A pergola turns a seating area into a room. It gives shelter, frames the view and carries climbing plants. What it cannot do is often overlooked: an open pergola does not keep out rain, and it only gives shade once something grows or lies on top. This article goes through the decisions in order: what the pergola should do, which type suits, which material, which plants, where it belongs and whether you need a permit. Two explained examples with a top view or sketch show how it fits together.
All gardens on this page are AI visualisations by GardenPilot, not built gardens. They show design ideas, not construction plans.
At a glance
- Open means: no rain protection. A pergola with slats gives partial shade. If you want to sit in the dry, you need a roof, and then it is often a terrace roof in legal terms.
- Shade comes from above: from climbing plants, a shade sail or louvres. It usually takes several years for plants to cover a pergola fully.
- Plant and structure have to match. Roses are tied in, clematis needs a grid, wisteria a very sturdy structure. Wisteria is also poisonous.
- No fire bowl under the pergola. Timber, climbing plants and flying sparks do not mix.
- In Germany, whether you need a permit depends on your federal state. In Bavaria, pergolas are exempt from the permit procedure. The often-quoted rule "up to 30 m² and 3 m high" is not what the law says.
1. What should the pergola do?
Before you choose a type, be clear about what the pergola is for. That determines what it needs on top:
| Aim | What it needs | Keep in mind |
|---|---|---|
| Frame for the seating | open pergola | works straight away |
| Shade | plants, sail or louvres | plants take years |
| Rain protection | solid roof | legally usually a roof structure |
| Green over the path | walkway with climbers | needs care and pruning |
In the picture, a timber pergola with an open slatted roof stands over a seating group. Climbing roses grow up the posts and over the slats. Where they are dense, they cast shade; in between, light comes through. On a summer afternoon that is pleasant. In the rain, the sofa still gets wet.
2. Types with examples
Example 1: Freestanding pergola with a fabric roof over the dining area
- Starting point: a garden behind a house with a lot of pale natural stone paving. At the other end of the garden, opposite the house, a dining area is to be created. A sunny position is assumed.
- Key decision: The dining area does not sit against the house wall but under a freestanding pergola at the other end of the garden. Beneath it are a corner bench with cushions, a timber table and chairs. The roof consists of pale fabric panels between the beams. The way there leads past a round planting ring and a water channel. The fire bowl does not stand under the pergola but on a gravel area of its own on the other side of the channel, under the open sky.
- Transferable principle: Each use gets its own place: dining under the roof, fire in the open. The pergola gives the dining area a room; the gravel area gives the fire bowl distance.
- Limitations: Fabric panels catch wind and pull on the structure (see section 7). The way from the house to the dining area is long; dishes and food are carried through the whole garden. The open water channel is a risk with small children, because they can drown in just a few centimetres of water.
- Simpler variant: a dining table with a large parasol in the same place, the fire bowl still on its gravel area. The sense of a room is weaker, the effort much lower.
How much space a dining table needs and which surface suits it is covered in the article Modern garden with a terrace.
In a corner by the wall
A pergola does not have to stand freely in the garden. In a corner between two walls, the walls close off the spot on two sides and the pergola gives it a frame above. In the picture, a timber corner bench stands beneath it and a climbing rose grows on the front post. If the pergola is to be fixed to the wall, the same applies as for the house wall: have it checked first whether the wall can carry it. If the wall is on the boundary, talk to your neighbours beforehand (see section 5).
As the destination at the end of a path
A pergola at the end of the garden gives the eye a destination and the path a reason. In the picture it is densely overgrown and stands beyond a sequence of steps, water bowl and beds. That suits longer gardens where a second seating area is wanted. What paths to it can look like is covered in the article Garden paths.
Example 2: A frame without a roof
- Starting point: a garden by a modern house whose terrace already has a timber canopy. A second seating area is to be created in the lawn. A sunny garden is assumed.
- Key decision: Instead of a second pergola with a roof, only a ring of Corten steel on slender supports stands over the round seating area. Multi-stemmed birches in the middle provide the shade. A path of natural stone slabs leads there from the terrace. The fire bowl stands at another seating area at the back in front of the garden wall, with no roof above it.
