A single wrong digit in a postcode or a missing house number can turn a paid order into a returned parcel, an angry customer and a support ticket. The fix is simple: never let an invalid address into your system in the first place.
Stop the problem at source
- Validate every address against Royal Mail PAF as it's entered
- Autocomplete so customers pick a real, deliverable address
- Catch typos, missing fields and invalid postcodes instantly
- Fewer returns, redeliveries and carrier correction surcharges
- Cleaner data flowing into fulfilment and your CRM
Where to add it
Add validation to your checkout, Shopify or WooCommerce store, CRM forms and internal tools using the UK address validation API.
Get started
Book a demo or start a free trial and cut your failed deliveries this quarter.
Frequently asked questions
What causes failed deliveries?
The biggest cause is inaccurate or incomplete address data — typos, missing details and invalid postcodes entered at checkout or in forms. Validating addresses against Royal Mail PAF at the point of entry removes most of them.
How does address validation prevent failed deliveries?
By checking every address against the official Royal Mail Postcode Address File before an order is placed, so only real, deliverable addresses enter your system.
How much do failed deliveries cost?
Estimates put the cost of failed UK deliveries in the billions annually, with each failed delivery costing a business £12 or more in redelivery, support and refunds.
Ready to get started?
Add Royal Mail PAF-verified UK address lookup to your site in minutes — start free, no card required.