Enclosed outdoor kitchen: from what point does it become a conservatory?
An outdoor kitchen enclosed with walls or glazed openings is treated as a conservatory because it creates floor area, in addition to the footprint. This guide explains the difference between an open and an enclosed kitchen, its administrative implications, and the specific case of a partial enclosure.
What makes an outdoor kitchen count as a conservatory
An outdoor kitchen enclosed with sliding walls or glazed openings is treated as a conservatory: it creates floor area, in addition to the footprint it already occupied. It remains subject to the same thresholds as any construction (5, 20 or 40 m²), but you must now check both values—footprint and floor area—and use whichever is higher.
Open vs enclosed outdoor kitchen: the distinction that changes everything
A structure that is open on most sides does not create floor area, even if it is covered.
Conversely, a full enclosure with walls or glazed openings is treated as an enclosed room, with all the regulatory consequences that entails.
What this changes for your administrative steps
Enclosing a structure almost always changes the exterior appearance of the house at the connection point, which triggers at least a prior declaration, even below the area thresholds.
Another point to plan for: if the total floor area of your home, including the conservatory, exceeds 150 m², using an architect becomes mandatory to submit the planning application.
Turning your outdoor kitchen into a conservatory increases your home’s habitable floor area. This change must be declared to your home insurance; otherwise, you risk reduced cover—or even refusal of compensation—if a claim arises in this space.
Warning
Partial enclosure (one or two sides): what status?
A partial enclosure is often regarded as a light extension, requiring at least a prior declaration depending on the floor area. This should be confirmed case by case with your local council’s planning department.
“Removable or retractable panels are not a permanent enclosure.”
In practice, the authorities may consider an enclosure to be permanent as soon as it is used for most of the year, even if it is technically demountable. The criterion applied is actual use, not technical reversibility alone.
Common misconception
Our tips for keeping things as straightforward as possible
If you do not wish to move into the conservatory category, opt for a removable solution to shelter your kitchen area from wind, rain, or overlooking neighbours: a retractable screen, a retractable awning, or a removable privacy screen, rather than a fixed, permanent enclosure.
A key point to watch, as mentioned above in the common misconception: even a technically demountable system can be reclassified as a permanent enclosure if it stays in place for most of the year. To keep things as straightforward as possible, it is therefore best to fold away or remove these protections outside the periods when they are genuinely useful.
This way, you keep the comfort of a sheltered space without changing the regulatory status of your installation.
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