Reserved matters: the five and what they cover

The reserved matters meaning is set by the Town and Country Planning (Development Management Procedure) (England) Order 2015, and there are five: access, appearance, landscaping, layout and scale. An outline planning permission settles the principle of development and reserves some or all of those five for later approval. Get the boundary between them wrong and you either submit an outline application that is too vague to determine, or a reserved matters application that tries to change something the outline already fixed.

For a self-builder, the practical question is usually simpler than the definitions suggest. What did the outline actually decide, and what is still open?

What an outline permission does and does not settle

An outline permission establishes that development of the described kind is acceptable in principle on that land. The description of development on the decision notice is the thing that binds. If it says "erection of up to four dwellings", then four is the ceiling and dwellings is the use.

It also fixes anything that was not reserved. Where access was determined at outline stage, the position and form of the access is settled and a reserved matters application cannot move it. Where a parameter plan setting maximum heights was approved, that envelope binds.

The outline application itself cannot be silent on everything. The Development Management Procedure Order requires an outline application to state the use or uses proposed, the amount of development for each use, and, where layout is reserved, the approximate location of buildings and routes, along with upper and lower limits for height, width and length of each building where scale is reserved. So even a fully outline application carries indicative information, and that information shapes what a reasonable reserved matters submission looks like.

What an outline does not settle is whether the detailed scheme is acceptable. A reserved matters application can be refused on its own merits, and refusal of reserved matters does not take away the outline permission.

Access, appearance, landscaping, layout and scale

The definitions repay reading, because the boundaries between them are not intuitive.

Two overlaps cause most arguments. Access and layout meet at the point where a driveway becomes an internal route, and authorities differ on where they draw that line. Appearance and scale meet at roof form, where a change in pitch alters both how a building looks and how tall it is.

Where a matter has been reserved, everything within that definition is open. Where it has not, it is not. Read the outline decision notice and its conditions carefully before you assume either way.

Which matters can be reserved and which cannot

All five can be reserved, and a fully outline application reserves all of them. Applicants often fix access at outline stage because the highway authority's position is the main risk, and settling it early removes the chance that the scheme is unbuildable.

What cannot be reserved is the description of development. The use, and the amount of development described, are part of the grant. If you want five houses rather than four, that is a fresh application or a section 73 application, not a reserved matters submission.

Conditions on the outline are also not reserved matters, even though they are often submitted at the same time. A condition requiring a contaminated land investigation, a drainage scheme or an ecological mitigation plan is discharged through an application to discharge conditions, which is a separate procedure with a separate fee.

Outline permission is not available for householder development, and the route does not fit every project. For a single self-build plot, a full application is often quicker, because you go through one process instead of two.

Time limits for submission

Section 92 of the Town and Country Planning Act 1990 sets the default framework. An outline permission carries a condition requiring application for approval of reserved matters within three years of the grant, and requiring development to begin within two years of the final approval of the last reserved matter, or three years from the outline, whichever is later.

Those defaults can be varied by condition, and authorities sometimes impose shorter periods. Read the condition on your decision notice rather than assuming the statutory default.

Three points that catch self-builders out:

1. The deadline is for making the application, not for obtaining approval. An application submitted on the last valid day is in time even though it will be determined months later.
2. There is no general power to extend the period. The renewal procedure that once allowed an extension application was withdrawn, so a missed deadline means a fresh outline application on current policy.
3. Where reserved matters are approved in stages for different parts of a site, each approval has its own consequences for the commencement date, so keep a schedule.

If the three years is running out and the design is not ready, submitting a reserved matters application that you expect to refine through amendment is a legitimate tactic, though the authority is entitled to refuse an application that is not properly made.

Amending an outline through reserved matters

This is where applications go wrong. A reserved matters application that conflicts with the outline, its conditions or its approved parameter plans cannot be approved, because the authority has no power to grant something outside the terms of the permission.

Signs that you have drifted outside the outline: the unit count has changed, a building exceeds an approved height parameter, the access has moved, the red line has changed, or the mix of uses is different from the description.

The routes back are a section 73 application to vary the relevant condition, a section 96A non-material amendment for something genuinely trivial, or a fresh application. Take the decision early. Submitting reserved matters and hoping the officer does not notice wastes a validation period and a fee.

Conditions discharged alongside

Most outline permissions carry conditions that have to be discharged before development starts, and it is usually efficient to submit those alongside the reserved matters application.

The bundle typically includes surface water drainage details, a construction management plan, materials samples, boundary treatments, ecological mitigation and, since biodiversity net gain became mandatory, the biodiversity gain plan where the scheme is caught by the regime. Check which conditions are pre-commencement, because those set the critical path.

Submit them as separate applications with their own references, cross-referenced to each other. A single bundled submission is harder for the authority to process and often results in the whole package waiting for the slowest element.

Common reasons for refusal

Reserved matters applications are refused for a narrower set of reasons than full applications, and the pattern is consistent.

Scale and appearance that do not respond to the character established in the outline design and access statement. Layouts that put parking where the indicative plan showed open space, leaving the scheme short of amenity area. Landscaping submitted as a planting list with no plan, no specification and no maintenance period. Access details that the highway authority has not seen before submission. And a refusal that catches people by surprise: schemes where the drainage strategy approved at outline cannot be delivered within the detailed layout.

The fix for most of them is a pre-application conversation about the detailed design, using the outline as the agreed starting point. A Design and Access Statement that explains how the detailed scheme responds to what the outline established does more work here than any other document, and a proper Landscape Strategy answers the landscaping refusals before they happen. The weight the development plan carries at both stages is the same, as our note on section 38(6) and the development plan explains, so policy changes between outline and reserved matters can matter. Browse the 66 report types by category to see what a detailed submission on a constrained site usually needs.

This is general guidance, not legal advice. Check the position with your local planning authority or a qualified professional before relying on it. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.