About Ballpark Lab
A ballpark is a starting budget, not a binding quote. Our goal is to help you compare project options, understand the assumptions behind a number and ask better questions before hiring an installer.
Why we built it
You should be able to explore a home-project budget without first sending your phone number to a salesperson. Our free calculators let you change the inputs and compare scenarios before deciding whether to request professional quotes.
How to use the estimates
Start with the same size, material and scope for each comparison. Review what is included and excluded, then replace uncertain assumptions with measurements and written contractor quotes. A low/high band is a modeled range, not a statistical promise that a future bid will fall inside it.
Published energy and product datasets are distinct from our construction-price bands and regional assumptions. The source inventory explains the difference and identifies missing price provenance. We do not describe an undocumented model input as a verified local survey.
Dates and corrections
Dataset dates identify stored snapshots. Editorial updates can improve explanations without refreshing the underlying prices. A planned refresh cadence is not a guarantee that every value is current. Review the data dates and methodology and verify decisions against current local requirements and quotes.
Who maintains Ballpark Lab?
The project is maintained by the Ballpark Lab Research Team and published under organizational authorship. That does not imply an independent engineering review, contractor endorsement or professional certification. The relevant methods, source limitations and a contact route for corrections are available to readers.
The site covers solar, pools, fences, driveways, siding and HVAC. These tools do not replace a site inspection, compliant design, or tax, legal and financial advice. See the calculator directory to choose the relevant planning tool.