If you're submitting a planning application in the UK, one of the first requirements you'll encounter is an Ordnance Survey (OS) map.
But not just any map will do.
Using the wrong type — or the wrong scale — can delay or even invalidate your application.
This guide explains exactly what you need, how to get it, and how to avoid common mistakes.
What Is an Ordnance Survey Map in Planning?
An Ordnance Survey map is a licensed, accurate base map used to create your:
For planning purposes, councils require OS-based maps because they:
- Show accurate boundaries
- Include surrounding context (roads, buildings)
- Meet national validation standards
Why Councils Require OS Maps
Planning officers need to understand:
- Where your property sits in relation to others
- Access points and roads
- Impact on neighbouring land
OS maps provide a standardised, trusted reference.
Required Scale for Planning Applications
There are two main scales used:
1. Location Plan (Required)
- Scale: 1:1250 or 1:2500
- Shows wider area
- Your property outlined in red
2. Block Plan (Often Required)
- Scale: 1:200 or 1:500
- Shows site details and layout
What Must Be Included
Your OS-based plan must include:
- Red line boundary (application site)
- Blue line (other land owned, if applicable)
- Scale bar
- North arrow
- Surrounding roads and buildings
Missing any of these can result in validation failure.
Step-by-Step: How to Get an OS Map for Planning
Step 1: Enter Your Address
Use a professional planning tool (not Google Maps)
Step 2: Select the Correct Plan Type
Choose:
- Location plan
- Block plan (if needed)
Step 3: Draw Your Boundary
- Red line around application site
- Blue line for additional land
Step 4: Download Instantly
Ensure it includes:
- Correct scale
- OS licence
- PDF format
How Much Does an OS Planning Map Cost?
Typical costs:
- Location plan: £10–£30
- Block plan: £15–£40
Buying from a planning-specific provider ensures compliance.
Common Mistakes to Avoid
❌ Using Google Maps
Not accepted by councils.
❌ Wrong Scale
Must be 1:1250 or 1:2500.
❌ Missing Red Line
Your site must be clearly outlined.
❌ Cropped Maps
Must show surrounding context.
Practical Example
If you're building a rear extension:
- Use a 1:1250 location plan
- Mark your house in red
- Include neighbouring properties
- Add a block plan for layout details
FAQs
1. Can I use Google Maps for planning permission?
No — councils require Ordnance Survey-based plans.
2. What scale should I use?
1:1250 (urban) or 1:2500 (rural).
3. Do I always need a block plan?
Not always, but most applications require one.
4. How long does it take to get a plan?
Instant download from online providers.
5. What happens if my plan is wrong?
Your application may be rejected or delayed.