Detail Library – New Details December 2025
House Extensions BLOG

On the Detail Library, a new set of timber frame extension details is now available. These drawings cover a wide range of construction junctions including windows, doors, eaves, rooflights, and flat roof parapets. The details explore multiple installation methods for both timber and aluminium-clad windows, offering flexibility in terms of appearance, performance, and future maintenance.

These details are featured in the new book House Extension Details by Aida Rodriguez Vega and Emma Walshaw.

New details include:

  • Triple glazed timber casement windows (plan and section views)
  • Triple glazed aluminium-clad timber windows (plan and section views)
  • Lift and slide timber door (plan and section views)
  • Timber framed wall to eaves (insulation between and over rafters)
  • Back gutter with vent at pitched roof to timber wall
  • Rooflight in slate pitched roof (top and side sections)
  • Timber wall to flat roof with PPC aluminium parapet
  • Timber wall to flat roof with minimal parapet

Explore the full set below.

EWT04B Triple glazed timber casement window in timber extension 2D
EWT07B - Sliding Timber Door Level Threshold in Timber Frame Wall Section 3D
ERT03 Back gutter with vent pitched roof to timber framed wall detail - extension slate roof 2D
EWT04B - Timber Frame Extension Window Detail Section V2 3D
EWT07B Lift and slide timber door in timber extension wall 2D
ERT03 - Back Gutter with Vent at Pitched Roof to Timber Wall 3D

Latest Article

Working in the construction sector, we have the ability to influence the emissions that directly arise from homes or commercial buildings. 

Our latest technical guide explores life cycle assessments, what they are and how they influence better design.

Life Cycle Assessments

If you are interested in joining our community, head over to the Detail Library to learn more about our platform and get yourself signed up.

The Detail Library provides hundreds of construction details for you to download and use adjust for your own projects. The details are available in 2D Revit, CAD dwg, and 3D SketchUp. You can start downloading straight away and build your own detail reference library. Not like other BIM libraries, the Detail Library contains fully resolved details rather than individual components.

Other recent posts…

Window Details Guide

Window Details Guide

Introduction Window details are one of those junctions where several performance requirements converge on a small amount of space. You're dealing with thermal bridging at the reveal, moisture management at the sill, structural support at the head, and airtightness...

Detail Library – New Details September 2026

Detail Library – New Details September 2026

On the Detail Library, this month we published the second set of passive solar shading details, focusing on sliding and folding shutter systems across a wider range of configurations and opening types. Where Set 1 covered fixed fins, brise soleil, roller shutters, and...

Architecture and the Environment 02 – Water

Architecture and the Environment 02 – Water

Introduction Water is becoming one of the biggest design challenges of our time. Globally, water scarcity is a sustainability issue just as important as energy use, affecting public health, ecosystems, agriculture and food production. 2.1 billion people of the world's...

0 Comments

Submit a Comment

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.