Over the past few years, I’ve watched the short-term let market in the UK shift from a largely unregulated side hustle into something that now demands serious planning. The number of property owners who have built a solid income stream through platforms like Airbnb and Vrbo is significant, but the rules have changed faster than many realise. By 2026, anyone letting a property for less than 90 consecutive nights in England must register with a new mandatory scheme, and the old tax advantages that made short-term letting so attractive have been stripped away. If you’re a UK property investor, this isn’t a distant rumour — it’s a regulatory shift that affects your bottom line right now.
What I’ve noticed across the coverage of these changes is that most investors focus on the wrong thing — they worry about platform fees or guest reviews, when the real risk is operating without the correct planning permission or registration. A common property investment myth is that short-term letting is essentially the same as long-term renting with better yields. That was never quite true, and now it’s dangerously wrong. Here’s what you actually need to know.
What the New Short-Term Let Rules Actually Mean for Your Property
The most important thing to understand is that the old free-for-all is over. Before 2024, you could list a spare flat on Airbnb with almost no regulatory friction. Now, the way you structure your property investments has to account for a completely different set of rules. The core change is the introduction of a mandatory short-term let registration scheme under the Levelling Up and Regeneration Act 2023. By 2026, every host in England must register each property separately, confirm basic safety compliance, and display the registration number on every listing. Platforms are required to remove listings without a valid number after a transition period. Operating without registration carries a civil penalty of up to £2,500 per property.
Alongside registration, the planning use class system has been overhauled. If you let a property for more than 90 days a year, it now sits in Class C5, not C3. That means you need planning permission to change its use. Local authorities can also adopt Article 4 Directions to remove the permitted development right to switch between C3 and C5 without permission. Several councils in areas with acute housing pressure have already done this. If I were looking at a property today, my first move would be to check whether an Article 4 Direction applies in that postcode — it could make the difference between a viable investment and a costly mistake.
Why the 90-Day Rule in London Still Matters — and Where It Doesn’t
The 90-day rule in London has been around since the Deregulation Act 2015, but it’s still widely misunderstood. It applies only to whole-home lets in the 32 London boroughs and the City of London. You can let your entire home for up to 90 nights per calendar year without planning permission. Exceed that, and you’re technically operating without permission, facing a fine of up to £20,000 from your borough council. The rule does not apply to rooms within an occupied home — those are covered differently under permitted development. And it does not apply outside Greater London at all. In other English cities, short-term let regulations are set at local authority level through planning policy and the new registration scheme.
What I find interesting is how many hosts in London assume the 90-day cap is a soft limit. It isn’t. Platforms like Airbnb automatically stop listings after 90 nights for hosts who haven’t verified they have planning permission for unlimited short-term letting. If you’re a London investor relying on year-round Airbnb income, you need to either accept the 90-night cap or apply for planning permission to operate outside it. That’s a significant constraint that many don’t factor into their financial projections. A property flipping strategy that depends on short-term let income in London now has a hard ceiling unless you secure the right permissions.
Where Property Investors Get the Tax and Registration Rules Wrong
The most expensive mistake I see is assuming the old Furnished Holiday Let (FHL) tax regime still applies. It was abolished from 6 April 2025. Short-term let income is now taxed as standard property income under ITTOIA 2005. That means mortgage interest relief is restricted to basic rate, and capital gains tax reliefs like Business Asset Disposal Relief and roll-over relief no longer apply. If you bought a property expecting to sell it with reduced CGT through FHL status, that planning window has closed.
→ Scroll right to see all columns
| Tax Feature | Before April 2025 (FHL) | From April 2025 |
|---|---|---|
| Mortgage interest relief | Full relief against income | Restricted to basic rate |
| Capital allowances | Available on furniture and equipment | Not available |
| Capital gains tax reliefs | Business Asset Disposal Relief, roll-over relief | Not available |
| Pension contributions | Eligible as relevant earnings | Not eligible |
Ignoring the 140/70 Day Rule for Council Tax
Another common oversight is the council tax versus business rates threshold. If your property is available for short-term letting for 140 or more days per year and actually let for 70 or more days, it moves from council tax to business rates. That sounds like a problem, but it can actually work in your favour. Properties with a rateable value under £12,000 qualify for 100% Small Business Rate Relief if you have no other business properties — effectively zero rates. Below the 70-day letting threshold, the property remains liable for council tax, and the second home premium (up to 100% additional council tax) applies in many areas. If I were advising someone on this, I’d say track your letting days carefully — the difference between 69 and 70 let days could save you thousands.
