Section 21 lapsed on 31 July: what happens now costs 27 weeks

You served the Section 21 notice back in the spring, filed the paperwork away, and told yourself you'd sort out the court claim once the arrears got serious enough to justify the hassle. Then summer got busy, three properties don't manage themselves, and the mortgage on the difficult one kept coming out regardless of whether the rent did. That put-it-off decision now has a use-by date attached to it. If a claim wasn't actually issued at court by 31 July, the notice you were relying on is gone, and you're back to square one on a property that's already been costing you money for months.

That's not a small technicality. Landlords who let a Section 21 notice lapse now face a median 27-week wait from a fresh court claim to actually getting possession back (Ministry of Justice, Mortgage and Landlord Possession Statistics, October to December 2025), on top of court and legal costs that have risen alongside a wider Renters' Rights Act compliance bill already running at a median £5,000 across the sector (Handelsbanken landlord survey via PropertyWire, 24 July 2026). Run those numbers against a fairly ordinary Yorkshire buy-to-let, and a single stuck tenant can wipe out years of the thin margin Section 24 already leaves you with.

What actually happened on 31 July

The Renters' Rights Act abolished Section 21 "no-fault" evictions for new notices from 1 May 2026, but it gave landlords who had already served a valid Section 21 notice before that date a transition window. Any of those pending notices had to result in a possession claim actually issued at court by 31 July 2026, the backstop deadline, or the notice would lapse (Renters' Rights Act 2025 transition provisions, via Burges Salmon and Osbornes Law). Crucially, it's the court issuing the claim that counts, not simply posting the form or instructing a solicitor, and given typical court processing times, anyone who left it until late July was already cutting it fine.

If your notice lapsed, the assured shorthold tenancy it was trying to end has already converted automatically to an assured periodic tenancy, and there's no way to revive the old notice or reissue a fresh Section 21, because that route no longer exists. You start again from Section 8 of the Housing Act 1988, which means picking a specific statutory ground, such as serious rent arrears, antisocial behaviour, or a genuine intention to sell, and serving an entirely new notice before you can even apply to court.

So if you're not certain whether your solicitor or letting agent actually got a claim form issued and stamped by the court before 31 July, rather than merely posted or sat in an inbox, check that today, because it's the difference between being partway through a possession case and starting completely from scratch.

The maths on a stuck tenant, on a fairly ordinary Yorkshire buy-to-let

Take a single rental property in Yorkshire and the Humber at the regional average price of £249,000 (ONS / Land Registry UK House Price Index, May 2026). The region is one of six across England and Wales still averaging above an 8% gross rental yield, at 8.7% (Fleet Mortgages Q2 2026 Rental Barometer), which puts annual rent at £21,660, or £1,805 a month. Financed at 75% loan-to-value with the average buy-to-let fixed rate of 5.42% (Moneyfacts, 1 July 2026), that's £186,750 borrowed on an interest-only basis, costing £844 a month, £10,124 a year.

Strip out a 12% management fee (£2,599), a month's void allowance (£1,805), landlord buildings insurance at the NimbleFins 2026 median of £226, and a 1%-of-value maintenance reserve (£2,490), and you're left with £14,540 a year in profit before mortgage interest, a net yield of 5.84%. After the mortgage interest, that's a cash flow of £4,416 a year, £368 a month, before tax.

Then Section 24 does its work. Because mortgage interest can't be deducted as an expense, a basic-rate taxpayer pays 20% on the full £14,540 and claims a 20% credit on the £10,124 of interest, a net tax bill of £883, leaving £3,533 a year, £294 a month. A higher-rate taxpayer pays 40% on the same £14,540 and gets the same 20% credit, a net tax bill of £3,791, leaving just £625 a year, roughly £52 a month. Even in one of the strongest yield regions in the country, that's how thin the higher-rate margin already runs before anything goes wrong with a tenancy.

