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County assessor outlines reassessment approach; officials warn many properties could see double-digit increases
Summary
Middlesex County's reassessment is about three-quarters complete; county assessor Jason Cowan told supervisors a new valuation model and upgraded data system will be applied and said typical residential assessments could rise 25–40 percent depending on size, age, and waterfront features.
The county's year-long reassessment project is progressing, but officials warned that many residential assessments could increase substantially when new valuations are applied.
Jason Cowan, the reassessment lead, told the Board of Supervisors on April 7 that field inspections are roughly 70–75% complete and the office is pausing some data entry pending a system upgrade that supports multiple land-rate entries per parcel. Cowan said the office has finalized depreciation tables and building-cost rates and will apply the cost approach (land value plus replacement cost new minus depreciation).
Cowan said an initial analysis suggests a typical residential assessment could rise between 25% and 40%, with individual results varying by home size, construction quality, age and features such as waterfront or marshland. He stressed the office will run multiple statistical checks, including the price-related differential (PRD), before sending notices.
Board members asked about treatment of marsh, power-line easements and flood zones; Cowan said those features will be handled via percentage adjustments rather than separate acre rates because location and extent on a parcel affect value.
Cowan also summarized market indicators — months of supply, days on market and median sale prices — and described the local market as "reasonably healthy," citing stable supply and rising median prices in recent months.
Next steps: data entry will resume after the software upgrade; staff will run statistical bias checks and present batch updates (timing cited for July). The assessor said notices will not be mailed until the office verifies statistical measures to avoid inequitable assessments.
The reassessment could affect property tax bills if the county's tax rate does not change to offset valuation shifts; supervisors discussed budgetary implications and asked the assessor to return with more granular analyses by decade built and by neighborhood.
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