Methodology — Limitations
What Scopebase estimates can and cannot do.
Scopebase is a pre-inspection repair-risk screening tool. Understanding its limitations is as important as understanding what it does well. This page documents the known gaps, assumptions, and cases that always require on-site professional verification.
What a Scopebase estimate IS
- A pre-inspection repair-risk brief for buy-or-walk deal screening
- A probabilistic cost range based on regional data, inspection findings, and AI analysis
- A confidence-scored scope that flags where information is missing or uncertain
- A starting point for on-site verification, not a substitute for it
What a Scopebase estimate IS NOT
- A licensed contractor bid or formal construction estimate
- A certified property inspection or engineering assessment
- A licensed real estate appraisal
- A guarantee of final renovation cost, timeline, or project outcome
- Legal, tax, financial, lending, or investment advice
- A permit opinion or code-compliance determination
Important: Scopebase is a repair-risk underwriting and planning tool. It is not a contractor bid, property inspection, appraisal, lending approval, legal advice, tax advice, or guarantee. Users should verify major costs with licensed professionals before committing funds to a deal.
Known Limitations
Hidden conditions
Estimates cannot account for conditions invisible in inspection reports or photos: structural issues behind walls, subslab plumbing, unknown foundation movement, mold inside wall cavities, buried environmental hazards, or deferred maintenance not yet visible.
Sparse input data
Estimates based on limited inspection findings, brief address-only input, or low-quality photos will have higher uncertainty ranges and more flagged unknowns. Confidence scores reflect input quality — low confidence means more field verification is required.
Regional pricing drift
Labor and material costs change with local market conditions, contractor availability, supply chain dynamics, inflation, and permit timelines. Regional cost data in Scopebase may lag actual market conditions by weeks to months.
Local code and permit requirements
Scopebase does not know your local building codes, permit requirements, HOA rules, inspection requirements, or contractor licensing rules. These can materially affect project cost and timeline.
Specialty scope items
Some items require a licensed specialist to assess: environmental remediation (asbestos, lead, mold), structural engineering, elevator or mechanical systems, historic preservation requirements, and utility capacity. Scopebase flags these but cannot estimate them accurately.
Contractor bid variance
Actual contractor bids for the same scope can vary 20-50% or more depending on contractor availability, project complexity, local market conditions, relationship pricing, and how the scope is packaged. Scopebase estimates are ranges, not bids.
Finish level assumptions
Estimates assume a mid-grade renovation finish unless you specify otherwise. High-end finishes, custom work, historic materials, or value-add specifications can significantly increase costs beyond the estimate range.
Timeline assumptions
Scopebase does not estimate renovation timelines, permit wait times, contractor availability, or holding costs associated with a longer-than-expected rehab.
What Always Requires Field Verification
The following items should never be relied upon from a Scopebase estimate alone. Always obtain licensed professional assessments before finalizing a deal.
- Foundation, structural, and roof condition — always require on-site licensed assessment
- HVAC age, condition, and replacement cost — field inspection by HVAC technician
- Plumbing and electrical capacity, age, and code compliance — licensed trades inspection
- Environmental hazards: asbestos, lead paint, mold, or soil contamination
- Permit history and open permits — require a title search and local permit office inquiry
- ARV (After Repair Value) — requires a licensed appraisal or comparable sales analysis
- Final contractor pricing — requires actual bids from licensed local contractors
How to Use Confidence Scores
Every Scopebase estimate includes a confidence score that reflects how much verifiable evidence supports the output. A high confidence score means the system found specific inspection findings, consistent regional pricing, and minimal missing items. A low confidence score means inputs were sparse, regional data was limited, or the system flagged significant unknowns.
Low confidence scores require proportionally more field verification before committing deal economics. Do not treat a low-confidence estimate as a reliable floor or ceiling for project cost.
Questions about methodology?
If you encountered a surprising estimate or want to understand a specific line item, contact support with your estimate ID and a description of the discrepancy.
support@scopebase.org