Outline permission or full planning permission

The choice between outline vs full planning permission comes down to what you need the permission to prove. Outline permission establishes that a site can be built on, in principle, at a stated quantum of development. Full permission approves a specific building, drawn and detailed, ready to start. Both are permissions in law. Only one of them lets you break ground.

For a site being taken to market, outline is usually the less expensive way to establish value. For a scheme you intend to build yourself, the saving is often illusory, because the technical evidence a council needs at outline stage is closer to the full package than developers expect.

What each application actually grants

An outline application is available where development includes the erection of a building. It asks the council to agree the principle and defers one or more of the five reserved matters set out in the Development Management Procedure Order 2015: access, appearance, landscaping, layout and scale. You can reserve all five, or fix some and reserve the rest. Access is commonly fixed at outline because the highway authority wants certainty about the junction.

Full permission approves the development as drawn. Change anything material afterwards and you need a section 73 application or a fresh permission, with section 96A available only for minor, non-material tweaks.

The practical difference sits in the conditions. An outline permission arrives loaded with parameter limits and conditions that must be discharged before work starts. A full permission arrives with a drawing schedule you must build to.

Reserved matters and how they are approved

Reserved matters are approved by a separate application, which is not a planning application in its own right. There is no fee based on units in the same way, no fresh consideration of the principle, and no second chance for the council to revisit whether the site should be developed. The scope is limited to the matters reserved and to compliance with any parameters the outline permission fixed.

That limit is the point of outline permission and its weakness. If the outline fixed a maximum of 45 dwellings across a defined developable area with a three-storey height parameter, the reserved matters submission must sit inside that envelope. Discovering at detailed design that the scheme needs 48 units or a fourth storey means a section 73 application to vary the parameters, with the delay and the risk that brings.

Parameter plans deserve real attention at outline stage. Draw them too tightly and you have removed your own flexibility. Draw them too loosely and the council will refuse, or will impose parameters of its own that suit the officer rather than the scheme.

Time limits under sections 91 and 92

The statutory clocks differ, and mixing them up is a common and expensive error.

A council can vary those default periods by condition, and it does so more often on sensitive sites, so read the decision notice rather than assuming the statutory defaults apply. A section 73 application cannot be used to extend the time limit for implementation, which is why a lapsed permission means starting again rather than tidying up a condition.

If the site is phased, the reserved matters application for phase one must still land within the outline deadline. Phasing across a longer programme normally needs the outline permission to say so expressly.

Evidence you can defer and evidence you cannot

The saving people expect from outline comes from deferring detailed design. What you cannot defer is anything the council needs to be satisfied the principle is acceptable.

• Flood risk. If the site touches Flood Zone 2 or 3, or exceeds one hectare, a Flood Risk Assessment is required at outline, because you cannot establish the principle of residential development on a site that fails the sequential test.
• Ecology and biodiversity net gain. A preliminary ecological appraisal and the baseline biodiversity value are needed at outline. Whether a protected species survey can wait depends on what the appraisal finds, and the difference between the two reports is set out in our comparison of a preliminary ecological appraisal and a protected species survey.
• Transport. The threshold that triggers a full assessment rather than a statement does not move because the application is in outline. Our note on choosing between a transport statement and a transport assessment sets out where the line falls.
• Heritage and archaeology, where a designated asset or its setting is affected.
• Contamination, where the previous use warrants it.

What does defer is elevational design, materials, detailed drainage design, hard and soft landscaping detail, internal layouts and the fine grain of the street scene. That is a real saving on architectural fees, and on a 40-unit scheme it is not trivial.

Biodiversity net gain is worth a separate thought. Where the gain condition applies, an outline permission can carry it in a phased form, with a gain plan for each phase rather than one plan for the whole site. That flexibility is useful on long programmes and it needs to be built into the application rather than bolted on later.

Cost and programme across the two routes

Outline plus reserved matters is two determination periods, not one. A major outline runs to 13 weeks statutory, reserved matters typically eight, and in practice both attract extensions of time. Against that, the outline fee for a major residential scheme is charged per 0.1 hectare and the reserved matters fee is a separate charge, so the combined cost is rarely lower than a single full application.

Where outline wins on programme is when you are selling. A purchaser can start detailed design during due diligence and submit reserved matters shortly after completion, which compresses their own timeline considerably.

Fees are indexed annually and change on 1 April, so check the current schedule on the Planning Portal before budgeting rather than relying on a figure from last year's appraisal.

Land value and what a buyer will accept

Housebuilders buy outline permissions routinely, but they price the risk in the parameters. A permission with tightly drawn parameter plans, an unresolved access strategy or heavy conditions to discharge before a start on site will be discounted, and the discount is usually larger than the cost of resolving the point before marketing.

Three things raise the value of an outline permission more than anything else: a signed section 106 with the affordable housing and contributions fixed, an access approved by the highway authority, and a drainage strategy accepted by the lead local flood authority. Those remove the three risks a buyer's technical team will otherwise price.

When outline is the wrong choice

Outline is unsuitable where the acceptability of the development depends on its design. A site in a conservation area, within the setting of a listed building, or in a sensitive rural setting will often fail at outline simply because the council cannot judge the principle without seeing the scheme. Some councils say so explicitly in their validation guidance.

It is also unavailable for development that does not involve erecting a building, so a change of use, or engineering operations alone, needs a full application. Householder development follows its own route and is not made in outline.

And on small schemes of one or two dwellings, the administrative overhead of two applications rarely pays for itself. Draw the house.

Browse the 66 PlanScope report types to see which supporting documents your outline or full application 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.