Standard Singapore address structure
Singapore addresses usually combine a block or building line, street name, unit number when needed, and a six-digit postal code.
Use a six-digit postal code field.
Allow unit numbers such as #08-12 for HDB, condo, and office addresses.
Keep building or block information separate when your form supports it.
What to test in forms
Singapore forms often fail when unit numbers, block labels, or postal codes are treated like US-style ZIP fields.
HDB block and unit number formatting.
Long mall, tower, or condo names.
Checkout flows where postal code drives shipping or tax rules.