The symptom
I want fresh air through the upper section while the lower section stays closed, with the option to operate both sections together.
The proposed method
Confirm the selected split-door assembly and how the upper and lower sections are intended to operate. Ask which connecting hardware, latches, shelf and seals are included and how the frame and threshold will be handled. Agree on finishing responsibilities and checks of the two sections operating separately and together.
Items to discuss
Dutch door leaves, prehung jamb, hinges, shelf, quadrant bolt, weather seals, threshold, lock hardware. Clarify which parts or materials would be supplied, which tools would be used, and what documentation is included.
Property context in Hillsborough
Hillsborough incorporated in 1910 after estate owners chose to preserve its residential, rural character rather than join nearby cities.
Source for building history ↗Its incorporation history specifically centers on estate owners protecting a residential setting, a useful cue to expect detached residential properties rather than a downtown commercial mix.
Source for housing context ↗In San Mateo County's incorporated cities the building department for the city that covers the address is the permitting authority, not the county. The Contractors State License Board's consumer page on building permits states the California Building Standards Code position that work may not be erected, altered, repaired or demolished without a permit first obtained from the building official, notes that code requirements vary between cities and counties, and asks readers to check with their local building department. Confirm the scope with that department before work is arranged.
Source for planning your work ↗Area-wide context is not a finding about your own property.
What shapes the quote?
The component being changed
Glass-only, hardware-only and complete-frame work involve different materials and labor. Compare proposals for the same work.
Access and concealed condition
Opening size, access, finishes and damage discovered during removal can change the work. Agree how any change will be documented.
The complete proposal
Clarify removal, disposal, weatherproofing, finish restoration and completion checks before comparing totals.
Ask for a written quote and confirm the complete charge before work begins.
Before the visit
A little preparation helps.
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