How HouseWorkbench works
Every tool on this site follows the same workflow, from the measurements you bring to the plan you leave with. Understanding that workflow once makes every individual project tool faster to use.
1. Everything runs in your browser
There is no account, no server-side calculation, and no database behind this site. The page you load contains the calculation logic itself, and it runs on your device the moment you change an input. That is a deliberate architecture choice, not just a privacy feature: it means the site has no meaningful cost to run at any traffic volume, and it means your project details are never exposed to a breach, a subpoena, or a change in someone else's data-retention policy, because they were never transmitted in the first place.
2. Measurement to plan
A project tool starts by asking for the facts a tape measure, a product label, a plan, or a recent quote can normally supply in a couple of minutes: dimensions, openings to subtract, the products you are considering, and the prices you have found for them. The tool flags anything missing or out of range before it produces a result, so you find out you are missing a measurement before you are staring at a number you cannot trust, not after.
3. Transparent assumptions, not hidden ones
Once a tool has what it needs, it shows the calculation, not just the final number. That means the quantities that fed into a result, any waste allowance applied, and any planning assumption used are visible and, where it makes sense, editable. If a tool's method depends on a manufacturer's stated coverage or yield, that number comes from the product label you enter, not a hidden site-wide average.
4. Package rounding and leftover coverage
Materials are sold in fixed units, cartons, gallons, rolls, bags, stock lengths, not the exact decimal quantity a project needs. A tool converts a required quantity into whole purchase units and shows the leftover coverage that rounding creates, because that leftover often changes which of two options is actually cheaper once you buy in real packages instead of comparing raw unit prices.
5. Product-label verification stays with you
A tool can calculate from the numbers you give it, but it cannot verify a product's installation instructions, a manufacturer's spacing or clearance requirement, a local code or permit rule, or a site condition specific to your property. Where that verification matters to whether a plan is safe to act on, the tool names it explicitly as the next thing to check, rather than assuming it away.
What a plan cannot decide for you
A quantity or budget plan is not an installation guide, a structural calculation, or a permit determination. Product instructions, local building requirements, and your specific site conditions can all change what is actually safe or appropriate to build, and a qualified professional's review is sometimes the correct next step. This site tells you when that kind of verification applies to a project; it does not perform it.
6. Saved local plans
A project you start can be saved so its measurements and choices carry forward into a later visit or into a related decision, like moving from a material quantity plan into a budget or a comparison. Saved plans live only in your browser's local storage, are fully editable after the fact, and can be exported to a file, imported back in, or reset at any time from My plans.
Common questions
Does anything I enter leave my browser?
No. Every calculation runs in your browser using JavaScript that ships with the page. Nothing you type, including measurements, product choices, or prices, is sent to a server, because there is no server for it to go to. Analytics, where enabled, records anonymous page views only and never your inputs or results.
Why does a plan ask for a product-specific coverage number instead of assuming one?
Coverage, stock length, and package yield vary by manufacturer and by product line, and a generic average would make the resulting purchase plan wrong for your actual materials. Product-label numbers you enter are treated as authoritative for your project; the site never substitutes a generic default without telling you.
What happens if I lose or clear my saved plans?
Saved plans live only in your browser’s local storage on the device you used to create them. Clearing your browser data, switching devices, or using a private window will not carry them over. Exporting a plan to a file is the way to back it up or move it to another device.