# Release Notes

## [OS MasterMap Topography Layer – Building Height Attribute – April 2026 release note](https://docs.os.uk/os-downloads/products/buildings-and-infrastructure-portfolio/os-mastermap-topography-layer-building-height-attribute/release-notes/april-2026)

This release note provides information about the April 2026 release of OS MasterMap Topography Layer – Building Height Attribute product.

## [OS MasterMap Topography Layer – Building Height Attribute – October 2025 release note](https://docs.os.uk/os-downloads/products/buildings-and-infrastructure-portfolio/os-mastermap-topography-layer-building-height-attribute/release-notes/october-2025)

This release note provides information about the October 2025 release of OS MasterMap Topography Layer – Building Height Attribute product.