Outline or full permission for a small residential site

On a site of one to nine houses that you intend to build yourself, full permission is usually the better route. Outline permission establishes the principle of development and leaves the detail to a later reserved matters application, which suits a landowner selling with consent. It suits a self-builder much less, because you end up paying twice, waiting longer and still having to resolve the design before anyone will lend against it.

That is the general answer. The exceptions are real, and they turn on who is carrying the risk and when the money is needed.

What an outline application settles

An outline application asks the council to agree that development of a stated description is acceptable in principle at that location. Up to five matters can be reserved for later approval: access, appearance, landscaping, layout and scale. You can reserve all five, or fix some of them at outline stage.

Reserving everything sounds attractive and rarely is. Councils dislike being asked to grant permission for a quantum of development with no indication of how it sits on the site, so they either seek an illustrative masterplan or refuse for lack of information. An indicative layout is not binding, but it has to be capable of working.

The permission that results carries different time limits from a full permission. Section 92 of the Town and Country Planning Act 1990 sets the default as reserved matters applied for within three years of the outline permission, and development begun within two years of the final approval of the last reserved matter. A full permission under section 91 simply has to be begun within three years.

How reserved matters are judged

A reserved matters application is not a fresh assessment of the principle. The council is confined to the matters reserved and to any conditions attached to the outline, so objections that the site should never have been developed are not material at that stage.

What the council can still do is refuse the detail. Scale that exceeds the parameters in the outline, a layout that fails on highway safety or amenity, or an appearance that conflicts with an adopted design policy are all proper grounds. On a small site this is where self-builders lose time, because the design they want is often the reason they bought the plot, and it may not be the design the officer expects.

A Design and Access Statement is required for the reserved matters submission in most cases, and it does more work there than at outline stage.

What you have to submit at each stage

The idea that outline means less evidence is only half true. Constraints do not wait for reserved matters.

Biodiversity net gain is the one that catches people out. The statutory regime under Schedule 7A to the Town and Country Planning Act 1990 applies to outline permissions as well as full ones, with the gain plan able to follow for phased development. A Biodiversity Net Gain Assessment needs a competent person to complete the statutory metric, so budget for it whichever route you take.

There is a genuine exemption worth knowing. Self-build and custom build housing is exempt from the biodiversity gain condition where the development consists of no more than nine dwellings on a site of no more than 0.5 hectares and the dwellings are all self-build or custom build. The conditions are cumulative, and the exemption has to be claimed properly.

Fees, time and the total bill

Outline fees are calculated on site area rather than on the number of dwellings, and a reserved matters application attracts its own fee afterwards. National planning fees are uplifted and indexed annually from 1 April, so check the current fee schedule on the Planning Portal before you budget rather than relying on a figure in an old article.

The timing arithmetic matters more than the fee. An outline determination of eight weeks for a minor application, followed by design work, followed by another eight week reserved matters determination, plus the validation lag at each end, is realistically six to nine months of elapsed time before you can start. A full application collapses that into one determination period, at the cost of doing all the design work up front.

Ownership certificates apply at both stages, and getting them wrong invalidates the application, which is set out in ownership certificates A, B, C and D compared.

Land value and funding

This is the real reason outline exists. A plot with outline permission sells for far more than one without, and the seller avoids the cost of a full design for a house someone else will live in. If your plan is to obtain consent and sell, outline is efficient.

If your plan is to build, lenders behave differently. Self-build mortgage products generally release stage payments against a full permission and approved building regulations plans. An outline consent with everything reserved is not something a lender will advance against, so you will be funding the design work from savings in any case.

There is also the CIL question. Community Infrastructure Levy liability crystallises on commencement, and the self-build exemption has to be claimed and the form submitted before any work starts, a sequence covered in self-build against residential extension CIL exemption. The exemption does not care which route you took, but the paperwork timing does.

An illustrative example

Illustrative only: a couple buy a 0.15 hectare garden plot with an existing hedge along two boundaries. They take outline permission with access fixed and everything else reserved, because they want certainty before committing to an architect.

Outline is granted after 11 weeks with conditions requiring tree protection and a biodiversity gain plan. The reserved matters submission, 14 months later, is refused on scale and appearance because the two storey design sits higher than the neighbouring bungalows. They resubmit with a lowered ridge, approved four months after that.

Total elapsed time to a start on site: over two years. A full application at the outset, with the design tested at pre-application stage, would very likely have been faster.

When a hybrid application helps

A hybrid application seeks full permission for one part of a site and outline for the rest. On small sites it is worth considering where you want to build one house now and keep a second plot for later, or where an existing building is being converted while new plots are held back.

The trade-off is complexity. Hybrids need careful drafting of the description of development and the red line, and conditions have to distinguish clearly between the two parts. On a two or three plot site the administrative overhead often outweighs the benefit.

Decide on the basis of when you need the money and when you need to start. If neither answer is soon, outline gives you flexibility. If you want to be on site next spring, apply in full.

Enter your postcode on PlanScope to see which supporting documents your plot is likely to need at each stage.

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.