Bioclimatic Pergolas and Enclosures: Glass, ZIP Screens and Aluminium Louvres

Designing a comfortable outdoor space on the Costa del Sol involves more than choosing a roof.

A bioclimatic pergola can regulate sunlight, shade and natural ventilation from above, but the way a terrace feels and functions also depends on what happens around its sides. Low-angle sunlight, wind exposure, privacy, views and the intended use of the space can all influence whether additional lateral protection is useful.

This is where glass enclosures, ZIP screens and aluminium louvres can complement a pergola.

Each solution performs a different function. Glass can provide greater lateral protection while preserving views. ZIP screens can help manage sunlight and privacy. Aluminium louvres can filter views and sunlight while becoming part of the architectural design.

The objective is not necessarily to enclose every side of a pergola. It is to decide which areas need protection, which should remain open and how the outdoor space is intended to be used.

If you are unfamiliar with adjustable-louvre roofs, start with our guide explaining what a bioclimatic pergola is and how it works.

The short answer: what can be added to a bioclimatic pergola?

Depending on the pergola model, configuration and project conditions, an aluminium pergola can be complemented with:

• Sliding or folding glass enclosures.
• Fixed glass panels.
• Motorised ZIP screens.
• Aluminium privacy louvres or celosías.
• Integrated LED lighting.
• Compatible wind or rain sensors.
• Other complementary equipment according to the project.

These elements do not all solve the same problem.

A useful way to think about the project is to separate overhead control from lateral protection.

The pergola roof manages conditions from above. Lateral elements can then respond to specific requirements around the perimeter.

This approach allows the project to remain open where views and circulation matter while adding protection or privacy only where it provides a real benefit.

The bioclimatic roof: controlling the space from above

A bioclimatic pergola uses adjustable aluminium louvres to change the relationship between sunlight, shade and natural ventilation.

By changing the position of the louvres, the user can create different levels of shade, allow natural light to enter or promote airflow through the roof.

When the louvres are closed, the pergola can also provide protection during moderate rain while integrated drainage directs water towards the structure’s drainage points.

In our bioclimatic systems, the aluminium louvres incorporate an internal air chamber. This construction feature helps limit the direct transmission of heat through the aluminium when the roof is closed, although it should not be understood as complete thermal insulation.

Current Pérgolas Sunset systems use motorised operation. Depending on the selected model and configuration, compatible sensors or automation may also be incorporated.

Motorisation and automation are not the same thing: a pergola can be motorised without using climatic sensors.

For projects where different roof systems are still being considered, our guide to the advantages of a bioclimatic pergola compared with other outdoor roof systems explains the differences between adjustable louvres, retractable roofs and fixed covering solutions.

Why lateral protection matters

A roof alone does not determine the comfort of an outdoor space.

Sunlight can enter at a low angle in the morning or afternoon. An exposed side may receive more wind than another. A neighbouring property may create a privacy issue, while another side of the terrace may have a view that should remain completely open.

For this reason, an enclosure should not automatically be understood as closing the entire pergola.

The questions are more specific:

• Where does low-angle sunlight enter?
• Which sides need more privacy?
• Which views should remain open?
• How open should the terrace feel?
• Will the area be used for dining, relaxing or entertaining?
• Is additional lateral protection useful during particular seasons?
• Could the use of the space change in the future?

Glass, ZIP screens and aluminium louvres provide different answers to these questions.

Glass enclosures: protection without losing the view

Glass is particularly useful when greater lateral protection is required but preserving visibility is important.

Depending on the project, a pergola may incorporate sliding, folding or fixed glass elements.

They can help create a more protected perimeter while maintaining the visual relationship with a garden, pool, sea view or surrounding landscape.

Glass can be especially relevant for:

• Dining areas.
• Lounge spaces.
• Terraces with attractive views.
• Properties exposed from one or more sides.
• Outdoor areas intended for use during more months of the year.
• Projects where transparency is preferable to an opaque lateral enclosure.

However, adding glass does not turn a pergola into the equivalent of a conventional interior room.

A pergola remains an exterior structure, and its level of protection depends on the selected systems, configuration and weather conditions.

