Your First Deck Build: A Beginner's Checklist

You Can Build a Deck

A ground-level or low-profile deck is within reach of any reasonably handy homeowner with basic tools and a willingness to learn. First-time builders complete beautiful decks every summer. The key isn't advanced carpentry skill — it's thorough planning and working methodically. Use this checklist to stay organized.

Phase 1: Planning and Permits

• Check local codes: Chicago and most suburbs require a building permit for many deck projects, and permit thresholds vary by municipality. Check with your local building department (in the city, the Chicago Department of Buildings) before you buy a single board.
• Determine size and layout: Sketch your deck on paper or use free deck design software (most major lumber manufacturers offer these). Consider furniture placement — a 12x12-foot deck feels spacious empty but gets tight with a table and six chairs.
• Check for underground utilities: Contact JULIE, Illinois' utility-locating service, before digging any post holes, allowing the advance notice JULIE requires. This free service marks buried gas, electric, water, and communication lines. Hitting a gas line is dangerous. Hitting a fiber optic cable is expensive.
• Understand your soil: Chicago's heavy clay soil affects footing depth and drainage. Footings need to extend below the local frost line; check the required depth with your local building department. Shallow footings will heave and shift.

Phase 2: Materials and Tools

• Structural lumber: Pressure-treated southern yellow pine for posts, beams, joists, and rim boards. This is non-negotiable for anything structural that's outdoors.
• Decking: Choose your surface material — pressure-treated 5/4x6 is the budget option, cedar looks beautiful, composite is low-maintenance. The structural frame is the same regardless of surface choice.
• Hardware: Post bases, joist hangers, beam-to-post connectors, and angle brackets. Use hardware rated for ACQ-treated lumber (look for the "G185" galvanizing designation or stainless steel).
• Fasteners: Coated deck screws rated for treated lumber. Buy more than you think you need — running out of screws on a Sunday afternoon is frustrating.
• Tools: Circular saw, drill/driver, impact driver, speed square, 4-foot level, tape measure, chalk line, post hole digger or power auger, string line, and a water level or laser level.

Phase 3: Building Sequence

Step 1: Ledger board (if attached to house). The ledger connects the deck to your house and needs a solid connection to the house framing, with proper flashing above to prevent water intrusion. Check the required fasteners and details with your local building department. This connection is the most common point of deck failure when done incorrectly.

Step 2: Footings and posts. Dig holes to frost depth, pour concrete footings (Sonotube forms work well), and set post bases. Cut posts to the correct height using a level reference from the ledger. Accuracy here determines whether your deck is level.

Step 3: Beams. Install beams on top of posts using post-to-beam connectors. Built-up beams from doubled or tripled 2x lumber are common for residential decks and easier to handle than solid timbers.

Step 4: Joists. Hang joists from the ledger using joist hangers and rest them on the beam. Typical spacing is 16 inches on center for 5/4 decking or 12 inches on center for composite (which needs more support). Install blocking between joists for lateral stability.

Step 5: Decking. Start the first board at the house wall and work outward. Leave 1/8-inch gaps between boards for drainage and expansion. Pre-drill near board ends. Let boards run long and snap a chalk line to trim them all at once for a perfectly straight edge.

Step 6: Stairs and railings. Guard height, baluster spacing, and stair dimensions are set by code; confirm current requirements with your local building department. Stairs need proper stringers and consistent steps. This is where many DIYers slow down — stair layout takes patience but rewards precision.

Phase 4: Finishing

Let new pressure-treated lumber dry for four to eight weeks before applying stain or sealer. It needs to release its treatment moisture before finish will absorb properly. Then apply a quality penetrating stain and enjoy your new outdoor living space.

Ready to buy? Request a quote with your deck plans and material list, and we'll pass it to partner suppliers in our network. Many suppliers will review quantities and flag the hardware and fasteners that are easy to overlook.