10% off first orders with WELCOME10, spice blends under £3.99 and free UK delivery over £35 — reviewed by Martha-Grace.
New customers get 10% off their first order at Costack Spices with code WELCOME10. Premium spices and seasonings, 20 bold blends, 4.6 stars from 1,000+ reviews.
Plus weekly flavour tips for British home cooks. No spam.
19 bold blends. From Sunday roasts to weeknight curries. Most blends gluten-free. Free UK delivery over £35.
Discover Costack's monthly spice subscription boxes, packed with bold seasoning blends and a free recipe eBook.
Pick your own blends and build a custom Costack box.
Sunday roasts. Weeknight curries. BBQ nights. Every bundle includes the free recipe ebook. Free UK delivery on orders over £35.
Looking for a Costack Spices discount code, voucher code or promo coupon? On 1 November 2026 VouchersX lists one live code — WELCOME10, 10% off your first order, listed to 28 February 2027 — alongside five no-code deals: 10% off your first order via the newsletter (with weekly flavour tips), blends under £3.99 built for British home cooks, the monthly spice subscription boxes with a free recipe eBook, the build-your-own spice box, and free UK delivery over £35, dispatched in 24 hours. All six listings were checked on 2 November 2026.
The arithmetic on this page is different from most — a single 10% code, and the real money sitting in the £35 free-delivery line and the size of your first basket. This guide works out how to make a first-order-only code pay, when the subscription beats single blends, and why the weeks before Christmas are this brand's natural sale window.
Costack Spices is a UK seasoning brand with one audience in mind: the British home cook. The catalogue runs to around 20 bold blends — from Sunday roast rubs to weeknight curry seasonings and BBQ mixes — most of them gluten-free, priced under £3.99 a blend, with refill pouches for the ones you finish first.
The model is direct and simple. Every bundle includes a free recipe eBook; delivery is free over £35 and dispatched within 24 hours; the store carries 4.6 stars from more than 1,000 reviews; and two structured routes sit alongside the single blends — the monthly spice subscription box, and the build-your-own box for picking your own line-up.
| Offer | Saving | Code | Listed expiry |
|---|---|---|---|
| 10% off your first order | 10% | WELCOME10 | 28 February 2027 |
| Offer | Saving | How to claim | Listed expiry |
|---|---|---|---|
| 10% off your first order + weekly flavour tips | 10% | Newsletter signup | 30 March 2027 |
| Blends built for British home cooks | Blends under £3.99 | Reduction in shelf price | 22 March 2027 |
| Monthly spice subscription boxes | Box + free recipe eBook | Subscription route | 31 March 2027 |
| Build your own spice box | Custom box pricing | Pick your blends | 30 March 2027 |
| Free UK delivery over £35 | Delivery cost, 24-hour dispatch | Applied at checkout | 31 March 2027 |
All listings reviewed 2 November 2026 by Martha-Grace, VouchersX Deals Editor. Listed expiry dates are VouchersX listing dates, not retailer-confirmed end dates.
Make the first order the big one. WELCOME10 works once — on your first order — and 10% scales with the basket. Burn it on a single £3.99 blend and you have saved forty pence; point it at a £40 build-your-own box and you save £4 and clear the £35 free-delivery line in the same basket. First-order codes reward shoppers who arrive with a list.
Work the £35 line deliberately. Free delivery over £35 is the biggest guaranteed saving on the page — the difference between paying carriage and not. At under £3.99 a blend, the threshold is roughly nine blends; if your basket sits at £31, one more blend takes £3.99 of goods and removes the delivery charge. Price the top-up against the delivery fee before checkout.
Compare the subscription against your real usage. The monthly box with its free recipe eBook suits kitchens that run through seasoning — curry weeks, BBQ summers, roast winters. If your spice rack turns over slowly, single blends plus refill pouches will beat a monthly commitment. Honest rule: subscribe to what you already finish.
Check the gluten-free label per blend. Most Costack blends are gluten-free, but cooking for a coeliac at Christmas is not the moment to discover the exception. The blend pages state it individually — a ten-second check that protects the whole meal.
Buy the Christmas kitchen before December. Costack's calendar peaks with British cooking: roasts, baking, mulled spice. Dispatch is within 24 hours, but December carrier volumes are not — ordering the winter blends in November protects the Christmas kitchen and lands before the rush. The full event calendar is in our Black Friday 2026 UK guide.
| Offer | Was | Expired |
|---|---|---|
| WELCOME5 — first-order code | 5% off | 31 August 2026 |
| SPICE5 — sitewide code | 5% off | 15 September 2026 |
| Summer BBQ event | 15% off BBQ blends | 31 August 2026 |
| Launch code | 15% off first order | 30 June 2026 |
| Christmas blends event | 20% off selected blends | 31 December 2025 |
| Free delivery over £25 | Delivery cost | 31 July 2026 |
| Bundle deal — 3 blends for £10 | Bundle saving | 30 September 2026 |
Recently expired offers stay visible as evidence of what Costack Spices has run before — often the best guide to its next promotion.
Kitchen and pantry shopping crosses categories: shoppers also compare Black Bee Honey discount codes for raw honey and pantry staples, Nutrition Geeks discount codes for supplements, and Collaglo discount codes for wellness routines.
Beyond the kitchen, the site's biggest pages include Dyson discount codes and SharkNinja discount codes for home appliances, and ASOS discount codes and Adidas discount codes on the fashion side.
Every current offer sits in a live category — see the health and beauty category for wellness and self-care, the fashion category for apparel, the electronics category for tech, and the furniture category for the home.
Martha-Grace, VouchersX Deals Editor, November 2026