No. Sui generis isn't a use class—it's a label for uses that don't fit any standard class.
What’s Happening
Sui generis is a catch-all term for land or buildings that don't fit standard UK planning use classes.
You’ll see it everywhere from planning applications to property deeds. It’s not an error—just the planning system’s way of saying, “This one’s special.”
Think of it like trying to sort Lego bricks. Most fit neatly into standard boxes (retail, industrial, residential). But some pieces? Too weird. Those get tossed into the “sui generis” bin. In UK planning law, that includes places like theatres, nightclubs, laundrettes, petrol stations, scrap yards, and even pubs serving expanded food menus.
The key factor isn’t just what the place does—it’s whether it refuses to squeeze into standard classes like Class A (retail), Class B (industrial), or Class C (residential). If it can’t fit, it gets tagged sui generis.
Step-by-Step Solution
Confirm your property’s use class through these four steps.
Need to check if your property’s classified as sui generis or change that classification? Here’s where to start:
- Pull up the local authority’s planning register. Head to your council’s website and pop your address into the planning portal. The “All Applications” section will show the current use class. If it says “sui generis,” you’ve got your answer.
- Pinpoint the exact sui generis use. Common ones include Class JA (launderettes), Class A4 (pubs/wine bars), and standalone nightclubs. Each comes with different rules about when you’ll need fresh planning permission.
- Decide if you need to switch uses. Changing from one sui generis use to another (say, a laundrette to a takeaway)? You’ll likely need new planning permission unless it’s a minor tweak. Moving to a standard class (like Class A1 retail)? Almost always requires permission.
- Submit a planning application if needed. Use the Planning Portal to apply. Pick “Change of use” and specify the new class. Include site plans and a description. Councils have 8 weeks to decide.
If This Didn’t Work
Try these three alternatives if your planning attempts stall.
Still hitting walls? These options might help:
- Look for prior approvals. Some changes within the same sui generis use (like expanding a pub’s kitchen) may qualify for “prior approval” under the General Permitted Development Order 2026. Check the GOV.UK guidance to see if your project fits.
- Fight a refusal with an appeal. Got rejected? You can appeal to the Planning Inspectorate within 6 months. Make sure your appeal clearly shows how your proposal follows local and national policies.
- Get a certificate of lawful use. Unsure if your current use is legal? Apply for a Certificate of Lawful Existing Use or Development. This confirms whether your sui generis use is recognized and can protect you from enforcement action.
Prevention Tips
Follow these four steps to avoid planning headaches before they start.
Want to dodge planning nightmares? Check these boxes first:
- Always verify the use class. Before signing a lease or buying, ask the seller or agent for the latest planning decision notice. Look under “Proposed/proposed not in accordance” for the use class.
- Keep your use consistent. Running a nightclub? Switching to a bar is fine. Turning it into a warehouse without permission? That’s asking for trouble.
- Watch local planning updates. Since 2020, Class E has swallowed many mixed uses. Some things that used to be sui generis (like health centres) now fall under Class E, making future changes easier.
- Talk to the council early. Got a complex project? Chat with the planning officer before submitting. That pre-application advice can shave months off your timeline.
