Walkthrough: an outline application and reserved matters

An outline planning reserved matters strategy works when the parameter plans are drawn tightly enough to be defensible and loosely enough to be buildable. That balance is the whole exercise. This walkthrough follows an illustrative scheme: 84 dwellings on a 4.2 hectare edge-of-settlement site allocated in an adopted local plan, consented in outline with all matters except access reserved, and brought forward through a reserved matters application two years later.

The scheme and the figures are illustrative and do not describe a real applicant, site or authority. What is worth taking from it is the sequence, and the two decisions that constrained the detailed design more than anyone intended at the time.

Why outline was chosen

The site was allocated but not owned outright. The promoter had an option agreement conditional on planning permission, and the housebuilder who would ultimately build it was not yet appointed. A full application would have required a complete design, prepared for a purchaser who did not exist, at a cost the promoter was unwilling to carry.

Outline permission under the Development Management Procedure Order allows the principle of development to be established with details reserved for later approval. It suited the commercial position exactly: establish the principle, fix the section 106 package, sell the site with a permission attached.

The trade-off, paid two years later, is that the promoter set the parameters and the housebuilder had to live inside them.

What was applied for, and what was reserved

Access was applied for in detail, because the highway authority's position on the junction was the main planning risk and the promoter wanted it settled. Appearance, landscaping, layout and scale were reserved.

The outline application included:

1. A site location plan and an application plan showing the access arrangement in detail.
2. Parameter plans covering development zones, maximum building heights, the green infrastructure framework and the primary movement network.
3. An illustrative masterplan, clearly labelled as illustrative.
4. A Planning Statement setting out the policy case and the development quantum.
5. A Design and Access Statement explaining the design principles that the reserved matters would follow.
6. The technical evidence base, including transport, ecology, drainage, heritage and arboriculture.

The description of development fixed the quantum as up to 84 dwellings. That word up to did useful work later, because the housebuilder came back with 81.

Parameter plans and how tightly they were drawn

Parameter plans are approved drawings. Once the permission is granted they bind the reserved matters, and departing from them means a fresh application rather than an argument at reserved matters stage.

The scheme used four. A land use parameter plan showing the developable area and the areas to remain open. A building heights plan setting maximum heights by zone, expressed in storeys and in metres above ordnance datum. A green infrastructure plan showing retained hedgerows, the buffer to the watercourse and the location of public open space. And a movement plan showing the primary street alignment and the pedestrian and cycle connections.

Two of these were drawn too tightly, and it is worth naming which.

The building heights plan expressed maximum heights in metres above ordnance datum as well as in storeys. On a sloping site, that combination removed the flexibility to set floor levels to suit the final drainage design. The housebuilder spent three months on a levels strategy that would have taken three weeks against a storeys-only parameter.

The movement plan fixed the primary street alignment as a line rather than a corridor. A corridor with a stated width would have allowed the alignment to shift by a few metres to save a tree group, which is exactly what the arboriculturist later wanted.

The illustrative masterplan and its status

The illustrative masterplan was labelled illustrative and was not approved. Officers and members nonetheless discussed it at committee, and the minutes recorded expectations about the character of the frontage that had no formal status at all.

That is the normal position, and it is worth understanding rather than resenting. An illustrative masterplan shows that the parameters can accommodate a decent scheme. It is evidence that the quantum works, and nothing more. But the expectations it creates are real, and a reserved matters submission that looks nothing like it invites an argument the applicant will probably lose on presentation even where the parameters are met.

The practical lesson is to make the illustrative material honest. A masterplan drawn to flatter the scheme at outline stage becomes a stick at reserved matters stage.

The section 106 agreed at outline

The obligations were settled at outline, which is normal and sensible. The package covered affordable housing at the plan policy percentage with a tenure split, education contributions, open space and play provision with a maintenance arrangement, a travel plan with monitoring, and highway works secured through a separate agreement with the highway authority.

Two drafting points mattered later.

The affordable housing schedule was expressed as a percentage of the total units delivered rather than as a fixed number, so the reduction from 84 to 81 units flowed through without a deed of variation. The play space obligation, by contrast, was expressed as a fixed area in a fixed location shown on a plan, which removed the flexibility to relocate it when the layout changed.

Express obligations as formulas tied to what is delivered wherever you can. Fixed numbers and fixed plans age badly across a two year gap.

Reserved matters, two years later

The housebuilder submitted appearance, landscaping, layout and scale in a single reserved matters application. The submission included the detailed site layout, house type drawings, a materials schedule, a landscape scheme with a planting specification, a levels strategy, and an updated ecology position because the original surveys were by then out of date.

That last point catches schemes routinely. Ecological survey data has a shelf life, and an authority is entitled to ask for updated survey work where the baseline has aged, particularly where the Preliminary Ecological Appraisal was carried out outside the optimal season or several years earlier.

Reserved matters must be applied for within the period the permission specifies, normally three years from the outline grant, and development must begin within a further period after the final approval. Diarise both dates at the point of grant. A permission that lapses because a reserved matters application went in a fortnight late is not recoverable.

The detail of what an outline leaves open is set out further in this note on reserved matters and outline permission.

Where the parameters constrained the design

Three effects showed up in the final scheme.

The heights parameter, expressed in absolute levels, forced a retaining structure on the eastern edge that the illustrative masterplan had avoided. The street alignment parameter cost a group of mature hedgerow trees that could have been retained with a two metre shift. And the fixed play space location put the equipped area further from the family housing than the layout would naturally have placed it.

None of these was fatal. All three were avoidable at outline stage by drawing corridors and zones rather than lines and points.

One honest caveat. Drawing parameters loosely invites officers and members to worry about what could be built inside them, and some authorities respond by asking for tighter parameters or by refusing. The judgement is a real one, and it is made with imperfect information about a purchaser who does not yet exist.

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

PlanScope can draft the outline stage planning documents and, later, the reserved matters supporting statements. Browse the report types and start a draft. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.