Forgetting About Mortgage and Lease Restrictions
Many standard mortgage policies and building insurance policies exclude short-term letting entirely. If you let your property on Airbnb without checking your mortgage terms, you could be in breach of your loan conditions. The same applies to leaseholders — many leases prohibit short-term letting outright. A quick check with your lender and a review of your lease can save you from a costly enforcement action. A tenant-landlord lawyer can help you review your lease terms if you’re unsure.
Underestimating Safety Compliance Requirements
Registration under the new scheme requires you to confirm compliance with basic safety standards: gas safety certificates (CP12) from a Gas Safe registered engineer, electrical installation condition reports, and smoke and carbon monoxide alarms meeting the Smoke and Carbon Monoxide Alarm (England) Regulations 2022. A carbon monoxide alarm is a simple, low-cost device that meets the requirement. Failing to have these in place before registration can delay your application and leave you operating without a valid registration number.
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How to Get Your Short-Term Let Compliant in 2026
The steps to compliance are straightforward, but they require action before you list or continue listing a property. Here’s what I’d do in order.
Check Your Planning Position First
Before anything else, confirm whether your property needs planning permission to operate as a short-term let. If it’s your primary residence and you let it while you’re away, it remains in Class C3 and no permission is needed. If it’s a second home or investment property, and you let it for more than 90 days a year, it falls into Class C5 and you need planning permission. Check whether an Article 4 Direction applies in your area — your local council’s planning portal will have this information. If you’re unsure, a real estate lawyer can review your position quickly.
Register Under the Mandatory Scheme
Once your planning position is clear, register each property separately with your local authority. You’ll need to provide the property’s address, the type of accommodation, your identity, and evidence of safety compliance. After registration, you’ll receive a registration number that must appear on every platform listing. Platforms are required to remove listings without a valid number after the transition period. Operating without registration carries a fine of up to £2,500 per property.
Get Your Safety Certificates in Order
You need a current gas safety certificate (CP12) from a Gas Safe registered engineer, an electrical installation condition report (EICR), and working smoke and carbon monoxide alarms. A smoke alarm with a 10-year battery is a reliable option. These documents are required for registration and expected by most platforms. Keep them filed digitally and physically — you may need to produce them on inspection.
Review Your Tax Position
With the FHL regime gone, your short-term let income is now standard property income. File a Self Assessment return if your income exceeds the £1,000 property income allowance. You can claim allowable expenses: letting agent fees, cleaning, maintenance, insurance, utilities, broadband, platform fees, and a proportion of mortgage interest (basic rate relief only). If your property crosses the 140/70 day threshold, you’ll need to register for business rates and can claim Small Business Rate Relief if eligible.
- 1Confirm Planning PositionCheck if your property needs planning permission for Class C5 use. Review local Article 4 Directions on your council’s planning portal.
- 2Register Each PropertySubmit address, accommodation type, owner identity, and safety compliance evidence to your local authority. Obtain registration number.
- 3Obtain Safety CertificatesArrange gas safety check (CP12), electrical condition report (EICR), and install smoke/CO alarms. Keep certificates on file.
- 4Review Tax and Rates PositionFile Self Assessment if income exceeds £1,000 allowance. Track letting days to determine council tax vs business rates liability.
What’s Coming Next — The Future of Short-Term Let Regulation
The registration scheme is still in its early stages, and I expect local authorities to become more active in enforcement as the register matures. Several councils have already adopted Article 4 Directions, and more are likely to follow. The government has also indicated that it may extend the registration scheme to cover safety inspections more comprehensively. If you’re planning to enter the short-term let market, do it with full compliance from day one — the cost of catching up later will be higher.
Do I need planning permission to let my own home on Airbnb while I’m on holiday? ▾
What happens if I don’t register my short-term let by 2026? ▾
Can I still claim the Rent a Room scheme for short-term lets? ▾
Does the 90-day rule apply outside London? ▾
What’s the difference between Class C3 and Class C5? ▾
The short-term let market in the UK has changed fundamentally, and the window for operating without full compliance has closed. My advice is straightforward: check your planning position, register each property, get your safety certificates in order, and review your tax position with the FHL regime gone. The cost of getting it wrong — fines, enforcement action, and lost income — far outweighs the effort of getting it right. If this was useful, you might also want to read Downsizing Dilemmas: Navigating Retirement Property in the UK.
Sources and Further Reading
The Great Escape: Are More Brits Leaving Cities for Rural Homes? — Explores the migration patterns that are reshaping property demand across the UK.
Airbnb Short Let Planning Rules UK 2026. Property Passport, 2025.
Short-Term Let UK 2026. LetSafe UK, 2025.
