A Belgravia roof terrace has secured revised planning permission after an Inspector accepted changes to its rooftop structures and evidence about equipment noise. The appeal concerns Eaton Mews South in Westminster, where permission for a terrace and other alterations had already been granted in September 2023.
Inspector A Caines allowed the appeal on 15th October 2026. The new decision approves revised details through a replacement plans condition, removes a details condition which had fulfilled its purpose and retains controls protecting neighbouring occupiers.
I would distinguish the issue here from deciding whether a roof terrace should exist at all. That principle had already been accepted. The question was whether the changes now proposed would harm the conservation area, nearby listed buildings or neighbours living close to the rooftop equipment.
What changed in the Belgravia roof terrace appeal
The original Belgravia roof terrace permission covered a new roof terrace, a front canopy, window and other elevation changes, paving alterations and an air-conditioning condenser within an acoustic enclosure. Detailed elements were subsequently approved by the council under condition 5, with its decision confirming that the condition had been fully discharged.
Some works had already been carried out. The appeal therefore proceeded under section 73A of the planning legislation, which in this case provided the route for considering development undertaken without complying with conditions attached to the earlier permission. The application sought part-retrospective approval of revised roof-level structures and acoustic details.
The Belgravia roof terrace proposal included a larger roof access enclosure, low storage boxes and a rooflight serving the stairwell. The access enclosure remained subordinate to the host building and visually contained within the terrace. Caines found that it would not appear as an additional storey or materially change the established scale of development in the mews.
Visibility did not establish heritage harm
The site is within the Belgravia Conservation Area, whose significance includes its nineteenth-century terraces and squares and the network of modest mews streets behind them. Nearby listed terraces also formed part of the assessment. The Inspector considered both the conservation area’s character and the contribution of the setting to the listed buildings’ significance.
The storage boxes would be visible from some surrounding terraces, but their low scale and position alongside the main access structure were important. Taken together, the rooftop features would remain secondary elements within a varied urban roofscape where access structures and plant enclosures were already present.
For the Belgravia roof terrace, the Inspector’s assessment was that the revisions would preserve the conservation area’s significance, character and appearance. The setting and significance of nearby listed buildings would also be preserved. Limited visibility alone did not amount to an identified harmful effect on what made those assets important.
The stairwell rooflight was considered separately. Some light might be apparent after dark, but its scale was limited and the site sits in a densely developed part of central London with established artificial lighting. The Inspector did not find a harmful visual effect in that context.
Noise evidence answered the council’s concern
Westminster’s concerns about the equipment centred on whether enough information had been supplied to assess noise. The appeal included detailed drawings showing the construction and acoustic treatment of enclosures, alongside a noise impact assessment covering the air-conditioning condenser and boiler equipment.
The assessment tested operation against the council’s environmental guidance and concluded that its standards would be met at the nearest identified noise-sensitive locations. Caines recorded: “I have been provided with no persuasive technical evidence to indicate otherwise.” That finding was tied to the evidence before the Inspector, rather than an assumption that rooftop machinery is harmless.
Noise controls remain attached to the Belgravia roof terrace permission. Condition 6 regulates emissions from plant and machinery, including different limits where sound is tonal or intermittent. The decision also retains a condition limiting transmitted vibration. Neighbours therefore retain the protection of enforceable planning conditions despite the successful appeal.
I would read the acoustic drawings and those conditions together before changing any equipment. The Inspector accepted the installation assessed in the appeal. That does not establish that a different condenser, enclosure or operating arrangement would have the same effects or meet the retained limits.
Why the old details condition was not repeated
The Inspector replaced condition 1 with a list of approved drawings, providing certainty about the permitted scheme. Condition 5 was not reimposed because its earlier requirements had been discharged and the revised details were now being approved through the appeal drawings themselves.
Caines explained that the condition “has fulfilled its purpose”. The remaining conditions were reimposed, keeping their previous numbering, which is why the schedule moves from condition 4 to condition 6. No new time-limit condition was necessary because works had already commenced.
Other retained requirements cover working hours and external materials. Condition 4 continues to prohibit structures such as canopies, fences, loggias, trellises and satellite or radio antennae on the terrace. Success in this Belgravia roof terrace appeal is therefore not an unrestricted permission to add further rooftop features.
The official six-page decision and condition schedule should be read as a whole. The appeal reference is 6011518, the application is 25/08798/FULL and the original permission is 23/04675/FULL. The decision is an English planning appeal, not a court judgment or a general change to conservation-area controls.
Our planning appeals guide explains the wider process. For a project already under way, I would first compare the original permission, discharged details and current drawings. This case shows how that documented planning history can define the question an Inspector actually needs to decide.
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