Soundness at Examination
Start With the Correct Tests and the Submitted Plan
Soundness is assessed against the plan as submitted, the applicable national policy and the evidence supporting its strategy and allocations.
Confirm whether the plan is a legacy plan or a new-style plan. This determines the regulations, procedure guide and soundness language. Quoting the wrong framework can undermine an otherwise valid point and makes it harder for the Inspector to understand the remedy sought.
Read the plan as a whole. A single site allocation may depend on the housing requirement, settlement hierarchy, infrastructure strategy, Green Belt release, trajectory and sustainability appraisal. The objection should explain the relationship between the site-specific problem and the plan-wide consequence.
Evidence should be proportionate but traceable. Cite the council’s documents, data tables, consultation reports, technical studies and statements of common ground. Where specialist evidence is disputed, provide a clear alternative analysis rather than an unsupported conclusion.
The Inspector is not choosing the promoter’s ideal plan. The question is whether the submitted plan satisfies the applicable tests. Frame the case around a defect that must be corrected for the plan to be adopted, not merely a request for discretionary improvement.
Finally, identify the modification. This may be amended policy wording, an adjusted trajectory, additional evidence, deletion or replacement of an undeliverable allocation, a new reserve mechanism or, where justified and procedurally fair, a new site allocation.
Unsoundness is a conclusion reached through a chain of evidence and reasoning. Show the broken link and the change required to repair it.
Soundness Audit
Six Stages in Building a Soundness Case
Move from the applicable legal framework to the evidence, consequence and remedy in a disciplined sequence.
Identify the Regime
Confirm the 2012 legacy or 2026 new-system procedure and the NPPF version governing examination.
Define the Test
Select the soundness limb or legal requirement actually engaged by the issue.
Trace the Evidence
Identify what the council relied on and whether material evidence or alternatives were omitted.
Prove the Defect
Show inconsistency, unsupported assumptions, delivery failure, unmet need or lack of conformity.
Explain the Consequence
Demonstrate how the defect affects the strategy, trajectory, allocation portfolio or policy effectiveness.
Propose the Remedy
Set out a precise, lawful and deliverable modification capable of making the plan sound.
2026 Tests
What the New Soundness Tests Mean in Practice
For plans prepared under the 2026 system, the NPPF separates five tests. Each requires a distinct evidential question.
Positive asks whether the plan takes a positive approach to growth and meets development needs in accordance with national policy, supported by effective cross-boundary working. An authority relying on an unexplained unmet need or an incomplete cooperation process may fail this test.
Appropriate asks whether the chosen strategy enables sustainable development, takes account of reasonable alternatives and is based on proportionate evidence. This is often central to site-selection and sustainability appraisal challenges.
Effective concerns whether policies work and whether site allocations have a reasonable prospect of being deliverable at the time envisaged. Ownership, infrastructure, viability, lead-in and unresolved constraints are relevant where they materially affect delivery.
Consistent with national policy asks whether plan-making policy has been followed and whether local policies duplicate, restate or conflict with national decision-making policies. Conformity addresses general conformity with an adopted spatial development strategy where one applies.
Positive
Needs, growth and cross-boundary working.
Appropriate
Reasonable alternatives and proportionate evidence.
Effective
Working policies and deliverable allocations.
National Policy
Consistency with current plan-making requirements.
Conformity
Alignment with an adopted spatial development strategy.
Proportionality
Application of the tests must reflect the policy and issue concerned.
Legacy plans may be examined under earlier soundness wording. Use the framework identified for that examination rather than assuming the five-test structure applies.
Evidence of Unsoundness
The Types of Defect That Can Support an Objection
The most persuasive cases expose a material gap between the plan’s conclusion and the evidence needed to support it.
A need or supply defect may arise where the plan does not provide for the applicable housing or employment requirement, relies on unsupported assumptions or fails to address unmet cross-boundary needs. Quantify the shortfall and distinguish the requirement from optional contingency.
A strategy defect may arise where the settlement hierarchy, distribution of growth or Green Belt approach does not follow from the evidence or fails to consider reasonable alternatives. Show how the preferred strategy was selected and why the explanation is inadequate.
A delivery defect may arise where major allocations depend on land control, infrastructure, funding, viability or timescales that have not been demonstrated. Use current evidence and distinguish a manageable risk from a fundamental failure.
A consistency defect can arise where sites are evaluated using different assumptions or where the methodology is changed without explanation. The case should compare materially similar circumstances and explain why the differential treatment affects the plan outcome.
