Commission debate over vinyl/fiberglass windows underscores cost constraints for historic restorations

Commissioners pressed staff and the applicant on whether the proposed replacement of historic windows with fiberglass or vinyl-like products would imperil the Zillstra Law Office's historic character. At the hearing, multiple commissioners emphasized that windows are a primary visual signifier of historic buildings and asked whether there are practical alternatives that meet guidelines and the applicant's budget.

Architect Stig Carlson said the French doors and other openings' historical provenance is unclear and that the building will be used as a single-family residence. Builder Tony Sherman told the commission that custom wood windows—especially in narrow, tall custom sizes—can cost several times more than the proposed fiberglass or composite options, making wood replication impractical for the project budget. "We find generally going to a wood clad... it's significantly more expensive," Sherman said. Staff explained the design guidelines tend to use softer language on materials and that staff's recommendation balanced historic appearance on street-facing elevations with pragmatic choices on secondary facades.

Commissioners discussed alternatives including composite wood-clad windows and the possibility of workshops to help owners find cost-effective historic-appropriate solutions. One commissioner noted that strict adherence to Secretary of the Interior standards can be practically impossible because of limited local craft capacity and cost; staff suggested outreach and incentives (grants, workshops) as part of a longer-term strategy to close the gap between ideal preservation practice and owner budgets.