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Although dependent on the type and size of lumber, most 2-by-4-by-8-foot pieces of lumber cost anywhere from $3 to $6. Softwood lumber like pine falls on the lower end of the spectrum, while hardwood lumber like oak or walnut falls on the higher end. Different retailers and lumber yards can also vary in price, so it helps to shop around to compare prices.

Though this is a project that can be DIY-ed—there are kits available for $600 to $7,500—hiring a pergola pro will ensure the final product is structurally sound. A savvy homeowner may already have all the necessary tools and know-how to build a DIY pergola, but the difference in cost isn’t that much, and having help will make the process easier in general.

Turnbuckle weight loads vary depending on their size. Smaller 1/4-inch turnbuckles have a weight capacity of about 500 pounds. A 3/8-inch diameter turnbuckle, which is strong enough to handle most residential fence gates, can handle a working load of 1,200 pounds. Larger 1/2-inch diameter models have a limit of 4,000 pounds.

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.