What to measure for a deck build

Homeowners think a deck is priced by the square foot of decking. It mostly isn't. The framing, the footings and the railing under and around those boards carry more of the cost than the boards do.

Height is the number that changes the job

A deck 18 inches off the ground and one 9 feet up have the same area and are not the same job. Height drives post length, footing depth, whether railing is required at all, how many stairs, and whether anyone can work underneath it. Take it before you take anything else.

Joist spacing comes from the decking, not from habit

Many composite boards require 16-inch centres, some require 12 on a diagonal. That choice changes joist count by a third on the same area. It is a material decision that silently rewrites the framing line, so record it as a measurement rather than assuming.

Stairs are their own project

Count risers, not just "some steps". Stringers, treads, railing both sides, a landing and often a footing — a short flight can be a meaningful share of a small deck. It is the single most commonly under-quoted part of the trade.

Permits and inspections are a real line

Most decks over a certain height need a permit, and a footing inspection means the hole is dug and then the crew waits. That is a scheduling fact and a cost, and it is better on the estimate than in a phone call three weeks later explaining a delay.

Record area, height, railing and stairs on the report, and a package turns them into joists, boards, fasteners, footings and labor.