A pergola kit for a covered patio should be chosen around the patio you already have, not only around a size shown in a product menu. The useful question is whether the frame, posts, roof height and water path can fit the existing slab or deck without crowding the door, blocking a window or forcing the furniture into an awkward position.
This guide is a site-fit check for homeowners who want to cover an existing patio with an aluminium louvred pergola. It shows what to measure, where standard kits usually work, when wall-mounted or freestanding layouts make sense, and when custom sizing is the safer direction.
Quick answer
A standard pergola kit is usually a good fit when the patio has a clear rectangular footprint, stable post landing points, enough height below eaves and gutters, and a sensible route for roof water. Custom sizing deserves attention when one fixed obstacle controls the layout, such as an off-centre door, narrow side passage, drain, step, low gutter or irregular paving edge.
Pergola kit for a covered patio: start with the fit check
Most patios can be assessed with a straightforward fit audit. Start with the usable floor, then work upward. The paving may be wide enough, but the final layout can still fail if a post lands on a step, the beam sits too close to a gutter or the roof covers the table while leaving the chair pull-out area exposed.
Treat the pergola as an outdoor room with four connected zones: the roof footprint, post landing points, entry route and furniture zone. All four need to work at the same time. A kit that only passes the roof-size test has not been fully checked.
Standard kit is promising
The patio is rectangular, the corners are clear, the intended posts sit on sound landing areas and the door-to-garden route remains open.
Layout needs more checking
A gutter, downpipe, hinged door, low window, drain grate or furniture edge sits close to the proposed frame line.
Custom sizing may be better
Moving one post or shortening one dimension would noticeably improve access, alignment, drainage or furniture coverage.
Do not use the outside edge of the slab as the automatic roof size. The slab may include an unused strip beside a wall, a narrow edge near the lawn or a corner that belongs to drainage rather than daily living. The better footprint is the area that people can comfortably use once doors, chairs and pathways are active.
Measure the clear installation footprint
Record the patio width and depth in at least three places rather than assuming both sides are parallel. Older paving, garden borders and house walls can drift slightly. The smallest measurement is often the one that controls whether a standard frame fits cleanly.
Mark anything that cannot move: door tracks, steps, drains, downpipes, taps, pool fencing, garden beds, outdoor kitchens and service access. These fixed points matter more than loose furniture because the furniture can be adjusted later; the drain and doorway cannot.
The five measurements worth sending
Run a five-minute tape test
Use masking tape, chalk or small objects to mark the proposed corners. Place the main table or lounge where it will actually live. Open the door, pull out the largest chair, carry an imaginary tray to the barbecue and walk toward the garden or pool gate.
A body movement often reveals what a plan misses. If someone has to turn sideways beside a marked post, step off the paving to pass a chair or walk under the lowest part of a gutter, the layout needs adjustment before the product choice is final.
Choose freestanding or wall-mounted around the house
A freestanding pergola uses its own posts and can be positioned with less dependence on the house wall. It can be a practical direction when the fascia is unsuitable, the gutter line is crowded or a small gap from the home would simplify drainage and structural planning.
A wall-mounted layout can keep the house-side edge visually cleaner and may preserve more floor space, but it needs closer review of wall structure, fascia, eaves, gutters, windows and the roof-water route. The neatest-looking option is not automatically the simplest installation.
Freestanding often suits
- Open slabs and garden-side patios
- Homes with difficult gutters or fascia lines
- Layouts where a small separation from the wall is useful
- Projects that benefit from independent positioning
Wall-mounted often suits
- Patios directly outside a kitchen or living room
- Narrow spaces where house-side posts would crowd access
- Façades with a clear, suitable connection zone
- Layouts that need a strong indoor-outdoor visual link
For a fuller comparison, the guide on freestanding versus attached pergolas explains the layout decision in more detail. For this article, the key point is simple: choose the configuration that gives the patio the clearest access and the house the least complicated connection.
Place the posts before choosing the largest roof
Post positions control how the patio feels every day. On a dining patio, the critical zones are usually the chair pull-back area and the route from the kitchen. On a lounge patio, the problem may be a post cutting across the garden view or narrowing the path to a side gate.
Check each proposed post from three viewpoints: standing on the patio, looking out from the main indoor room and approaching from the garden. A post can be harmless from one angle and intrusive from another.
Reject a post location when it creates daily friction
- It narrows the main route between the house and furniture.
- It sits where a chair, barbecue lid or storage door needs to move.
- It lands close to a drain, step, paving edge or service point.
- It blocks the most important view from inside the home.
- It leaves an uncomfortable narrow strip between the frame and boundary.
This is where “bigger” can become worse. An extra metre of roof is not useful when it pushes a post into the only comfortable walking line. Cover the living zone first; treat unused paving as secondary.
Check doors, windows, eaves and the water path
Measure vertical clearance at the house, not only in the open centre of the patio. The important points are the underside of the eave, gutter line, fascia, wall lights, opening windows and any door that swings outward. Photograph every nearby opening fully open so the relationship is clear.
