Converting a unit into a flat: what the association can say

A unit turned into a studio means one more occupant, networks used differently, and an allocation key that no longer fits.

A shop empty for two years, a former workshop, a large cellar, a garage: in tight markets those spaces are worth far more converted into housing. The operation is frequent, and the board often discovers it once the works have started.

It deserves examination, because it touches three things at once: the building’s designated use, the shared networks and the allocation of charges.

What the building rules say

The first document to open is the rules: they set the building’s designated use and, often, the assignment of each unit. A unit expressly designated commercial does not become housing by its owner’s will alone.

Changing a unit’s designated use is in principle a general meeting decision, at a majority depending on what it affects. See the building rules and private works and common areas.

Works that touch the common areas

• Creating or moving drainage connected to the common stacks.
• Creating an opening, window or door in the façade.
• Altering ventilation or connecting to a common duct.
• Cutting a load-bearing wall, or changing access from the common areas.
• Adding meters and upgrading the electrical supply.

The first is the most frequent and the heaviest in consequence: connecting a bathroom and a kitchen to a stack sized for a unit with no sanitary use causes recurring blockages. See cleaning the waste stacks and electrical rising mains.

The effect on charges

A unit converted into housing changes use: it consumes water, produces waste, uses the circulation areas, sometimes the lift. Yet its shares and allocation keys were set for a different use.

The allocation question must therefore be raised at the same time as the change of use, not three years later as a challenge. See how charges are calculated and challenging an allocation.

Habitability warnings

Not every space can become housing: ceiling height, natural light, ventilation and access to open air are subject to decency requirements. A windowless basement turned into a studio raises a problem beyond the association.

The board does not police habitability, but it can legitimately alert the manager where a conversion looks plainly unsuitable, notably regarding fire safety and escape routes.

Good practice

As with splitting a unit, the useful reflex is to act early: ask for the item to go on the agenda as soon as the project is known, rather than noting finished works.

A project presented upfront is regularised without difficulty; the same project discovered afterwards is handled in conflict, and sometimes in demolition.

A unit converted without a word creates three problems at once: designated use, networks and charges.

Track requests with CoproHarmony

CoproHarmony records works projects, meeting decisions and before-and-after photos, unit by unit, so what was approved is retrievable years later. Create your free space.