R (on the application of LW Zenith Ltd) v Secretary of State for Levelling Up, Housing and Communities [2022] EWHC 3317 (Admin)
LW Zenith is an important Planning Court judgment on prior approval conditions and the relationship between a permitted change of use and separate operational development. The court held that, where separate planning permission already existed for window works needed to satisfy the prior-approval natural-light requirement, a negative condition preventing occupation until those works were completed was capable of being a lawful and obvious solution.
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- Neutral citation
- [2022] EWHC 3317 (Admin)
- Court
- High Court of Justice, King's Bench Division, Planning Court
- Judgment date
- 21st December 2022
- Judge
- HHJ Jarman KC (sitting as a judge of the High Court)
- Case number
- CO/1057/2022
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What LW Zenith decided
LW Zenith wanted to convert Zenith House in Fleet from offices to 34 flats under the former Class O office-to-residential permitted development right. Twenty-three of the proposed flats could achieve adequate natural light using the building as it stood. Eleven needed additional windows in the roof and ground floor.
Those window works were not themselves part of the Class O permitted development. However, they already had a separate planning permission granted in 2019, which was still extant when the Inspector determined the prior-approval appeal.
The Inspector refused prior approval. She considered that conditioning the prior approval around the separate operational development would go beyond the deliberately light-touch process. The High Court quashed that decision.
A prior approval cannot grant permission for works outside the permitted development right
The judgment maintains an important boundary. A prior-approval application is not an ordinary planning application, and it cannot be used to grant planning permission for operational development that falls outside the relevant permitted development right.
If the additional windows had not already had planning permission, the Inspector could not have used the Class O prior-approval process to decide whether the window works themselves were acceptable.
But that was not the position here. The window works had already been separately approved on their planning merits.
A negative condition could link occupation to the separate permission
Paragraph W(13) of the GPDO allowed prior approval to be granted subject to conditions reasonably related to the subject matter of the prior approval.
Natural light was one of the matters requiring approval. The court held that there was nothing preventing a negative condition which stopped the flats being occupied until the separately permitted windows had been installed.
That condition would not itself grant permission for the windows. It would simply prevent occupation of the permitted residential use until the already authorised operational works had been carried out.
The obvious solution still had to be considered
The court did not impose a general duty on Inspectors to invent conditions whenever an applicant has failed to suggest one. The authorities recognise that Inspectors are not normally required to cast around for solutions.
LW Zenith was different because the negative condition was an obvious and simple answer to the precise problem before the Inspector. By failing to grapple with that option, the Inspector failed to take account of a material consideration.
Procedural fairness was a separate problem
The local planning authority had sent the Inspector supplementary comments arguing against tying the prior approval to the separate planning permission. Those comments were not shared with LW Zenith before the appeal was decided.
The court held that fairness required the claimant to have an opportunity to respond. Had that happened, there was a real possibility that the negative occupation condition and the arguments supporting it would have been put forward and could have affected the outcome.
Class O has gone, but the principle remains useful
The case concerned the former Class O office-to-residential right and should not be read as a guide to the current wording of that expired class.
Its wider value is the distinction between the planning permission granted by a permitted development right, the limited matters controlled through prior approval, and separate operational works which may need their own permission. The reasoning has since been useful in current prior-approval cases where separately permitted works can make a scheme acceptable.
Read the full LW Zenith judgment
The approved Planning Court judgment is held in the Planning Geek case law library. Gold Members can open the protected PDF below. If you are not signed in with Gold access, the button will take you to the appropriate membership option.
Related Planning Geek guidance
For the process itself, see prior approval and our guide to planning conditions. The current office, shop and other Class E to residential route is Class MA. Planning Geek has also reported a later Class MA appeal where separately permitted window works and a negative occupation condition were used successfully.
LW Zenith Case Law Page Updated: 9th September 2026