The email looked harmless enough until the homeowner opened the attachment. The council had not refused the extension itself. They had not even reached the design stage. The application was marked invalid because the uploaded map pack did not clearly identify the site, the detailed plan did not match the wider boundary, and the driveway to the public road had been left outside the red line.
That sequence is more common than most applicants realise. People search for maps for planning permission, buy the first file that sounds plausible, and assume a single PDF will cover everything. In reality, councils usually want a small pack of related maps that answer different questions: where the site is, what sits on it now, and what level of detail is needed to assess the proposal.
This guide is built for that exact buying moment. If you need the quickest route, start with the Ordnance Survey planning maps page and then choose a site location plan and block plan from the same workflow so the boundaries stay aligned.
If you are still deciding which route to buy first, run the Which planning map do I need? tool. If you need help choosing between 1:1250, 1:2500, and 1:500, use the planning map scale chooser.
Need maps for planning permission?
Which maps do you need for planning permission?
The short answer is simple:
- For most householder applications, you need a site location plan at 1:1250
- If there is building work, you also need a block plan / site plan at 1:500
- If an architect, consultant, or surveyor needs editable base mapping, add CAD in DWG or DXF
That is why the safest commercial route for most buyers is a planning map pack rather than trying to guess which single file the council wants.
The reason people get confused is that the phrase "maps for planning permission" is used loosely. Applicants often mean one of four different things:
- The wider context map for the upload portal
- The detailed site plan showing the proposal
- The editable CAD base for the designer
- The full pack containing all of the above
The rest of this guide explains which one applies to your project, what each file must show, and the order in which to buy them.
Fast comparison: which map does what?
| What you are buying | Standard scale | Main purpose | Typical buyer | Buy this when |
|---|---|---|---|---|
| Site location plan | 1:1250 | Shows where the land sits in its wider context | Almost every applicant | The council checklist says "location plan" or "site location plan" |
| Block plan / site plan | 1:500 | Shows the detailed site layout and proposal position | Most applicants with building work | The council wants a detailed site plan or block plan |
| OS CAD planning maps | Usually 1:500 or 1:1250 base coverage | Gives the design team editable mapping | Architects, consultants, surveyors | Someone has asked for DWG, DXF, or editable base mapping |
| Planning map pack | Mixed | Bundles the common planning map outputs | Homeowners who want the safe default | You need both location and block plans and want one aligned order |
For most domestic projects, the correct answer is not "pick one". It is "pick the right pair".
Why most planning submissions need two maps
Planning officers are trying to answer two separate questions before they validate an application:
1. Where is the land?
This is the job of the site location plan. It places the property within the surrounding street pattern, shows the application boundary edged in red, and gives the authority enough context to identify the correct site in its GIS systems.
2. What exactly is changing on that land?
This is the job of the block plan. It zooms in to show buildings, boundaries, access, trees, hardstanding, and the position of the proposed works relative to the site.
Those functions sound similar, but they are not interchangeable. A location plan can identify the correct house without showing the level of detail needed to assess an extension. A block plan can show the detailed layout while still being too zoomed in to identify the site properly on the wider road network.
That is why a typical planning submission for an extension, loft conversion, dropped kerb, outbuilding, or new dwelling needs both files. The maps are companions, not substitutes.
What the site location plan must show
The wider location map is the file applicants most often upload first, because it sounds like the obvious starting point. It is also the document councils are quickest to reject when the basics are wrong.
A planning-compliant site location plan usually needs to show:
- The full application site edged in red
- Any other land owned or controlled nearby edged in blue
- The route from the site to the public highway where relevant
- Enough surrounding context to identify the site clearly
- A north point
- A scale bar
- Licensed Ordnance Survey mapping and copyright wording
For urban and suburban sites, the normal scale is 1:1250. For larger or more rural sites, 1:2500 may be the correct choice if 1:1250 does not show enough context.
The key mindset is this: the location plan is not there to prove the design. It is there to prove the site. If the red line does not capture the full application land, if the map is cropped too tightly, or if the access to the road is excluded, the application can fail before the detailed drawings are even considered.
What the block plan must show
The detailed map is where the proposal starts to make sense to the validation officer and planning officer.
A planning-compliant block plan or site plan typically shows:
- Existing building footprints on the site
- The proposal positioned clearly relative to the existing layout
- Site boundaries, including fences, walls, and hedges
- Access points, parking, and hardstanding
- Trees and nearby features that affect the site relationship
- Neighbouring structures close enough to provide immediate context
- A north point
- A scale bar
- Licensed OS base mapping
For most residential projects, the standard scale is 1:500. On smaller or more technical sites, 1:200 may be requested instead.
This is the map that answers the practical questions:
- How close is the extension to the side boundary?
- Does the driveway still function?
- Is the new outbuilding within the red-line boundary?
- Does the proposal make sense relative to the rest of the plot?
