Planning Permission Check: What Every UK Buyer, Investor and Conveyancer Needs to Know

You can check whether planning permission has been granted on any property in England using your local planning authority's public portal, or through the national Planning Portal. A search takes minutes. But knowing what the results mean — and what they don't show — is where most buyers go wrong.

Definition: Planning Permission Check A planning permission check (also called a planning history search) is the process of reviewing the formal records held by a local planning authority (LPA) to establish whether applications have been submitted, approved, refused or are pending for a given address or land parcel. It does not confirm whether approved works were carried out lawfully, or whether all works were ever submitted for approval in the first place.

Why Does Planning Permission Matter When Buying Property? When you buy a property, you're not just buying the building as it stands today. You're buying its legal history — every extension, loft conversion, outbuilding, and change of use that has ever been made to it. If any of those works were carried out without the required consent, you inherit the risk. That risk isn't theoretical. Mortgage lenders can refuse to lend on properties with unresolved planning breaches. Insurers can decline to cover structural work done without building regulations sign-off. And if a local authority chooses to enforce, they can require works to be reversed — even years after completion. For investors, this matters at portfolio scale. For first-time buyers, it can derail an already stressful purchase. For conveyancers, it's a professional liability question.

How to Check Planning Permission Online Using the Planning Portal The Planning Portal is the national gateway for planning in England and Wales. It links to each local planning authority's own public-facing search system, where you can search by address, postcode or application reference number. From there you can view:

Applications submitted (including withdrawn applications) Decision notices (approvals and refusals) Conditions attached to any permission Appeals and enforcement notices, in some cases

The depth of historical data varies by council. Some go back decades. Others have gaps, particularly for works completed before the 1990s when records were digitised. Wales operates through Cyfoeth Naturiol Cymru / NRW and the relevant LPA portals. Searching Directly With the Local Planning Authority Each LPA maintains its own planning register. You can find your LPA using the Planning Portal's postcode tool. If you need older records or documentary evidence for a transaction — such as decision notices or drawings — you may need to submit a formal request or pay a small fee. What a Planning Search Through HMLR Can Tell You HM Land Registry records don't contain planning history directly, but the title register and title plan can indicate changes in land use or boundaries that warrant further investigation. A conveyancer reviewing a title pack will often flag discrepancies between the physical property and the register — a good prompt to check the planning history more carefully.

What a Planning Permission Check Does and Doesn't Reveal This is the part most online guides skip past — and it matters enormously. What It Does Reveal

Whether a formal application was submitted for a specific development Whether permission was granted, refused or is pending The conditions attached to any permission (e.g. materials, hours of use, drainage requirements) Whether any enforcement action has been formally recorded

What It Doesn't Reveal

Whether the works described in the application were actually carried out Whether the works as built match the approved drawings Whether works that didn't require a formal application (permitted development) were carried out correctly and within the permitted development thresholds Whether conditions attached to a permission were ever formally discharged

This last point is particularly important. A planning permission can be granted with conditions — for instance, requiring drainage details to be agreed before work starts, or materials to be approved. If those conditions weren't discharged, the permission may technically be unlawful to implement. This rarely shows up in a standard search.

What Is a Consent Gap — and Why Should You Care? A consent gap is the difference between what a property looks like on the ground and what the planning and building control records say should be there. A rear extension that appears on the EPC floor plan but has no corresponding planning application. A loft conversion with a new ridge height but no permitted development notification. An outbuilding recorded in a recent mortgage valuation but absent from planning records entirely. These gaps exist for several reasons. Owners sometimes carry out works in good faith, believing they fall within permitted development rights — only for a later review to reveal they exceeded the thresholds. Others knowingly skip the process. And occasionally, paperwork simply wasn't filed correctly. The consent gap is what HouseData.uk's PRISM tool is specifically designed to detect. By cross-referencing EPC time-series data (which records floor area and property attributes at multiple points in time) against planning records held by the relevant LPA, PRISM can flag cases where the physical property appears to have changed in ways that don't correspond to recorded consents. It doesn't replace a solicitor's due diligence or a formal planning search — but it surfaces the risk signal early, before it becomes an exchange-day problem. A conveyancer using HouseData's property report on a mid-terrace in Greater Manchester, for example, might see a PRISM consent gap flag on a property where the EPC floor area increased by 22 square metres between 2017 and 2022 but no planning applications appear in the LPA records for that address. That's not proof of a breach. But it's a question worth asking — and asking early, not the week before completion.

