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Guide · VentanaCosta

What is an enclosure and what types exist

Updated: August 2026 · 4-6 minute read

An enclosure (cerramiento) is the structure that closes an open space of a home or business (terrace, porch, balcony, patio) with aluminium or PVC profiles and glass, turning it into a weather-protected room.

Depending on the system, an enclosure can be a simple barrier against wind and rain or a fully insulated extra room. These are the types we install every day.

Types by system

TypeWhat it isWhen it suits
Glass curtainFolding panels without vertical profilesViews and looks, demanding communities
Aluminium slidingFramed sashes, single or insulated glassPrice-insulation balance
PVC sliding / casementMaximum thermal and acoustic insulationHeated rooms all year round
Fixed or movable roofPolycarbonate or glass coverTerraces without an existing roof

Types by space

Does it count as built area?

A fixed terrace or porch enclosure may count as built area for planning purposes depending on the municipality, which is why it needs a minor-works licence. Folding glass curtains, treated as a movable element, get a more flexible treatment in many bylaws.

Not sure which system fits your space?

In a free visit we propose the right system and glazing for your orientation, use and local rules.

See enclosures

Frequently asked questions

What is the cheapest enclosure?+

Frameless glass curtains, from about €250/m² installed. Framed systems with insulated glass run €350-600/m².

Does an enclosure block noise?+

Yes: toughened glass cuts noise noticeably, and insulated glazing in PVC frames can exceed 40 dB of attenuation.

How long does an enclosure last?+

Quality aluminium and PVC profiles exceed 40 years on the coast; toughened glass does not degrade in the sun.

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