Sliding doors do not need a swing arc, but they still need a comfortable landing zone. A person should be able to step outside, pause and turn without meeting a post, chair back or lowered side screen. Hinged doors need the complete swing area kept clear.
Roof drainage and ground drainage are separate checks
A louvred roof can direct water through its designed drainage route, but it does not correct paving that already falls toward the house or holds water in a low corner. Watch the patio after real rain. Note where water sits, which path stays wet and whether a proposed post would interfere with an existing drain or flow line.
Planning and approval requirements vary by state, council and property. NSW guidance, for example, says roof water from applicable roofed structures should be disposed of into an existing stormwater drainage system and should not interfere with existing drainage fixtures or flow paths. Check the current rules that apply to the property and seek professional advice where needed. Read the NSW planning fact sheet.
The dedicated guide to louvred pergola drainage goes deeper into roof channels, post drainage and patio water flow. Here, the decision is whether the existing patio gives water a clear route that remains compatible with the proposed frame.
P120 or P180 for a covered patio?
The model choice should follow the footprint and use. Everpergo’s current P120 page lists 3 × 3 m and 3 × 4 m sizes with manual louvres in freestanding or wall-mounted configurations. The P180 page lists a wider standard range from 3 × 3 m to 3 × 10 m, with manual or motorised configurations and freestanding or wall-mounted choices.
Those options make P120 the simpler starting point for compact patios, while P180 is the more flexible comparison for wider dining, lounge and entertaining zones. Neither should be selected from floor area alone; the post locations and house-side clearance still decide whether the standard size is genuinely suitable.
| Model | Current standard direction | Best starting point when |
|---|---|---|
| P120 | 3 × 3 m or 3 × 4 m; manual louvres; freestanding or wall-mounted. | The patio is compact, the layout is straightforward and a simpler manual system suits daily use. |
| P180 | 3 × 3 m through 3 × 10 m; manual or motorised options; freestanding or wall-mounted. | The covered zone is wider, the patio supports dining or entertaining, or more size and control choices are useful. |
| Custom | Width, depth or height reviewed around the actual site rather than a fixed standard footprint. | A small dimensional change would solve a door, gutter, post, drain, boundary or furniture conflict. |
Choose custom size for a fixed constraint, not as a vague upgrade
Custom sizing is most valuable when it solves a specific problem. A shorter depth may protect a window line. A different width may keep a post away from a drain. A height adjustment may improve alignment below the eave. The purpose is not simply to make the pergola larger; it is to remove one site conflict without creating another.
When the standard footprint leaves the patio looking forced, use the Customize Your Pergola page as the next comparison point. Send the actual constraints rather than only a preferred size.
Prepare a useful size request
A good enquiry makes it possible to judge fit before the patio is reduced to one width-and-depth number. Include the layout information that controls the decision, especially the openings, fixed obstacles and post landing zones.
Send these details before choosing the final kit
- Patio width, depth and available height in millimetres.
- A photo taken from the house looking outward.
- A photo taken from the garden looking back at the house.
- Photos of nearby doors and windows fully open.
- Locations of drains, downpipes, steps, taps and boundaries.
- The intended dining, lounge or barbecue furniture layout.
- Whether freestanding, wall-mounted or custom sizing is being considered.
For a compact, clear patio footprint, review P120 first. For a wider outdoor room or a project that benefits from more size and control options, compare P180. When one fixed obstacle dictates the whole layout, review custom sizing before committing to a standard frame.
The right pergola kit for a covered patio should make the area easier to use: the door opens cleanly, people move around the furniture without squeezing past posts, water has a planned route and the new roof feels connected to the home rather than imposed on it.
Pergola kit for covered patio FAQ
Can a pergola kit be installed over an existing patio?
Yes, many existing patios can suit a pergola kit when the usable footprint, post landing areas, height, access and drainage are compatible with the chosen layout. The slab or deck should also be assessed for the proposed installation by an appropriately qualified professional.
Should the pergola match the full size of the patio slab?
Not always. The useful roof footprint should cover the active living zone while keeping posts, doors, drains and pathways clear. An unused strip of paving does not need to be covered when doing so makes the layout less comfortable.
Is a freestanding pergola easier for an existing patio?
It can be easier when the house wall, fascia or gutter line creates complications. A wall-mounted configuration may preserve floor space and look more integrated, but the connection point and water management need closer review.
How do I know whether P120 or P180 is more suitable?
P120 is the simpler starting point for compact 3 × 3 m or 3 × 4 m patio layouts that suit manual louvres. P180 offers a broader standard size range and manual or motorised choices, making it more relevant for wider dining, lounge or entertaining areas.
When is custom sizing better than a standard pergola kit?
Custom sizing is worth reviewing when a small change in width, depth or height would avoid a fixed conflict such as a door, gutter, drain, step, narrow boundary gap or badly placed standard post.
What photos should I take before asking for size advice?
Take one photo from the house, one from the garden, one from each side and close photos of doors, windows, gutters, drains and steps. Include a rough sketch showing the measurements and intended furniture position.
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