September 2024 – New Details

We are delighted to share our first set of house extension details. These details focus on some of the most challenging parts of a new house extension design – party walls and foundations.

This set is designed to provide guidance and suggestions for detailing party walls and foundations in different situations.

The house extension masonry party wall detail set consists of:

  • Existing Party Wall with New Offset Boundary Wall
  • New Boundary Masonry Wall Foundation
  • Existing Party Wall to New Masonry Party Wall
  • Existing Party Wall to New Masonry Party Wall Aligned
  • New Masonry Party Wall Corner Plan Detail
  • New Masonry Party Wall Foundation
  • Existing Party Wall to New Masonry Separating Party Wall
  • New Masonry Separating Party Wall to Exterior Wall Detail
  • New Separating Party Wall Foundation
  • Trench Foundation Abutting Existing Masonry Party Wall
  • Trench Foundation Abutting Existing Masonry Cavity Party Wall

Stay tuned to the website as we continue to develop and release exciting new construction details every month!

Check out this month’s full set below.

New Details

EPW01 – Existing Party Wall with New Offset Boundary Wall

EPW01 - Existing Party Wall with New Offset Boundary Wall - Image 2

EPW02 – New Boundary Masonry Wall Foundation

EPW02 New boundary cavity masonry wall beam and block floor - Section 2D
EPW02 New boundary cavity masonry wall beam and block floor - Section 3D

EPW03 – Existing Party Wall to New Masonry Party Wall

EPW03 Existing solid masonry party wall to new centred wall - Plan 2D
EPW03 - Existing Party Wall to New Masonry Party Wall - Image 2

EPW04 – Existing Party Wall to New Masonry Party Wall Aligned

EPW04 Existing solid masonry party wall to new aligned with existing visible face - Plan 2D
EPW04 Existing solid masonry party wall to new aligned with existing visible face - Plan 3D

EPW05 – New Masonry Party Wall Corner Plan Detail

EPW05 New party cavity masonry wall corner, varying party wall positions - Plan 2D
EPW05 - New Masonry Party Wall Corner Plan Detail - Image 2

EPW06 – New Masonry Party Wall Foundation

EPW06 New party cavity masonry wall varying party wall positions - Section 2D
EPW06 New party cavity masonry wall varying party wall positions - Section 3D

EPW07 – Existing Party Wall to New Masonry Separating Party Wall

EPW07 Existing solid masonry party wall to new separating party cavity masonry wall - Plan 2D
EPW07 Existing solid masonry party wall to new separating party cavity masonry wall - Plan 3D

EPW08 – New Masonry Separating Party Wall to Exterior Wall Detail

EPW08 New separating party cavity masonry wall to exterior wall junction - Plan 2D
EPW08 New separating party cavity masonry wall to exterior wall junction - Plan 3D

EPW09 – New Separating Party Wall Foundation

EPW09 New separating party cavity masonry wall, trench fill foundation - Section 2D
EPW09 New separating party cavity masonry wall, trench fill foundation - Section 3D

EPW10 – Trench Foundation Abutting Existing Masonry Party Wall

EPW10 Cantilevered RC slab floor with trench foundation to existing solid masonry party wall 2D
EPW10 Cantilevered RC slab floor with trench foundation to existing solid masonry party wall 3D

EPW11 – Trench Foundation Abutting Existing Masonry Cavity Party Wall

EPW11 Cantilevered beam and block floor to existing masonry cavity party wall 2D
EPW11 Cantilevered beam and block floor to existing masonry cavity party wall 3D

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Check out our associated blog post which explores The Party Wall Act and its influence over architectural projects.

09 The Party Wall Act