This distinction is particularly important when the objective is to extend the seasonal use of the terrace without creating unrealistic expectations of complete enclosure or absolute weather protection.

ZIP screens: managing lateral sunlight and privacy

A ZIP screen is a vertical textile screen guided along its sides.

It can be particularly useful where direct sunlight enters below the roof line, especially on exposed façades during the morning or afternoon.

Depending on the selected fabric and configuration, ZIP screens can help with:

• Low-angle solar exposure.
• Glare.
• Privacy.
• Visual filtering.
• Creating a more sheltered feeling around part of the pergola.

When raised, the perimeter can remain substantially open. When lowered, the screen changes the relationship between the covered area and its surroundings.

This flexibility makes ZIP screens particularly useful for terraces where permanent lateral enclosure is unnecessary.

For example, a dining area may need protection from afternoon sun only during certain hours, while a lounge facing a garden may benefit from remaining completely open most of the time.

ZIP screens should therefore be considered as complementary solar and privacy elements, not as substitutes for a structural wall or a promise of complete weather protection.

For more ideas on adapting an outdoor area to different seasons, see How Can I Enjoy My Pergola All Year Round?.

Aluminium louvres: privacy, solar filtering and architectural design

Aluminium louvres, commonly known in Spain as celosías, provide another way to define the perimeter of an outdoor space.

Unlike transparent glass or retractable textile screens, aluminium louvres become a more permanent visual element within the architecture.

Depending on the system, they can help:

• Increase privacy.
• Filter lateral sunlight.
• Partially screen neighbouring properties or circulation areas.
• Define different outdoor zones.
• Complement the colour and design of the pergola.
• Maintain a degree of openness and ventilation.

This makes them particularly interesting where privacy and architectural integration are as important as solar protection.

A villa, for example, may have one side of the pergola facing the garden and another facing a neighbouring property. Keeping the garden side open while using aluminium louvres on the more exposed side can provide a different balance from enclosing the entire perimeter.

The appropriate configuration depends on the project and the selected system rather than on a universal module or arrangement.

For broader projects involving bespoke exterior structures, see our guide to Custom Aluminium Structures for Terraces and Outdoor Spaces.

Glass, ZIP screens or aluminium louvres: which should you choose?

There is no single enclosure system that is best for every side of a pergola.

The most useful starting point is the problem that needs to be solved.

This table is an initial orientation rather than a technical prescription.

A single pergola can also use different solutions on different sides.

For example, a project might preserve an open view towards the pool, use glass on a more exposed side and incorporate a ZIP screen where afternoon sunlight enters.

The objective is not to add as many elements as possible. It is to configure the perimeter according to the actual use and conditions of the space.

Can different enclosure systems be combined?

Yes, depending on the pergola, configuration and technical feasibility of the project.

Glass, ZIP screens and aluminium louvres are not mutually exclusive.

Different sides of a terrace can have very different requirements, particularly in villas, penthouses and hospitality spaces.

A combination may make sense when, for example:

• One side requires privacy.
• Another needs solar control.
• A third should preserve a view.
• Another should remain open for circulation between the terrace and garden.

This is one reason why the project should be considered as a complete outdoor space rather than simply as a roof with accessories added afterwards.

At the same time, more equipment does not automatically mean a better result. Every additional element affects the visual appearance, use and investment required.

Planning today for possible future enclosures

Not every project needs glass, screens or aluminium louvres from the beginning.

A homeowner may initially want only the pergola and later decide that additional privacy, solar control or lateral protection would make the terrace more useful.

For that reason, it can be valuable to discuss possible future needs during the initial project.

This does not mean that every pergola must be prepared for every possible accessory.

It means asking a simple question early:

How might this outdoor space be used in the future?

The answer may influence the choice of pergola, overall configuration and relationship between the structure and the surrounding space.

Thinking ahead can be particularly useful when:

• The terrace may later become an outdoor dining area.
• Greater privacy could be required.
• The property is exposed from a particular side.
• A neighbouring plot may be developed.
• Seasonal use of the terrace may increase.
• Glass or screens are being considered as a second phase of the project.

Where future additions are important, their compatibility should be considered when the original pergola is defined rather than assumed afterwards.

