
A fast, defensible rehab number before you make an offer: per-square-foot base plus kitchen, baths, roof and contingency.

The ZIP includes the tool, instructions, license and example project.Total rehab budget
| Per-sq-ft work | $36,000 |
| Kitchen + baths + roof | $27,000 |
| Subtotal | $63,000 |
| + Contingency | +$9,450 |
| Total rehab | $72,450 |
A quick rehab estimate combines a cost-per-square-foot figure for general work (paint, flooring, drywall, minor systems) with separate line items for the expensive stuff — kitchens, bathrooms, roof and structural — that don't scale with square footage. Light cosmetic work runs roughly $15/sq ft, a medium rehab around $30, and a heavy gut $50 and up, varying by market and labor. Always add a contingency (10–20%): rehabs reveal surprises once walls open. Treat the result as a planning number, then lock it down with real contractor bids before you bid at auction.
Estimate the annual CRIM contribución from the assessed (1957) value, exemption and your municipality's rate — before you buy, bid or sign.
The most you can bid and still hit your minimum profit. Write it down before the auction — never bid a dollar past it.
Net profit and ROI from purchase, rehab, holding, closing, ARV and selling costs — the costs beginners forget, included.
How much cash you pull back out at the refinance, and whether the property still cash-flows after.