Shipping costs aren't just about carrier rates — they're driven by how often deliveries succeed first time. Bad addresses quietly erode that, adding redelivery, return and surcharge costs to every affected order.
Where the costs come from
How to protect margins
- Verify addresses against PAF at checkout
- Use postcode lookup so customers select valid addresses
- Standardise formatting for accurate labels
- Catch undeliverable inputs before dispatch
Start saving
Add UK address verification and read how to reduce failed deliveries. Back to the checkout hub.
Frequently asked questions
How does address accuracy affect shipping costs?
Inaccurate addresses cause failed first-time deliveries, redeliveries and returns — each adding cost. Verifying addresses at checkout keeps first-time delivery rates high and costs low.
What is first-time delivery rate?
It's the share of parcels delivered successfully on the first attempt. PAF-verified addresses raise this rate by eliminating bad-address failures.
Can accurate addresses lower carrier surcharges?
Yes — many carriers apply address-correction surcharges for invalid or incomplete addresses, which verification helps you avoid.
Ready to get started?
Add Royal Mail PAF-verified UK address lookup to your site in minutes — start free, no card required.