Deck cost calculator guide: what actually moves the price.
A deck is not priced by square footage alone. Height, footings, framing, stairs, railings, decking material, demo, site access, flashing, and code details can all move the final number.
Why deck quotes can be far apart
Framing and footings
Joist size, beam layout, post spacing, footing type, ledger attachment, and site access can change labor and material needs.
Railings and stairs
Railing linear footage, stair count, landings, guards, and handrails often add more cost than homeowners expect.
Decking details
Composite decking, hidden fasteners, fascia, border boards, and picture framing can improve appearance but add material and labor.
Use the calculator, then check the quote
- Enter deck length and width.
- Choose wood, cedar, composite, or premium composite.
- Set deck height, railing length, and stair count.
- Add demo if an old deck needs removal.
- Use the checklist to confirm the quote includes footings, railing, stairs, hardware, flashing, demo, disposal, and permits.
Common deck quote questions
- What framing size and spacing are assumed?
- How are footings sized and inspected?
- Is ledger flashing included?
- Are stairs and railings included or separate?
- Is demo and disposal included?
- What happens if rot is found behind the old ledger?