The Cost of Waiting

This project

Project name

Building

My saved projects

Fill in what you know. Don't know an answer? Click Not sure next to that question and the calculator uses a typical engineering value, listed under Assumptions in use.

01The project

Replacement cost today

A contractor quote, recent bid, or consultant estimate.

If not this cycle, when?

Years until the next realistic funding window.

02The roof today

Roof type

Roof age

yrs

Expected service life

yrs

Filled in with a typical value for this roof type. If a roof condition assessment or your roofing consultant has given you an expected or remaining service life, enter that instead.

Manufacturer's warranty

Leaks in the last 12 months

leaks

Compared with the year before

Wet insulation (moisture or infrared survey)

03Cost of living with it

Roof repairs and patching, per year

Work orders, service calls, emergency labor.

Cost inside, per leak

Cleanup, ceiling tiles and finishes, damaged equipment, a room offline, an insurance deductible.

04What it protects

What the roof covers

Value under the roof (optional)

Interiors, equipment, research, recent renovations. Leave blank if unknown.

Building replacement value (optional)

Lets it show the roof's effect on your FCI. Leave blank if unknown.

Waiting 3 years costs

—

Every year

—

Every day

—

Triage priority P1

Rough order of magnitude.Planning-level figures built on simplified models and typical assumptions. Not a cost estimate, engineering assessment, or financial advice. Confirm with a condition assessment and contractor pricing.

ROI of acting now—

Pays for itself by—

Do nothing, 20 years—

What drives the priority

Likelihood comes from the roof's condition; impact comes from what it covers. Combined on a standard severity × likelihood triage matrix.

Three paths, twenty years

Cumulative spend, with inflation in every path. Patching slows the decline; doing nothing lets damage compound and makes the eventual replacement bigger.

Replace now Patch and wait Do nothing

1:58

0.07

CopelandBEC · Roof capital planning

One-page business case

Uses the project name and building above. Export it to Word to edit and attach to a capital request, or to PDF to send as is.

How ROI is calculated, in plain terms

ROI answers one question: compared with doing nothing, how much does replacing the roof now save for every dollar you spend? It looks at the years the current roof has left, plus the replacement you'd be forced into at the end of them, in three steps.

Add up what doing nothing would cost. For the years the roof has left (at least until the funding window), leak damage and patch costs grow 10% a year with no repairs. At the end of those years the roof has to be replaced anyway, and by then the job is bigger: 5% more scope for every year it was neglected, up to 30%. Everything is in today's dollars, since inflation raises costs on every path alike.
Subtract what replacing now costs beyond the price. Routine maintenance on the new roof over the same years, plus the value of any service life the current roof still had and that replacing it now throws away.
Divide the savings by the investment. ROI = (step 1 − step 2) ÷ today's replacement cost. It never shows below 0%.

For this project	Amount

Pays for itself by: the first year in which replacing now has cost less, in total, than doing nothing.

How the math works. Every path uses the same construction cost inflation (7% a year). Patch and wait: the repairs and leak costs you keep paying rise a further 5% a year as the roof ages, and the replacement grows 2% in scope per year of delay. Do nothing: with no repairs, damage and leak costs rise a further 10% a year, and the roof is replaced at the end of its service life (never before the funding window) with 5% more scope per year of neglect. Waiting cost = repair and leak costs during the delay + the extra cost of replacing later. ROI follows the Capital Project Playbook: cost avoided ÷ investment. Cost avoided, in today's dollars = what doing nothing would cost over the years the current roof has left (damage compounding 10% a year), plus the larger forced replacement at the end of them (up to 30% more scope), minus the new roof's upkeep over the same years and the value of any life the current roof still had. Pays for itself = the first year replacing now has cost less, in total, than doing nothing. FCI = deferred work ÷ building replacement value (above 0.10 is poor, above 0.30 critical). Triage priority combines a likelihood score (age vs. service life, leak count and trend, warranty, wet insulation) with impact (what the roof covers).

Typical assumptions when you choose Not sure. Replacement at ~$30/SF (low-slope tear-off and replacement, ±30%, before design and soft costs). Roof age at 70% of expected life. Warranty expired at 15+ years. Leaks not tracked: none counted (actual leaks can vary significantly, so results may understate the cost). Repairs at 0.5% of replacement cost a year, 1% in the last 20% of life. Interior cost per leak of $25K (labs, healthcare, data), $10K (tenant, retail or leased), $8K (classrooms, housing, offices), $5K (admin, common areas) or $1.5K (storage).

Limitations. This calculator gives rough order-of-magnitude figures for early planning and conversation. It relies on simplified models and industry-typical assumptions, not an inspection of your building, and it is not a cost estimate, an engineering assessment, or financial, legal, or accounting advice. Do not rely on it as the sole basis for funding, design, or contracting decisions. Actual costs, service life, and risk vary with site conditions, scope, and market pricing. Confirm with a professional condition assessment and contractor pricing. Provided as-is, without warranty.

Sources: 7% annual compounding, Oxmaint (2026) and CopelandBEC, "The Cost of Deferred Maintenance" (2025); FCI scale per APPA / NACUBO. Full endnotes in The Capital Project Playbook (March 2026).

How to use the calculator

Name the project. Add the project and building at the top. They carry into the business case.
Enter what you know. Cost, roof age and type, warranty, leaks, repair spend, and what the roof covers.
Click Not sure for anything you don't know. The calculator fills in a typical engineering value and lists it under Assumptions in use. Replace it when you get the real number.
Set the funding window. "If not this cycle, when?" is how many years until the work could realistically be funded.
Read the results. The top panel shows what waiting costs and a triage priority from P1 (fund this cycle) to P4 (maintain and monitor). Below that: ROI, payback, the cost of doing nothing, and three paths over 20 years.
Export the business case. Export to Word to edit it and attach it to a capital request, or to PDF to send it as is. Save as PDF at the top prints the full report.
Save your work. Save project keeps it in this browser on this computer; reopen it from My saved projects, or use + Start a new project for another roof. To share it or use another computer, choose Share or move, download a copy, then open that copy there.

Results are rough order of magnitude for early planning, not a cost estimate or engineering assessment. Clearing your browser data removes saved projects, so download a copy of anything you want to keep.

The cost of waiting.

What drives the priority

Assumptions in use

Three paths, twenty years

One-page business case

Tell us about your building.

How to use the calculator