The "GPDO Part 1 (All Classes) - LDC Appeal Decisions" document has been updated to include 4 additional appeal decisions relating to householder permitted development legislation, for which the conclusions are as follows:

December 2019 - Code a01098 (appeal allowed):

• This appeal decision provides an example of where it was concluded that a particular roof extension does constitute “an enlargement which joins the original roof to the roof of a rear or side extension” for the purposes of B.2(b). (*)
  [Note: The Inspector comments on the hypothetical situation “Even if the rear projection were an extension”].
  [Note: The proposed roof extension would join the main rear roof onto the flat roof of the existing (non-original) two-storey rear extension].
• For the purposes of the post-06/04/2014 version(s) of Part 1 of the GPDO, where a property has a non-original rear extension with a flat roof, which is lower than the main rear roof, then an “L”-shaped roof extension (or similar) that extends from the main rear roof onto the flat roof of the non-original rear extension is permitted development. [Note: The roof extension, for all of its (rearmost) width, extends across the original rear eaves (none of which have previously been removed by the non-original rear extension)]. (*)
  [Note: The Inspector comments on the hypothetical situation “Even if the rear projection were an extension”].
  [Note: The flat roof of the non-original rear extension is actually at the same level as the eaves of the main rear roof].
  [Conclusion: The works comply with Class B. In particular, the works comply with B.2(b) on the basis that the roof extension does constitute “an enlargement which joins the original roof to the roof of a rear or side extension”].
• Where a property has a secondary roof that’s slightly lower than the main roof, then an extension on top of this secondary roof should be assessed against Class B (i.e. rather than Class A). (*)
  [Note: The secondary roof is the roof of an original two-storey rear projection on a two-storey house].
• The phrase “the highest part of the ... roof” relates to the property as a whole (i.e. not only to the part of the property that’s being altered or enlarged). (*)
• For example, where a property has a secondary roof that’s lower than the main roof, then an extension on top of this secondary roof can be higher than the highest part of this secondary roof (i.e. so long as the extension is not higher than the highest part of the main roof). (*)
  [Note: The extension is higher than the ridge-line of the original two-storey rear projection].

December 2019 - Code a01097 (appeal allowed):

• In the second of the above diagrams, (at least) part of “Roof Extension D” “extends beyond” the outside face of “Wall 1” (i.e. for the purposes of B.2(b)(ii)). [Note: The diagrams are viewable within the “Extend beyond” topic of this document]. (*)
  [Note: The rear projection is a non-original two-storey rear extension that covers all of “Wall 1”. It’s not clear whether the Inspector concludes that the roof extension “extends beyond” 1) the outside face of the covered “Wall 1”, or 2) the outside face of “Wall 2”].
  [Conclusion: The roof extension does comply with B.2(b)(ii) on the basis that it constitutes “an enlargement which joins the original roof to the roof of a rear or side extension”].
• This appeal decision provides an example of where it was concluded that a particular roof extension does constitute “an enlargement which joins the original roof to the roof of a rear or side extension” for the purposes of B.2(b). (*)
  [Note: The proposed roof extension would join the main rear roof onto the pitched roof of the existing (non-original) two-storey rear extension].
• For the purposes of the post-06/04/2014 version(s) of Part 1 of the GPDO, where a property has a non-original rear extension with a side-facing pitched roof, none of which is lower than the main rear roof, then an “L”-shaped roof extension (or similar) that extends from the main rear roof onto the side roof of the non-original rear extension is permitted development. [Note: The roof extension, for all of its (rearmost) width, extends across the original rear eaves (all of which have previously been removed by the non-original rear extension)].
  [Note: The eaves of the non-original rear extension are actually at the same level as the eaves of the main rear roof].
  [Conclusion: The works comply with Class B. In particular, the works comply with B.2(b) on the basis that the roof extension does constitute “an enlargement which joins the original roof to the roof of a rear or side extension”].
• Where a property has a secondary roof that’s slightly lower than the main roof, then an extension on top of this secondary roof should be assessed against Class B (i.e. rather than Class A). (*)
  [Note: The secondary roof is the roof of a non-original two-storey rear extension on a two-storey house].
• The phrase “the highest part of the ... roof” relates to the property as a whole (i.e. not only to the part of the property that’s being altered or enlarged). (*)
• For example, where a property has a secondary roof that’s lower than the main roof, then an extension on top of this secondary roof can be higher than the highest part of this secondary roof (i.e. so long as the extension is not higher than the highest part of the main roof). (*)
  [Note: The extension is higher than the ridge-line of the non-original two-storey rear extension].

December 2019 - Code a01096 (appeal allowed):

• [Note: To view these conclusions, please log onto the website as a member].

December 2019 - Code a01095 (appeal allowed):

• [Note: To view these conclusions, please log onto the website as a member].

Notes:

• To view the conclusions, summaries, and decision notices for any of the above appeals, please view the "GPDO Part 1 (All Classes) - LDC Appeal Decisions" document. As a member of the Planning Jungle website, you can view the decision notices for all of the appeals on the website for no extra cost.
• Any of the above conclusions marked with a "(*)" contradict other appeal decisions. The "Reference Section" within the above document indicates how many appeals have supported and contradicted each particular conclusion.