Stamp duty refund checker
Answer a few questions to see whether you might be owed stamp duty (or Welsh Land Transaction Tax) back, and roughly how much. Free
The main ways to get stamp duty back
Selling your old home within 3 years. If you paid the higher rates because you hadn't sold your previous main home yet, you can reclaim the extra once it sells, as long as you sell within 3 years and claim within 12 months of selling (or 12 months of the return's filing date, if later).
Missed first-time buyer relief (England). You can amend the return within 12 months of the filing date.
Mixed-use purchases are taxed at lower non-residential rates. HMRC and the courts have tightened this, so get advice.
Uninhabitable homes may be non-residential, but the bar is high: needing modernisation isn't enough.
Beware firms that cold-call promising refunds on a no-win, no-fee basis; many claims are rejected and HMRC has warned about them. This tool is a guide, not tax advice. See GOV.UK: apply for a repayment.