Cymraeg

Sash Windows Repair- Practical heritage joinery

Tywi Centre

9-11 December (3-day Course)
£456

Sash Window Repair Course

Theory and Practical Training for Skilled Carpenters

Course Overview

This course is aimed at experienced carpenters who want to expand their expertise into the repair and conservation of traditional timber sash windows. The programme combines theory with hands-on practice, focusing on the specialist knowledge, techniques, and conservation principles needed to work confidently and effectively with historic joinery.

Course Content

  1. Historical and Technical Context
  • Development and evolution of sash windows in the UK.
  • Regional and stylistic variations in mouldings, proportions, and profiles.
  • Heritage significance and conservation values.
  1. Anatomy and Function
  • Detailed breakdown of sash window components: sashes, frame, beads, cords, weights, pulleys, and ironmongery.
  • How the weighted sash system functions.
  • Variations in joinery techniques across periods.
  1. Surveying and Assessment
  • Condition surveys: recording and evaluating defects.
  • Diagnosing common failures such as rot, distortion, wear, and mechanical issues.
  • Deciding when to repair, replace, or adapt.
  1. Conservation Principles
  • Minimum intervention and retention of historic fabric.
  • Using authentic methods and materials.
  • Listed building consent and legal considerations.
  1. Dismantling and Preparation
  • Safe and efficient removal of sashes, cords, beads, and weights.
  • Handling glass and fragile components without damage.
  • Preparing the frame for repair.
  1. Timber Repair Techniques
  • Identifying sound vs. unsound timber.
  • Timber selection for splicing and replacements.
  • Advanced joinery techniques: scarfing, splicing, let-in repairs.
  • Consolidation and resin repair — appropriate uses and limitations.
  1. Glazing and Weatherproofing
  • Traditional glazing with putty and glass types suitable for conservation work.
  • Repairing or replacing glazing bars and rails.
  • Options for discreet draught-proofing and thermal upgrades.
  1. Reassembly and Fine Adjustment
  • Rebalancing sash weights and ensuring smooth operation.
  • Refitting cords, beads, and ironmongery.
  • Achieving correct clearances and tolerances.
  1. Discussion about finishes and Long-Term Care
  • Preparation and application of breathable coatings.
  • Linseed oil, primers, and traditional paints.
  • Ongoing maintenance schedules to ensure durability.
  1. Practical Consolidation
  • Step-by-step sash repair carried out by participants under tutor supervision.
  • Full cycle: survey, dismantle, repair, reglaze, reassemble, and finish.
  • Quality control checks and troubleshooting.

 

👨‍🏫 Meet the Tutor – Tom Duxbury

Tom Duxbury brings over 30 years of hands-on experience in the construction industry, specialising in heritage joinery and building conservation. From crafting oars and sculls in his early career to running his own joinery business and working as a Conservation Officer and Trainer, Tom’s knowledge is rooted in real-world experience.

Tom holds a First-Class Honours degree in Building Conservation and Management and is currently studying for a Master’s in Building Conservation. His background includes:

  • Heritage Trainer & NVQ Assessor for Carmarthenshire County Council

  • Former Conservation Officer for the Brecon Beacons National Park

  • Lecturer at the University of Wales Trinity Saint David

  • Traditional Skills advocate with SPAB, CIOB & Building Limes Forum membership

His passion for traditional craftsmanship and decades of on-site experience make him the ideal guide for anyone wanting to deepen their understanding of heritage joinery.

Bring heritage to life. Learn, restore, and preserve with skill and care.

To book your place, please click on the button below

DECEMBER 9-11, 2025

Book now

To find out more about repairing and maintaining Traditional Sash Windows you can watch this short film.