Reserved matters: what outline permission leaves open

Reserved matters planning is the second half of a two-stage consent. An outline permission establishes that development of a described kind is acceptable in principle on that land. The reserved matters application then settles the detail that was deliberately left out, and it can only be refused on the matters actually reserved. The principle is fixed. Arguing it again at reserved matters stage is not open to the council, and expecting to reopen it is not open to the applicant either.

Developers use the route to de-risk land before spending on detailed design. That works, provided the parameters set at outline stage leave room for the scheme you eventually want to build.

The five reserved matters and what each covers

The Development Management Procedure Order 2015 defines them:

• Access: the accessibility of the site for vehicles and pedestrians, and the position and design of the access points onto the surrounding network.
• Appearance: the aspects of a building or place that determine its visual impression, including materials, fenestration and detailing.
• Landscaping: the treatment of land for amenity purposes, including planting, screening, hard surfaces and boundary treatment.
• Layout: the way buildings, routes and open spaces are arranged on the site and in relation to what is outside it.
• Scale: the height, width and length of each building proposed.

An outline application can reserve all five or any combination. Reserving access is unusual on constrained sites, because the highway authority normally wants the access resolved before the principle is settled, and an applicant who has agreed the access at outline stage has removed the most common late objection.

How outline permission and reserved matters fit together

The outline permission carries conditions, and those conditions bind everything that follows. Some are discharged before development begins, some sit alongside the reserved matters submission, and some apply for the life of the development.

A reserved matters submission is an application for approval of details, not a fresh planning application. That distinction has consequences. The description of development cannot change. The site area cannot grow. The number of dwellings cannot exceed what the outline permitted, and where the outline was for "up to" a number, fewer is acceptable and more is not.

Where the scheme has moved beyond what the outline allows, the options are a section 73 application to vary a condition, a fresh planning application, or a redesign back inside the envelope. Working out which one you need before submitting saves a refusal.

Parameter plans and the limits they set

Where scale is reserved, the outline application must state the upper and lower limits for the height, width and length of each building. Most schemes of any size go further and submit parameter plans that fix development zones, maximum building heights by zone, the primary movement network, and the areas of open space.

Parameter plans are the developer's own cage. Draw them tight to win the outline and the detailed scheme will not fit. Draw them loose and the officer will resist, because a plan that permits anything assesses nothing.

The practical compromise is to fix what the impact assessments depend on, whether that is a maximum ridge height along a sensitive boundary or a set-back from a watercourse, and to leave the internal arrangement flexible. Where an environmental impact assessment was carried out, the parameters also define the envelope that was assessed, and departing from them can trigger a further assessment.

Read the parameter plans against the illustrative masterplan before the outline is submitted. The illustrative plan is not approved and carries no weight of its own, but officers and members remember it, and a reserved matters scheme that bears no resemblance to the picture used to sell the outline attracts objections that have nothing to do with policy. Where the two documents will inevitably diverge, say so in the outline design and access statement and explain which elements are fixed.

Time limits for submitting reserved matters

Section 92 of the Town and Country Planning Act 1990 sets the default: the application for approval of reserved matters must be made not later than three years from the date of the outline permission, and the development must begin not later than two years from the final approval of the last reserved matter, or three years from the outline permission, whichever is later. Councils can and do impose different periods by condition, so read the decision notice rather than assuming the default.

Two traps recur. A reserved matters application submitted on the last day of the three years is fine, but one submitted a day late is invalid and the outline permission is lost. And where the outline covered a phased scheme, the wording of the condition determines whether each phase gets its own clock or whether all phases hang off the same deadline.

Where a permission is about to expire and the detailed design is not ready, submitting a partial or minimal reserved matters application to keep it alive is a recognised tactic. It is also one the officer will see coming, so make sure what you submit is capable of approval.

When a reserved matters submission is refused

Refusal happens on three grounds in practice. The details conflict with a parameter plan or a condition on the outline. The details are unacceptable on one of the reserved matters themselves, most often layout or appearance. Or the submission is incomplete, in which case it fails validation rather than being refused.

The right of appeal exists in the ordinary way, and the appeal is confined to the reserved matters. An inspector cannot revisit the principle either.

Refusals on appearance are the most avoidable. Where the outline was granted against a design code or a design and access statement that described a character, the design and access statement at reserved matters stage needs to show the line of descent from that document to the drawings, elevation by elevation.

Evidence usually required at reserved matters stage

The submission is a drawing package plus the supporting documents the conditions and the local validation list require. Expect most of the following:

1. Detailed site layout, floor plans, elevations and sections, with levels.
2. A materials schedule and, on larger schemes, sample panels secured by condition.
3. A landscape strategy with a planting schedule, hard surfaces, boundary treatments and a management plan.
4. Detailed drainage design and calculations for the lead local flood authority.
5. Refuse and cycle storage, external lighting and boundary details.
6. Ecology deliverables, including the biodiversity gain plan where the biodiversity gain condition applies, which on outline permissions can operate in phases.
7. An updated statement showing compliance with each parameter plan.

Money matters at this stage too. The fee for a reserved matters application is set in the national fee regulations and is indexed annually, so take the current figure from the published schedule. And because Community Infrastructure Levy liability crystallises on commencement, the levy calculation follows the floorspace approved at reserved matters, not the outline description, which can produce an unwelcome surprise on a scheme that grew within its parameters.

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

Browse the report types on PlanScope to see which supporting documents a reserved matters submission usually needs. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.