Tools & working records

Use your own inputs. Inspect assumptions. Export the result.

Working toolOwnership scenario planner

Compare two user-defined plans with a complete year-by-year ledger.

Hypothetical ten-year costs: 12000 dollars now, 300 dollars each year and 1800 dollars in year six; cash total 16800 and present value 16066.53 at 3 percent real rate. — Hypothetical amounts, not market prices or maintenance requirements. Future costs occur at year-end. Open full-size diagram · Download SVG

Ownership horizon diagram includes costs through the final year and excludes later events without predicting material life. — A study horizon is a chosen comparison window, not a promised service life. Open full-size diagram · Download SVG

Understand the method

01 / PlanningStart with the ownership question

Define what your deck ownership scenario includes before comparing totals.

02 / PlanningBuild a cost inventory you can trace

Turn quotes, receipts, and allowances into consistent ownership inputs.

03 / Care assumptionsBuilding a deck maintenance cost schedule

Keep recurring allowances and irregular work distinct without inventing a universal schedule.

Choose the ownership question before changing assumptions

The lifecycle tools compare the consequences of your assumptions over a chosen study period. They do not predict an individual deck's service life. Keep material choice, appearance preference, care schedule and replacement assumptions visible so a comparison can be understood and repeated.

Include the entire replacement event

A replacement assumption should account for teardown, disposal, new material and rebuilding labor within the model's stated scope. Record separately whether the supporting structure is retained or included. Changing only the board purchase price can understate the event you intend to compare.

Read cash, present value and labor separately

Cash total follows the modeled payments. Present value applies the chosen discounting assumption. Labor hours describe time and should not be confused with a cash price unless the model explicitly values them. Compare scenarios using the same study horizon and scope.

Example: natural weathering versus maintained color

Compare two Ipe ownership scenarios with the same deck and replacement assumptions, changing only the appearance-care schedule. The difference then reflects that care choice. It does not establish an observed aging timeline or a guaranteed service life of up to 75 years.