Measure the usable footprint
Note the clear width and depth, excluding doors, drains, low gutters and access routes.
Sizing guide
Pergola Size Calculator
A pergola should cover the activity beneath it without overpowering the garden. Start with the furniture footprint, then add comfortable movement space.
Find my best outdoor coverWhat to consider
Allow for movement
Add space for chairs to pull out and for people to walk behind them.
Check the outside dimensions
Supplier sizes may refer to the roof or posts. Confirm both before buying.
Quick sizing guide
| Use | Useful starting size | Check carefully |
|---|---|---|
| 2–4 seat lounge | 3 × 3m | Sofa depth and side access |
| 6-seat dining | 3 × 4m | Pulled-out chair clearance |
| Hot tub | Tub size + 0.8m each side | Cover lift and ventilation |
Common questions
Should a pergola be larger than the patio?
Usually no. Keeping posts and roof within a suitable hard-standing area makes access, drainage and anchoring easier.
Is 3 × 3m a good pergola size?
It is a useful compact size for a small lounge or four-seat table, but can feel tight around a six-seat dining set.
Related guides
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