- Unmet or incorrectly calculated development need
- Insufficient, overstated or poorly phased supply
- Unexplained settlement or spatial strategy choice
- Failure to assess reasonable alternatives consistently
- Undeliverable allocation or infrastructure dependency
- Unsupported viability or build-out assumptions
- Conflict with applicable national plan-making policy
- Lack of conformity with a relevant spatial strategy
Site-Promotion Context
How an Omitted Site Can Form Part of a Soundness Remedy
The site should be presented as a solution to the identified plan defect, not as an unrelated alternative seeking inclusion.
First establish the defect without relying on the promoted site. For example, show that the housing trajectory is not robust, a selected allocation is not deliverable or the sustainability appraisal failed to assess a reasonable alternative. Then explain how the site addresses the consequence.
Demonstrate that the remedy is procedurally capable of being considered. A new allocation may require updated sustainability appraisal, habitats assessment, consultation, evidence and policy wording. A reserve-site mechanism or adjusted phasing may sometimes be a more proportionate remedy.
Provide sufficient site evidence to show suitability, availability and achievability. The Inspector cannot assume that replacement land will deliver merely because the existing portfolio is defective. Address access, capacity, constraints, infrastructure, ownership, viability and timing.
Avoid overclaiming. If the site can provide 80 homes, do not present it as the complete answer to a 500-home shortfall. Explain its precise contribution and how it complements other necessary changes.
Defect First
Prove the plan problem independently.
Site as Remedy
Explain the contribution the land can make.
Procedural Fairness
Identify appraisal and consultation needed.
Delivery Evidence
Demonstrate a realistic capacity and programme.
Policy Wording
Provide a draft allocation or reserve mechanism.
Plan-Wide Fit
Show compatibility with infrastructure and spatial objectives.
Examination Strategy
From Written Representation to Hearing and Main Modifications
An examination case should remain focused on the Inspector’s matters, issues and questions and the modification necessary for soundness.
The written representation should identify the core case and requested remedy. At hearing, answer the Inspector’s question directly, refer to the evidence and avoid repeating the entire site promotion history. Coordinate statements where several landowners or consultants advance related points.
Monitor the examination library for initial questions, council responses, statements of common ground, updated trajectories and notes. New information can confirm or narrow the objection. Ask the Programme Officer about procedure rather than contacting the Inspector directly.
Main modifications are changes necessary to make the plan sound or legally compliant. They are not a general opportunity to renegotiate every policy. Any proposed new allocation or substantial boundary change must be linked to the Inspector’s identified concern and supported by the required assessment and consultation.
If the defect cannot be remedied without fundamentally rewriting the plan, withdrawal or a finding of unsoundness may follow. A landowner should be realistic about whether the desired site change is a necessary cure or an option for the next plan.
- Duly made representation and examination reference
- Inspector’s matters, issues and questions
- Concise hearing statement and evidence references
- Clear proposed main modification
- Sustainability appraisal and consultation implications
- Fallback position if immediate allocation is not necessary
Evidence Chain
Connect the Identified Defect to a Necessary and Workable Plan Change
A soundness objection should move through four linked propositions: what the plan says, why the evidence does not support it, why that matters and how the defect can be remedied.
Quote the relevant policy, allocation, omission, trajectory or supporting text and identify the version examined. Then identify the evidence the authority relies upon. A disagreement with the outcome is not enough; the representation should show that the evidence is absent, materially outdated, internally inconsistent, applied irrationally or incapable of supporting the stated conclusion under the applicable soundness test.
Explain materiality. A minor scoring error may not affect the spatial strategy, while an overstated allocation capacity may create a housing shortfall, infrastructure gap or unrealistic trajectory. Quantify the effect where possible and distinguish a defect that can be corrected by wording from one that changes the distribution or amount of development.
Apply the correct test. New-system plans under the August 2026 Framework use the current five tests; legacy plans can be governed by the earlier Framework under transitional provisions. State which regime applies and why. Avoid mixing language from different versions because it allows the authority to dismiss an otherwise valid point as procedurally confused.
Propose a remedy proportionate to the defect. This may be revised policy wording, a reduced or increased allocation capacity, additional infrastructure requirement, reserve-site mechanism, altered trajectory or inclusion of a reasonable alternative. Explain the sustainability appraisal, consultation and evidence needed for the change rather than assuming a new site can simply be inserted.
Demonstrate that the remedy works. For an omitted site, provide evidence of suitability, availability, achievability, infrastructure and delivery timing. For a policy objection, show how the replacement wording operates in decisions and aligns with other policies. The Inspector needs a route to a sound plan, not only a criticism of the submitted one.
Plan Proposition
Identify the exact policy, map, allocation, trajectory or omission challenged.
Evidence Defect
Show the missing, inconsistent, outdated or unsupported reasoning.
