The Contract Price Promise, in plain English
- Your broadband price is fixed for your entire contract. Sign at £34/month for 24 months and you pay £34/month for 24 months. No CPI, no RPI, no “+£3 every April”. It applies to all of Zen's current broadband packages — Zen's own wording is here.
- Zen estimates the saving at up to £108 over 24 months versus providers that apply two annual in-contract rises. That maths checks out against the ~£3–£3.50/month annual increases BT, EE, Vodafone, Sky and Virgin Media currently write into their contracts.
- It also changes the comparison maths. A rival deal that starts £4/month cheaper than Zen can end up costing about the same across a full 24-month term once its two birthday rises land — always compare total contract cost, not month one.
What the promise doesn't cover
- Out of contract, prices can rise — with at least 30 days' written notice (for customers who joined after June 2022). Set a reminder for your contract end date and either re-sign or renegotiate; drifting out of contract is where everyone's broadband gets expensive.
- Add-ons follow their own pricing (digital voice calls, EveryRoom mesh). The fixed-price promise is about your core broadband subscription.
- The older “Price for Life” guarantee — if you signed up before 31 May 2022 you may still hold Zen's legacy lifetime price promise, which is even stronger. New sign-ups get the Contract Price Promise instead.
How the big providers compare
As of 13 September 2026: BT, EE, Plusnet and Vodafone write a fixed £3/month annual increase into their contracts; Sky applies its own annual increase; Virgin Media typically £3.50/month. Ofcom banned the old inflation-linked percentage rises, but fixed-pound rises are still standard practice everywhere — except at the handful of fixed-price providers, of which Zen is by far the most decorated. See the full head-to-heads: Zen vs BT, Zen vs Sky, Zen vs Plusnet, Zen vs Virgin Media, Zen vs Vodafone and Zen vs EE.
One more saving on top
If fixed pricing is what brings you to Zen, remember the £40 referral eGift card for new broadband customers — used before you order, it's effectively another month-and-a-bit free on most packages.