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Yes, most general contractors require a down payment for project completion. A reasonable down payment for a contractor is 10% to 25% of the total project cost, though that will vary based on project size and location. The down payment helps cover the upfront costs of materials and permits and helps ensure payment for the project at hand. 

A pergola needs to be anchored, and typically, concrete is the best anchor option. Pergolas should be anchored to a concrete slab or concrete footings, and this is commonly required by municipal building codes. When applying for a permit to install a pergola, be sure to check the anchoring requirements as well.

Typical pergola kits include four support columns, several rafters, top runners, support beams, and a base for bolting the structure to a concrete surface. The types of pergolas vary by manufacturer and feature. Some have only two support columns, with the rest of the structure leaning against a carport or patio. Others have retractable shade canopies to keep cool in the summer. 

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.