Bathroom ventilation rules in Tallinn flats: what you may and may not change

Why bathroom air runs through a shared shaft in the building

In a typical Tallinn apartment building, bathrooms and kitchens vent into a single vertical shaft that serves every flat stacked above and below yours. Air moves by natural draught, pulled upward by the temperature difference between the stairwell and the outside, or pushed by a shared mechanical system in newer buildings with underfloor heating and balanced ventilation.

Because the shaft is continuous, what happens in your bathroom affects the flat above and below. A blocked riser starves every connection point of draught, not just yours. A fan installed the wrong way can push your bathroom's moist air into a neighbour's flat instead of outside. This is why the shaft itself is treated as part of the building, not part of any one flat.

What you may decide on your own as the flat owner

Inside your own bathroom, you generally decide the extractor grille, the tiling, the fan model at the point where it connects to the shaft, and the layout of sanitary fittings, as long as the connection to the shared duct stays where it was. Swapping a tired grille for a new one, or fitting a fan with a humidity sensor at the existing outlet, is normal renovation work.

You also decide the finish and the fittings: whether to run a wet-room floor, tile up to the ceiling, or add a heated towel rail on the district heating loop where the building allows it. None of this touches the shaft or the building's shared systems, so it does not usually need anyone's sign-off beyond your own good judgement.

What you must not do: capping, blocking or rerouting the shaft

The one thing an owner cannot do alone is alter the shaft itself. That means no capping it off because a bathroom smells of a neighbour's cooking, no stuffing insulation into the riser to quiet a draught, and no rerouting the duct sideways through a false ceiling to suit a new layout.

Each of these breaks the draught balance for other flats and can send moist or smoky air where it should not go. A shaft that has been narrowed or redirected is also very hard to trace later, which becomes someone else's problem when a mould issue turns up two floors away with no obvious cause.

• Do not cap or seal a shaft opening, even temporarily
• Do not insulate or pack material inside the riser
• Do not reroute ducting to a different wall or shaft
• Do not connect an extractor fan to a shaft it was not designed for
• Do not remove a shared fan or damper without agreement

What the apartment association controls and when to ask the manager

The apartment association (korteriühistu) is usually responsible for the shared ventilation system as a whole: the risers, any collective fans on the roof, and the building's overall ventilation strategy. If your renovation touches anything beyond your own flat's connection point, that is the association's territory.

Ask the building manager before work starts whenever you plan to change how your bathroom connects to the shaft, add a mechanical fan where there was only a passive grille, or do anything that could alter airflow for other flats. It is a short conversation, and it avoids a much longer one later if a neighbour's bathroom starts smelling of yours.

If the bathroom already has a damp or mould problem

A shaft that has been quietly blocked for years, a fan that never worked, or tiling that traps moisture behind it are common causes of damp in older Tallinn bathrooms. Before assuming the whole ventilation system is at fault, it is worth checking whether the existing grille is even open and whether the fan, if there is one, still runs.

If the draught genuinely is poor and the cause sits inside your own flat, an hour of diagnostic work often settles the question. Our odd jobs service, from 39 € an hour, covers this kind of check: opening the grille, testing draught with a lit match or tissue, and confirming whether the fan or the shared shaft is to blame.

If the bathroom is going into a full renovation

A full bathroom renovation is the natural point to get the ventilation right rather than working around what was there before. That can mean a new extractor fan with a humidity sensor, a better-sealed connection to the shaft, or simply confirming with the association that the planned layout does not require moving the duct connection.

Our bathroom renovation service, from 3 500 € per job, includes this kind of planning as standard: we check what the shaft allows before tiling begins, so the ventilation is sound rather than an afterthought once the room is finished.