Storage st

Storage account naming convention

The CAF abbreviation for Storage account is st. Names can be 3 to 24 characters long and allow lowercase alphanumerics only. The name must be globally unique across all of Azure.

Naming rules

CAF abbreviation	st
Length	3 to 24 characters
Allowed characters	Lowercase letters and numbers
Scope of uniqueness	Global (must be unique across all of Azure)
CAF pattern	st{workload}{environment}{region}{instance}

Worth knowing: Globally unique name. Lowercase alphanumeric only (no hyphens).

Rules follow Microsoft's resource naming rules and CAF abbreviations. Some resource types have extra start/end character restrictions, so verify against the official docs before locking in a convention.

Example names

Generated by the same engine as the name generator, so length and character rules are already applied.

Scenario	Generated name	Length
Payments API, production	`stpaymentsprodeus001`	20/24
Web app, development	`stwebappdevweu002`	17/24
Analytics with company prefix	`stanalyticsstageuks001` Dropped company to fit the 24-char limit.	22/24

Naming in Terraform and Bicep

Build the name from variables so one module produces the right name in every environment. The 24-character limit is enforced in the expression.

Terraform

locals {
  storage_account_name = substr(lower("st${var.workload}${var.environment}${var.region}001"), 0, 24)
}

Bicep

var storageAccountName = take(toLower('st${workload}${environment}${region}001'), 24)

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Related Storage resources

rgd Azure Backup Resource Guard bvault Backup Vault bkpol Backup Vault policy share File share sss Storage Sync Service

See the full list of Azure resource naming rules or read the complete CAF naming guide.