Methodology
How to compare a repair estimate against actual contractor costs
How investors should compare estimated rehab budgets with actual invoices, contractor bids, and final project costs without treating every variance as a model error.
Direct answer
Estimate-vs-actual tracking should compare the original scope, the accepted bid, and the final invoice at the line-item level. A variance only teaches you something when you know whether the scope changed, the quantity changed, the finish level changed, or the original estimate missed the item.
Example: a kitchen variance that is not one problem
A pre-offer estimate budgets an investor-grade kitchen at $24,000. The final invoice lands at $31,500. That variance could be a pricing miss, but it could also come from added cabinet layout changes, appliance upgrades, electrical corrections found during demo, or a higher retail finish level than the original underwriting assumed.
The useful comparison splits the variance into base scope, change orders, hidden conditions, and finish upgrades. Only then can the next estimate improve.
The right comparison levels
A total project variance is useful for deal review, but it hides the cause. Line-item comparison shows whether roofing, HVAC, plumbing, or finish work created the gap.
- Original line item and estimate range
- Accepted contractor bid for the same scope
- Change orders and newly discovered work
- Final invoice or paid cost
What counts as learning signal
The best feedback records what changed. If the contractor replaced damaged subfloor after demo, that is hidden scope. If the investor chose quartz instead of laminate, that is finish-level drift. If the original report named the defect and the bid still exceeded the high range, that is stronger pricing feedback.
Limitations
- Actual costs reflect contractor availability and project timing, not just material and labor rates.
- A final invoice may include owner-directed upgrades that were not part of the original underwriting scope.
- Small samples can mislead. One high bid should not rewrite a whole pricing model.
How Scopebase handles it
Scopebase keeps estimate history and supports actual-cost review so investors can compare estimate ranges against contractor bids and paid costs.
The goal is calibration, not false precision: identify recurring misses, preserve the scope reason, and improve future deal screens without overfitting to one contractor.
FAQ
Should I compare actuals to the low, mid, or high estimate?
Compare against the full range first, then review whether the final cost landed below, inside, or above the range. The mid number alone is too narrow for rehab underwriting.
Are change orders estimate errors?
Sometimes. A change order is an estimate miss only when the original source material contained enough evidence to include it.
Why track bids separately from invoices?
Bids show market pricing for planned scope. Invoices show what the project became after decisions, access, and hidden conditions changed the work.