Planning enforcement orders and deliberate concealment

A planning enforcement order lets a local planning authority take enforcement action against a breach that would otherwise be immune, where the breach was deliberately concealed. The authority applies to a magistrates court, and if the court is satisfied that the apparent breach was concealed, it makes an order that opens a fresh window for enforcement after the statutory time limit has expired. The provisions sit at sections 171BA to 171BC of the Town and Country Planning Act 1990, inserted by the Localism Act 2011.

The power is used rarely. When it is used, it usually decides the case, because the developer's entire position rested on the clock having run.

The problem the power was created to solve

Before 2011 the immunity rules were mechanical. Operational development became immune after four years, most changes of use after ten, and nothing in the Act distinguished between an owner who simply went unnoticed and one who had gone to lengths to avoid being noticed.

Two cases exposed the gap. In Welwyn Hatfield Borough Council v Secretary of State for Communities and Local Government the Supreme Court dealt with a building erected with permission as a barn, which had in fact been fitted out as a house and lived in behind closed doors for more than four years, with the deception maintained throughout. The court held that the owner could not rely on the time limit where he had positively deceived the authority. Around the same period a separate case involved a house built behind a screen of straw bales and tarpaulins, the screen being removed only after the four years had run.

Parliament's answer was the planning enforcement order, which puts the question to a court rather than leaving it to a common law principle developed case by case.

Applying to the magistrates court

The authority applies to a magistrates court for an order in relation to an apparent breach of planning control.

The application has to be made within six months of the date on which evidence of the breach, sufficient in the authority's opinion to justify the application, came to its knowledge. The authority certifies that date, and the certificate is evidence of it. That six month window is the discipline on the power: an authority that sits on evidence loses the route.

The court may make the order only if satisfied, on the balance of probabilities, that the apparent breach or something substantially contributing to it has been deliberately concealed by any person, and that it is reasonable to make the order having regard to all the circumstances. Notice of the application must be given to the owner and occupier of the land and to anyone else with an interest that would be materially affected.

The effect of an order on time limits

An order does not itself authorise enforcement. It creates an enforcement year.

The enforcement year begins at the end of 22 days after the day the court makes the order, or, where an application is made to the High Court or the Crown Court in relation to the order, when those proceedings are finally determined. During that year the authority may take enforcement action in respect of the apparent breach even though the normal time limit has expired. Outside the year, the immunity reasserts itself.

The practical consequence for an authority is that the investigation has to be complete before the order is sought. An enforcement notice drafted in a hurry inside a twelve month window, on a site where measurements and dates are contested, is an appeal waiting to happen.

Evidence of deliberate concealment

Concealment means more than a breach that nobody noticed.

The evidence authorities assemble tends to fall into recognisable groups. False or misleading statements on application forms and in correspondence. Physical screening, hoarding or landscaping that hides the works. Building something internally different from the approved drawings while the exterior matches them. Council tax, electoral roll, utility and postal records that contradict the claimed use. Aerial photography and satellite imagery showing the sequence of works. Statements from neighbours and contractors.

The strongest cases combine an active step to mislead with an internal inconsistency in the owner's own paperwork. Silence alone is weaker, and an authority relying on nothing more than an owner's failure to volunteer information is on difficult ground. The concealment also has to relate to the breach or to something substantially contributing to it, so concealing an unrelated matter does not open the door.

How authorities use the power in practice

Enforcement teams are stretched, and orders take officer time, legal resource and a court listing. Most authorities reserve the power for cases with a serious planning harm behind the deception, or where the conduct is flagrant enough that not acting would undermine public confidence in the system.

That produces a pattern. Dwellings created inside agricultural or commercial buildings. Unauthorised residential occupation of buildings presented as something else, sometimes on sites where a Class MA prior approval was never sought. Works in the Green Belt or in designated areas where the harm persists. The Levelling-up and Regeneration Act 2023 also moved enforcement time limits in England towards a uniform ten year period, which lengthens the ordinary window and changes the calculation about when an order is worth pursuing. Check the commencement position and the transitional provisions before advising on any specific case, since the change applies by reference to when development was substantially completed. The broader pattern of recent statutory change is tracked on the planning law timeline.

Defending an allegation of concealment

The defence runs on three fronts, and the first is usually the most productive.

1. Challenge the six month certificate. When did the authority actually hold evidence sufficient to justify an application? Complaint records, officer site visit notes and internal emails obtained through an information request often show knowledge earlier than the certified date.
2. Challenge deliberateness. Concealment has to be deliberate. An owner who built something different from the approved plans through incompetence, or who believed in good faith that the works were covered by permitted development rights, is in a different position from one who set out to mislead.
3. Challenge reasonableness. The court must find it reasonable to make the order in all the circumstances, which lets you raise delay, the conduct of the authority, the scale of the harm and the personal circumstances of the occupiers.

Evidence preparation matters more than argument here. Dated photographs, invoices, delivery notes, contractor statements and utility records that establish an honest chronology are worth more than any submission about the burden of proof.

Interaction with lawful development certificates

The two regimes meet head on, and the sequencing is where cases are won and lost.

An owner seeking to regularise a long-standing breach applies for a certificate of lawfulness of existing use or development under section 191. That application puts the chronology in front of the authority, in writing, with supporting evidence. Where the evidence is thin or inconsistent, that application can itself supply the authority with the material it needs, and it starts the six month clock running on a date the owner has effectively chosen.

The Welwyn Hatfield principle also survives alongside the statutory power. A certificate cannot be obtained by positive deception, and a certificate procured by false statements can be revoked under section 193, with the making of a false or misleading statement being an offence. So the honest answer to a client whose position depends on concealment is that the certificate route may make things worse rather than better.

Where the history is merely undocumented rather than hidden, the analysis is different and the certificate is usually the right move. The distinction between an owner who was quiet and an owner who was deceptive is the whole of this area of law, and it is worth taking counsel's opinion before filing anything on a site where the line is unclear.

This is general guidance, not legal advice. Check the position with your local planning authority or a qualified professional before relying on it.

Browse the 66 report types on PlanScope to see the evidence a regularising application normally has to carry.

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