Knowledge base
Can I fix a pergola to an existing patio?
How to decide whether the patio is a suitable structural base rather than just a neat surface.
You can fix some pergolas to an existing patio when the construction beneath each footplate meets that model's requirements. The appearance of the paving alone cannot confirm that it is a suitable structural base.
Harbour Lifestyle says its supplied expansion anchors work on solid concrete or well-laid paving for the models covered by its guide. The same guide advises considering concrete pads where slabs sit on sand or the bond below has weakened. That is manufacturer guidance for those products, not a universal specification.
Find out the patio build-up before drilling. Record the paving material, slab thickness, bedding and the presence and thickness of any concrete base. Locate drains, cables and pipes. If the patio is old, hollow-sounding, cracked or has moved, ask the pergola supplier or installer what investigation it needs.
Porcelain and stone need appropriate drilling methods to avoid damaging the finish. More importantly, the anchor must fix into the specified structural material rather than relying on a brittle tile. Do not choose an anchor merely because it fits through the footplate hole.
Check level and drainage as well as strength. The finished footplates must sit as the manual shows, while the patio still needs to shed water. Some manufacturer systems use approved packers to fine-tune level or fall; do not improvise a stack that reduces anchor engagement.
Get the base accepted in writing before delivery if installation is part of the purchase. That avoids discovering on assembly day that concrete pads are required.
Sources
- Harbour Lifestyle: pergola ground preparation — accessed 14 November 2026.
- Harbour Lifestyle: assembly and installation guides — accessed 14 November 2026.
Use fixing a pergola to an existing patio, pergola bases and fixings and the anchor bolt glossary entry.