Most failed deliveries trace back to one root cause: a bad address entered at checkout. Catching that at the source — before the parcel is picked, packed and shipped — is the cheapest possible fix.
What goes wrong without verification
How to stop it
- Use postcode lookup so customers select real addresses
- Verify against Royal Mail PAF before order confirmation
- Standardise and format addresses consistently
- Flag undeliverable inputs before fulfilment
Get verified addresses
Add UK address verification and explore the wider impact in shipping accuracy & costs. Back to the checkout hub.
Frequently asked questions
How do I reduce failed deliveries?
Verify addresses against Royal Mail PAF at the point of entry so orders only ship to real, correctly formatted addresses — preventing the bad-address errors behind most failed deliveries.
What causes failed deliveries?
Common causes include mistyped or incomplete addresses, wrong postcodes and non-existent properties — most of which address verification catches at checkout.
How much do failed deliveries cost?
Each failed delivery adds redelivery, return and support costs, plus lost customer goodwill. Preventing them at checkout is far cheaper than fixing them later.
Ready to get started?
Add Royal Mail PAF-verified UK address lookup to your site in minutes — start free, no card required.