Frequently asked questions about glass curtains, pergolas and patio roofs

As a 2026 market guide, between €250 and €450/m² installed for folding and sliding systems, and a little more for stacking ones. A 5 x 2.5 m front comes to roughly €3,100 to €5,000. We give you the exact price free of charge after measuring.

They are made of toughened safety glass, several times stronger than ordinary glass. If it does break from a very hard blow, it shatters into small pieces without sharp edges. The locks stop the panels being opened from outside.

They protect very well against wind, rain, dust and much of the street noise. They are not a thermally broken window: since they have no vertical frames, they are not airtight. If you want full thermal insulation, we recommend windows or a thermally broken aluminium enclosure.

Glass curtains keep the view clear, fold away completely and do not change the look of the façade. A thermally broken aluminium enclosure insulates better and turns the terrace into another room. It depends on whether you want an open, protected terrace or an extra room.

As a guide, between €350 and €500/m² with manual louvres and between €450 and €750/m² motorised. With sensors, lighting and side enclosures it can exceed €1,000/m². The size, whether it is attached or freestanding, and the extras all play a part.

With the louvres closed, the roof is watertight: the water runs along gutters built into the louvres and down through the posts. With a rain sensor, the louvres close by themselves when it starts to rain. With rain and strong side winds, some water may get in through the sides if they are open.

A properly sized and anchored pergola withstands the usual winds in the area. In strong gusts it is best to leave the louvres open, and the wind sensor does this automatically. To close the sides against the levante, the ideal is to combine it with glass curtains or screen blinds.

The powder-coated aluminium structure is designed to last many years without corroding, even near the sea. The parts that need most attention over time are the motor and the electronics, which can be serviced or replaced.

Very little: clean the louvres and gutters with water and mild soap a couple of times a year and remove any leaves or sand. In coastal areas it is best to rinse off the salt more often. If it is motorised, have the motor checked from time to time.

A bioclimatic pergola has adjustable louvres that control sun, shade and ventilation, and they close against the rain. A fixed pergola has a roof that does not move, whether panels, glass or tensioned canvas. The bioclimatic one gives more control; the fixed one is cheaper.

A retractable roof opens and closes by sliding its panels, so you can have open sky or cover depending on the day. A fixed roof gives permanent cover and is cheaper. Both can be combined with glass curtains around the perimeter.

Yes. Photovoltaic glass roofs integrate solar cells into the glass itself: they give shade and generate electricity at the same time. They are a good option for porches, pergolas and carports with a good orientation.

It is an external roller blind made of technical fabric that filters sun and heat without blocking the view outside. It runs in side tracks, so it withstands wind better than a folding-arm awning. It can be manual or motorised.

For direct afternoon sun, a vertical screen awning or an external roller screen stops the heat before it reaches the glass. Indoors, blinds and shutters from brands such as Bandalux. We will advise you according to the orientation and how you use the space.

It depends on the town hall. In many municipalities a prior notification or a responsible declaration (declaración responsable) is enough, while others require a minor works licence. Before installing, we tell you which procedure your municipality usually asks for so that you can check it.

If you live in a block of flats, usually yes, because the enclosure affects the façade, which is a communal element. The majority required depends on the case and on the building's rules. Many residents' associations approve a common enclosure design for the whole façade.

It usually requires at least a notification to the town hall, and in some municipalities a minor works licence. If it is on a block of flats, you also need the approval of the residents' association. We will advise you on the usual procedure in your area.

It may count towards the built floor area for planning and land-registry (catastro) purposes, depending on the type of enclosure and the local regulations. That is why it is worth checking with the town hall before the work.

Yes. The visit, measuring and quote are free and with no obligation throughout the province of Cádiz. You can ask for one by phone or WhatsApp on 665 26 11 55 or by email at info@kristall.es.

A standard terrace is usually fitted in a single day, with no building work. Before that you need to allow for the made-to-measure manufacturing time, which we state in the quote. Pergolas and roofs may take a day or so longer.

All our products and installations come with a guarantee, which we set out in writing in the quote. And as a local company in El Puerto de Santa María, we are close by for any adjustment or service.

With water and an ordinary glass cleaner; when you open the panels you can clean both sides from inside. It is a good idea to clean the tracks now and then so that sand does not build up, especially near the beach.

It depends on the number of openings, the material (PVC or thermally broken aluminium) and the glass. The best thing is a free survey. In some cases, part of the investment can also be deducted from income tax (IRPF) or qualify for grants, depending on the programme and the current call for applications.

Throughout the province of Cádiz: El Puerto de Santa María, Cádiz, Jerez, Puerto Real, San Fernando, Chiclana, Rota, Sanlúcar and the surrounding area.