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

Certifications:

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

 
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