Replacement cost estimator
Quick and advanced modes with low, expected, and high planning ranges.
Beta, publishedUse it on the home page
Costs & calculators
A useful estimate names what it does not know.
Use transparent planning tools that show the formula, the data date, the uncertainty range, and the project details that can change the answer.
30-second answer
What actually determines roof replacement cost?
Square footage is only the starting point. Pitch, complexity, access, tear-off, deck condition, flashing, ventilation, permits, material tier, and local labor can move a proposal substantially.
Model transparency
What the beta estimator counts, and what it leaves out.
The estimator is a screening tool, and it is worth exactly what its inputs are worth. So both halves of the ledger are published, not just the flattering one.
In the model
- Horizontal footprint converted to roof surface with a pitch multiplier
- A complexity allowance you pick: simple gable, typical, or many valleys
- Broad national installed-cost ranges by material family
- A separate illustrative waste allowance, shown as order area rather than price
Not in the model
- Local labor rates and market conditions
- Access, staging, and mobilization
- Existing layers, tear-off, and disposal
- Deck repair and hidden conditions
- Permits, inspections, and taxes
- Flashing details, ventilation, insulation, and drainage
- Product tier within a material family
- Project minimums
Quick roof cost · v0.1 planning beta · Reviewed
Every line in the right-hand column is a real cost on a real project, which is why a legitimate proposal often lands outside the range. See the seed ranges and their sources.
Working today
One calculator is live. The rest of this section is not.
The tools in the roadmap below are unbuilt. These two pages are published, ungated, and blunt about what the current model cannot see.
Open the beta cost estimator
Four inputs, a visible formula, and a planning range you can take into a conversation with an installer.
Read what this site cannot determine
The judgments no calculator here can make: your deck, your jurisdiction, your structure, your insurance coverage.
Tool roadmap
Six calculators, one shared rule: show the formula.
Only the replacement-cost estimator exists today. Each tool below has to publish its inputs, assumptions, data date, and uncertainty range before it publishes a number.
Roof area & pitch
Convert horizontal plan area into measured roof surface and material order area.
Formula publishedSee the pitch multiplier table
Lifecycle cost
Compare upfront price, expected replacement timing, maintenance, and ownership horizon.
Not published yet
Quote normalizer
Compare bid scope, allowances, exclusions, warranty terms, and price on one worksheet.
Checklist publishedOpen the quote checklist
Repair or replace
Explore age, failure extent, deck condition, repairability, risk, and future plans.
Not published yet
Commercial capital plan
Model maintenance, recover versus tear-off, disruption, and lifecycle decisions.
Not published yet
Before you trust a number
See the assumptions before trusting the number.
The methodology page documents the pitch multipliers, the seed price ranges and where they came from, the complexity factors, the exclusions, and the plan for replacing broad ranges with local data.
Read the pricing methodology