Composite often changes fastening, spacing, joist, heat, expansion, and detailing requirements; wood varies by species, grade, treatment, moisture, finish, and maintenance plan.
01 / Formula
How this is calculated
Ownership cost = installed project cost + planned maintenance + likely repairs − residual value02 / Assumptions
What the estimate assumes
- ✓Both options use the same usable deck area and design loads.
- ✓Maintenance frequency and labor value are stated.
- ✓Warranty terms and exclusions are compared, not merely warranty length.
03 / Worked example
See the math in context
A higher initial-cost system may narrow the difference if it avoids several planned refinishing cycles—but only using realistic local prices and your intended ownership period.
04 / Guidance
Compare the substructure too
Decking choice can affect joist spacing, blocking, ventilation, breaker boards, fasteners, fascia, stair details, and labor. Price the complete compatible assembly.
05 / Guidance
Record non-price factors
Appearance, temperature underfoot, slip resistance, splinters, staining, fading, repairability, recycled content, local availability, and warranty service can change the decision.
Questions
Frequently asked
Are the calculator defaults building-code requirements?+
No. They are editable planning inputs. Verify current local code, approved plans, span tables, product evaluation reports, and manufacturer instructions before construction.
Does the estimate include the complete deck structure?+
Only if every component is explicitly listed. Footings, posts, beams, ledgers, flashing, lateral connections, guards, stairs, hardware, fascia, permits, delivery, and waste often require separate takeoffs.
How should I measure a non-rectangular deck?+
Divide the surface into rectangles and other measurable shapes, calculate each separately, then account for board direction, seams, breaker boards, borders, stairs, and reusable offcuts.
Sources