The JB Proper Bostonian - We don't just make windows. We recreate history. Visit the JB Sash Site
The Product

  The JB Proper Bostonian Replacement Window is approved by the Historical Commission of Boston and recommended by architects, builders and remodelers. Each historical window is custom-made and provides the latest technology in energy efficiency.

Architectural Features:

  • Custom wood window that can mirror exactly what you currently have.
  • Servicing both commercial and residential buildings.
  • Solid wood window in pine or mahogany.
  • Custom frame to fit any brick or wood opening.
  • True divided light sash with insulated glass.
  • Muntin bars available in the size required to meet your specs.
  • Traditional glazing compound at muntin bars.
  • Low profile bronze spacer on insulated glass.
  • Architecturally correct sticking.
  • No visible jamb liner to exterior maintaining historic look.
  • Authentic Boston-style window frame.
  • Historic sill to match those in field.
  • Manufactured locally with over 65 years of experience.

Insulating Features:

  • Natural insulation of wood sash and frame.
  • Upgrades your single glazed windows to insulated glass.*
  • Tilt-In/Take-Out balance on bottom sash allows for expansion and contraction of wood.
  • Removal of existing weights and cords enables insulation of weight pockets.
  • Premium quality weather-stripping at top rail, bottom rail and meeting rail.
  • Grip-tight window lock.

*R-Value for insulated glass over two times greater than single glazing.


Home Improvement Contractor # 152085
Construction Supervisor's License # 67268
Lead RRP Certification # NAT-21346-0

Recent Areas Served:
Beacon Hill Boston - Historic Wood Replacement Windows for multi-floored apartment

Beacon Hill Boston - Historic Wood Replacement Windows for multi-floored apartment
Back Bay Boston - Historic Replacement Windows on multiple streets including Beacon Street, Commonwealth Ave and Marlborough Street
Back Bay Boston – Replaced historic transoms at 4 Yawkey Way, Fenway Park
South End Boston - Replaced 70 historic windows at Cathedral High
Salem, MA – Custom Historic Replacement Window of The Joseph Story House, Circa 1811
Marblehead, MA – Replaced historic windows at multiple private homes
Fisher College Replaced historic windows at this gorgeous Back Bay College

The Product
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