How Maresme villas differ from other coastal houses
The villas of Alella, Sant Andreu de Llavaneres and Cabrils sit on the slopes of the coastal range above the sea, not on a flat shoreline. So the renovation is shaped by gradient, granite ground, nearby woodland and the access road, not by salt as it is near the beach.
Houses in these towns were generally built as country residences with large plots, terraces and sea views. Alella is known for its vineyards and wine area; Llavaneres and Cabrils for green developments among pines. Many owners live here all year and others only seasonally; either way the renovation should be manageable remotely.
For a renovation that means three things: the plot always has level changes, services (water, gas, drainage) often run along private roads, and the neighbours are close to the eye but far in distance. Any extension is checked against the local plan and against forest fire protection.
What the ground is like in the Maresme
In the Maresme the slopes are mostly weathered granite, locally called sauló. It carries load well but erodes with water and can slide, so slopes need retaining walls and drainage.
In practice it looks like this. For an extension or a pool, the geotechnical engineer reports on bearing capacity and slope stability. Excavation uses a digger with a hydraulic breaker: rock pockets turn up at different depths and change the price of earthworks. A sloping plot needs storm drainage: rain here is short but heavy, and water runs down the slope washing out the fill.
What matters for you is slope stability and the state of old retaining walls. They are checked during the house survey, and if a wall is old, the drainage behind it is often redone at the time of the extension.
Fire safety on plots next to woodland
For houses next to woodland, Catalonia has forest fire prevention rules: in developments not continuous with the built-up area, a protection strip and vegetation upkeep are required. For your house this affects both the boundary and the trees on the plot.
Law 5/2003 and Decree 123/2005 oblige municipalities to approve a map delimiting such zones and to monitor the protection strips. On the plot, owners must manage vegetation: thin trees, remove dry branches and undergrowth, and keep combustible materials away from the house. For new build and extensions in these zones the town hall may set additional conditions.
Materials count too. Non-combustible roof and facade, metal screens on ventilation openings, metal shutters rather than timber, and access that a fire engine can use are decisions worth building into the design. The specific requirements for your plot are confirmed with the town hall and the fire service.
Slope restrictions in the Maresme and how to keep the view when extending
Extending on a slope is limited by height, the silhouette of the house and setbacks, and these decide whether the view survives. You start by finding the available volume, not the square metres you want.
A common approach is to extend along the slope rather than up: the new room is cut into the hillside, stays below the roofline, and its roof can be a terrace. Another is to extend downwards, sinking the lower floor into the terrain. For the view, the level of the living-room floor and the height of the parapet matter: sometimes 30 or 40 cm decide whether you can see the sea from a seat.
Neighbours play a role as well. Distance to the next house, shadow and views from its windows are checked against the plan, and the town hall can refuse if the extension blocks them. So before a sketch we build a 3D model with real levels and shadows at different times of day.
Working on a slope and along narrow roads
On a slope the build is organised around the road: a tight bend and the gradient decide whether a concrete mixer reaches the site, and light materials have to be carried by hand. This goes into the estimate before the first day.
What gets checked before starting. The width and bend radius of the access road. Whether a crane can be set up and where. Where the storage, skip and site cabin go. Whether temporary retaining walls are needed so the bank does not collapse during excavation. How to protect a tree that cannot be felled.
Green developments have common rules: working hours, waste removal, weight limits for machinery on private roads. These are worth asking the development's administration about. Private roads sometimes belong to the neighbours or an association, and heavy machinery will not be let through without their consent.
Interior considerations and where to start
A Maresme house is designed around the view and the light, and interior decisions follow from them. Large panes facing south and the sea need protection from overheating, and stone and timber finishes must withstand the swing between winter and hot summer.
In practice such houses get sliding glazing with solar shading, awnings and louvres over terraces, underfloor heating and a heat pump for heating and cooling, and solar panels on the roof. To make the most of the view, windows are planned in walls, not just towards the terrace. If the house is large, separate climate zones and back-up power are calculated.
Premium renovations start from 3,000 EUR/m2 excluding VAT at the Luxury level, and the exact price is set in the estimate after the visit and measurements. We run projects in Russian and Spanish, with our own crew and vetted subcontractors, and one person responsible for the job.
Frequently asked questions
What are the building restrictions on Maresme slopes?
Height, silhouette, setbacks and the maximum gradient around the house are limited. Slopes need retaining walls and storm drainage, and near woodland fire prevention rules apply. The plot's parameters are requested from the town hall before the sketch. Everything is checked against the local plan for a new design, so the plot statement is requested before the first sketch.
What should I do about fire safety if my house is next to a forest?
Maintain the protection strip: thin trees, clear dry branches and undergrowth. Build into the design a non-combustible roof and facade, metal screens on ventilation and access for a fire engine. Specific requirements are confirmed by the town hall and the fire service.
How do I keep the sea view when extending a villa?
Extend along the slope or downwards, not upwards, and keep the new volume below the roofline. Check floor level and parapet height; sometimes 30 or 40 cm decide it. Build a 3D model with real levels and shadows before the sketch.
What is the ground like in Alella and Llavaneres?
Mostly weathered granite, sauló: it carries load but erodes with water and can slide on a slope. Rock pockets occur. For extensions and pools, a geotechnical report is in practice essential. Rock pockets turn up at varying depth, so earthworks are priced with a margin.