How a deck build actually goes
A deck build starts below the ground. The crew lays out the deck and digs the footing holes. Each hole must reach below your local frost line. Concrete piers go in the holes and cure. This foundation carries the whole structure, so it comes first.
Framing follows the footings. Posts stand on the piers, beams span the posts, and joists run across the beams. Most framing uses pressure-treated lumber because it resists rot and ground contact. On an attached deck, a ledger board ties the frame to the house. The crew checks that everything sits level and square.
Decking boards go down on top of the frame. Then the crew builds the railing, the stairs, and any built-ins. A permit inspection usually happens at the framing stage and again at the end. A simple ground-level deck can take several days. A large raised deck with stairs and railing takes longer.
What really moves your price
Material is the biggest lever. Pressure-treated wood costs the least and needs the most upkeep. Cedar and redwood sit in the middle and look natural. Composite and PVC cost more but resist rot and fading. The calculator above lets you compare these choices side by side.
Square footage drives the rest of the job. Price is figured per square foot times the material. A larger deck needs more footings, framing, and boards. Height matters just as much. A raised deck needs taller posts, more framing, and extra bracing, which adds both labor and material.
Railing and stairs add real cost because they take time and detail. Each stair tread and railing section is built by hand. Footings add cost when the soil is poor or the frost line is deep. Built-ins like benches, planters, and a pergola raise the total further. Use the cost guide to see how each choice shifts your estimate.
Permits, code, and structural safety
Most decks need a permit and at least one inspection. The permit protects you, because a deck holds people well above the ground. An inspector checks the footings, the framing, and the connections. Skipping the permit can cause trouble when you sell the home.
Footings must reach below the frost line. Ground that freezes will heave a shallow footing and push the deck out of level. The ledger board is the most critical connection on an attached deck. It must bolt into the house framing, with flashing to keep water out. A poorly attached ledger is a leading cause of deck collapse.
Code sets the guardrail rules by height. Once a deck sits above a set height, guardrails become required. The code also fixes a minimum guardrail height and a maximum gap between balusters. Stairs need a proper rise, run, and often a graspable handrail. A good builder knows the local code and builds to it.
How to hire and vet the builder
Start with license and insurance. A licensed builder carries liability coverage and knows the permit process. Ask for proof of both before any work begins. A builder who pulls the permit stands behind the structural work.
Insist on an itemized bid. It should list footings, framing material, decking, railing, stairs, and the permit as separate lines. A clear bid lets you compare builders on the same terms. Ask what framing material they use and how deep they set the footings. These answers reveal whether they build for the long term.
Check references and past decks. Ask to see a raised deck they built a few years ago. Look at how the railing, stairs, and boards have held up. Talk to past clients about the schedule and the cleanup. A builder with proof of good work is worth the wait.
Red flags and ways to avoid overpaying
The biggest risk is hidden from view. A builder can cut cost by skimping on framing or footings. Undersized joists and too few footings leave a deck that sags or bounces. You cannot see this once the decking covers the frame. Ask about joist size and footing count up front.
Watch the ledger and the permit closely. An improper ledger attachment is dangerous and hard to spot later. A builder who wants to skip the permit is a warning sign. Be wary of anyone who puts costly composite boards on a weak or undersized frame. The frame must be strong enough to carry the surface for decades.
A vague bid is a red flag by itself. A single lump-sum price hides what you are paying for. Get every line spelled out and compare it against the cost guide. The lowest bid often skips the parts you cannot see. Spend on the frame and footings first, because those keep the deck safe.