Guide
Mould in a rented flat in Barcelona: who pays, landlord or tenant?
The starting point in Spanish law is that your landlord pays for repairs that keep the flat habitable. The fight is almost always about cause — and this page is a structure for working out which case you are in.
Where it usually appears
What you can check yourself
When to contact us
You can write in English — we reply in English. We usually reply quickly. If we are on a job, it may take up to 2–3 hours.
The short answer, before the detail
The starting point in Spanish law is that your landlord pays. Article 21.1 of the Ley de Arrendamientos Urbanos (LAU) obliges the landlord to carry out all repairs necessary to keep the home habitable, at their own cost, and without raising the rent for it. That duty is imperative: Article 6 LAU treats as void any clause in your contract that shifts it onto you.
The exception is where the whole argument happens. The same article carves out deterioration attributable to the tenant, and Article 21.4 puts small repairs arising from ordinary wear and tear on you — with no euro threshold anywhere in the statute, whatever figures you find online. So the useful question is never “who pays for mould” but what caused this particular damp. Water through a façade, roof, riser, terrace or a neighbour’s flat points at the landlord or the building’s comunidad de propietarios. Damp your landlord can show comes from how the flat is heated, ventilated and used points back at you.
This page is general information about Spanish and Catalan law. It is not legal, financial or insurance advice, and NoMoho provides none of those — we treat surfaces, and we are not lawyers, loss adjusters or insurance intermediaries. Damp cases are highly fact-dependent. If yours is live, get advice on your own facts; the Oficines de l’Habitatge de Barcelona offer free legal advice to residents.
Two things you will read in English that are wrong
“Your landlord has 20 days to fix it.” He does not. Article 21.2 LAU says that if the works themselves last more than twenty days, the rent must be reduced in proportion to the part of the home you are deprived of. The trigger is the duration of the works, not the landlord’s delay, and the clock starts when work begins — not when you reported the damp. The LAU sets no deadline for a landlord to act at all.
“Article 10 of the Ley de Propiedad Horizontal says the community must…” Not in Catalonia. Communities of owners here are governed by the Codi civil de Catalunya, Llibre V (Llei 5/2006); the national LPH does not apply to buildings in Catalonia, so a Barcelona page citing LPH articles is citing the wrong statute. Its case law remains persuasive; the operative articles are Catalan.
Which case are you in?
| Where the damp comes from | Who normally carries it | How settled is this |
|---|---|---|
| Façade, roof, party wall, riser or other shared installation | The comunidad (arts. 553-41 and 553-44.1 CCCat); your landlord must pursue it | Settled in principle |
| Capillarity rising from the ground | A building defect — landlord or community, not the tenant | Settled in principle |
| A burst or leaking pipe | Depends whether that pipe is a common element or belongs to the flat | Settled, fact-specific |
| A terrace or roof one flat has exclusive use of | Routine upkeep is that owner’s; construction or structural defects revert to the community, unless caused by misuse (art. 553-43.4 CCCat) | Settled rule, contested facts |
| Condensation | Genuinely contested (below) | Unsettled |
Article 553-44.1 CCCat is the most useful sentence in Catalan law here: the community must conserve the common elements so the building meets structural, habitability, accessibility, watertightness (estanquidad) and safety conditions. Water entering through a common element breaches that duty directly.
Condensation: the one with no clean answer
If your case is condensation, the law is not yet on anyone’s side. Spanish decisions run three ways. Some hold the tenant responsible, treating condensation as the product of insufficient ventilation. Others hold the landlord responsible where it traces to the building — insulation, thermal bridging, ventilation that was never designed in — regardless of what the tenant does. And courts do split it: one appellate case apportioned damage 50/50 between a defective roof and the tenant’s inadequate ventilation.
The workable test is whether the flat could be kept free of condensation with normal, reasonable use — a question for expert evidence about your flat, not a rule you can look up. Anyone telling you condensation is always the tenant’s problem, or always the landlord’s, is overstating the law. If this is your situation, how condensation mould behaves in Barcelona flats is a more useful starting point.
What actually settles a damp dispute: evidence
Cause is a technical question, and in practice a technical report decides it. Before the argument hardens, do four things.
- Notify in writing, early. Article 21.3 LAU obliges you to tell the landlord “as soon as possible”. No fixed number of days — but delay can shift responsibility for the worsening onto you.
- Give access. The same article entitles the landlord, or technicians they appoint, to inspect. Refusing weakens your position badly.
- Build a dated record. Photographs with dates, when it appeared, how it spread, whether it tracks rain or cold weather, and every message either way.
- Get an independent technical view if the other side’s expert reaches a conclusion you think is wrong. An insurer’s perito works for the insurer; that finding is not a judicial one.
For the mechanics — including what a burofax proves and the two options you must select for it to be worth sending — see reporting damp to your landlord in Spain. If the words in a quote or an email are the obstacle, the English–Spanish damp vocabulary is there to be opened mid-conversation.
What you can realistically make happen
The remedies are narrower than internet advice suggests, and mostly not self-executing.
- Proportional rent reduction while conservation works run beyond twenty days, tied to the part of the home you cannot use.
- Urgent works at the landlord’s cost, but only to avoid imminent damage or serious discomfort, and only after notifying them. Doing the work silently and presenting an invoice is much weaker.
- Termination under Article 27.3.a) for failure to carry out Article 21 repairs. No timescale attaches; courts assess reasonableness. This normally goes through a court — walking out or stopping payment on your own initiative invites a claim against you.
- The municipal route, under-used. Under Article 197.3 of the Catalan urbanism law the Ajuntament must order the necessary works when an interested party asks, and can execute them at the owner’s cost or impose recurring fines. It can address that order to the community — which matters, because Catalan law gives no quick judicial shortcut against a community that refuses to repair.
One Catalan detail: a valid cèdula d’habitabilitat is legally required to let a home here. It does not lapse because damp appears — but letting a property that could not obtain one carries real exposure.
Insurance rarely resolves it, and there may be three policies
In a rented flat there can be a landlord’s building policy, your contents policy, and the community’s — and the community’s is often the relevant one when the source is a common element. Only the specific wording governs, but the market pattern turns on one distinction: sudden and accidental water escape is typically covered, while gradual damp, condensation and rising damp are typically excluded, as is filtration blamed on worn waterproofing. “Home insurance covers damp” and “home insurance never covers damp” are both wrong. Check with a broker rather than a website — ours included. More in damp, your comunidad and your seguro de hogar.
Where we fit, and where we do not
NoMoho treats the visible side: cleaning and treating mould, preparing damaged damp surfaces, and anti-mould paint as a finish on a prepared wall. We do not do waterproofing or building works, leak repair, injection against rising damp or ventilation installation, and we do not write expert reports or act in landlord disputes. From photos we can usually say whether this is surface work or something whose cause sits elsewhere — which usually tells you whether you need an arquitecto técnico to establish the cause first. That is an informal opinion, not an expert report, and it carries no weight in a dispute. We do not promise mould will not return: how the room is used and ventilated matters too.
Mould removal in Barcelona explains the surface work. Or send a wide shot, a close-up and a line of context on WhatsApp — in English — and someone will read it and reply.