Ricki Sage: home business and material change of use
Ricki Sage [2021] EWHC 2885 (Admin) concerns a personal-training business operated from an outbuilding in a residential garden. The court upheld the inspector’s conclusion that the activity had changed the property to a mixed residential and business use.
The question was whether permission was required, not whether this particular business deserved permission. This is different litigation from Sage [2003], which concerned completion of building operations.
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- Neutral citation
- [2021] EWHC 2885 (Admin)
- Court
- High Court, Planning Court
- Judgment date
- 28th October 2021
- Judge
- Sir Duncan Ouseley
- Case number
- CO/998/2021
A quiet business can still change the use
Mr Sage trained paying clients in a garden gym at his home in Beckenham. Evidence concerned regular sessions over six days each week, with customers using the shared side access and garden.
The acoustic evidence and supportive neighbours did not resolve the planning question. Noise and other effects may help show the nature and scale of an activity, but the legal question is whether the character of the use has materially changed.
A material change of use can occur without an unacceptable noise impact. Conversely, an impact is not a substitute for identifying what has actually changed in the use of the land.
Secondary does not always mean incidental
A home may remain mainly residential while acquiring a separate business use. An activity being smaller than the residential use does not necessarily make it ancillary or reasonably incidental to living there.
The court distinguished occasional work-related visitors from routine customer visits. The nature of the activity, its frequency, hours, scale and the particular property all mattered. It did not set a universal daily limit on customers.
Read Burdle on identifying the planning unit and Wallington on incidental domestic purposes. The whole house and curtilage were the agreed planning unit in this case.
The certificate application needed a precise description
The judgment also criticised the lack of precision in the application. A broad label or an assertion that there has been no material change is not an adequate substitute for describing the activity for which lawfulness is claimed.
For this existing-use application, the relevant activity was that at the application date. Lower visitor numbers during later coronavirus restrictions did not change the evidence needed for that date.
The court explained that a certificate is not a conditional planning permission. A later departure from its description does not automatically constitute a breach of a planning condition; the authority would need to establish the relevant unlawful development.
What the judgment does not say
Ricki Sage does not require permission for every home office. It requires the actual use to be assessed rather than relying on a slogan that the home remains a residence first and a business second.
The judgment’s comments about national guidance concern the wording before the court in 2021. They are not a statement that every later version of that guidance is unchanged.
Read the Ricki Sage judgment
The complete judgment is available to Gold Members.
Ricki Sage Case Law Page Updated: 12th September 2026