- Decision
- dismissed, 11 September 2026
- Decided by
- Planning Inspector: Paul Martinson
- Authority
- Leeds (Yorkshire and the Humber)
- Appeal reference
- 6007479
- Application reference
- 25/06103/FU
- Procedure
- written representations
- Development
- Replacement of Yorkshire sliding sash and vertical sash windows with double-glazed timber units at a Grade II house in Colton CA (planning Appeal B; linked LBC Appeal A 6007478)
- Site context
- conservation area, listed building setting
- Green Belt
- No
- Framework applied
- August 2026 NPPF
- Determinative policies
- HE6(4)
- Development plan policies
- Leeds Core Strategy 2014 P10, P11, Leeds UDP Review 2006 N14, N17, N20
- Main issues
- listed building; conservation area
Summary
Double-glazed replacements for authentic-looking Yorkshire sliding sashes at a Grade II house were refused. The inspector refers to the new Framework's HE6 but uses the 2024 'great weight' and 'less than substantial' language (DL 23-24).
What made the difference
The loss of the local Yorkshire sash style with thick modern frames. Less harmful energy-efficiency options had not been explored (DL 19, 26).
Policy findings
Policy codes are those of the National Planning Policy Framework (August 2026) unless a development plan is named.
| Policy | Finding | Weight | Note |
|---|---|---|---|
| HE6(1) | harm | great | 'moderate to high level of less than substantial harm'; framed with 'great weight' although it cites the new Framework (DL 23) |
| HE6(4) | fail | thermal and security benefits limited; secondary or slimmer glazing not ruled out (DL 24-28) |
Key facts
- Existing windows not historic but authentic in proportion and style (DL 12)
- No existing-window drawings or position details were supplied (DL 16)
Related decisions
Sources
This note is one of the decisions behind the NPPF 2026 Navigator, which shows how each Framework test has been applied across all the decisions in the database. Also available as Markdown.