The room is the easy part. Whether your landlord, your community of owners and your insurer accept a third adult living in the flat is what decides the whole plan, and almost nobody asks before advertising for one.
An au pair is a cultural exchange, not a job. The family provides a private room, full board and pocket money; the young person provides 25 to 30 hours a week of childcare and light help around the house and takes language classes. In Spain the going rate is 70 to 80 euros a week, so 280 to 320 euros a month, and everyone I have met in the Maresme pays at the upper end because the competition for a good au pair is real.
There is no Spanish au pair statute. The framework is the 1969 European Agreement on Au Pair Placement, which Spain ratified, plus the immigration route for non-EU candidates, which runs through a long-stay student visa. The current student regulation caps household tasks at five hours a day with at least one full free day a week. That is a rule that moves, so confirm the details with an immigration lawyer before you promise dates to anyone.
The standard the agencies use is 8 to 9 square metres, a real bed, a wardrobe, a desk and chair, a window with daylight, heating, and a door that locks from the inside. It has to be inside the family home, not a converted garage at the end of the garden, and not shared with a child.
In a Barcelona flat the third bedroom is often six or seven square metres, and in a pre-1980 building it may be interior, with a window onto a light well that gives you a grey rectangle at noon. It technically counts as a bedroom for the cèdula d'habitabilitat and it fails every au pair standard ever written. If the room is the reason you are doing this, look at the plan before you look at the photos.
This is where plans fall apart. If you rent, you cannot simply move another adult into the flat. Article 8 of the LAU requires the owner's written consent for subletting or ceding part of the home. An au pair who pays nothing is not a sublet in the strict sense, but a lease that names the occupants and forbids additional residents is enforceable, and a landlord who finds a stranger on the padron has grounds to complain.
Ask in writing, in one message, and describe it accurately: a young woman or man on a student visa, living in the third bedroom, no rent paid, no subletting, twelve months maximum. Keep the reply. In my experience owners in Alella, Cabrils and Llavaneres say yes more often than Barcelona agencies, because the house is bigger and the fear is not the same.
The community of owners is the second gate. Statutes in many Barcelona buildings limit the number of occupants per flat or ban renting rooms; those rules bind the owner, and through the owner, you. The community cannot evict anyone, but it can require the owner to stop the situation, and the owner will pass that pressure down to you.
A home policy covers the family that took it out. A resident who is not family may sit outside the contents cover and, worse, outside the civil liability if she leaves a pan on the hob. Tell the insurer that a third adult lives there. In most cases the premium moves by a few euros; in some, the company wants the person named as an insured party.
The padrón is the next queue. The au pair needs it for the TIE, for the language school and often for a bank account, and the town hall will ask for the lease and the owner's authorisation. In a rented flat that means asking the owner to sign a second paper, which is another reason to have the conversation at the start rather than in week three.
The moment the arrangement stops being an exchange, it becomes employment. More hours than the exchange allows, a monthly salary instead of pocket money, no language course, and a labour inspection will call it empleada de hogar. That means a written contract, registration with the Social Security before the first day of work, and a minimum full-time cost around 1,221 euros a month in 2026, paid by the employer.
Do the honest comparison. Pocket money at 320 plus a room that would rent for 500 to 750 in a Barcelona shared flat plus food at 150 to 200 puts the real cost at roughly 970 to 1,270 euros a month. A cleaner coming twenty hours a week costs about 950 to 1,250 plus Social Security. The au pair is not the cheap option. It is the flexible one, and the only one that covers seven in the morning and nine at night.
Four and five bedroom villas in Alella, Cabrils, Teià and Llavaneres, with the extra room and the paperwork question already answered. Ask us before you sign.
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