or request a full Environmental Impact Assessment (EIA), Local Planning Authorities (LPAs) must consider whether the proposal will cause significant impacts. These impacts must be understood through the lens of material planning considerations β€” legally recognised issues that affect the use and development of land in the public interest.

This table maps material considerations to the planning consultees who inform them, using a health check analogy to help clarify each role. Statutory and non-statutory consultee designations are also indicated, as well as their relevance to the screening and assessment process.

Material ConsiderationRelevant Consultee(s)Mandatory StatusHealth Analogy
πŸš— Traffic and AccessNational Highways, Local Highways Authorityβœ… / ❌ (depending on road type)🦴 Orthopaedic / πŸ’ͺ Musculoskeletal – ensure the body’s transport systems can move safely
🌧️ Flood RiskEnvironment Agency, Lead Local Flood Authorityβœ… StatutoryπŸ’§ Vascular / 🩺 Kidney – prevent flooding and ensure water balance
🌬️ Air and Water QualityEA, Environmental Health, Natural Englandβœ… / ❌ (depending on scope)🫁 Pulmonologist / Nephrologist – clean air and filtered water support systemic health
🌿 Environmental ImpactNatural England, EHDC Ecologist, Wildlife Trustβœ… / ❌ (varies by case and designation)🌬️ Respiratory / 🧬 Immune – detect environmental stress and defend against long-term harm
πŸ₯ Infrastructure and ServicesNHS / ICB, HCC Education, Utility Providers❌ Non-statutory (best practice)πŸ₯ Capacity planner / πŸ§’ Paediatrician – checks system load and growth readiness
🧱 Heritage and ConservationHistoric Englandβœ… Statutory🧠 Memory care specialist – protects long-term cultural identity
🧍 Residential AmenityEHDC Case Officer, Environmental Health❌ Non-statutoryπŸ›οΈ Quality of life check – light, noise, smell, overbearing effects
πŸ’Ό Economic ImpactEconomic Development Officer, Applicant❌ Non-statutoryπŸ“ˆ Health economics – benefit vs risk analysis
🏘️ Land Use (Site Suitability)EHDC Planning Policyβœ… (Development Plan must be used)🧾 Eligibility check – confirms if the land is suitable for this form of treatment
βš–οΈ Local & National Planning PolicyEHDC Planning Officerβœ… Required by lawπŸ“‹ Treatment protocol – ensures the surgery follows national health guidelines
🎨 Design and AppearanceEHDC Urban Design / Planning Officer❌ Non-statutoryπŸ‘οΈ Cosmetic specialist – ensures the development integrates aesthetically and functionally
πŸ”„ SustainabilityPlanning Policy, Environment, Transport Teams❌ Emerging standard🧬 Preventative medicine – ensures long-term recovery, not just survival
πŸ“£ Public OpinionPublic / Parish Councilsβœ… Publicity and participation required by law; material comments must be consideredπŸ‘ͺ Carers / family – provide lived experience and flag risks otherwise missed

πŸ“£ Clarifying Public Involvement: Notification vs Consultation on EIA

For the General Public, it’s important to distinguish between two types of legal engagement:

  • βœ… Must be notified (Planning Application Stage): This is a legal requirement under the Town and Country Planning Act 1990. The local authority must publish or issue notices to inform residents of planning applications. The public then has a right to comment, and any material concerns must be considered.
  • βœ… Must be consulted on the Environmental Statement (Full EIA): Under the EIA Regulations 2017, when a full Environmental Impact Assessment (EIA) is required, the developer submits an Environmental Statement (ES). The public must be given at least 30 days to read and respond to the ES. These comments must be formally reviewed before a planning decision is made.

πŸ” In short: Notification gives the public the right to speak; consultation on the ES gives them the right to respond to technical findings β€” both are legally required, but serve different purposes.


πŸ“˜ Clarifying Terms: “Statutory” vs “Required by Law”

In planning and EIA contexts, both terms imply legal obligations, but they differ in scope:

  • βœ… Statutory means the consultee is specifically named in legislation or regulations and must be consulted when relevant (e.g. Environment Agency, Historic England).
  • βœ… Required by law refers more broadly to legally mandated processes (like public consultation or publication), not tied to any specific named consultee. It covers duties such as notifying the public of planning applications or consulting them on Environmental Statements.

In short: Statutory = a named organisation must be consulted.
Required by law = a process or outcome must happen under legal duty.


πŸ“š Glossary of Acronyms

  • EA – Environment Agency
  • LLFA – Lead Local Flood Authority
  • ICB – Integrated Care Board (NHS)
  • SSSI – Site of Special Scientific Interest
  • SAC – Special Area of Conservation
  • HCC – Hampshire County Council
  • EHDC – East Hampshire District Council
  • LPA – Local Planning Authority
  • EIA – Environmental Impact Assessment
  • ES – Environmental Statement

⚠️ Notes on Materiality and Legal Weight

  • Public comments are only relevant if they relate to material considerations
  • LPAs must publish reasoning when rejecting or accepting input that raises these issues
  • Many consultees provide input under multiple headings, and the final judgment rests with the LPA
  • While not all consultees are statutory, they often raise issues that have legal weight if ignored

This framework helps EHDC and other LPAs ensure that decisions are:

  • βœ… Legally defensible
  • βœ… Environmentally and socially responsible
  • βœ… Aligned with both planning policy and real-world service capacity