An office conversion appeal in the South Downs National Park has succeeded after an Inspector accepted evidence that a rural office building had attracted no tenants despite a lengthy marketing campaign. The decision of 20 October 2026 permits the change of use of The Woodmans, near Angmering, back to a residential dwelling.
South Downs National Park Authority had refused application SDNP/25/03093/FUL, questioning whether enough had been done to establish that the existing commercial use was no longer viable. It also raised concerns about the amount of private amenity space. Inspector C Housden concluded that both matters were satisfactorily addressed by the evidence and physical circumstances.
The office conversion appeal is noteworthy because the marketing report did not satisfy every documentary detail listed in the local plan appendix. The Inspector nevertheless found the overall campaign sufficiently robust. The decision is a practical illustration of weighing the real evidence of demand rather than treating every missing marketing document as automatically fatal.
What the office conversion appeal involved
The proposal was straightforward: change the use of an existing building from offices back to a Class C3 dwelling, without altering its external appearance. It concerns The Woodmans on Arundel Road, near Angmering, rather than the construction of a new house in the countryside. The distinction is important for assessing landscape impact and existing commercial use.
The South Downs Local Plan seeks to protect employment premises unless an appropriate marketing exercise demonstrates a lack of demand. Policy SD35 and Policy ER2 of the Angmering Neighbourhood Plan were relevant. The local plan indicates that a robust campaign lasting at least 12 months is normally expected before the loss of this type of employment use can be justified.
Here, the appellant’s professional agent had been marketing the office accommodation continuously since February 2025. The property was promoted through on-site boards, direct agent contact and online listings. Monthly rent levels were benchmarked against comparable premises, and the asking price had been reduced twice. The evidence recorded no enquiries or offers.
The Authority objected that the report lacked dated copies of the estate agent’s advertisements, sale particulars and evidence of advertising in local publications. These omissions were not disputed. The Inspector found, however, that the report described the property particulars, rents and lease options sufficiently to show that active marketing had been carried out.
The office conversion appeal therefore turned on the weight attached to a proactive, prolonged campaign with no interest. The Inspector was satisfied that there was no market demand for the office use and that its loss would accord with the relevant local policies, notwithstanding the incomplete appendix-style paperwork.
Marketing evidence: substance still matters
This is not a ruling that marketing requirements can simply be ignored. A different report containing unsupported assertions or a much shorter exercise might have attracted little weight. In this case, the combination of a professional agent, comparable pricing, repeated advertising methods, rent reductions and the lack of enquiries told a consistent story.
The Inspector specifically accepted that online methods and physical boards provided real opportunities for prospective occupiers to discover the premises. Missing local newspaper notices did not reverse the conclusion when the other channels had produced no meaningful interest. It was a planning judgement based on the whole record.
For businesses and landowners, an office conversion appeal such as this underlines the value of retaining dated listings, agency instructions, viewing records and details of every price adjustment from the outset. The applicant succeeded without some of that material, but assembling a complete record would ordinarily reduce the room for dispute at application stage.
Private garden space and living conditions
The second main issue was the amount of external amenity space available to future occupiers. The submitted floorplans did not clearly label the garden areas, but on the site visit the Inspector saw established private outdoor spaces on both sides of the building, within the application boundary.
The South Downs Design Guide suggests that larger dwellings should generally have private amenity space equivalent to at least 60% of their internal floorspace. The appeal paperwork did not include the relevant calculations. Even so, the Inspector considered that the outdoor areas were plainly capable of accommodating ordinary domestic activities, including sitting out, gardening and drying clothes.
On that basis, the proposal was found to provide suitable living conditions and to satisfy Policy SD5. The office conversion appeal demonstrates that the visible usability of actual land can be important when a plan does not present a complete numerical breakdown. It does not replace the need for accurate drawings when space is marginal.
Flood risk and biodiversity objections withdrawn
The Authority had originally raised concerns relating to flood risk and biodiversity. During the appeal, the appellant supplied a flood risk assessment and biodiversity net gain information. The Authority confirmed that the additional evidence satisfactorily addressed those reasons and did not continue to contest them as main issues.
The Environment Agency withdrew its objection after considering updated flood mapping, with a condition needed to secure the relevant finished floor and mitigation measures. The Inspector gave that statutory advice significant weight and found sufficient evidence that the home could be safe over its lifetime without increasing flood risk elsewhere.
Biodiversity measures included proposals for two ponds, additional tree planting and nesting boxes. The Inspector considered the evidence proportionate to the scale of the scheme. Permission was made subject to conditions securing the flood mitigation and biodiversity enhancements, alongside controls over external lighting within the National Park.
The Inspector also considered the setting of the nearby Grade II listed Old Cottage. As the development involved a change of use without external alteration, the setting would be preserved. There was no identified conflict with the statutory duty relating to that heritage asset or with the conservation purposes of the National Park.
Why the National Park appeal succeeded
The office conversion appeal succeeded because the claimed benefits and technical evidence matched the limited physical change proposed. Loss of employment premises was supported by substantive market testing; private amenity space was usable in practice; environmental concerns were resolved by additional evidence and appropriate conditions.
Some conditions requested by the Authority were considered unnecessary. For example, the Inspector declined an additional restriction requiring the building to remain in Class C3, because the permission itself was already for residential use. A proposed electric vehicle charging condition was also unnecessary because charging points had already been installed.
Applicants should not assume that a Class E office can always become a dwelling under permitted development rights. This was a full planning permission appeal assessed under the development plan, not a ruling on Class MA. The right route depends on the lawful existing use, the site and the particular planning controls applying to it.
For context, Planning Geek explains when a change of use needs planning permission and how to appeal a refused planning application. The precise requirements for marketing evidence must be checked against the applicable local policy.
The office conversion appeal decision is appeal reference 6006529. The original can be sought through the Planning Inspectorate case record, and the decision is also available via AppealBase. The decision is confined to its facts and is not binding court case law.
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