- Transferable principle: A pergola does not have to be rectangular or have a roof. A frame alone marks out a room. A tree can take over the shade.
- Limitations: The ring itself gives no shade and no shelter. Birches grow tall over the years, drop leaves and seeds, and their pollen is a problem for many allergy sufferers. A ring of this size is a custom piece.
- Simpler variant: a tree with a light canopy over the seating area and a rose arch at the entrance.
With louvres or a solid roof
In the picture, a metal pergola stands right by the house over the dining area. Its roof consists of transparent panels. That keeps out rain, but in Germany it is then usually no longer a pergola in legal terms but a terrace roof (see section 6). Pergolas of aluminium or steel are also available with rotating louvres. Open, they let light and air through; closed, they keep out rain. This, too, blurs the line to a terrace roof. A closed roof also catches wind. Foundations and fixings must be designed for it; the manufacturer provides the details. If the pergola is fixed to the façade, the note in section 5 applies.
3. Timber or metal?
The cover image shows a pergola of rough, untreated timber beams in front of a stone house, covered in roses. Elsewhere in this article you will find timber pergolas with climbing roses, a pergola with slender pale posts and a fabric roof, a Corten steel ring and a metal pergola with a transparent roof.
- Timber looks warm and suits climbing plants. Timbers vary a great deal in how long they last outdoors. The standard EN 350 sorts them into five classes, from "very durable" to "not durable". Ask for the class when you buy. Posts last longer if they do not stand in the soil but on a post base above the ground. Untreated timber turns grey over time.
- Steel and aluminium allow slender profiles and large spans. Aluminium does not rust; steel needs galvanising or a coating. Corten steel forms a rust layer that protects it. In the early period, though, it can shed rust and stain pale stone slabs beneath it.
Timber or metal: with climbing plants, what counts is that the structure carries the weight for years. More on that in the next section.
4. Climbing plants: shade, weight and toxicity
Climbing plants climb in different ways. That determines what they need on the pergola:
| Plant | Climbs as | Needs | Keep in mind |
|---|---|---|---|
| Climbing rose | scrambler | horizontal supports, tying in | thorns near the seating |
| Clematis | tendril climber | grid or wires | — |
| Grapevine | tendril climber | grid or wires | drops its leaves in autumn |
| Wisteria | twiner | very sturdy vertical supports | poisonous, very vigorous |
Wisteria: It is often recommended for pergolas, but it is demanding in two respects. First, it is poisonous. According to the Bonn Poison Information Centre (Giftzentrale Bonn), all parts of the plant are poisonous, especially seeds and pods. Symptoms are likely from as few as three seeds. The pods hang beneath the pergola after flowering, often within reach. With small children in the household, that is a good reason to choose another plant. Second, it grows very large: as a climbing shrub 6 to 12 m long. The Bavarian State Institute for Viticulture and Horticulture (LWG) warns that vigorous climbers such as wisteria develop very thick stems over the years and can damage supports that are too weak. A light DIY-store pergola is not built for that.
Grapevine: It loses its leaves in autumn. In summer it gives shade, in winter light comes through. On a pergola right in front of the house, that is an advantage.
How quickly it gets shady: It usually takes several years for a pergola to be fully covered, depending on plant and position. If you want shade straight away, stretch a shade sail or fabric panels over the slats in the meantime.
5. Where the pergola should stand
- Where you sit, at the time you sit there. Watch when each part of the garden gets sun. A pergola over a spot that is in shade in the evening anyway adds little.
- By the house or freestanding in the garden. By the house, the routes are short and the pergola extends the living space outdoors. If it is to be fixed to the façade, have it checked first whether and how the wall can carry it, especially with an insulated façade. Freestanding in the garden, it becomes a destination of its own, as in example 1.
- With an eye on the boundary. Whether a pergola must keep a distance from the boundary depends on the federal state (in Germany) and the individual case. Talk to your neighbours beforehand, because an overgrown pergola is visible from their side too.
- Without fire beneath it. The German insurer R+V explicitly advises that fire bowls or fire baskets should under no circumstances be placed under roofs such as pergolas or awnings. Place the fire bowl in the open, at a distance, for example on a gravel area of its own as in example 1.
