Oseja de Sajambre

Can you build a house on rustic land?

Castilla y León allows a new house on rustic land only when a farm needs it. Otherwise it has to go in a village, or restore a building.

Ley 5/1999, art. 23.1.e. A town plan can be stricter.

Plan in force: Normas Subsidiarias (an older, simpler plan), from 2000. The region's planning viewer ↗

The national urban information system (SIU) maps the land class for 100% of the municipality.

Only the town hall can confirm it, in writing: ask for a certificado urbanístico.

Is there water?

No well or borehole is recorded in Oseja de Sajambre. That is not proof there is no water: ask local drillers. 16 springs are recorded.

Ground: 35% practically impermeable; 34% karstic or fissured aquifer, medium productivity; 31% low permeability, local groundwater only.

Choosing where to drill takes a hydrogeologist.

What to watch for

• 4 fires since 2016 reached the municipality: 1,323 ha in all, the latest in 2026.
• No mapped flood zone (only studied rivers are mapped).
• 100% of the municipality is Natura 2000: new works need the region's consent.
• 100% of the municipality is a protected natural area, whose plan limits what can be done.
• Radon zone I: new and restored homes need radon protection by law.

Living here

• 4G reaches 100% of homes; fibre 42%. Averages for the municipality.
• Rain: 1,332 mm a year (1971–2000), about 1,165 by 2041–2070.
• Summer highs: 20.5 °C, about 23.8 °C by 2041–2070.
• Frost days: 126 a year, about 90 by 2041–2070.

Around it

Burón · Posada de Valdeón · Ponga · Amieva