Householder or full application: which to submit

Use a householder application for extensions, alterations and outbuildings within the curtilage of a house. Use a full application for anything involving a flat, a new dwelling, a change of use, or work outside the residential curtilage. Get it wrong and the council will either invalidate the submission or accept it and then refuse it on procedural grounds, and either way you lose several weeks.

The difference that surprises people most is the appeal window. Twelve weeks for a householder refusal, six months for most others.

What the householder route covers

The householder application form exists for development within the curtilage of a dwellinghouse, or to a dwellinghouse, where the works are for a domestic purpose. In practice that means single and two storey extensions, loft conversions with dormers, porches, garages, garden rooms, outbuildings, decking, hard surfacing, boundary walls and fences, and alterations such as new windows or external cladding.

It also covers works that would have been permitted development but fall outside the limits, which is the usual reason a householder ends up applying at all.

What falls outside it

The list of exclusions is short and rigid.

Flats catch more people than anything else. A ground floor flat owner extending into their own garden is doing something that looks exactly like a householder extension and is legally not one, because the householder route is confined to dwellinghouses.

Conservation area status does not change the route. It changes what has to accompany the application, and it removes some permitted development rights, but a householder extension in a conservation area still uses the householder form.

Fees and determination periods

Both routes carry an eight week statutory determination period for this scale of work. Major development runs to thirteen weeks and development requiring environmental impact assessment to sixteen.

Fees differ, and they are set by national regulations which have been indexed annually since April 2025. Rather than quoting a figure that will be wrong within months, use the fee calculator on the Planning Portal and check it on the day you submit. A householder fee is a single flat charge. A full application for a new dwelling is charged per dwelling, so the two are not remotely comparable in cost.

One practical point on fees. Where a proposal mixes householder work with something outside the route, such as an extension plus a new access onto a classified road, the whole thing becomes a full application and is charged accordingly. Splitting it into two applications to save a fee usually costs more in professional time than it saves.

Appeal routes and timescales

This is the reason the choice matters after the decision rather than before it.

A refused householder application must be appealed within twelve weeks of the date of the decision notice. It goes through an expedited written representations procedure with a short form, no new evidence beyond what was before the council, and no opportunity for third parties to add fresh objections. Awards of costs are not generally available.

A refused full application carries a six month appeal deadline and the standard written representations, hearing or inquiry routes, with costs available where a party has behaved unreasonably.

Twelve weeks passes quickly when a client is deciding whether to redesign or appeal. Diary the deadline on the day the refusal arrives.

Flats, maisonettes and why they differ

The statutory definition of a dwellinghouse for these purposes excludes a building containing one or more flats, and a flat itself. So the householder route, and householder permitted development rights under Part 1 of the General Permitted Development Order, are unavailable to flat owners entirely.

That has two consequences worth stating plainly. A flat owner needs permission for work that a house owner could do freely, including many alterations, and the application is a full one with the accompanying cost and documentation. The Planning Statement for a flat extension therefore has to address matters a householder proposal would never reach, including the effect on other occupiers of the same building.

Leasehold consent is a separate matter from planning and is often the harder obstacle. Planning permission does not override a lease.

Mixed proposals and what to do with them

Where part of the proposal falls outside the householder route, the whole application becomes a full one. There is no hybrid.

Common examples are an extension combined with the creation of an annexe capable of independent occupation, an extension plus subdivision of the garden for a new plot, and works to a house that also involve land the applicant has recently bought from a neighbour.

The annexe case is the frequent one, and whether the outbuilding is incidental to the house decides which route applies. Where the answer is unclear, an application for a certificate of lawfulness is the way to settle it, and the difference between that route and a permission application is set out in lawful development certificate or planning permission.

Where the work might not need permission at all, check whether a prior approval procedure applies before assuming an application is needed, as explained in prior approval or planning permission.

What happens if you choose wrongly

Validation teams check the application type against the description of development. If they spot a mismatch, you get an invalidation letter, a request for the correct form and fee, and the eight week clock does not start until the corrected submission is complete.

If it slips through, worse follows. A permission granted on the wrong form can be vulnerable, and a council that notices after the event may invite a fresh application. Where a householder permission has been granted for something that should have been a full application, the decision itself may be open to challenge by a neighbour.

Changing an existing permission afterwards, whether by non-material amendment or a section 73 application, is a separate exercise covered in discharging conditions or amending a permission.

If in doubt, ring the council's validation team before you submit. They answer this question several times a day and would rather answer it than send your file back.

Put the description of development in the same words on the form, the drawings and the covering statement. Most mismatches picked up at validation are not really about the route at all. They are about a description that says one thing while the block plan shows another, and five minutes of proofreading removes the problem entirely.

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. Enter your postcode on PlanScope to see which supporting documents your application is likely to need.