People looking for a construction company in the Maresme rarely have a flat with a lift. They have a terraced house in the centre of Premià de Mar or Vilassar de Mar, a 1970s villa in the upper part of Premià de Dalt or Alella, or a plot where they want to build from scratch. These projects are different from those in Barcelona city, and they are priced differently.
Our site office is at Carrer Gibraltar 44, Premià de Mar. From here we run projects across the area: the Priorat full renovation in Alella, handed over in 16 weeks, and the dental clinic in Montgat, handed over in September 2026. This guide collects what we explain at every first visit.
1. What changes when the project is a house
In a flat, almost the whole budget goes to the interior. In a Maresme house, you also pay for the parts a building's owners' association covers in a flat: roof, façade, exterior windows, drainage and sometimes the plot's retaining wall. That is why two 150 m² projects can have very different budgets.
Then there is the climate. Humidity and salt air reach several kilometres inland. They attack mortar, reinforcement and fittings, and they wear out aluminium windows without thermal breaks. Ground floors of older houses often show rising damp. None of this shows up on a quick visit, and all of it changes the budget.
"In the Maresme, the building envelope matters as much as the interior. If a quote only covers bathrooms and kitchen, half of it is missing."
2. Town by town
Each town in the area has its own council, its own by-laws and its own typical housing. This is what we see most often:
| Town | Typical housing | What to check |
|---|---|---|
| Premià de Mar | Terraced houses in the old centre and flats from the 1960s and 70s | Original structure, ground-floor damp, old installations |
| Premià de Dalt | Detached houses, often on slopes | Roof, retaining walls, truck access |
| Vilassar de Mar | Village houses and flats near the sea | Salt damage on façade and windows |
| El Masnou | Flats and houses near the marina, detached houses higher up | Façade, terraces, waterproofing |
| Alella | Detached houses with gardens, some among vineyards | Envelope, attics, insulation |
| Mataró | A wide mix: city flats, terraced and detached houses | Depends on the area; decided at the visit |
Permits are always filed with the council of the town where the works take place. A file prepared for Barcelona city is no use in Alella or Mataró.
3. Permits: what each case needs
In Catalonia, each council sets out the details in its own by-laws, but the general scheme is the same across the area:
- An interior renovation that does not touch the structure, façade or roof is usually filed as a prior notice for minor works (comunicació prèvia). It is quick, but it must be filed before starting.
- If the works affect the structure, façade, roof, volume or use, you need a major works licence, with a project signed by an architect.
- A new build is always major works. Once finished, you apply for first occupancy and the habitability certificate before moving in.
- The council charges a construction tax (ICIO) on the material execution budget. Each town sets its own rate, with a legal maximum of 4%.
Premià de Mar Town Council, for example, offers both procedures online: prior notice for minor works and major works licence. Before quoting, we check which one applies, because the permit timeline sets the real start date.
If the plot is close to the coast, it is also worth checking whether the Coastal Law (Ley de Costas) applies. It is a quick check that avoids designing something that cannot be built.
4. Prices and timelines in 2026
The ranges we work with in the area, as a guide before seeing the property:
| Type of project | Guide price | Construction time |
|---|---|---|
| Full flat renovation | €900–1,200/m² | 3 to 5 months |
| Full house renovation including envelope | €1,200–1,600/m² | 4 to 8 months |
| New detached house | €1,800–3,500 per built m² | 10 to 18 months, plus permit |
New build prices exclude the plot, design fees and taxes. What moves the price most is the foundation, depending on the ground, the quality of exterior windows and the heating and cooling system. To see how a budget breaks down line by line, read our 2026 full renovation price guide: the logic is the same, only the physics of the site change.
We work with itemised budgets and weekly progress certification. Clients pay for work completed, and they see it on the project tracking dashboard with photos and documents.
5. What to check before buying or starting
Many enquiries reach us before the purchase. These are the checks that save the most money:
- In homes built between the 1950s and 1970s, confirm the beams are not made of high-alumina cement. An inspection detects it, and it changes the whole scope.
- Check the condition of the roof and downpipes. In houses, it is often the item buyers did not expect.
- Look for damp on ground-floor walls and in basements.
- Check whether the electrical and plumbing installations can be reused or must be replaced.
- Look at access to the plot: narrow streets and slopes make material deliveries and skips more expensive.
If you are about to buy, a technical visit before signing usually costs far less than any of these surprises.
6. How we work in the Maresme
We are a construction company with more than 100 completed projects in Barcelona, the Maresme and Valencia. In the Maresme, site visits leave from Premià, a few minutes from most projects. The process is always the same: a visit to the house or plot, survey, itemised budget, permit with the right council, construction with a single site manager as your contact, and handover.
If an architect has a project, we build it. If not, we coordinate the technical team. On projects with architecture studios we work as the execution contractor for architects, with the site supervision team connected to the same dashboard as the client.
You will find more detail on prices and towns on our page on renovations in Premià de Mar and the Maresme. If you already have the house or the plot, the most useful thing is to meet there.
Frequently asked questions
How much does it cost to build a house in the Maresme in 2026?
Between €1,800 and €3,500 per built m² for a mid-to-high-end detached house, excluding the plot, fees and taxes. Construction usually takes 10 to 18 months, plus the permit.
How much does it cost to renovate a house in the Maresme?
Between €900 and €1,600 per m². If the renovation includes the roof, façade and exterior windows, the price moves to the top of the range.
What permit do I need to renovate a house in Premià de Mar?
If the structure and façade are untouched, usually a prior notice for minor works. If the structure, façade, roof or volume changes, a major works licence with a project. Both are filed with Premià de Mar Town Council.
Where are Maresme projects managed from?
From our office at Carrer Gibraltar 44, Premià de Mar. Phone +34 930 31 41 41.