Get the condition on paper
Write down where it shows up, when it started, whether weather seems connected, how it's progressed, and any repairs already made. A handful of photos and rough measurements make the first conversation go faster.
Read the local context
Which construction era the house belongs to decides this job more than any product comparison. In the mill-village cottages and the older river-city streets, openings are rarely standard sizes, original sash is frequently repairable, and coatings of that age can govern how the work may be carried out at all. The postwar subdivisions pushing north are the straightforward case, typically carrying aluminum or early insulated units where the frame rather than the glass is the weak point. Newer growth beyond them is a maintenance question. Confirm the era and the district status together, since the two often travel.
Find out what's about to get covered up
Install method, flashing approach, sill condition, frame material, glazing package, trim restoration, and sun exposure on that wall count for as much as the product itself. Put that requirement in the written scope before the crew moves on to finish work.
Judge the whole proposal, not the number
Look for coverage of protection, access, materials, permitting, testing, cleanup, restoration, what's excluded, warranty terms, and how change orders are priced.
What official local sources add
This is the trade the Board of Historic and Architectural Review reaches most directly. Columbus designates ten historic districts with published design guidelines, and in them windows are among the exterior elements most closely examined -- review can extend to sash configuration, material and profile rather than merely to thermal performance, and in some cases to whether original sash should be repaired instead of replaced. That is settled by address, not by how a street looks, and with ten districts in play it is worth confirming before anything is ordered. The 2038 plan does not reach an opening in a wall.
Sources were reviewed June 20, 2026. Flood zones, historic-district boundaries, and permit rules differ from parcel to parcel, so check current requirements directly with the City of Columbus before signing off on the work.