Concord’s project to visit and reassess every property in the city is continuing to move through the South End, with property owners roughly between Broadway and I-93 next on the list.

Every five years, the city is legally obligated to reappraise all property. But those updates, called statistical revaluations, are mostly based on existing information about a property that’s kept in the assessor’s office, such as its size, number of bedrooms, and heating system.

Over the next eighteen months or so, for the first time since 1990, assessors are going to all 15,000 properties in the city to do internal and external physical inspections — called a full measure and list. It means that property values will be determined using an in-person inspection rather than an estimate based on the sales of surrounding and similar properties. The information collected about properties now will be used to estimate new values for years to come.

Assessors are going neighborhood by neighborhood throughout the city. They started in the Southeast corner, and this week started moving more into the heart of the South End: on the assessor’s map, that’s neighborhood 15.

If you don’t want to let the assessor into your home or onto your property, you don’t have to. Stephen Whalen, the project manager for Vision Government Solutions, who is leading this effort for the city has said, though, that allowing an inspection will lead to a more accurate value of a home.

Conversely, residents who don’t want any surprises can set an appointment with the assessment office to ensure that they’re home and in the driver’s seat for the inspection process.

The Monitor is looking to talk to homeowners about their experience with the revaluation and — for those who set an appointment with the assessor — join people during the process. If you’re interested, please email cmclaughlin@cmonitor.com