A Derby annexe has won planning permission to become a separate one-bedroom home after an inspector overturned the city council’s refusal. The decision, issued on 13th October 2026, concerns an existing building on a corner plot at Radbourne Lane and Aldersgate in Derby.
The council’s objection centred on the living conditions future residents would experience, particularly the bedroom’s restricted outlook, daylight and the size of the private outdoor space. Inspector J Buxton found these acceptable for the dwelling proposed and allowed the change of use, subject to three conditions.
I would focus on what the inspector actually assessed here: the bedroom’s existing relationship with neighbouring buildings, the more open outlook from the main living space and whether the garden would be usable and private. A compact home still needs satisfactory living conditions, but this decision shows why those questions require a site-specific assessment.
Why the Derby annexe was considered acceptable
Appeal 6013914 followed Derby City Council’s refusal of application 26/00295/FUL. The building lies behind an end-of-terrace house and is connected to it by a link extension. The surrounding neighbourhood contains terraced, semi-detached and detached homes, and the plot is enclosed by walls, fencing and mature planting.
The proposal would create an independent home with an open-plan living, dining and kitchen area. Full-height glazed doors would face towards Aldersgate and provide access to the garden. Other windows would also benefit from an open aspect. A fence would divide the rear yards of the proposed dwelling and the main house.
The Derby annexe already contained the bedroom window which concerned the council. It sits close to the boundary with the main house, so nearby built form limits the outlook. The inspector accepted that the view would be “more restricted than may be experienced in some dwellings”, but the proposal would not materially alter that existing relationship.
Having visited the property, the inspector found that the small single bedroom would continue to receive natural light and have an outlook. He concluded that the dwelling would provide satisfactory conditions in those respects and comply with the relevant local planning policies.
A small garden still had a practical function
The Derby annexe would have outdoor space to its front, screened from the highway by an established hedge and separated from the main house’s garden by a fence. The inspector accepted that the space was modest, but considered its enclosure and privacy important to how it would work.
It would offer a usable place to sit outside and undertake ordinary domestic activities. For a dwelling of this scale, the inspector found that sufficient. He therefore disagreed with the council’s concern about private outdoor amenity space.
There is no garden-area figure in the decision that could sensibly be lifted into a universal minimum for other proposals. The conclusion concerns this space, its boundaries and the size of the dwelling it would serve. Anyone assessing another annexe conversion would need to examine those practical relationships afresh.
Parking must be ready before occupation
The Derby annexe permission is subject to a specific safeguard for the original house. Before the new dwelling is occupied, the replacement parking area serving the main home and the associated vehicular access shown on the approved plans must be provided.
The parking area must use a hard-bound surface for at least five metres behind the highway boundary. It must also incorporate measures preventing surface water from running onto the public highway. Both the parking area and access must then be retained for the development’s lifetime.
The decision also requires development to begin within three years and to follow the approved drawings. The inspector combined the highway authority’s related parking and access requirements into one condition to make them more precise and avoid unnecessary duplication.
I would check that occupation trigger carefully if buying, funding or implementing the permission. A successful appeal does not remove the need to comply with its conditions, and this one expressly links occupation of the new home to completing the arrangements for the original property.
A separate dwelling, rather than ancillary accommodation
The Derby annexe decision approves a change to an independent dwelling in use class C3. The council did not dispute the principle of residential use, and the highway authority did not object to the proposed parking changes. Those agreed matters helped narrow the appeal to future residents’ living conditions.
That is a different situation from an annexe permitted only as accommodation ancillary to a main home. In the recently reported Gloucester annexe appeal, a condition retained that connection. The wording of each permission matters when deciding whether a building can operate independently.
The full official Derby decision describes the scheme as making efficient use of an existing building in a sustainable location and making a modest contribution to housing supply. Those benefits supported approval alongside the finding that the proposed living conditions were satisfactory.
For a property owner considering a similar conversion, I would take the practical lesson from the evidence rather than the outcome alone. The existing windows, usable garden, separation from the original home and replacement parking all need to be understood. For the Derby annexe, the inspector’s assessment was that the proposed one-bedroom dwelling met the relevant planning requirements.
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