Section 21 of the Housing Act 1988 let a landlord recover possession without giving a reason. It ended for new tenancies on 1 May 2026, and the deadline for starting court proceedings on a notice served before that date was 31 July 2026. That date has passed. Every remaining section 21 notice has lapsed and cannot be relied on.
Possession now runs entirely through Section 8 of the Housing Act 1988 — and section 8 has never been a formality.
What changed, precisely
Section 21 required a valid notice, a protected deposit, prescribed information, a gas certificate, an EPC and the How to Rent guide. Get those right and the court had no discretion: possession followed.
Section 8 requires a ground. You must name it, prove it, and give the notice period that ground carries. Some grounds are mandatory — prove them and the court must order possession. Others are discretionary, and the judge decides whether it is reasonable.
That is the real change. Not "you can no longer evict", but "you can no longer evict without a reason you can evidence in front of a judge".
The grounds landlords actually use
Ground 8 — serious rent arrears (mandatory)
At least three months' arrears — thirteen weeks where rent is weekly or fortnightly — at both the date of the notice and the date of the hearing. Four weeks' notice.
The double test is where claims fail. A tenant who pays enough to drop below the threshold on the morning of the hearing defeats the mandatory ground, even if they were months behind when you served. Grounds 10 and 11 (some arrears, persistent late payment) remain available but are discretionary.
Grounds 1 and 1A — moving in, or selling (mandatory)
Four months' notice. Neither can be used in the first twelve months of a tenancy, and both carry a twelve-month restriction on re-letting afterwards. Recovering possession to sell and then quietly re-letting is precisely what that restriction exists to prevent.
Ground 14 — anti-social behaviour (discretionary)
Proceedings can begin immediately, but discretionary means the judge weighs it. Contemporaneous evidence — dated logs, correspondence, police or council references — is the difference between an order and a wasted hearing.