Outline permission and reserved matters: the sequence

An outline permission fixes the principle of development and defers the detail. The detail is the five reserved matters defined in article 2 of the Town and Country Planning (Development Management Procedure) (England) Order 2015: access, appearance, landscaping, layout and scale. Everything else, including the amount of development, the use and the conditions, is settled at outline and cannot be reopened when the reserved matters come in.

That is the whole trick of the outline and reserved matters sequence, and it cuts both ways. You keep design flexibility for three years. You also lose the ability to argue about unit numbers, access points or conditions without going back for a section 73 or a fresh application.

What can be reserved and what must be settled

Only those five matters can be reserved. Access covers the accessibility of the site for vehicles and pedestrians and the position and nature of the connections to the highway network. Appearance is the visual treatment of the building. Landscaping covers the treatment of the land, including planting and boundary treatment. Layout is the way buildings, routes and open spaces are positioned in relation to each other and to the site boundary. Scale is the height, width and length of each building.

Outside that list, the application has to be specific. The description of development, the quantum of floorspace or the number of dwellings, the use classes proposed, and the extent of the red line all form part of the permission. If the description says "up to 120 dwellings", 121 is a different development.

One provision catches applicants regularly. Article 5 of the 2015 Order lets the local planning authority notify you, within one month of receiving an outline application, that it needs further details of a reserved matter before it can determine the application. Highway authorities commonly trigger this on access. So reserving access on a site with a constrained frontage tends to produce a request for the very detail you were trying to defer, and a month lost.

Parameter plans and how binding they are

Parameter plans have no statutory status. They bind only to the extent that they are listed as approved drawings on the decision notice or tied in by condition, which is why the drafting of that condition matters more than the drawings themselves.

A workable set for a larger site usually covers development zones with maximum and minimum extents, maximum building heights expressed in metres above ordnance datum as well as in storeys, access and primary route locations, land use disposition, and the areas of open space and green infrastructure. Express the parameters as ranges with stated tolerances. A single fixed figure will be treated as fixed.

Two drafting points worth arguing at outline. Ask for heights in metres AOD alongside storey counts, because a floor-to-floor change at detailed design should not breach the parameter. And ask for a tolerance clause, typically a stated percentage or a set number of metres, so a minor coordinate shift at layout stage does not require a section 73.

Where an outline permission carries a design code, the code sits alongside the parameter plans and is usually approved by condition. Reserved matters are then assessed against both, and a departure from the code is as fatal as a departure from the parameters.

Time limits for submitting reserved matters

Section 92 of the Town and Country Planning Act 1990 sets the default. An application for approval of reserved matters must be made within three years of the date of the outline permission, and the development must be begun within two years of the final approval of the last reserved matter. The authority can substitute different periods by condition, so read the decision notice rather than relying on the default.

Those two limits behave differently. The three-year limit is about the date the application is made, so a reserved matters application submitted on the last valid day keeps the permission alive even though it will be determined later. The two-year limit runs from the final approval, and "final approval" means the last of the reserved matters to be approved rather than the first.

Missing the three-year deadline kills the outline permission outright. There is no extension mechanism, and a fresh application has to be made against whatever policy applies at that point, which after a local plan adoption can be a very different test.

Where a scheme is at risk of the deadline, a reserved matters application for a single phase, or even a single matter where the condition permits it, preserves the permission. Validation still has to be achieved, so a submission on day one thousand and ninety-five with an incomplete pack is a real risk.

Submitting reserved matters in phases

Phasing is normal on large sites and depends entirely on the wording of the outline conditions. A condition drafted as "details of the reserved matters shall be submitted for each phase" allows successive applications. One drafted as "an application for approval of all reserved matters shall be submitted" does not.

So agree a phasing condition at outline. The version that works names the mechanism for approving a phasing plan, allows reserved matters to be submitted phase by phase, and keeps each phase's approval independent so a delay on phase three does not stall phase one.

Then watch the interaction with the time limit. Unless the condition says otherwise, every reserved matters application still has to be made inside the three-year window, which on a fifteen-year site is the constraint that forces a section 73 or a second outline permission later. Negotiate a longer period at outline where the site is long-term by design. Authorities will sometimes grant five or ten years for a strategic allocation.

The other phasing question is infrastructure. Trigger points in the section 106 agreement, the drainage strategy and the spine road delivery all need to line up with the phase boundaries, and a compliance file kept from the date of permission is what makes discharge of conditions manageable three years later.

Conditions attached at outline and their effect

Conditions imposed at outline attach to the whole permission and survive into every phase. A reserved matters approval cannot vary them. If the outline carries a condition requiring 30 per cent of dwellings to have two parking spaces and your layout cannot deliver that, the route is a section 73 application to vary the condition, with its own fee, consultation and decision period.

Pre-commencement conditions deserve particular attention at outline, because a condition that says "no development shall take place until" can be triggered by site clearance. Since the changes made by the Neighbourhood Planning Act 2017, an authority generally has to obtain the applicant's written agreement before imposing a pre-commencement condition, which gives you a negotiating position at the point the officer drafts them.

Community Infrastructure Levy liability sits with the outline permission but is calculated at the point of the reserved matters approval that permits development to begin, so the liability notice and the assumption of liability both need handling at that stage. The detail is set out under CIL liability notices, assumption and the surcharges.

When an outline permission is worth more than a full one

Outline is the right instrument in four situations. Where the land is being sold and the buyer will design the scheme. Where funding depends on demonstrating that the principle is established before detailed design spend. Where a site is being promoted into a local plan and a permission supports the five-year housing land supply position. And where the market is likely to move before delivery, so fixing appearance now would only mean a later section 73.

A full permission is better where the scheme is small, where the design is the argument you need to win, or where the buyer wants certainty on exactly what can be built. On a single plot, the cost of running two application stages rarely pays for itself, and a planning statement with a full set of drawings gets you a better outcome in one pass.

Why reserved matters applications get refused

The refusals cluster in predictable places.

• The layout departs from the approved parameter plans, often by a few metres at a development zone edge, with no tolerance clause to absorb it.
• The scheme exceeds the quantum in the description of development, so it is not a reserved matters application at all.
• The design conflicts with an approved design code.
• Access arrangements differ from the approved access drawing, which was frequently fixed at outline at the highway authority's insistence.
• Landscaping fails to deliver the mitigation relied on in the landscape and visual assessment at outline.
• The drainage layout cannot accommodate the attenuation volumes in the approved strategy.

Most of these are avoidable at outline by drafting the conditions and parameters with the detailed design in mind. The rest are avoidable by testing a draft layout against the parameters before the appearance work starts. What a reserved matters submission cannot do is revisit the principle, and an officer who receives one that tries will refuse it rather than negotiate. Read what an outline permission leaves open alongside your decision notice.

A strong design and access statement at reserved matters stage should trace each element back to the outline parameters and the design code, clause by clause. That is the document the case officer uses to justify approval.

PlanScope drafts the supporting statements for both stages from your postcode and a short set of answers, structured to UK planning policy. Enter your postcode to see which reports your site is likely to need.

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