Islington homeowners are often caught off guard. They assume a loft conversion or rear extension falls under permitted development — something you can just do — and then discover, sometimes after work has started, that the rules for their property are nothing like what they expected.
The problem isn't that planning rules are a secret. It's that they vary by borough, by street, and sometimes by individual property. WhatCanIBuild exists precisely to cut through that — showing you what applies to your address, not just the general rules.
The short version
- Islington has extensive Article 4 directions that remove permitted development rights in many areas
- Conservation area status alone doesn't tell you what's allowed — it depends on your specific property
- Most homeowners don't realise their permitted development rights may already have been removed
Article 4 directions — and why they matter more than you think
Permitted development rights let homeowners carry out certain work without applying for planning permission. Most people know this. What they don't know is that a local authority can remove those rights through something called an Article 4 direction.
Islington has issued Article 4 directions across a significant number of its conservation areas. That means work you'd assume is straightforward — a side extension, changes to a window, alterations to a front elevation — can require full planning permission on your street, even if it wouldn't two roads away.
The question isn't whether Article 4 directions exist in Islington. They do. The question is whether your specific property is affected, and what that means for the exact project you're planning. Most homeowners don't realise they need to ask that question until it's too late.
Conservation areas don't all work the same way
Islington has numerous conservation areas — and being inside one changes the rules in ways that aren't always obvious. But here's the part most people miss: not every property in a conservation area faces the same constraints.
Your immediate street, the age of your property, what's already been done to it, what your neighbours have had approved or refused — all of this feeds into how a planning application gets assessed. Knowing you're in a conservation area tells you something. It doesn't tell you what will or won't get approved for your home.
Don't assume your neighbour's extension sets a precedent
What was approved next door isn't a guarantee your project will be treated the same way. Applications are assessed individually, and subtle differences in design, scale, or even when it was submitted can change the outcome.
Listed buildings add another layer entirely
If your property is listed — or if you live in a converted building where some units are and some aren't — the rules change again. Listed building consent is a separate requirement from planning permission, and the thresholds for what triggers it are not where most people expect them to be. Internal work that feels purely cosmetic can require consent. Extensions that look modest from the street can be refused outright.
Islington has a significant number of listed properties, including Georgian terraces across the borough's conservation areas. If there's any chance your property is listed or attached to a listed structure, that's not something to guess at.
What actually applies to your property
The best way to understand your position isn't to read general guidance — it's to check against your specific address. WhatCanIBuild goes beyond telling you which constraints exist on your property. It shows you what's actually been approved and refused for similar projects nearby, what the approval patterns look like for your project type in Islington, and how your particular combination of constraints affects your chances — the things that general articles like this one deliberately can't tell you.
Doing nothing, or assuming your project is fine, carries real risk. Unauthorised work can result in enforcement action, and selling a property with unpermitted alterations creates problems that are expensive to fix.
WhatCanIBuild gives you a clear picture of where you stand before you commit to anything.
These rules vary by property
Conservation areas, Article 4 directions, and other constraints can change everything. Check what actually applies to your address.
Check my address