Ikea is launching a peer-to-peer secondhand marketplace in the UK this week and piloting an online version of its furniture buy-back scheme in Spain and Portugal. The retailer already runs in-store buyback in the UK, offering vouchers for returned furniture. The online extension would dramatically widen reach. Ikea predicts pre-owned goods will grab 16% of the UK homewares market by next year. The marketplace lets Ikea membership holders buy and sell used Ikea products directly to one another — free at launch, but with a 5% buyer protection fee coming. Ikea sweetens seller participation by offering a 15% bonus on sale price if you take payment as an Ikea gift card. Pre-filled product descriptions and suggested pricing reduce friction. Buyers and sellers arrange their own logistics for now. The strategic logic is transparent. The UK secondhand home products market is worth over £4.5bn and growing at 6.5% annually. Ikea products already account for about 9% of furniture sold on UK resale platforms. That value currently flows to Vinted, eBay, Facebook Marketplace, and Gumtree. Ikea wants it back — and wants to convert resale revenue into future Ikea purchases via gift card incentives. This is a closed-loop recapture strategy dressed in sustainability language. The buy-back vouchers and the 15% gift card bonus are not generosity — they are customer retention mechanisms that ensure resale value stays within the Ikea spending orbit. Every used Kallax shelf sold through the marketplace is a customer who didn't go to Vinterior. Every voucher is a future new-product purchase. The competitive landscape is real. Vinted is expanding from clothing into homewares. eBay bought Depop for $1.2bn. AO acquired MusicMagpie and Jessops. Currys sells pre-owned goods. The secondhand economy is no longer niche — 63% of UK consumers bought through resale platforms in 2025, up from 51% in 2024. Ikea is late to the platform game but has a structural advantage: it already knows every product specification and can pre-populate listings that competitors cannot. The environmental story is secondary to the commercial one. Extending furniture life cycles is genuinely good. But the primary function here is market defense — preventing value leakage to third-party platforms — and ecosystem lock-in through gift card conversion. The 5% buyer fee, once introduced, creates a revenue stream on transactions Ikea previously received nothing from. If this model succeeds, expect every major retailer with standardised product catalogues to follow. The template is clear: own the resale layer, capture the margin, convert secondhand transactions into first-party spending. The open question is whether consumers will choose a walled-garden marketplace when open platforms offer broader selection and no membership requirements.