Retrospective planning help for work that’s already been done
For owners who have built, bought or inherited work that never had planning permission. Compare quotes from professionals who can assess your position and prepare a retrospective application.
A retrospective planning application asks your council to grant permission for development that has already happened, such as an extension, outbuilding, fence, dormer or change of use that went ahead without approval. It often comes up when a property is being sold, after a neighbour complains, or when the council writes about a possible breach. Councils assess these applications on their planning merits, in the same way as if the work had not been carried out. A good professional first checks whether permission is actually needed, then records the work as built, judges whether it is likely to be acceptable and, if not, suggests changes that could make it so.
How a professional can help
- Checking whether you need to apply at all: The work may have been permitted development, or may already be lawful because the time limits for enforcement have passed. They check this first, as a certificate of lawfulness could be the more suitable route.
- Surveying the work as built: They measure and draw what is actually on site, not what was meant to be built, so the application accurately shows the size, position and materials of the work.
- Assessing the planning merits: They test the work against local policy and the concerns most likely to be raised, such as overlooking, loss of light, height or appearance, and give you a frank view of its prospects.
- Proposing changes that could help: Where the work as it stands is unlikely to be approved, they can suggest alterations to include in the application, such as obscure glazing, a lower roof, screening or different materials.
- Working with the enforcement team: If the council’s enforcement officers are involved, they can explain the application to them and help you keep to any deadlines the council has set while it is considered.
- Building Regulations sign-off: Planning and Building Regulations are separate. They can advise on getting unapproved work signed off by building control, which may involve opening up parts of the work for inspection.
Is this right for you?
- You’re selling, and the buyer’s solicitor has found an extension or conversion with no planning permission.
- You’ve bought a property and discovered that earlier work was never approved.
- The council has written to you about work you’ve carried out, or a neighbour has complained.
- You went ahead believing the work was permitted development and are no longer sure it was.
How the project usually runs
- Gather the facts: Your professional reviews the planning history, when the work was done, any council letters and the photos and documents you have, to understand exactly what needs approval.
- Measured survey: The work is measured and drawn as built, with plans and elevations, and, where relevant, drawings showing how the property looked before the work started.
- Strategy and design changes: They advise whether to apply for the work as it stands or with changes, or whether a certificate of lawfulness is the stronger route, and draw up any amendments.
- Submit the application: The retrospective application goes in with drawings and a statement explaining the work. The council consults neighbours and decides it in the same way as any other application.
- After the decision: If it’s approved, you meet any conditions and arrange Building Regulations sign-off. If it’s refused, your professional explains your options, which may include an appeal or altering the work.
What affects the cost
- What was built, how large it is and whether it needs a full measured survey.
- Whether the council’s enforcement team is already involved, and any deadlines it has set.
- How much evidence is needed about when the work was done and how the property looked before.
- Whether design changes to the work are needed to give it a realistic chance of approval.
- Extra consents involved, such as listed building consent, or getting Building Regulations sign-off for the work.
Enforcement, time limits and Building Regulations
- Building without planning permission isn’t usually a criminal offence in itself, but ignoring an enforcement notice is, and unauthorised work to a listed building can be.
- Councils can only take enforcement action within set time limits, which differ between nations and changed in England in 2024. In England in particular, deliberately concealed work can be pursued later still.
- In England, since 2024, the timing of a retrospective application can limit the arguments open to you if the council issues an enforcement notice, so take advice before you apply.
- In England and Wales, unapproved building work can often be regularised with council building control; Scotland and Northern Ireland have their own routes.
Questions people ask
Will my retrospective application be treated more harshly?
It shouldn’t be. Councils are expected to judge retrospective applications on their planning merits, just as they would if the work hadn’t started. That said, the work is there to be seen, neighbours may feel strongly and any problems are obvious, so a carefully prepared application with accurate drawings matters.
Can the council make me take the work down?
If the work is unacceptable and the council is still within the time limits, it can serve an enforcement notice requiring the work to be altered or removed. Councils are expected to act proportionately and often invite a retrospective application first. A professional can explain the risks in your case, but only the council, or an appeal, can decide.
Should I apply for retrospective permission or a certificate of lawfulness?
They answer different questions. A retrospective application asks whether the work is acceptable in planning terms. A certificate asks whether it is already lawful, for example because it was permitted development or the time limits for enforcement have passed, and turns on evidence rather than opinion about the design. Your professional can tell you which fits your situation.
I’m selling my house. Is indemnity insurance enough?
Some buyers and lenders accept indemnity insurance for a missing permission, but it doesn’t make the work lawful, and contacting the council about the work can affect whether a policy is available. Your conveyancing solicitor is the right person to advise on that. A professional can explain the planning position so you and your solicitor can decide what to do.
Do I also need Building Regulations approval for work already done?
If the work needed approval and didn’t get it, yes, and it’s a separate matter from planning. In England and Wales, councils can issue a regularisation certificate after inspecting the work, which may mean exposing foundations, insulation or structure. Your professional can prepare drawings and calculations to support it.
Available across the UK
Professionals cover the whole of the UK: England, Scotland, Wales and Northern Ireland. Planning and Building Regulations differ between the four nations, and your professional will work to the rules that apply where your property is.