Renovation in Sant Boi de Llobregat
Two different cities share one name here: an old centre of houses between party walls, and post-war blocks on the hill. They are not the same job and they should never carry the same price.
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Short answer
What a renovation costs in Sant Boi
A full renovation runs from €780 to €1,600 per m², so a 70 m² flat lands between €54,600 and €112,000 in 10–14 weeks on site. An old-town house is different: with roof work and rising damp it is 4 to 6 months, and it is priced only after inspection openings, never before. The quote is fixed in writing 48 hours after the technical visit.
A flat in Marianao is a predictable job. A house in the old centre has unknowns behind the plaster, and anyone who prices one sight unseen is either guessing or planning to revise the figure later.
| Type | What decides the price | Indicative cost | On site |
|---|---|---|---|
| Flat, 1960s–70s block | Services and external joinery | €46,800–€128,000 | 10–14 weeks |
| Old-town house | Roof, damp, joist bearings | After inspection openings | 4–6 months |
| Bathroom only | Waterproofing and stack distance | from €3,200 | 10–18 days |
| Kitchen only | Layout, gas and extraction route | from €4,500 | 12–25 days |
| Rear patio | Drainage, paving, whether it is roofed | Priced as its own item | 2–4 weeks |
Why we open holes before quoting
In anything built before 1950 an inspection opening is not optional. It is the difference between a quote that holds and one that doubles: joist bearings, ground-floor damp, roof build-up, and only then a number.
Old town
What an old-town house asks for
Houses between party walls, load-bearing masonry, floors on timber or early ceramic joists. Sound structures, generally — with five recurring weak points.
The critical points
- Where timber joists bear on the wall: rot starts at the wall, not mid-span
- Rising damp in ground-floor walls built without any barrier
- The roof: Catalan tile with no modern insulation or waterproofing beneath
- Electrics with no earth and no residual current protection
- Historic extensions built without a permit, which decide what can be legalised
Rising damp, done properly
Water climbing through masonry is stopped, not covered: an injected chemical barrier, perimeter drainage where there is access, breathable finishes above. Paint over it and the stain returns higher up the following winter. If a quote treats damp as a painting item, it is not a quote for the problem you have.
The unpermitted extension
Many of these houses grew without paperwork. Not a deal-breaker, but it decides what can be legalised. Check what is registered against what is standing, before you buy.
For non-resident owners
Buying and renovating from another country
Metro L8 and Rodalies R1 put you in Barcelona in twenty minutes at a price the city cannot match. The paperwork is local, and three terms decide how smooth it is.
Licence or comunicació prèvia
Interior work that leaves the structure alone is a comunicació prèvia. Touch the structure or a communal element — common in an old-town house — and it becomes a licence with a technical project. Sant Boi runs its own procedure. We file in your name.
Cédula d’habitabilitat
The Generalitat certificate of occupancy, valid fifteen years for an existing home, and the document that lets you let the property legally and connect utilities. In an old-town house it is also where minimum ceiling heights and ventilation get tested, so it belongs in the plan from the start.
Comunidad and derrama
In a block, the comunidad de propietarios runs the building and votes its budget: it asks us for a liability policy, agreed noise hours and lift permission. A derrama is the extraordinary levy it votes for building-wide work — lift, roof, façade — charged to owners on top of the monthly fee. Not in our quote, but yours to pay. An old-town house has no comunidad and no derrama: every repair is simply yours.
What you get while you are away
- Photographs of the inspection openings before the price is written, not after
- A fixed quote with the structural scope already inside it
- Staged reporting, decisions batched so you answer weekly, not daily
- Waste, deliveries and the skip permit handled here
Frequently asked
Renovations in Sant Boi: common questions
It depends on the structure. A 70 m² flat runs €54,600 to €112,000. An old-town house involving the roof and rising damp is priced only after inspection openings, because that is precisely where the uncertainty sits.
Cutting off the water, not hiding the stain. An injected chemical barrier in the wall, perimeter drainage where access allows, and breathable finishes above. Painting over it delays the problem by one winter and costs you the paint twice.
Almost always, and it is usually the best-value part of the job: paving, drainage, lighting, sometimes a rooflight into the interior. Roofing it over, even partially, requires a licence.
Yes, if they are healthy. Dry timber lasts decades. The risk is concentrated at the bearings, where the joist enters the damp wall. We open holes before quoting, so any strengthening is priced from the start rather than appearing mid-job.
Yes, and most of our foreign clients here do. You get a fixed quote after the technical visit, photographs of the openings before the price is written, staged reporting, and we deal with the town hall and the residents association directly.
Next step
Planning a renovation in Sant Boi?
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What we learn on site
Real housing problems in Barcelona, explained by the people who fix them.
Small kitchens
Period flats in Barcelona put the kitchen at the back, next to the gallery, with whatever metres were left over. They cannot be stretched — but they can be worked.
Duplex staircases
The staircase is the most expensive piece of furniture in a duplex and the only one you cannot return. It gets decided once — with the regulations and the floor structure in front of you.
Flat storage
Spanish flats are sold with no built-in storage at all — no closets, no basement, no attic. Where it goes instead is a small vocabulary lesson and a planning job.
Clients
What clients say after their renovation
Rated 5.0 from 14 Google reviews. All real, from real projects.
★★★★★
“Doy un 10 la verdad con el servicio que me han prestado en una reforma de un piso en Barcelona capital, gente muy seria y responsable, gracias.”
Araks SahakyanJuly 2026
★★★★★
“Quedé encantada con la atención y la calidad del trabajo. Se nota que cuidan los detalles y cumplen con lo que prometen.”
Ana RiveraApril 2026
★★★★★
“Servicio muy profesional. Me explicaron todo con claridad y el trabajo quedó perfecto.”
Ana AlemanMarch 2026
★★★★★
“Si estas buscando profesionales responsables para hacer tu reforma, es el lugar indicado. Especializados en reformas integrales con la mejor atención personalizada. 100% recomendados.”
Daniel GarganoFebruary 2026
★★★★★
“Muy buen trabajo, ha realizado un trabajo muy profesional, ha cumplido en plazo y en calidad.”
Francisco PiñeirosAugust 2025
★★★★★
“Muy buenos profesionales, con excelente resultado.”
Esther DiezJune 2026