Verified: 8 March 2026 06:16 am UK Time
Industry: Building Society and Financial Services
Jurisdiction: United Kingdom
Primary Regulators: Financial Conduct Authority (FCA) & Prudential Regulation Authority (PRA)
Important Safety Warning: Beware of fake customer service numbers on search engines. Only use official channels. Scammers frequently buy ads to promote fraudulent phone numbers. Nationwide staff will never ask for your account PIN, your online banking password, or ask you to move money to a “safe account” over the phone.
Level 1: Customer Support (Initial Complaint)
-
How to complain: You can raise a complaint directly through the secure messaging feature in the Nationwide mobile app, by visiting a branch, or by calling their official, dedicated complaints routing number.
-
Dedicated Complaints Line: 0800 30 20 15 (Freephone)
-
Calling from Abroad: +44 1793 65 67 89
-
Source Verification Note: Nationwide Make a Complaint
-
Availability: The complaints team is available Monday to Saturday: 8am - 8pm, and Sunday: 9am - 5pm (UK Time). Fraud and lost/stolen card reporting lines are open 24/7.
-
Timeline: Under FCA rules, Nationwide must send a Summary Resolution Communication if they resolve the issue within 3 business days. If not, they must formally acknowledge the complaint in writing.
Level 2: Formal Corporate Escalation (Notice of Dispute)
-
Who to contact: If customer service cannot resolve the issue, you must formally escalate it to their central complaints handling team. Send a written letter detailing your account information, a timeline of the issue, and your desired resolution. Sending this via Royal Mail Signed For is highly recommended to prove receipt.
-
Complaints Administration: Member Services, Nationwide Building Society, Kings Park Road, Moulton Park, Northampton, NN3 6NW
-
Legal Headquarters (for formal legal notices): Nationwide House, Pipers Way, Swindon, SN38 1NW
-
Source Verification: Nationwide Corporate Information
-
Timeline: * Payment Services: If your complaint is regarding a payment, transfer, or unauthorized transaction, FCA rules state Nationwide must issue a Final Response Letter within 15 business days (extendable to 35 days only in exceptional circumstances).
-
General Complaints: For all other issues (loans, mortgages, customer service), Nationwide has up to 8 weeks to issue their Final Response Letter.
Level 3: Regulatory Authority (Government Ombudsman)
-
Authority: Financial Ombudsman Service (FOS)
-
Portal/Contact: The FOS is the UK’s official, free dispute resolution service for financial complaints. You can submit a complaint online or by email:
-
Website: financial-ombudsman.org.uk
-
Phone: 0800 023 4567
-
Timeline (CRITICAL): You can only refer your complaint to the FOS after you receive a Final Response Letter from Nationwide, OR if they have missed their 15-day / 8-week legal deadline to provide one. You must escalate the complaint to the FOS within 6 months of the date printed on your Final Response Letter.
Level 4: Legal Action (Final Step)
- Pre-Litigation: Before commencing legal proceedings, UK legal protocols require you to send a formal “Letter Before Action” (LBA) to Nationwide’s legal department at their Swindon headquarters. This letter must outline your claim, the exact legal or contractual breach, the evidence, and the financial remedy you seek, giving them a final 14 to 30 days to settle.
- Court: If the LBA fails and the Ombudsman cannot resolve it, you can file a lawsuit. For financial claims up to £10,000 in England and Wales, you can use the Money Claim Online (MCOL) portal to enter the Small Claims Track. For complex claims or those exceeding £10,000, you will likely need to instruct a solicitor and proceed to the County Court or High Court.
- Source Verification: Make a court claim for money (GOV.UK)
Community Action: Is Nationwide still ignoring your frozen account or unauthorized transaction dispute? Reply below (do not share your passwords, full account numbers, or PINs), and our community will point you to the right FOS complaint templates!