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Last update on November 06, 2025

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Arborists questions, answered by experts

A concrete base—or concrete footings, more specifically—is necessary for a freestanding pergola build. A pergola is top-heavy and can’t stand on its own, so it will always need some type of base or support. If you’re attaching a pergola to a deck, the deck’s supportive joists will act as the support, so there will be no concrete base or footings necessary.

Pergolas have no base structure to hold them up, so it’s necessary to attach them to some type of foundation. Most pergolas require a minimum of at least four concrete footings to keep them solid and stable in the ground. Attaching the pergola to a concrete foundation is an option as well.

If you have a knack for DIYing, a trellis can be built from scratch from all kinds of materials. However, if time is of the essence, it’s far easier to buy a trellis ready-made and put it together at home.

On average, a prefabricated pergola kit takes one to four hours to build. Prefabricated pergolas are the fastest to install and could save you money, while custom pergolas can take several days to install, ranging from eight to 16 hours. The number of workers on the project can also impact how long it takes to install a pergola. 

If you need to build a concrete slab, level your property, or remove obstacles from your yard before building a pergola, then your project could take several weeks to complete.

The cost of a pergola varies depending on the style you choose. The average price is between $2,100 and $6,400 for materials and installation. On the low end, a standard pergola will cost between $20 and $55 per square foot, while a retractable pergola will cost between $900 and $3,000 to build. If you plan to build the pergola over a pre-existing deck or patio, that will increase the cost.

The Lisbon, la homeowners’ guide to arboricultural services

From average costs to expert advice, get all the answers you need to get your job done.

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