Four Instruments and a Housing Market

Fifteen years ago, letting a flat to visitors was an unregulated activity in most cities. It is now one of the most heavily regulated things a city can control, and the rules differ so sharply between neighbouring cities that a traveller cannot reason from one to the next. What follows is the anatomy of the regulation rather than a table of numbers, because the numbers change every legislative season and a stale table is worse than none.

The four instruments

Registration. The property must hold a licence or registration number, which must appear in the listing. This is the mildest instrument and the most widespread, and its real function is not to restrict anything — it is to make the other three enforceable, by creating a register against which a platform can be compelled to check.

Night caps. An entire home may be let for no more than a defined number of nights per year — beyond that it is a business, requiring a change of use that residential planning will not grant. This is the instrument that distinguishes genuine home-sharing, where a resident lets their own home while away, from a de facto hotel operating in a residential building. Platforms in several cities are now obliged to enforce the cap automatically by blocking the calendar.

Zone restrictions. New short-let licences are refused entirely in defined districts, usually the historic centre, and existing ones are not transferable with the property. Some cities have gone further and required existing entire-home lets in the centre to convert back to residential use within a stated period.

Structural bans. A prohibition on letting a property that is not the host’s principal residence — the strongest instrument, and the one that most directly attacks the investor-owned flat rather than the practice of letting.

Every one of these rules is about housing. The visitor is regulated as a side effect of a market the visitor did not create but does sustain.

Why enforcement is the whole story

A registration requirement without a mechanism to check it is a suggestion, and for the first several years of this regulatory wave that is largely what it was — cities passed rules, platforms declined to share data on privacy grounds, and enforcement meant an inspector knocking on doors. The change came from data-sharing obligations: where a platform must supply listing-level information or must verify a registration number before publishing, compliance moves from a minority to near-universal in a matter of months.

That is why two cities with identical written rules can have completely different markets. The rule is not the policy; the reporting obligation is.

What it means at the booking stage

An unlicensed listing in a city with a registration regime is a risk borne by the guest, not the host. Enforcement action against a property can cancel a booking days before arrival, and the platform’s remedy is a refund rather than a replacement bed in a full city at short notice. A listing showing a registration number in a city that requires one is doing the single most useful thing it can to reassure you, and a listing that is evasive about the address is doing the opposite.

Building-level rules are the other exposure. A property may be perfectly licensed by the city and prohibited by the building’s own rules or by the owners’ association, which is how guests end up in disputes with a concierge, a neighbour or a lift that will not accept a visitor’s fob. In several countries the association’s power to prohibit short lets in the building has been strengthened specifically for this reason.

The honest position

The evidence that concentrated short-letting raises residential rents in central districts is now substantial — consistent in direction, still contested in size — and the effect estimates vary by study and city. That is why the regulation keeps arriving, and it is why the industry’s argument has shifted from denying the effect to disputing its magnitude.

It is also true that in less-visited neighbourhoods and in rural areas, letting rooms is a straightforward transfer of tourist money to residents with no housing effect worth measuring, and that the strongest instruments applied indiscriminately hurt exactly the places that most need the income. A national ban is a bad answer to a problem that exists in eleven postcodes.

A traveller does not resolve that argument. What a traveller can do is check the local rule before booking, prefer a licensed property, and register that the difference between staying in a resident’s spare room and staying in a block that has no residents left is not a moral abstraction — it is visible from the stairwell on the first morning, in the row of keyboxes and the absence of anybody’s post.