If you only buy a location plan for a project that includes building work, this level of detail will usually be missing.
Fast comparison: which map does what?
When PDF is enough and when CAD or 1:2500 is the smarter buy
Not every buyer needs the same output format.
PDF is enough when:
- You are uploading a straightforward planning submission
- You already have the architectural drawings prepared separately
- You simply need compliant map documents for validation
CAD is worth adding when:
- Your architect wants editable base mapping
- The project is being drawn in AutoCAD, Revit, or similar software
- You want the design drawings and planning maps to come from the same OS base
- The site is awkward, multi-parcel, or likely to change during design development
1:2500 is worth choosing when:
- The site is rural or spread out
- The road context is too limited at 1:1250
- Access crosses a longer driveway or lane
- The nearest named roads are too far away to appear clearly on a 1:1250 sheet
This is where buyers often waste money. They assume the only decision is "location plan or block plan" when the real decision tree is:
- Which map purpose do I need?
- What scale best fits the site?
- Is PDF enough, or does the design team need CAD too?
5 mistakes people make when ordering maps for planning permission
1. Buying only the first map named on the checklist
Applicants see "location plan" and stop there. But if the project includes operational development, the detailed block plan is usually required too.
2. Assuming "site plan" means the same thing as "location plan"
In planning workflows, "site plan" often means the detailed 1:500 plan. It is not just another name for the wider context map.
3. Using the wrong red-line boundary on different files
The boundary on the location plan and the block plan must align. Buying both through the same planning maps workflow reduces that risk immediately.
4. Picking the wrong scale for the site
Urban sites usually want 1:1250 for the wider map and 1:500 for the detailed one. Rural sites may need 1:2500 for context. The scale decision is about clarity, not guesswork.
5. Forgetting about the designer
If an architect later asks for DWG or DXF, it is more efficient to include CAD planning maps at the start than to rebuild the same mapping base twice.
Project scenarios: what should you buy?
Rear extension
Order a site location plan and a block plan. PDF is usually fine unless your designer specifically wants CAD. This is the default homeowner case.
Loft conversion with dormer
You still usually need both maps. The location plan identifies the site; the block plan supports the wider application pack and related roof or layout drawings.
Dropped kerb or driveway changes
The detailed plan matters because access and highway relationship matter. Order the standard pair and make sure the access route to the road is correctly captured.
Garden outbuilding or annex
Again, the standard pair is usually right. The detailed plan helps the authority understand the position of the new structure relative to boundaries and neighbouring properties.
Rural plot or larger site
Start with the broader Ordnance Survey planning maps route, because you may need 1:2500 for the location plan and possibly CAD if multiple parcels or access points are involved.
The safest order flow if you want to get it right first time
If you are unsure what to buy, the lowest-risk route is:
- Start on the Ordnance Survey planning maps page
- Generate the site location plan for the wider context requirement
- Add the block plan for the detailed site requirement
- Add CAD only if your architect or consultant needs editable files
- Check that the red-line boundary is identical across the full pack
That workflow is more commercially sensible than ordering one file, discovering a second requirement later, and then trying to recreate the same boundary from memory.
FAQ: maps for planning permission
Q: What maps are needed for planning permission?
A: For most applications involving building work, you need a site location plan at 1:1250 and a block plan / site plan at 1:500. Larger or rural sites may need 1:2500 for the location plan, and architects may also need CAD.
Q: Do I always need both a location plan and a block plan?
A: If there is building work, that is the safest assumption. The location plan identifies the site; the block plan shows the detailed layout. Some non-operational applications may only need the wider map, but most householder projects need both.
Q: What is the difference between planning maps and architectural drawings?
A: Planning maps identify the site and show the layout at fixed mapping scales. Architectural drawings show the design itself, such as floor plans, elevations, or sections. They work together, but they are not the same documents.
Q: Can I use Google Maps or Land Registry plans instead?
A: Not for a planning submission that needs compliant OS mapping. Councils expect licensed Ordnance Survey base mapping with the proper scale, scale bar, and copyright wording.
Q: Should I buy CAD as well as PDF?
A: Only if the design team needs editable mapping. For a straightforward homeowner submission, PDF is usually enough. If an architect asks for DWG or DXF, add CAD planning maps.
Q: What is the quickest way to buy the right maps?
A: Use a single workflow that lets you create the site location plan and block plan from the same base and boundary, then add CAD only if needed.
Conclusion
If you are searching for maps for planning permission, the safest assumption is that you need a small pack rather than a single file: a site location plan for context, a block plan for site detail, and CAD only where editable mapping is required.
That is exactly why the most practical starting point is the Ordnance Survey planning maps page. It lets you choose the right combination in the right order, keep the red-line boundary consistent, and avoid the classic mistake of buying one map when the council really wants two.
Get the right planning maps for your application today and avoid losing time at validation.