What Is OS MasterMap and Why Do Planning Applications Require OS MasterMap?

What Data Does OS MasterMap Contain?

Ordnance Survey MasterMap is the most detailed and accurate digital mapping dataset available for Great Britain. It is widely used by architects, planners, engineers, developers and utility companies who need reliable geographic data for design, planning and infrastructure projects.

Unlike traditional printed maps, OS MasterMap is a dynamic database of geographic features. It contains millions of individual objects that represent the real world. Every building, road, pathway, fence, water feature and boundary is mapped and stored as a separate feature with its own unique identifier.

This object based structure allows professionals to analyse and manage mapping data at a very detailed level.

The core dataset most commonly used in planning and development is the OS MasterMap Topography Layer. This layer includes:

• Buildings and structures

• Roads, tracks and paths

• Property boundaries

• Walls, fences and hedges

• Rivers, lakes and drainage features

• Land parcels and surface types

  
  

Because the data is maintained by Ordnance Survey directly, it is updated regularly to reflect changes on the ground.

Topography, Building Heights and Unique Feature IDs

One of the biggest advantages of OS MasterMap is the level of detail it provides.

Each mapped feature is assigned a TOID (Topographic Identifier). This unique reference number allows organisations to link geographic data with other datasets such as asset management systems, planning records or infrastructure information.

For example a local authority can link building records or planning permissions directly to the mapped building footprint.

Some MasterMap datasets also include additional attributes such as:

• Feature classification

• Land use categories

• Building height information

• Surface types

  
  

This level of structured data is why MasterMap is commonly used in GIS systems and engineering software.

For professionals working in CAD or BIM environments, MasterMap data can be supplied in formats such as DWG, DXF, GML or GeoPackage, allowing it to integrate directly into design workflows.

Who Uses OS MasterMap and Why?

OS MasterMap is used across a wide range of industries.

Architects and planning consultants use the data to produce location plans and block plans for planning applications. Local authorities often require these plans to be based on licensed Ordnance Survey mapping to ensure accuracy and consistency.

Civil engineers rely on MasterMap as a base mapping layer when designing roads, drainage systems and infrastructure. The detailed representation of buildings, boundaries and transport networks helps engineers understand site constraints early in the design process.

Utility companies use the data to support asset management and network planning, linking infrastructure records to mapped features.

Property developers also rely on MasterMap when assessing new sites. Accurate mapping helps identify access routes, neighbouring properties and land boundaries before development begins.

Why Accurate Mapping Matters for Planning

Planning applications in the UK typically require two types of maps:

• A location plan at a scale of 1:1250 or 1:2500

• A block plan at a scale of 1:500

  
  

These plans must clearly show the site boundary and surrounding context. Because OS MasterMap is the most detailed national mapping dataset available, it forms the foundation for many planning drawings.

Using accurate base mapping helps avoid planning delays caused by incorrect site boundaries or missing features.

Accessing OS MasterMap Data

Professionals can access OS MasterMap data through licensed resellers, such as ourselves. When ordering mapping data it is important to select the correct area of interest and the correct file format for your software. For planning drawings this is often PDF or DWG. GIS users may prefer GML or GeoPackage formats.

Our platforms allow users to select a site area, choose the required dataset and download the mapping instantly.

Final Thoughts

OS MasterMap remains the most detailed and authoritative mapping dataset available for Great Britain. Its object based structure, high positional accuracy and regular updates make it essential for planning, engineering and development work.

Whether you are preparing a planning application, designing infrastructure or analysing a new development site, reliable mapping data forms the foundation of every successful project.