Over 451,000 properties across Great Britain are now listed on Airbnb — a 13% increase since 2019. That number tells you something important: short-term letting has moved from a side hustle for a few people into a mainstream part of the UK housing market. I’ve been watching this space for years, and what I keep seeing is hosts who jump in without realising how much the ground has shifted beneath them. The rules that applied when you first heard about Airbnb are not the rules that apply now.
The problem is that the legal landscape has changed fast — and it’s still changing. A mandatory registration scheme is coming for England in 2026. Planning permission rules have already tightened. The tax treatment of short-term let income was overhauled in April 2025. And if you’re in London, the 90-day cap has teeth. Get any of this wrong, and you’re looking at fines, enforcement action, or worse. Here’s what you actually need to know.
If you’re thinking about listing a property, the first thing to sort out is whether you’re even allowed to. Most residential mortgages prohibit short-term letting without lender consent. A standard buy-to-let mortgage typically only allows tenancies of six months or more. Letting on Airbnb without permission is a breach of your mortgage terms, and the lender can call in the loan. A dedicated short-term let mortgage exists, but you need to arrange it before you list, not after. A real estate lawyer can review your mortgage terms and leasehold agreement to confirm what permissions you need before you start.
What the short-term let registration scheme actually means for you
The most important thing to understand about the new rules is that they turn short-term letting from an unregulated activity into a regulated one. Under the Levelling-up and Regeneration Act 2023, the government created the legal framework for a mandatory registration scheme that comes into force in 2026. This is not optional. Every host in England must register their property with the national register before they can list it on any platform. Airbnb, VRBO, and Booking.com will be required to check your registration number before they publish your listing.
What I’d do if I were starting today: register the property as soon as the portal opens on gov.uk. Don’t wait until you have a booking. The penalty for listing an unregistered property is a fixed penalty notice of £2,500, and that rises to £7,500 for repeated breaches. Local authorities will have access to the register to cross-check against planning and licensing compliance, so there’s no hiding from it.
Why the planning permission change catches most hosts out
Before May 2024, you could let a second home on Airbnb without thinking about planning permission at all. That changed with the creation of Class C5. If the property you want to let is not your primary residence — meaning it’s a second home or an investment property — you now need planning permission to use it as a short-term let. Your primary residence is exempt: if you go on holiday and let your own home while you’re away, it stays in Class C3 and no permission is needed.
This distinction matters more than most hosts realise. Local authorities can designate areas where permitted development rights do not apply, meaning you cannot switch between residential and short-term let use without a full planning application. Tourist hotspots are the most likely areas to see these restrictions. Operating without the required planning permission puts you at risk of a planning enforcement notice, a stop notice, or even prosecution.
Consider this scenario: you buy a flat in Cornwall as a holiday let. You assume you can list it on Airbnb straight away. But if the local council has removed permitted development rights in that area, you need planning permission first. If you list without it, the council can issue a stop notice that prevents you from taking any further bookings. The income stops, but your mortgage and council tax bills don’t.
What I’d do: check your local authority’s website before you buy or list. Look for any Article 4 directions that remove permitted development rights for short-term lets in your area. If you’re in London, assume the 90-day cap applies unless you have explicit planning permission for unlimited short-term letting. A property lawyer can check the planning status of your property and advise on whether you need to apply for a change of use.
Where hosts get tripped up — and how to avoid it
I’ve seen the same patterns repeat. Hosts focus on the listing photos and the welcome hamper, and they forget about the legal and financial infrastructure that keeps the whole thing running. Here are the mistakes that cause the most trouble.
Letting without mortgage or landlord permission
This is the most common and the most dangerous. Most residential mortgage lenders prohibit any commercial letting, including Airbnb, without their express consent. Buy-to-let mortgages typically allow long-term assured shorthold tenancies but prohibit short-term lets of less than six months. If you let on Airbnb without permission, you are in breach of your mortgage terms. The lender can demand full repayment of the loan. If you’re a tenant, your lease almost certainly prohibits subletting or running a business from the property. Verbal permission from your landlord is not enough — you need written consent.
Ignoring the 70/140 day tax threshold
The tax treatment of your property changes depending on how much you let it. 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. Properties with a rateable value under £12,000 can qualify for 100% Small Business Rate Relief, effectively paying zero rates. But if you fall below the 70-day letting threshold, you remain liable for council tax — and in many areas, the second home premium adds up to 100% additional council tax. You need to track your availability and actual letting days carefully, because the threshold determines which tax regime applies.
Assuming the old FHL tax rules still apply
The Furnished Holiday Letting tax regime was abolished from April 2025. Short-term let income is now taxed as ordinary property income. The practical losses are significant: mortgage interest relief is restricted to basic rate only, capital gains tax reliefs like Business Asset Disposal Relief and roll-over relief no longer apply, and you cannot use FHL profits to qualify for pension contributions. If you were relying on these reliefs in your financial planning, you need to revisit your numbers.
