A pergola instantly upgrades a patio or garden, creating shade, structure and a place for climbing plants or string lights. It looks impressive but is built from straightforward parts, making it a rewarding intermediate project. Here is how to build a pergola that stands strong for decades.
Plan size, height and placement
Pergolas work best when they relate to the space they sit in. A common freestanding size is 10×10 to 12×12, with posts 8 feet or taller so people pass under the beams comfortably. Decide whether it will be freestanding or attached to your house, and check for underground utilities before you dig post holes.
Choose your lumber
Use pressure-treated, cedar or redwood posts and beams so the structure resists rot and insects. Heavier timber (6×6 posts, 2×8 or 2×10 beams) looks substantial and carries the load with ease.
Tools and materials
Tools: post-hole digger or auger, circular saw, drill/driver, level, string line, clamps and a ladder. Materials: posts, beams and rafters, concrete for footings, structural screws or carriage bolts, metal post bases or brackets, and an exterior finish.
Step-by-step build
1. Set the posts
Dig footings below your frost line, set the posts plumb, and anchor them in concrete or on metal post bases. Brace each post and let the concrete cure fully – this foundation is what keeps the pergola standing straight.
2. Add the support beams
Cut the posts to a consistent height using a level and string line, then bolt the main support beams across the tops. Decorative end cuts on the beams add a finished look.
3. Lay the rafters
Space the rafters evenly across the beams and fasten them down. More rafters, and optional cross purlins on top, give more shade.
4. Finish and dress it up
Seal or stain the timber. Then make it yours – add climbing plants, a shade sail, string lights or a retractable canopy.
Build tips
- Take your time getting the posts plumb and evenly spaced; everything above depends on it.
- Use structural (not drywall) screws or bolts at every load-bearing connection.
- Pre-seal cut ends before assembly to protect the most vulnerable end-grain.
Ready-to-build pergola plans
Get a complete PDF plan with cut lists, materials lists and 3D assembly diagrams:
Browse our Pergola Plans collection to start building.