Whether it is legal, what consent you need, what a proper agreement looks like, and how people lose money doing it badly.
Yes, when it is done with consent and the right paperwork. It becomes unlawful in practice when the landlord's lender or freeholder has not permitted sub-letting, when the property needs a licence that nobody has obtained, or when the arrangement is dressed up as something it is not. Rent-to-rent is not a legal grey area in itself, the trouble comes from operators who skip consent because getting it is slow.
In a rent-to-rent arrangement the person in control or managing the property is generally the one who must hold the licence, and that is usually you, not the owner. Councils have prosecuted rent-to-rent operators directly. Operating an unlicensed licensable HMO risks an unlimited fine or a civil penalty of up to £30,000 per offence, a rent repayment order giving tenants back up to twelve months' rent, and a banning order. Never assume the owner's licence covers you, check it names the right person and the right occupancy.
Four things in writing: the landlord's own consent to sub-let for your specific use; their mortgage lender's permission, because most buy-to-let terms prohibit sub-letting; the freeholder's permission if the property is leasehold, since most residential leases bar sub-letting and short lets outright; and confirmation their insurer knows. Our free rent-to-rent checklist walks through all four, and if a landlord will not evidence them, walk away, that is the deal that ends in a Section 8 notice and a lost float.
Not an AST, an assured shorthold tenancy gives you a tenant's rights and obligations, not a business arrangement, and it usually prohibits sub-letting anyway. The two standard structures are a commercial lease to your company, or a management agreement where the landlord remains the direct landlord and you manage for a guaranteed sum. Which one is right changes your liabilities, your tax and who holds the licence, so this is a genuine 'pay a property solicitor' moment rather than a download-a-template one.
For a single-let-to-HMO conversion, £400–£900 a month net per property is a realistic band once you subtract rent, bills, voids, cleaning, maintenance, licensing and management. For rent-to-SA the gross is higher and so is the volatility. Anyone quoting £1,500+ per unit as normal is either in an exceptional location, running six-bed HMOs, or quoting gross.
You are contractually liable for the rent whether or not the property is occupied, that is the entire product you have sold the landlord. This is why the model needs a float of at least three months' rent per unit before you take a second property. Operators who scale to five units on one month's buffer are the ones who fail, because two simultaneous voids ends them.
Some do, most are cautious, and the ones who say no are usually protecting a landlord relationship rather than objecting in principle. What changes the conversation is turning up as a business: company details, insurance, references from existing landlords, a written schedule of what you maintain, and honesty about the model rather than calling it a 'corporate let' and hoping they do not ask.
It is the same mechanism described from the landlord's side. You guarantee the owner a fixed monthly sum regardless of occupancy, and you keep the difference between that and what the property actually earns. The phrase matters commercially because 'guaranteed rent' sells the benefit the landlord wants, while 'rent-to-rent' describes what you are doing. Use plain language with landlords either way, misdescription is exactly what gets operators into trouble.
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The questions almost everybody asks in their first month, how much money you need, whether it is too late, and what to do first.
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