So if you're a higher-rate taxpayer holding a property like this, you're already clearing barely £52 a month after tax on a genuinely good 8.7% yield, which is precisely the kind of margin that a single prolonged tenant dispute, of the sort we've also seen squeeze a similarly-taxed Manchester buy-to-let, can wipe out several times over.

What restarting under Section 8 actually costs, in cash and in time

Court fees for landlords rose alongside the wider Renters' Rights Act reforms. The county court fee to issue a possession claim went up from £404 to £415, and the warrant of possession fee a bailiff charges to enforce it rose from £148 to £152, both from 13 July 2026 (Ministry of Justice / GOV.UK, Court and tribunal fees update, July 2026). A solicitor typically charges around £350 to serve a Section 8 notice before hourly rates apply for anything contested, and industry estimates put the average total legal bill for a landlord using a solicitor at around £3,000 once a case runs its course.

The bigger number is time. The median wait from a court claim being issued to a landlord actually getting the property back was 27.0 weeks in the final quarter of 2025, up from 25.0 weeks a year earlier (Ministry of Justice, Mortgage and Landlord Possession Statistics). If the tenant behind that lapsed Section 21 notice isn't paying rent, the mortgage interest on our Yorkshire example, £844 a month, keeps being due with nothing coming in to cover it. Over 27 weeks, roughly six months, that's about £5,233 in mortgage interest alone, on top of the £3,000 or so in court and legal costs above, for a total potential cash outlay north of £8,000 before you get the keys back.

Set that £8,000-plus against the property's own numbers and the scale of the problem is obvious. For a basic-rate landlord clearing £3,533 a year after tax, one stuck tenant costs roughly two and a half years of that property's entire profit. For a higher-rate landlord clearing just £625 a year, it's closer to thirteen years' worth, an outcome that makes the incorporation break-even maths we've run elsewhere look almost quick by comparison. You can run the equivalent numbers on your own portfolio with our Section 24 tax calculator or our BTL yield calculator before deciding how much risk a marginal property is really worth carrying.

The compliance bill landlords are already carrying, on top of this

Eviction costs aren't happening in isolation. A Handelsbanken survey of around 200 property investors found the median cost of complying with the Renters' Rights Act more broadly, covering documentation, new tenancy paperwork, safety requirements and the rest, has reached £5,000, exceeding the government's own earlier estimates (PropertyWire, 24 July 2026). Forty percent of landlords surveyed said the extra cost and complexity is pushing them to prioritise lower-risk tenants, 20% have already sold a property because of it, 19% have pulled one out of the rental market entirely, and 46% say cost pressure has forced them to delay planned upgrade or improvement work.

So the lapsed Section 21 notice isn't an isolated admin failure. It's landing on top of a compliance bill that's already reshaping how professional landlords behave, and for a portfolio running on the kind of higher-rate margin our Yorkshire example shows, that combination is exactly what's tipping a meaningful share of landlords toward selling rather than absorbing another round of cost and delay.

What this means for you

The maths points toward treating this as urgent rather than administrative. If you're not certain a Section 21 claim was actually issued at court before 31 July, check with your solicitor or letting agent today, because assuming it was and finding out otherwise in three months' time only adds to the delay. If it has lapsed, get a Section 8 notice drafted for the correct ground and served this week rather than next month, since every week you wait is a week added to a process that already runs close to nine months from first notice to repossession.

Frankly, if you're a higher-rate taxpayer running a property with a genuinely difficult tenant and a margin as thin as £52 a month, this is also the moment to weigh whether that specific property still earns its place in the portfolio once you've priced in what a repeat of this situation would cost. Most landlords in that position are better off building a larger cash reserve against exactly this scenario, or seriously pricing up a sale, than assuming the next tenant dispute will resolve itself faster or cheaper than this one did. This is a decision worth running past a solicitor who handles possession claims regularly, since the right Section 8 ground and the realistic timeline both depend on the specifics of your case.