Outline or full application as a housing scheme grows

Choosing between an outline or full application on a housing site is a question about what you are willing to pay to design before you know you have permission. Below roughly 20 units, a full application is usually the cheaper and faster route because the detailed design cost is modest and there is no second determination to programme. Above 50 units, and on anything phased, outline with reserved matters starts to earn its keep, because you fix the principle and the quantum without drawing 80 house types that a layout change would throw away.

The consequences reach past the fee account. Route choice changes what your consultees can insist on, when the section 106 obligations are settled, and what a funder will lend against.

What each route commits you to

A full application seeks permission for the development as drawn. Every elevation, every material, every tree, every parking space. The decision either approves that scheme or refuses it.

An outline application establishes the principle and reserves one or more of the five matters defined in the Development Management Procedure Order 2015: access, appearance, landscaping, layout and scale. Whatever is not reserved is decided at outline and cannot be revisited later. So an outline application with access fixed and everything else reserved locks the junction design at the start, which is often exactly what you want because access is the matter most likely to attract a refusal.

Outline does not mean vague. Article 5 of the 2015 Order requires an outline application to describe the development, and where scale is reserved it requires the upper and lower limits for the height, width and length of each building. Where layout is reserved, the approximate location of buildings, routes and open spaces has to be given. An outline application submitted without those parameters is not a valid one.

Parameter plans and the level of detail as schemes grow

At 10 to 30 units, parameters are usually a development framework plan, a storey heights plan and a schedule of maximum footprints. At 150 units and above, the parameter set becomes a document in its own right: land use budget, maximum and minimum building heights by zone, movement hierarchy, green infrastructure, and a phasing plan that ties each phase to its infrastructure.

Where the scheme is Environmental Impact Assessment development, the parameters have to be drawn tightly enough for the assessment to be meaningful. The approach that emerged from the Rochdale cases is to assess the maximum reasonable envelope rather than an indicative layout, so that whatever comes forward at reserved matters has already been assessed. Loose parameters produce an Environmental Statement that assesses nothing in particular, and that is an invitation to challenge. An Environmental Impact Assessment under the 2017 Regulations must be prepared by competent experts, which is a legal requirement rather than a recommendation; a PlanScope draft is a starting point for that team, not a substitute for it.

Design codes have become the other half of this. On larger outline schemes, authorities increasingly secure a code by condition or through the section 106 agreement, then test reserved matters against it. Reading the code as a constraint on your own reserved matters submissions, rather than as a planning gain, saves arguments later.

Reserved matters, conditions precedent and where appeals bite

Reserved matters are approvals of detail, not new permissions. The principle of the development, and anything settled at outline, is closed. That is the protection outline buys, and it also means a refusal of reserved matters cannot be appealed on the basis that the houses should be allowed at all.

Two practical points. First, reserved matters can be submitted in parts and by phase, which is how a large site gets built out over a decade, but the first submission must go in within three years of the outline grant. Second, distinguish reserved matters from conditions precedent. A condition requiring a construction management strategy before any development begins is not a reserved matter, and discharging it does not extend any time limit. Keep two separate schedules.

Statutory periods do not change because the application is a reserved matters one: eight weeks for minor development, 13 weeks for major. The list of consultees does change as the scheme grows, and the consultees that appear as a scheme gets bigger is worth checking before you set the programme, because one late response from a water undertaker or the highway authority moves everything.

Fees and programme

Outline fees are calculated on site area, full applications on the number of dwellings, and reserved matters carry their own charge. Two determinations therefore cost more in fees than one, and the national scale is indexed annually, so price it from the current schedule rather than from last year's spreadsheet.

The programme comparison is less obvious than the fee one. A full application on a 40 unit site might take six months to prepare and 13 weeks to determine. An outline on the same site might take three months to prepare and 13 weeks to determine, followed by a reserved matters submission that takes another four months to prepare. Outline gets you to a planning decision sooner. It does not get you to a spade in the ground sooner.

Section 106 and affordable housing at outline

Heads of terms are normally agreed and the agreement completed at outline. The affordable housing percentage, tenure split and the contributions towards education, health and open space are all fixed then, on a viability position based on assumptions rather than tenders.

That has two consequences. The assumptions you accept at outline bind you through reserved matters, so a sales value or build cost agreed optimistically in year one is a problem in year four. And where a scheme is marginal, review mechanisms become the negotiation: an early stage review if implementation is delayed, a late stage review if values move. An Affordable Housing Statement prepared at outline should state the mix and tenure being offered and the policy it responds to, not simply the percentage.

On a phased scheme, make sure the agreement allocates obligations to phases. An undifferentiated obligation to deliver 35 per cent affordable housing across a site is much harder to fund phase by phase than one that says what each phase carries.

Land value, funding and option triggers

Option and promotion agreements usually trigger on the grant of planning permission, and the definition of that trigger deserves a careful read. An outline permission with reserved matters outstanding is a permission, so a poorly drafted trigger can crystallise a payment long before the site is buildable.

Lenders take the opposite view. Development finance is normally drawn against an implementable permission, which means outline plus discharged reserved matters plus discharged conditions precedent. Where the funding sits on the critical path, count the reserved matters period as part of the planning programme rather than as a detail.

Access is the item that most often decides land value, because a site whose access is proved is a site a housebuilder can price. Fixing access at outline, even when everything else is reserved, is often the single most valuable thing an outline application does. Where the access itself changes character as the scheme grows, moving from a single access to an internal road network brings in adoption, visibility and refuse tracking issues that are better settled at outline than argued at reserved matters.

Where a hybrid or permission in principle helps

A hybrid application seeks full permission for part of the site and outline for the rest. It suits a scheme with an early phase that is ready and later phases that are not: build the spine road and the first 60 homes on the full element while the rest sits under parameters. The drawback is complexity, because one red line carries two sets of rules and the section 106 has to keep up.

For small housing sites there is a third route. Permission in principle, followed by a technical details consent, establishes the location, land use and amount of development for minor housing development, and it can be faster than outline where the constraints are light. It is little used, and on any site with heritage, flood or ecology constraints the technical details stage will need the same evidence as a full application anyway.

The honest summary: route choice is a cash flow decision dressed up as a planning one. Work out when the client needs a decision, when they need a spade, and who is paying for the design in between. Enter your postcode on PlanScope to see which reports an outline or full submission on your site is likely to need.

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. For specialist technical reports, qualified professional input may be required.