Record the details up front
Note location, timing, and any prior work. Photos and measurements improve the first conversation.
Read the local context
Before any quote is meaningful, settle two questions about this particular house. First, whether the property carries a local historic designation, which is address-specific and not predictable from how the street looks, and which can change the answer from replacement to repair. Second, what the existing windows actually are: original wood sash in the older districts is frequently repairable and sits in openings that are rarely standard sizes, while postwar aluminum is a straightforward swap. Measuring a few openings before shopping saves a great deal of rework.
Ask what gets hidden at the end
Sill condition against Durham's rolling watersheds, flashing detail, and how the new frame meets older brick or clapboard shape the result more than the glass package does. The scope should explain what's checked before it's sealed behind trim.
Compare full scopes, not just price
Protection, materials, permits, testing, and change-order rules should all be spelled out.
What official local sources add
Windows are the exterior element local historic designation most often governs. On a designated property, changes visible from the street can be reviewed, and that review can reach frame material, sash configuration and profile rather than merely glazing performance — sometimes with an expectation that original sash is repaired rather than replaced. None of that applies to an undesignated property on the same street, and neighborhood appearance is not a reliable proxy. Flood guidance reaches windows only through the scale of work on a mapped parcel.
Sources were reviewed June 20, 2026. Confirm parcel-specific flood zones, historic-district status, permits, and current requirements with the relevant authority before authorizing work.