6. Does a pergola need a permit?
In Germany, this is regulated by the building code of your federal state, and the rules differ from state to state. A uniform limit such as "permit-free up to 30 m² of floor area and 3 m in height", which you read in many guides, does not exist.
Example: Bavaria (Bavarian Building Code, version in force from 1 May 2026):
- Pergolas are exempt from the permit procedure. The law expressly lists them among "insignificant structures", without any size limit (Art. 57(1) no. 16(g) BayBO).
- Terrace roofs are exempt up to an area of 30 m² (Art. 57(1) no. 1(g) BayBO). The current version no longer names a depth limit. Earlier versions also limited the depth to 3 m. That is where the differing figures in many guides come from.
- Exempt does not mean unregulated. Even without a permit, the pergola must comply with all other rules (Art. 55(2) BayBO), for example a development plan.
Where the line runs: An open pergola with slats is a pergola. If it gets a solid roof of glass, polycarbonate or sheet metal, it is usually a terrace roof. With louvred roofs that can be closed, the classification can be disputed. In such cases, ask your local building authority before you buy. It takes little time and saves having to dismantle it.
Other federal states have other lists and limits. What else to consider with a terrace roof is covered in the article Modern garden with a terrace.
7. Construction: the essentials
- Foundations: Every post needs a foundation that reaches frost-free depth. How deep that is depends on region and soil. For kits, the manufacturer specifies foundation and anchoring.
- Wind: A shade sail, fabric panels or a louvred roof catch wind and pull on the structure. Plan them in from the start, not as an afterthought.
- Height: You should be able to stand comfortably under the pergola even when plants hang down from above. Hang a string at the planned height as a test before you order.
- Lighting: Lights on the pergola need power. The connection belongs in the hands of a qualified electrician. More in the article Garden lighting.
Try it out before you build
A pergola by the house or freestanding in the garden, timber or metal: how it looks at your place is hard to picture on paper. With GardenPilot you upload a photo of your garden, choose a theme world and add what matters to you, for example "freestanding timber pergola with a climbing rose over a lounge at the end of the garden". The first image is free. For a comparison, have a second variant shown, say with the pergola right by the house (1 credit). The images are visualisations, not construction plans. Sort out dimensions, structure and permits on site. How it works in detail is explained in the article AI garden design with a photo.
What would a pergola look like in your garden? Upload a photo – the first image is free. Start free with your photo
Frequently asked questions
Does a pergola need planning permission?
In Germany, that is regulated by the building code of your federal state. In Bavaria, pergolas are expressly exempt from the permit procedure, as are terrace roofs up to 30 m². If the pergola gets a solid roof, it usually becomes a terrace roof. Exempt structures must also comply with the development plan and all other rules. If in doubt, ask your building authority.
Does a pergola protect from rain?
An open pergola does not. Only a solid roof or a closed louvred roof keeps out rain. That often changes the legal classification too.
Which climbing plant suits a pergola?
That depends on the structure. Climbing roses are tied to horizontal supports; clematis and grapevines climb on grids or wires. Wisteria needs a very sturdy structure and is poisonous, especially the seeds and pods. With small children, another plant is the better choice.
Can a fire bowl go under the pergola?
The insurer R+V, for example, explicitly advises against it. Timber, climbing plants and fabric can catch fire from flying sparks and heat. Place the fire bowl in the open, at a distance.
Further reading
What would this look like in your garden?
Upload a photo of your garden and see design ideas on your own space. The first image is free.
Start free with your photoMore articles from Garden Elements
Rainwater in the Garden: 5 Ideas for Collecting, Using and Soaking It Away
Rainwater doesn't have to go down the drain: five ideas for collecting it in the garden, using it for watering and letting it soak away, with plants, costs and rules.
Garden Lighting: How to Light Paths, Steps, Seating Areas and Water
Light for paths, steps, seating areas and water explained with examples: what each kind of light does, what to plan before you pave, what you may connect yourself and which light is kinder to insects and neighbours.
Corten Steel in the Garden: Uses, Patina, Rust Run-off and Care
Bed edging, raised bed, water basin or fire pit: where Corten steel fits, how long the protective layer takes, how to protect light paving from rust run-off and why insides and salt are tricky.