Case Study • Heritage Restoration

Conservation Sash Windows & External Doors

Grade II listed approved traditional box sash joinery, slimline heritage double glazing, and Accoya® durability in Burford.

Heritage Conservation

Authentic Georgian Glazing on Burford High Street

A late-Georgian townhouse on Burford High Street required the complete replication and replacement of 14 deteriorated external timber box sash windows and a substantial six-panel solid timber front entrance door.

Located squarely within a designated Conservation Area, the property's fenestration was subject to rigorous scrutiny by West Oxfordshire conservation officers. Modern standard double-glazed PVC-U or aluminum units were strictly forbidden. The commission demanded authentic cords, weights, solid brass axle pulleys, and ultra-slender 18mm true glazing bars.

Heritage box sash windows and front door
Conservation Technology

Thermal Efficiency Meets Historic Authenticity

11mm Slimline Krypton Glazing

To satisfy conservation guidelines, we incorporated heritage ultra-slim double-glazed units filled with high-density Krypton gas. Achieving a commendable U-value of 1.3 W/m²K, they prevent condensation and heat loss while maintaining historic sightlines.

Accoya® Dimensional Stability

Window sashes and frames were machined from acetylated Accoya® timber paired with seasoned English oak cills. Accoya® exhibits virtually zero seasonal movement, ensuring sashes slide effortlessly without binding during wet winter months.

Traditional Lead Counterweights

Operating on wax-dipped braided cotton sash cords, cast solid brass axle pulleys, and calibrated lead counterweights. Our integrated perimeter brush draught-proofing remains completely concealed within the parting beads and staff beads.

Fenestration Technical Specifications
Location High Street, Burford, Oxfordshire (Georgian Townhouse)
Timber Species Accoya® Certified Wood with Prime English Oak Sub-Cills
Glazing Specification 11mm Heritage Slimline Double Glazing (4mm / 3mm Krypton / 4mm Soft-Coat)
Thermal Performance Whole Window U-Value: 1.3 W/m²K (Compliant with Approved Document L)
Operating Mechanism Traditional Waxed Cotton Cord, Solid Brass Pulleys & Lead Weights
Entrance Door Spec 57mm Solid Timber 6-Panel with 5-Point British Standard Multi-Lock
Planning Approval Full Listed Building Consent & Conservation Officer Sign-off

"Replacing windows on a listed building on Burford High Street was a daunting planning challenge. Cotswold Woodcraft worked closely with our conservation officer, produced exact profile drawings, and installed windows that eliminate road noise and draughts while looking 100% authentic."

— Eleanor & David Pritchard, Property Owners
Private Commissions & Architectural Millwork

Planning a Bespoke Timber Commission?

Whether consulting for an Oxfordshire country residence, a London townhouse, or a Grade II listed heritage restoration, our master joiners provide comprehensive technical design, timber guidance, and white-glove installation.