Side Extension Across Greater London
Use this page to compare the local authority layer for side extension across Greater London, find the councils worth checking first and open the rule pages that usually change the answer.
Read This Area Project Page In The Order That Saves You Time
What This Area Project Page Is For
What usually applies
Start with the local page for the council area you care about, because the national baseline is only half the answer once local restrictions matter.
What often changes it
Conservation areas, Article 4, listed buildings, local design expectations and the exact dimensions of the scheme can all change the route.
Best next step
Compare the 33 council areas below, then open the local project guide and the rule page that looks most likely to decide the answer for your site.
When This Area Comparison Usually Helps And When You Should Go Straight To A Local Page
Usually enough for a first pass when
- You are still comparing councils and have not narrowed the project to one site-specific route yet.
- The uncertainty is about where side extension feels more sensitive rather than whether one exact drawing already works.
- You want to understand the likely local pressure points before paying for more detailed design work.
Go more local when
- One council area, one conservation area or one exact property constraint is already doing most of the work.
- The scheme is close to a height, boundary, roof or visibility limit.
- You need a reliable route decision rather than a comparison-led briefing.
What usually settles it faster
- Open the matching local project guide for the correct council below.
- Pair it with the rule page that looks most likely to block or change the route.
- If the scheme is borderline, move to measured drawings and written confirmation rather than relying on comparison alone.
Side Extension Topics Worth Checking Across Greater London
Planning Permission
Useful when planning permission is the question most likely to change the answer for side extension in places like Barking and Dagenham.
Open topic hubPermitted Development Rights
Useful when permitted development rights is the question most likely to change the answer for side extension in places like Barnet.
Open topic hubHeight Limits
Useful when height limits is the question most likely to change the answer for side extension in places like Bexley.
Open topic hubBoundary Distance Rules
Useful when boundary distance rules is the question most likely to change the answer for side extension in places like Brent.
Open topic hubConservation Area Restrictions
Useful when conservation area restrictions is the question most likely to change the answer for side extension in places like Bromley.
Open topic hubHow The Same Project Can Feel Different Across One Planning Area
Planning rules for side extension in Greater London still sit on the same national baseline, but the confidence you can place in that baseline changes once local designations, property context and authority interpretation enter the picture.
This area hub is designed to make that local layer easier to compare before you commit to one planning route.
What Usually Deserves A Closer Look In Greater London
- Urban and heritage-sensitive authority areas often feel stricter even where the national rule sounds similar.
- Projects close to a boundary, roof limit or visual-impact threshold are more likely to need a careful local check.
- Where the local route still feels uncertain, comparing one or two neighbouring councils often clarifies the real issue.
What To Do If You Still Need A Faster Answer
Build a cleaner prep pack
Use the project requirements generator when you want the documents, checks and follow-up work arranged in a safer order.
Build prep packRun the quick planning tool
Use the main planning decision tool when you need a first steer before comparing the local pages in detail.
Open toolAnalyse the likely refusal risks
Use the risk analyzer when the proposal is taking shape and you want to stress-test the main reasons it could be refused.
Open analyzerSee the wider Greater London planning hub
Use the area page to switch from this project to broader council and topic navigation.
Open area hubRead the core planning permission answer
Open the FAQ when the uncertainty is still about the overall route rather than the local layer.
Read answerMore Area Comparisons And Related Follow-Ups
Use these only after the local authority route and main next steps above. They are helpful, but they should not compete with the primary answer.
Show more rule comparisons, nearby area hubs and related project alternatives
Rule Pages That Usually Decide The Next Step
Nearby Area Project Hubs
Bedfordshire
Compare side extension guidance in Bedfordshire when you want broader local context.
Compare areaBerkshire
Compare side extension guidance in Berkshire when you want broader local context.
Compare areaBuckinghamshire
Compare side extension guidance in Buckinghamshire when you want broader local context.
Compare areaCambridgeshire
Compare side extension guidance in Cambridgeshire when you want broader local context.
Compare areaCornwall
Compare side extension guidance in Cornwall when you want broader local context.
Compare areaCounty Durham
Compare side extension guidance in County Durham when you want broader local context.
Compare areaCumbria
Compare side extension guidance in Cumbria when you want broader local context.
Compare areaDerbyshire
Compare side extension guidance in Derbyshire when you want broader local context.
Compare areaHow To Use This Area Project Guide Responsibly
What this page is for
This page helps you compare side extension planning permission guidance across Greater London so you can identify which local authority path, rule page and verification step deserve attention first.
What it does not replace
It does not replace the council-specific project guide, the exact property checks or any formal confirmation needed for a borderline scheme.
How the guidance is built
The comparison sits on the same English planning system baseline across the area, then focuses on the local authority differences most likely to change the route in practice.
When to stop relying on broad guidance
Stop relying on area comparison alone once one council, one conservation-area issue, one Article 4 question or one measured threshold is clearly doing most of the work.
Safest formal next step
Open the matching local project guide first. If the route still looks borderline, move to measured drawings and then to a lawful development certificate, pre-application advice or another formal check as needed.