Rebuilt so each phase pulls from its own quantity source instead of stepping on its own boots.
This version separates footprint, living area, wall area, roof area, finish surface area, lineal footage, counts, and optional add-ons. It also calculates footing concrete from lineal footage using a standard 15" × 16" footing basis, and includes editable soft-cost allowances for a ballpark starting budget.
Phase selection
Select the work you want priced first, then enter only the measurements that apply to those scopes. Each toggle only uses the matching quantity source shown in the rate table below.
Project quantities
Enter each quantity once in the proper category. The calculator uses those values only for the matching scopes.
Core building sizes
These are the big parent measurements. They should not all be identical unless the project really is that conveniently rectangular.
Foundation and shell quantities
These are the shell-specific numbers that keep the lower structure from being charged like interior finish work.
Interior finish quantities
Drywall and paint should use finish surfaces, not just floor area pretending to be walls.
Systems, demo, and counts
Mechanicals and cabinet/appliance items should use lineal footage and counts, not fuzzy square-foot voodoo unless you choose to.
Average soft-cost allowances
These are editable ballpark starting figures for early planning. They are not hard bids and they absolutely will drift once counties, utilities, engineers, and real-world chaos enter the chat.
Rate structure
The table below shows the exact quantity basis used for each phase, so you can see where every number comes from and avoid overlap.
| Phase | Unit | Quantity basis | Default rate | Notes |
|---|