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Bettesworth Construction
construction law

What to Do If You Receive an Illegal Construction Notice or Penalty

A notice for unauthorised construction can trigger different procedures depending on where you are and who issued it. Learn what to check first and how England planning enforcement appeals work.

By Bettesworth Construction Team 5 min read
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Start by identifying the country, issuing authority and exact type of notice: “illegal construction” can refer to different planning, building-control, listed-building or municipal processes. Then mark every deadline on the document and get advice promptly if an appeal or compliance date is near. The steps below explain the England planning-enforcement process as an example, not a rule for other jurisdictions.

What to do first

  1. Read the whole document. Note who issued it, what work or activity it identifies, what it requires you to do or stop doing, and the dates for appeal and compliance. Keep the notice, envelope, attachments and any plans together.
  2. Preserve relevant records. Make copies of photographs, planning permissions, building documents, correspondence and evidence of when the work took place. Keep originals and record when and how you received the notice.
  3. Contact the issuing authority promptly. Ask it to clarify the allegation and identify the documents or evidence it relies on. Keep a dated record of calls and written exchanges; do not treat a discussion as an extension of a formal deadline.
  4. Get case-specific advice if time is short. A planning solicitor or planning consultant can help assess the notice, eligibility, possible grounds and evidence. If the notice raises an immediate structural danger, follow any emergency directions and contact the responsible local authority or emergency service as appropriate.

Which kind of notice have you received?

The document’s title and issuing authority matter because different notices can have different procedures. A planning enforcement notice is not interchangeable with a building-control notice, a listed-building notice, an enforcement warning notice or a local penalty. Confirm the process with the authority named on the document and consult the rules for your jurisdiction.

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England example: responding to a planning enforcement notice

Find the appeal deadline before choosing a route

In England, a person eligible to appeal a planning enforcement notice must ensure the appeal is received before the effective date shown on the notice. The Planning Inspectorate’s Enforcement notice appeals: Procedural Guide England, updated 22 April 2026, says a late appeal will be turned away. Do not assume that contacting the council, seeking retrospective permission or negotiating informally stops that deadline. GOV.UK’s Appeal against an enforcement notice page says there is no fee for the appeal itself, unless you also make a planning-permission application.

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The Inspectorate recommends submitting online where possible. If you cannot appeal online before the deadline, its guide describes notifying the Inspectorate by letter or email, clearly saying that you are appealing and providing your name and address, the local planning authority, the site or building address, and the notice’s effective date. Follow the current instructions in the guide and on your notice.

Check whether you are entitled to appeal

Do not assume that everyone sent a copy of a notice has the same appeal right. The Inspectorate’s guide describes eligibility in terms of a legal or equitable interest in the land, or being a relevant occupier: someone occupying with the owner’s consent when the notice was issued and continuing to occupy when appealing. GOV.UK summarizes eligibility as owning, renting or lawfully occupying the property. Check the precise test against the notice and official guide before relying on an appeal.

Choose grounds that fit the facts

An appeal is not simply a request for more time. The Inspectorate’s guide lists grounds that may include disputing whether a breach occurred, whether the alleged matters amount to a breach, whether planning permission was needed or the work complied with permission, whether enforcement is time-barred, whether service requirements were met, or whether the required steps go further than necessary to remedy the breach or its effects. Which grounds apply depends on the notice and evidence; the list is not a checklist of grounds available in every case.

Connect each ground to supporting evidence. For example, a claim that work is older than the applicable enforcement period needs reliable dates and documents, not just an assertion. The England guide describes four-year periods for specified operational development and single-dwellinghouse changes of use completed or occurring before 25 April 2024, ten-year periods for corresponding cases on or after that date, and ten years for other breaches, subject to exceptions and transitional arrangements. The relevant period depends on the breach type and circumstances.

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Should you seek permission, appeal or comply?

These routes can have different purposes and deadlines. The table is an England planning-enforcement overview, not a substitute for checking the actual notice and applicable rules.

Route What it is for Key point to check
Appeal an enforcement notice Challenge the notice on an applicable ground. For an eligible appellant, the appeal must be received before the effective date. Identify the grounds and evidence that fit the case.
Apply retrospectively for planning permission Ask the local planning authority to grant permission after development has taken place. An application is not the same as an appeal. Do not assume it pauses an appeal deadline; check whether this route remains available in your circumstances.
Respond to an enforcement warning notice Where the authority considers there is a reasonable prospect development could be acceptable, it may invite a retrospective application. England guidance says there is no Secretary of State appeal against service of this warning notice. Missing its specified application deadline may lead to further enforcement action.
Comply with the notice Carry out the required steps or stop the specified activity. Check exactly what must be done and by when. If you dispute the requirements, get advice before the relevant deadline rather than assuming compliance can be deferred.

The Ministry of Housing, Communities and Local Government’s Enforcement and post-permission matters guidance describes retrospective applications and an appeal on ground (a) as ways to seek permission after the event in the stated planning context. It also says an authority may decline to determine a retrospective application in certain circumstances after an enforcement notice has previously been issued. Verify which route is open to you and keep any application deadline separate from the notice’s appeal deadline.

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What happens if you do not comply?

In England, the government guidance says failure to comply with a planning enforcement notice after its compliance period has elapsed, when there is no outstanding appeal, is an offence. A person convicted can face an unlimited fine; the court considers any financial benefit accrued or likely to accrue from the offence when determining the fine. This is not an automatic penalty for receiving a notice, and it is not a universal rule for construction notices outside this England planning context.

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What to verify with the authority or an adviser

  • The country and legal process that govern the notice.
  • The notice type, the authority’s alleged breach and the steps it requires.
  • Who can appeal, the effective date, the appeal deadline and any compliance or application deadline.
  • Which response route is available, what outcome you are seeking and what evidence supports it.
  • Whether a time-limit argument applies to this kind of breach and the relevant dates.

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