Soundness Test
Apply the correct test and transitional framework to the identified defect.
Material Consequence
Explain the effect on housing, strategy, infrastructure, delivery or decision-making.
Necessary Remedy
Draft a proportionate modification linked directly to the defect.
Evidence of Workability
Show that the proposed cure can be appraised, consulted upon and delivered.
The strongest structure can often be summarised in one sentence: because the evidence does not support X, the plan fails test Y, causing consequence Z, which should be remedied by modification A.
Avoiding Weak Objections
Common Arguments That Sound Forceful but Do Not Establish Unsoundness
Inspectors distinguish strongly held preferences from evidence-based defects. Removing common weaknesses makes the core case easier to examine.
Do not say that a plan is unsound merely because the council did not select the landowner’s preferred site. Authorities can choose between reasonable strategies. The objection must show why the selected approach is not supported, appropriate, effective, consistent or otherwise sound under the applicable framework, and why the omitted site is relevant to the remedy.
Avoid treating a HELAA finding as an allocation decision or a high sustainability score as an entitlement to selection. The evidence bases perform different roles. Explain how they interact and where the plan-making judgement departs from them without adequate reasons. A technically accurate description of the process improves the credibility of the challenge.
Do not rely solely on new material that could have been provided earlier without explaining its significance and timing. Examination is not intended to repeat plan preparation. Updated evidence can be important, especially where circumstances changed, but it should answer an existing soundness issue and be introduced in accordance with the Inspector’s directions.
Avoid alleging predetermination, bias or unlawful conduct without a proper evidential and legal basis. A council may prefer its own land or a strategic partner’s site for stated delivery reasons. Test whether the same methodology and scrutiny were applied. Unsupported allegations can distract from a stronger comparative and soundness case.
Do not request a modification that creates a new inconsistency elsewhere. Adding a site may alter the settlement hierarchy, infrastructure plan, Green Belt boundary, habitats assessment, housing trajectory or policy map. Anticipate those consequences and show how the package can remain coherent and deliverable.
Preference Only
“My site is better” does not identify a soundness failure or necessary remedy.
Wrong Test
Using superseded soundness language can obscure the issue and transitional position.
Score Entitlement
An assessment score informs judgement but rarely dictates allocation by itself.
Unparticularised Allegation
Claims of inconsistency need comparable evidence and a material consequence.
Unworkable Modification
A requested change must fit appraisal, infrastructure and the wider plan strategy.
Late Case Expansion
New arguments should remain connected to the submitted representation and examination fairness.
Firm language is appropriate where the evidence warrants it, but precision is more persuasive than accusation. State the defect, source, consequence and cure.
One-Page Case Summary
Prepare a Soundness Schedule That Can Be Understood at a Glance
A short schedule helps the council and Inspector see how the evidence, test and requested modification connect before they read the supporting detail.
Use one row for each objection. Identify the plan provision, applicable soundness test, evidence defect, material consequence, modification sought and supporting document. Keep separate objections separate; combining housing need, site selection, infrastructure and sustainability appraisal in one broad allegation makes it difficult to determine what finding is requested.
Add the council’s response and your concise reply as the plan progresses. This reveals whether the authority has accepted a factual correction, relied on new evidence or answered a different point. It also prevents a hearing statement from repeating issues that have already been resolved while omitting the remaining defect.
Review the schedule against the complete plan. A modification that cures one policy may require consequential wording, map, trajectory or monitoring changes. Record those connections so the proposed remedy is internally coherent and does not create a fresh inconsistency elsewhere.
- Plan paragraph, policy, allocation or omission
- Applicable soundness or legal-compliance test
- Evidence relied upon and identified defect
- Material consequence for the plan strategy
- Exact modification and consequential changes
- Supporting document and paragraph reference
The schedule should summarise the case rather than replace the representation. Its purpose is to make the reasoning and remedy transparent.
How Value My Land Can Help
Convert Site Evidence Into a Clear Soundness Case
Value My Land can identify the applicable soundness framework, trace the council’s evidence and separate a material plan defect from a general disagreement.
We can help present an omitted or alternative site as a deliverable remedy, with a precise policy or mapping change and proportionate technical evidence.
We can also help landowners prepare for examination questions and assess whether a proposed main modification creates a realistic opportunity.
Our Initial Review Can Include
- Identification of the correct soundness tests and transition rules
- Audit of housing, strategy, site-selection and delivery evidence
- Comparison of selected and omitted sites
- Drafting of the defect, consequence and remedy
- Coordination of site evidence and proposed policy wording
- Examination and main-modification strategy
Official Planning and Legal Sources
The following official sources provide the current statutory or policy context. Always check the version and transition arrangements that apply to the particular council, plan or application.