Skipping the safety checks
The mandatory registration scheme requires basic safety compliance: smoke alarms on every storey, carbon monoxide alarms in rooms with solid fuel combustion appliances, and a valid gas safety certificate from a Gas Safe registered engineer. An electrical installation condition report (EICR) is also expected. If you’re letting to six or more guests, a formal fire risk assessment is recommended. A smoke alarm with a 10-year battery is a simple, low-cost way to meet the requirement on one storey, but you need one on every level.
→ Scroll right to see all columns
| Requirement | What you need | Penalty for non-compliance |
|---|---|---|
| Registration | Register property on national register before listing | £2,500 fixed penalty (rising to £7,500) |
| Planning permission | Class C5 change of use for non-primary residences | Enforcement notice, stop notice, prosecution |
| London 90-day cap | Limit whole-property lets to 90 nights per year | £20,000 fine from local borough |
| Gas safety | Annual CP12 certificate from Gas Safe engineer | Platform delisting, prosecution |
| Smoke alarms | Working alarm on every storey | Registration refusal, liability risk |
What I’d do: before you list, run through the safety checklist as if you were a letting agent doing an inspection. Fit the alarms, book the gas safety check, and get the EICR done. Keep the certificates in a folder you can access from your phone. Platforms are increasingly asking for proof of compliance, and the registration scheme will require it.
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How to set up your short-term let the right way
Getting the legal and financial foundations right before you list saves you from scrambling later. Here is the sequence I would follow.
Check your mortgage and lease before anything else
Read your mortgage terms. If they say “no commercial letting” or “no subletting,” you need to contact your lender and ask for permission to let on a short-term basis. Some lenders will agree, others will require you to switch to a dedicated short-term let mortgage product. If you are a leaseholder, read your lease. Many leases prohibit running a business from the property, and short-term letting counts as a business. You need written consent from the freeholder. A tenant landlord lawyer can review your lease and advise on whether your letting plans are permitted.
Register with the national short-term let register
Once the registration portal opens on gov.uk, register your property before you create any listings. The registration requires you to confirm your safety compliance, so have your gas safety certificate, EICR, and alarm installation records ready. Platforms will ask for your registration number before they publish your listing. If you list without one, you face the £2,500 penalty.
Set up your tax reporting correctly from day one
Short-term let income is now taxed as property income. You need to register for Self Assessment with HMRC if your income exceeds the £1,000 property income allowance. Keep records of all income and allowable expenses: cleaning, maintenance, insurance, utilities, broadband, platform fees, and a proportion of mortgage interest (basic rate relief only). Track your availability and actual letting days to determine whether you fall under council tax or business rates. If you cross the 70-day letting threshold, notify your local council so they can reassess your property for business rates.
Install the required safety equipment and get the certificates
Fit a smoke alarm on every storey. Fit a carbon monoxide alarm in every room with a solid fuel combustion appliance — wood burner, open fire, gas boiler. Book an annual gas safety check with a Gas Safe registered engineer. Arrange an electrical installation condition report. If you are letting to six or more guests, complete a formal fire risk assessment. A carbon monoxide alarm with an electrochemical sensor is the type recommended for rooms with gas appliances, as it is more accurate than cheaper alternatives.
Understand the London 90-day cap if it applies to you
If your property is in Greater London and you are letting the whole property, you are limited to 90 nights per calendar year without planning permission. Airbnb enforces this automatically for hosts who have not verified they have planning permission for unlimited letting. If you exceed the cap, your borough can fine you £20,000. Room-by-room lettings where you remain resident are not capped, so if you live in the property and let individual rooms, the 90-day rule does not apply to you.
- 1Check mortgage and lease termsRead your mortgage agreement and lease for any clauses prohibiting commercial letting or subletting. Contact your lender and freeholder for written consent before listing.
- 2Register with the national registerOnce the portal opens on gov.uk, register your property before creating any listings. Have your safety certificates ready to upload.
- 3Set up tax reportingRegister for Self Assessment if income exceeds £1,000. Track income, expenses, and letting days. Notify your council if you cross the 70-day threshold.
- 4Install safety equipment and get certificatesFit smoke alarms on every storey, CO alarms in relevant rooms. Book gas safety check and EICR. Complete fire risk assessment for 6+ guests.
- 5Check local planning rules and London capCheck your local authority’s website for Article 4 directions. If in London, confirm whether the 90-day cap applies to your letting arrangement.
Frequently asked questions
Can I let my own home on Airbnb while I’m on holiday without planning permission? ▾
What happens if I list my property without registering for the new scheme? ▾
Does the 90-day rule in London apply if I let a single room in my flat? ▾
Can I still claim mortgage interest relief on my Airbnb income? ▾
Do I need a specific mortgage for short-term letting? ▾
The rules around short-term letting in the UK have changed more in the last two years than in the previous decade. The mandatory registration scheme, the new planning use class, the abolition of the FHL tax regime, and the continued enforcement of the London 90-day cap all add up to the same message: this is no longer an unregulated space. If this was useful, you might also want to read Is location still king in the UK property market?
Sources and Further Reading
The impact of remote work on UK property preferences — Explores how changing work patterns are reshaping demand for short-term let locations across the UK.
Short-term let UK 2026: new rules and registration. Letsafe UK, 2025.
Legal requirements for Airbnb UK 2026. BnB Management London, 2025.
