A deck bid has footings, framing, decking, railings and stairs, and every one has its own count. Trades HQ keeps it all on one estimate and shows whether the job made money.
Add beams, posts, footings, hardware and fasteners.
Add railings and stairs as their own lines.
Add permit and inspections, then apply your overhead and profit.
Example (illustrative): a 12 ft deep × 16 ft wide deck, joists 16 in apart, 5.5 in boards with a 1/8 in gap.
Step
Math
Result
Joists across 16 ft
(16 × 12 ÷ 16) + 1
13 joists
Board rows across 12 ft
144 ÷ 5.625
25.6, so 26 boards
Pricing tip: Price railings and stairs as their own lines; they're often the most labor per foot. And remember that markup and margin aren't the same number: a 20% margin needs a 25% markup. The Estimating Basics guide walks through the math, and the free markup and margin calculator does it for you.
See it in Trades HQ
A sample estimate in Trades HQ. Each line has its own material and labor cost, and the Bid Summary adds your overhead and profit. Sample numbers.
Questions deck builders ask
How many joists does a deck need?
Divide the width the joists are spread across, in inches, by the joist spacing, then add one. For example, a 16 ft width at 16 inches apart needs 13 joists. Follow your local code for spacing and spans.
Do decks need a permit?
Many places require a permit and inspections for decks. Check with your local building department and include the permit on your estimate.
Can I use Trades HQ on my phone?
Yes. Trades HQ runs in your phone’s web browser, and you can add it to your home screen like an app, so you can build an estimate or send an invoice from the truck.
Is there a free trial?
Yes. Every plan starts with a 14-day free trial, and you don’t need a credit card to start. Plans start at $75 a month, and you can cancel anytime.
Examples on this page use illustrative numbers only. Use your own costs, rates and local requirements. This page is general information, not legal, tax, or financial advice.