August 2026 National Policy
Final August 2026 Policy Check: How to Demonstrate That a Local Plan Is Unsound
This guide has been checked against the National Planning Policy Framework published on 17 August 2026. The final wording, rather than the earlier consultation draft, should be used for decisions and for plans governed by the new framework.
Final Framework Published
The August 2026 NPPF replaced the December 2024 version for national decision-making from publication. References to proposals in the consultation are not treated as policy unless carried into the final text.
Transition Still Matters for Plans
Annex A distinguishes new-system plans and spatial development strategies from legacy plans that may continue under the earlier framework. The council’s legal route should be confirmed.
Use the Final Policy Code and Definition
Policy codes, definitions, qualifying thresholds and cumulative tests should be quoted from the published framework and its annexes, not an earlier draft or summary.
Keep Evidence and Dates Current
Housing, transport, plan-stage and site-assessment evidence can change after publication. Current council documents and monitoring data should be checked before submission.
The page explains national policy and does not replace a current review of the development plan, council evidence and site-specific constraints. Any historical December 2024 reference is retained only where it explains a legacy or transitional route.
Read the National Planning Policy Framework published on 17 August 2026.
Related Guides
These pages address the neighbouring issues without duplicating the specific problem covered by this guide.
Regulation 18 and 19 Representations
Understand when and how the soundness case should be submitted.
Read guideWhat Happens at a Local Plan Examination?
Follow the objection through hearing and report stages.
Read guideMain Modifications and New Site Opportunities
Assess the remedy stage after soundness concerns emerge.
Read guideSustainability Appraisal and Reasonable Alternatives
Test whether the preferred strategy was selected lawfully and appropriately.
Read guideLocal Plan Site-Selection Methodologies
Audit the evidence process behind allocation choices.
Read guideHow Councils Compare Competing Sites
Build an evidence-led comparison with selected land.
Read guideSite Discounted From Local Plan Allocation
Apply the soundness framework to an omitted site.
Read guidePlanning Policy and Development Land
Review the wider relationship between national and local policy.
Read guideEngland Local Plan Tracker
Monitor publication, submission and examination stages.
Read guideFrequently Asked Questions About Local Plan Soundness
What does it mean for a Local Plan to be unsound?
It means the submitted plan fails one or more of the soundness tests applicable to that plan. The tests depend on the plan-making system and NPPF transition. Unsoundness is different from a landowner simply preferring another strategy or site.
What are the August 2026 soundness tests?
For relevant new-system local plans they are Positive, Appropriate, Effective, Consistent with national policy and Conformity. The last test applies in relation to an adopted spatial development strategy. The tests are applied proportionately.
Do those five tests apply to every current examination?
No. Legacy plans may remain governed by the December 2024 NPPF and its transitional arrangements, which use the earlier soundness formulation. Check the examination documents and applicable framework before drafting.
Can a single undeliverable allocation make the whole plan unsound?
Potentially, if the site is material to the strategy or trajectory and the problem cannot be addressed through phasing, replacement supply or modification. A minor delivery risk in a plan with sufficient contingency may not have the same consequence.
Is disagreement with sustainability appraisal enough?
No. Explain the legal or soundness defect: unreasonable exclusion of an alternative, inconsistent assumptions, failure to assess likely significant effects or an unexplained choice. The authority can lawfully prefer another option if the appraisal and reasoning are adequate.
Must I propose a modification?
A clear remedy materially strengthens the representation. Explain the policy, allocation, trajectory or map change needed. The Inspector’s role is to assess soundness and, where requested, recommend necessary main modifications—not to design an entirely new plan without assistance.
Can my site be the remedy?
Yes where it responds to the proven defect and is supported by evidence of suitability, availability, achievability and procedural fairness. Immediate allocation is not automatic; appraisal and consultation may be required.
What evidence proves lack of effectiveness?
Evidence may include unresolved ownership, missing access rights, unfunded infrastructure, unrealistic lead-in or build-out, viability gaps, dependence on another project or technical constraints that prevent delivery at the time assumed.
Should I ask to speak at the examination?
Ask where oral participation would help resolve a main issue. Written representations are considered, but a hearing can be valuable for complex strategy, delivery and alternative-site evidence. Follow the Programme Officer’s directions.
Can Value My Land review an existing representation?
Yes. We can check whether it uses the correct framework, identifies a material defect, cites the evidence, explains the plan-wide consequence and proposes a realistic remedy.
Does the Submitted Local Plan Properly Address Your Site?
Send us the representation, site evidence and relevant plan documents. We can review whether the issue supports a focused soundness case and what modification should be requested.
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