Has Planning Permission Been Granted? How to Read the Results When you run a planning search, you'll typically see one of the following statuses: Approved / Permitted — The application was granted, either unconditionally or with conditions. Check the conditions carefully. If conditions haven't been discharged, the permission may be technically defective. Refused — The application was rejected. If works were subsequently carried out anyway, this is a significant red flag. There may be outstanding enforcement action. Withdrawn — The applicant pulled the application before a decision was made. Works may or may not have been carried out without consent. Pending — An active application is under consideration. This can affect your ability to get mortgage approval and may indicate the seller is trying to regularise unauthorised works. Prior Approval / Permitted Development — Some works require a prior approval notification rather than a full application. These should appear on the planning register but may be listed separately. No records found — Either no works were carried out, all works were within permitted development rights (without notification requirements), or the records are incomplete. The absence of a planning application is not the same as permission having been granted. It may simply mean no application was made — whether or not one was required. When Should You Run a Planning Permission Check? The short answer: before you make an offer, or at the very latest before you instruct your solicitor. Most buyers wait until their conveyancer orders a local authority search — which happens after offer acceptance, often weeks into the transaction. By that point, you've had a survey, you may have paid for searches, and you're emotionally invested. That's the worst time to discover a substantial rear extension was built without consent. Running a basic planning check yourself takes ten minutes and costs nothing. Reviewing the EPC history on a property is free through the MHCLG EPC Register. Cross-referencing the two — floor area, room count, any changes between certificates — gives you a reasonable proxy for whether the physical property matches the planning record before you've spent a penny.

What Happens if Planning Permission Wasn't Obtained? Indemnity Insurance For minor planning breaches that are more than four years old (for operational development) or ten years old (for change of use), indemnity insurance is often available. This protects the buyer and lender against enforcement action, but it doesn't regularise the breach. Some lenders won't accept indemnity insurance as a substitute for consent. Retrospective Planning Permission For more recent works, the seller may need to apply for retrospective permission — or a lawful development certificate, which confirms works were permitted development. This takes time, and it may not succeed. Your solicitor should advise on the appropriate route. Walking Away Sometimes the right answer is to walk away. If a property has significant unresolved consent gaps — particularly where works are recent, substantial, or clearly beyond permitted development — the legal risk may simply not be priced into the purchase price.

A Note for Conveyancers Planning compliance sits at the intersection of property law, local authority enforcement, and physical inspection — none of which conveyancers are formally responsible for, but all of which can come back to you if the buyer later claims they weren't adequately warned. Integrating a planning and consent gap review into your standard due diligence process — alongside local authority searches, drainage searches and environmental reports — is increasingly best practice rather than a value-add. HouseData.uk's PRISM-powered property risk report is designed to sit alongside, not replace, your existing search stack. It surfaces the questions worth asking early, so you can advise clients before they're committed, not after.

Summary: What to Do Before Exchange

Run a free planning history check on the Planning Portal for the property address. Review the EPC history on the MHCLG register to check for changes in floor area or room count. Compare both — any divergence between the physical record and planning history is worth investigating. Ask the seller (via their agent or solicitor) to explain any discrepancies. The answer — or the absence of one — is informative. Don't wait for the local authority search to surface planning issues. By then, the clock is against you.

Run a HouseData.uk property risk report before your next transaction. PRISM's consent gap detection flags unauthorised development risk in seconds — giving you the questions that matter, before exchange day. Check your property now at HouseData.uk

FAQ Schema

Q1: How do I check if planning permission has been granted on a property? Search the local planning authority's public register via the Planning Portal (planningportal.co.uk) using the property address or postcode. Results show submitted applications, decisions and conditions. For older records, contact the LPA directly. The search is free and takes around ten minutes.

Q2: What does a planning permission check actually show? It shows whether applications were submitted, approved, refused or are pending. It does not confirm whether approved works were carried out correctly, whether conditions were discharged, or whether works that didn't require a formal application were done within permitted development limits.

Q3: What is a consent gap in property? A consent gap is a discrepancy between a property's physical state and its planning or building control records. Common examples include extensions or loft conversions that appear on EPC floor plans but have no corresponding planning application — indicating works may have been carried out without proper consent.

Q4: Can I buy a property where planning permission wasn't obtained? Yes, but it carries risk. For older breaches, indemnity insurance is often available. For recent or substantial works, the seller may need retrospective permission. Some lenders won't proceed where consent gaps are unresolved. Always take legal advice before exchange.

Q5: How far back do planning records go online? This varies by council. Most LPAs have digitised records back to the 1990s; some go further. For pre-digital records, you may need to request paper copies directly from the LPA, sometimes for a small fee. Absence of records doesn't confirm works were permitted — it may simply mean records aren't digitised.