Villas and gardens: openness, views and different outdoor zones

Villas generally provide more freedom to connect a pergola with gardens, swimming pools, outdoor kitchens, dining areas and lounge spaces.

This does not necessarily mean that a larger or more enclosed pergola is preferable.

The relationship between the covered area and the rest of the property is often more important.

A pergola beside a swimming pool may benefit from remaining very open. A dining area closer to the house may require more protection from low-angle sunlight. A lounge near a property boundary may need additional privacy.

Thinking in terms of zones and uses helps determine where glass, screens or louvres actually add value.

For a broader approach to the surrounding space, see How to Design the Perfect Outdoor Space Around Your Pool and Garden on the Costa del Sol.

Terraces and penthouses: exposure and openness require careful balance

A penthouse presents a different context from a ground-level garden.

Elevated terraces can be more exposed, while access and the relationship with the existing building can also influence the project.

Adding lateral elements changes how open the pergola is to its surroundings. Glass, screens or louvres should therefore be considered as part of the overall configuration rather than selected only for appearance.

Views are often especially valuable in penthouses, which makes selective enclosure particularly relevant.

Instead of closing every side, the project may need to preserve the principal view while addressing sunlight, privacy or exposure elsewhere.

For more detail on these differences, see our comparison of villa and penthouse pergola installations on the Costa del Sol.

What should be considered before choosing enclosures?

Before deciding between glass, ZIP screens, aluminium louvres or a combination, it is useful to define how the space is expected to function.

Questions worth considering include:

• What will happen beneath the pergola: dining, lounge, poolside use or several activities?
• Which sides receive direct sunlight?
• Is privacy required permanently or only at certain times?
• Which views are important?
• How open should the space feel?
• Is the terrace used throughout the year or mainly during particular seasons?
• Are future additions likely?
• What level of investment is appropriate for the intended use?

These questions help establish the project priorities before individual products are selected.

For projects that are still at an early stage, our guide on what to know before requesting a pergola quote explains what information is useful before asking for a proposal.

Pergola, enclosures and the architecture of the property

A pergola and its lateral elements should relate to the architecture rather than appear as unrelated additions.

Colour, proportions, openness, views and the relationship with doors, windows, terraces and gardens all influence the final result.

This becomes particularly important when several elements are combined.

Glass is visually transparent but changes the sense of enclosure. ZIP screens introduce textile surfaces when lowered. Aluminium louvres become part of the permanent architectural composition.

The appropriate balance therefore depends not only on protection but also on how the exterior should relate to the building and landscape.

This is one reason why the same combination is not appropriate for every villa, apartment, restaurant or hotel.

Motorisation, sensors and controls

Motorisation can make roof and screen operation easier in everyday use.

Pérgolas Sunset’s current pergola systems are motorised, and motorised ZIP screens may also be incorporated depending on the selected configuration.

Compatible climatic sensors may be available depending on the model and system.

However, motorisation should not be confused with automation.

A motor allows an element to move electrically. Automation adds controls or sensors that can trigger particular actions according to the equipment installed.

The appropriate level of control depends on the system and how the outdoor area will be used.

Rain protection and enclosures

A bioclimatic pergola with closed louvres can provide protection during moderate rain while directing water towards integrated drainage.

Adding lateral elements can increase protection around particular sides of the covered area.

However, neither a pergola nor its complementary enclosures should automatically be interpreted as creating a completely watertight interior room.

Weather conditions, lateral exposure and the configuration of the project influence the level of protection experienced beneath the structure.

Glass, ZIP screens and aluminium louvres also perform differently.

Glass can provide greater lateral closure. ZIP screens are primarily useful for solar control and privacy, with their additional protection depending on the selected system. Aluminium louvres filter rather than completely seal the perimeter.

The appropriate combination should therefore reflect the level of protection actually required.

Maintenance and long-term use

Pergolas and enclosure systems are exterior elements and require appropriate maintenance.

The requirements vary according to the selected equipment and the environment.

Glass needs cleaning to preserve transparency. ZIP screens and their moving components should be maintained according to the manufacturer’s recommendations. Aluminium elements require periodic cleaning, particularly in environments exposed to dust, vegetation or coastal conditions.

