The 21-day publicity period and neighbour notification

The planning application consultation period runs for a minimum of 21 days, counted from the day a site notice goes up or a neighbour letter is served. Where the council advertises in a local newspaper instead, the minimum is 14 days from publication. Both figures come from Article 15 of the Town and Country Planning (Development Management Procedure) (England) Order 2015, and both are floors rather than ceilings. Councils regularly allow longer over Christmas or where a scheme is contentious.

Missing the published date does not necessarily mean your comment is lost. That part is widely misunderstood, and it is worth getting right before you write anything.

What the Development Management Procedure Order requires

Article 15 sets the publicity method by the type of development, not by the number of people who might care about it. A council has no discretion to skip a step, though it can always do more than the minimum.

Listed building consent, and applications affecting the setting of a listed building or the character of a conservation area, carry their own publicity duties under sections 67 and 73 of the Planning (Listed Buildings and Conservation Areas) Act 1990. Those always involve a site notice and a press advert. If you live in a conservation area and the council has only posted letters, the application is probably not one that engages those sections, but it is a fair question to put to the case officer.

Major development, for these purposes, means ten or more dwellings, a site of half a hectare or more where the number of dwellings is unknown, or 1,000 m² or more of floorspace on a site of one hectare or more. A householder rear extension is at the other end of the scale and attracts the lightest touch.

Site notices, press notices and letters

A site notice is a laminated A4 sheet fixed to a lamp post, fence or gate near the application site. It has to stay up for the whole period, and it has to be legible from a place the public can reach. Notices come down. They get soaked, or a contractor removes them, and the council is not required to keep replacing one it displayed properly in the first place, though officers will often re-run publicity if it clearly failed.

Neighbour letters go to adjoining owners and occupiers. That phrase is narrower than most people expect: a property across a road may not be adjoining, and a flat two doors down almost certainly is not. Councils vary in how generously they interpret it, and a wider circulation is a matter of local practice rather than law.

The newspaper notice is the one that catches large schemes and departures. It runs once, in a paper circulating in the area, and the clock starts on the date of publication rather than the date the council sent the copy.

The 21-day minimum and late comments

The period is a minimum for the council, and the practical consequence is a negative one. Article 15 stops the authority determining the application before the period expires. It does not create a cut-off after which representations must be disregarded.

So a comment sent on day 30 of a case that has not yet been decided will normally be read and reported. A comment sent after the decision notice is issued is too late for anything except a complaint about process. Officers usually work to the point at which the delegated report is signed or the committee agenda is published, which can be several weeks after the advertised date.

Send the comment early anyway. Late representations arrive after the officer has formed a view and after consultees have replied, and they carry less practical influence even when they are properly considered.

Re-consultation on amended plans

Nothing in the Order obliges a council to re-advertise revised drawings. The question is whether proceeding without further publicity would be unfair, and the long-standing test is whether the amended scheme is substantially different from the one people were asked about. A reduction in height rarely triggers re-consultation. A new first-floor window facing a neighbour's garden usually should.

Councils differ, and some publish an internal protocol setting out when they re-consult and for how long, often 14 days rather than 21. If plans have changed on a case you care about, ask in writing whether the council intends to re-advertise and note the reply.

What the case officer must take into account

Section 70 of the Town and Country Planning Act 1990 requires the decision-maker to have regard to the development plan and to any other material considerations. Representations are the route by which material considerations reach the officer, which is why the content matters far more than the volume.

Points that carry weight include overlooking and loss of privacy, loss of light, highway safety, parking stress, noise, drainage, harm to a listed building or conservation area, tree loss and conflict with a named local plan policy. Points that do not include loss of a private view, the effect on property values, boundary disputes, the identity of the applicant and the fact that building work is disruptive.

A Planning Statement submitted by the applicant is where the policy case is set out, and reading it before you comment is the fastest way to see which policies are in play. Where the proposal is a larger scheme, the applicant may also have lodged a Statement of Community Involvement describing what consultation they carried out before applying, and any gap between what that document claims and what neighbours experienced is itself a point worth raising.

Volume still has one procedural effect. Most councils have a scheme of delegation that sends an application to planning committee once a threshold number of contrary representations is reached, often between three and ten. That threshold is published in the council's constitution.

Finding the dates on the council register

Every application appears on the council's online register, and the entry carries the dates you need: registration, the start and end of the consultation period, the target determination date and the case officer's name. The weekly or fortnightly list of validated applications is the other place to look, and most councils let you subscribe by email or by ward.

If a document is missing from the register, ask for it. Applicants sometimes submit supporting reports late, and the council should publish them. The full set of report types that might accompany an application gives you a sense of what should be there for a scheme of a given size, from a Transport Assessment on a large site to a Flood Risk Assessment where the site sits in Flood Zone 2 or 3.

And if you plan to speak at committee, register separately. Speaking rights are not part of the publicity process, the deadline is usually a day or two before the meeting, and commenting in writing does not book you a slot.

Curious which documents a site of your own would need before you apply? Enter a postcode on PlanScope to see which reports the constraints at that address are likely to trigger.

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.