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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.

Yes, it’s definitely possible to build a pergola on an existing deck. All you need to do is attach the pergola support beams to the deck’s joists and build up from there. Beware that mistakes can damage your deck, so if you’re at all unsure of the process, play it safe and hire a pro for your custom build.

Wooden pergolas can last five and 12 years as long as you maintain your pergola. Make sure to clean, stain, and seal wood pergolas every two to three years to protect the wood from insect damage, rot, and decay. 

Vinyl or aluminum pergolas can last a lifetime. The only problems you may encounter with these pergola materials are weather-related—heavy rain storms or snowfalls. Check the stability of your pergola every season. You may need to add new supports or replace broken beams on an as-needed basis.

You can install exposed solid wood beams for between $6 and $80 per linear foot, but these beams are often decorative if you’re retrofitting an existing home with them. Laminated veneer lumber beams, more commonly called LVL beams, cost $3 to $12 per linear foot, and while they can’t span nearly as long of a distance as steel I-beams, they can provide more open spaces than traditional wooden beams.