The pergola roof and drainage areas should also be kept clean and checked periodically.

Thinking about maintenance when selecting a configuration can help avoid unnecessary complexity, particularly when the terrace contains several different systems.

When you may not need an enclosure

One of the most important decisions can be not to close a side of the pergola at all.

If a terrace is naturally sheltered, has attractive open views and is primarily used in favourable weather, additional enclosures may provide little benefit.

Likewise, if the only issue is occasional afternoon sun, a ZIP screen on one side may be more proportionate than glazing the entire perimeter.

A successful outdoor project is not measured by how much equipment it contains.

It is measured by how well the configuration responds to the way the space is actually used.

Planning and community considerations

Depending on the property, location and scope of the project, planning, community or other property-related requirements may apply.

This can be particularly relevant in apartment buildings, penthouses and properties within residential communities.

Requirements should therefore be checked for the specific property before installation rather than assuming that the same rules apply to every project or municipality.

Frequently asked questions

Can a bioclimatic pergola be enclosed with glass?

Glass can be incorporated into many pergola projects when the selected structure, configuration and project conditions are suitable. It can provide additional lateral protection while preserving views and natural light.

Can ZIP screens be added to a bioclimatic pergola?

Depending on the pergola model and configuration, motorised ZIP screens can be integrated to help manage low-angle sunlight and privacy.

What is the difference between glass and a ZIP screen?

Glass provides a transparent physical enclosure, while a ZIP screen is a retractable textile element primarily used for solar control, privacy and visual filtering. They therefore perform different functions.

What are aluminium louvres used for?

Aluminium louvres or celosías can provide privacy, filter lateral sunlight and become part of the architectural design of the outdoor area.

Can glass, ZIP screens and aluminium louvres be combined?

They can be combined in suitable projects. Different sides of the same pergola may require different solutions depending on views, sunlight, privacy and intended use.

Do I need to enclose every side of the pergola?

No. Selective enclosure can often provide a better balance between protection, views, circulation and openness.

Can enclosures be added later?

In many cases they can, provided the original pergola and configuration are compatible with the proposed addition. If future enclosures are being considered, it is useful to discuss them during the initial project.

Will glass make a pergola completely weatherproof?

A glass enclosure can increase lateral protection, but a pergola should not automatically be considered equivalent to a completely sealed conventional interior room. The overall level of protection depends on the complete system and conditions.

Are ZIP screens suitable for wind protection?

ZIP screens may provide some additional lateral protection depending on the product and conditions, but their primary roles include solar control and privacy. Their suitability should be considered according to the actual system and exposure.

Which enclosure is best for a sea view?

Where preserving the view is a priority, glass may be worth considering because of its transparency. However, some sides may be better left open or use another solution depending on sunlight, exposure and privacy.

Is it better to install the enclosures at the same time as the pergola?

Not necessarily. Some projects are completed in phases. What matters is considering likely future requirements early enough to determine whether the proposed pergola and configuration are compatible with them.

Choosing the right combination

A bioclimatic pergola, glass enclosure, ZIP screen and aluminium louvre each solve a different part of the outdoor-space problem.

The pergola controls sunlight, shade and natural ventilation from above.

Glass can increase lateral protection while preserving views.

ZIP screens can provide flexible solar control and privacy.

Aluminium louvres can create more permanent privacy and architectural definition.

The best project is therefore not necessarily the one that combines every available element.

It is the one that determines where protection is useful, where openness matters and how the terrace should function throughout the year.

For properties on the Costa del Sol, this can be particularly important because sunlight, views, exposure and outdoor living frequently coexist within the same space.

At Pérgolas Sunset, we design and install aluminium pergolas and complementary solutions for villas, penthouses, terraces, gardens and commercial outdoor spaces on the Costa del Sol, throughout Andalucía and in Castilla y León.

If you are considering a pergola with glass, ZIP screens or aluminium louvres, you can contact Pérgolas Sunset, explore our pergola catalogue or review our gallery of completed projects.

Spanish version: Guía de Pérgolas Bioclimáticas y Cerramientos