Main modifications at a local plan examination

A main modification is a change to a submitted local plan that the examining inspector considers necessary to make the plan sound or legally compliant, and the inspector can only recommend one if the council has asked for it. That request, made under section 20(7C) of the Planning and Compulsory Purchase Act 2004, is what puts main modifications local plan changes into the inspector's hands. Once the report arrives the council either adopts the plan with those changes or does not adopt it at all. There is no third route where the authority keeps the modifications it likes and drops the rest.

Consultants who pick up an examination after the hearings often misread this. The schedule of main modifications is not a negotiating position. It is the price of a sound plan, and the council set that price itself when it made the request.

Main and additional modifications do different jobs

Two sets of changes come out of an examination, and they travel by different routes.

Main modifications go to soundness or legal compliance. They change what a policy requires, add or delete a site allocation, alter a housing requirement figure, or repair wording that would leave a policy ineffective in practice. The inspector recommends them and lists them in a schedule appended to the report.

Additional modifications, which most councils call minor modifications, are the authority's own tidying. Typographical corrections, paragraph renumbering, updated evidence references, a clearer sentence that leaves the policy's effect untouched. Section 23(3) of the 2004 Act allows the council to make those on adoption without any recommendation, so long as they do not materially affect the policies.

The boundary between the two is where most arguments sit. A change presented as minor that moves a settlement boundary by 40 metres, or turns "should" into "will", is doing policy work and belongs in the main schedule. If a council tries to shift something across that line, object in writing during the modifications consultation and explain the practical consequence for decision-taking rather than complaining about procedure alone.

Only the council can ask for them

The inspector recommends main modifications only if the local planning authority requests it. Most councils make that request in the submission letter as routine, and the request is normally open-ended rather than limited to particular policies.

Without the request, an inspector who finds the plan unsound has one option: recommend non-adoption. That outcome wastes years of plan-making, which is why the request is almost always made. It also means the inspector's hands are tied in the other direction. Where the authority has asked for modifications, the inspector cannot simply approve a plan that falls short and leave the gaps for a future review.

A related point catches out promoters. The inspector can recommend modifications that no party proposed. Hearing discussion that exposes a problem in a policy the authority thought settled can produce a modification nobody asked for, so attending sessions on policies you did not make representations about is often worthwhile. Testing your plan against the soundness tests before the hearings, covered in our note on soundness at a local plan examination, is the surest way to predict where those modifications will land.

Consultation and sustainability appraisal

Main modifications have to be published for representations before adoption. Six weeks is the normal period, and the council publishes the schedule alongside any updated sustainability appraisal and habitats regulations assessment work.

That appraisal step is the one councils underestimate. Where a modification introduces a new allocation, increases the yield on an existing one, or removes a policy that carried mitigation, the strategic environmental assessment has to be revisited under the Environmental Assessment of Plans and Programmes Regulations 2004. Publishing an addendum late, or not at all, is a legal compliance problem rather than a presentational one, and it has grounded successful challenges to adopted plans.

Representations at this stage are considered by the inspector, not by the council's planning committee. They must address the modifications themselves. A representation that reopens an objection to a policy left unchanged will be set aside, however well argued.

What the inspector's report does and does not settle

The report says whether the plan, with the recommended main modifications, satisfies the legal requirements and is sound. Both the report and the schedule are binding in the sense that adoption under section 23(3) has to include the main modifications as recommended.

What the report does not do is fix the meaning of a policy for all time. An inspector's reasoning on a modification is a strong indication of intent, and decision-makers read it, but the adopted policy wording governs. Where a modification leaves genuine ambiguity, expect that ambiguity to be argued at appeal within a year.

The report also carries no weight against a different plan. Reasoning about a green gap policy in one district tells you how one inspector approached one evidence base, so use it as an argument rather than as authority.

Effect on sites, policies and the weight they carry

For a landowner or promoter, the practical question is what happens to your site during the modifications window.

Applications already in the system are decided against the development plan as it stands at the time of the decision, so a plan that is adopted mid-determination changes the policy basis of a live application. Where the modification is adverse, a case officer will normally invite an amended Planning Statement addressing the new wording rather than refusing outright. Where the modification introduces an affordable housing requirement that did not previously apply, an Affordable Housing Statement will be added to the validation list for later applications.

How they delay adoption, and by how much

Main modifications add time. The schedule has to be drafted, the appraisal addendum prepared, the consultation run for six weeks, the responses passed to the inspector, and the final report written. Councils commonly allow several months between the close of hearings and adoption for exactly this, and complex plans with many modifications take longer.

Two things extend that further. Where the inspector suspends the examination for further evidence, such as a revised housing land supply position or new highway modelling, the modifications consultation happens after the suspension lifts. And where the consultation responses raise a point the inspector accepts, a second round of consultation on revised modifications follows.

Anyone relying on plan adoption for a development timetable should treat the council's published timetable as an intention rather than a commitment, and watch the examination library for the inspector's post-hearing letters instead. Those letters usually signal the shape of the modifications months before the schedule appears.

Making representations that actually get read

The representations that change modifications share a pattern. They identify the specific words in the specific modification, explain why those words fail one of the soundness tests, and offer alternative wording the inspector could adopt.

1. Quote the modification number and the text you object to, without summarising it in your own words.
2. Name the soundness test engaged, and say why the modification fails it on the evidence in the examination library.
3. Point to the document and page in that library that supports your position.
4. Offer replacement wording that is capable of being recommended as it stands.
5. Say what the modification would mean for a real decision, such as an application that could not be determined consistently under the new wording.

Short submissions do better. An inspector working through several hundred representations on twenty modifications will find a two-page letter with precise wording more useful than a forty-page critique of the plan. Leave the plan's strategy alone at this stage. That argument is over.

Where a modification reshapes the evidence you need for a forthcoming application, checking which documents the new policies will require is quicker than waiting for the validation list to catch up, and the full list of planning report types is a reasonable starting point for that exercise.

This is general guidance, not legal advice. Check the position with your local planning authority or a qualified professional before relying on it.