Is a loggia the same as a balcony?

No. A balcony projects from the facade, usually on a cantilevered slab or brackets, while a loggia is recessed into the building and covered by the floor above. The recessed position gives better shelter from weather, but it moves the thermal problem into the floor and side walls.

Does a glazed loggia count as heated living space?

It depends on whether the space is heated and how it is insulated and separated from the flat. A glazed loggia that is unheated and uninsulated behaves differently from one that is part of the heated rooms. Confirm its status with your energy consultant before it is counted in any calculation.

Who must agree to glazing a loggia in a block of flats?

The facade is shared property, so the owners' association normally decides on changes to the front of the building. That decision is separate from the building authority's procedure, and it is the first step to clear. Get the association's answer in writing before the design is developed.

Does glazing a loggia always need a building permit?

No single rule applies. The procedure depends on the scope of the work, whether load-bearing parts are touched, and how the building authority classifies the change. Ask the local building office in writing before ordering any glazing.

Why do loggias in panel buildings often show damp or mould?

The joints between panels, the parapet and the junction with the floor slab are common routes for water and cold air. Without insulation at these edges, the inside surface runs cold and can develop condensation and mould. Check the joints and junctions before blaming the interior finish.

Loggia

A recessed balcony inside the building volume, covered from above and enclosed on three sides, whose floor and side walls interrupt the thermal envelope.

A loggia (lodžia) is an outdoor space recessed into the building volume rather than projecting from the facade. The slab above forms its ceiling, side walls enclose it, and only the front is open. That keeps rain and sun off the space from above, but it makes the junctions harder to detail than those of a balcony.

What is a loggia made of, and which parts matter for building physics?

The floor is the flat's slab carried out to the front edge. The side walls separate the loggia from the neighboring space and from the open facade. The parapet or balustrade closes the front, and the ceiling is the underside of the slab above. Each part is where structure, insulation and weather meet.

How is a loggia different from a balcony and a terrace?

A loggia and a balcony both give residents an outdoor space above ground, but they are built in opposite ways. A balcony projects out of the facade. A loggia is set back inside it. A terrace is a platform at ground or roof level and is not normally recessed into the building.

Feature	Loggia	Balcony	Terrace
Position	Recessed into the building volume	Projects beyond the facade	Ground level or on a roof
Support	Floor slab and building walls	Cantilevered slab, brackets or own columns	Ground base or roof build-up
Cover from above	Yes, from the slab above	Usually none	Usually none
Main thermal issue	Floor and side-wall junctions interrupt the envelope	Slab passing through the insulation	Roof build-up and edge details
Weather exposure	Sheltered overhead, open at the front	Exposed on several sides	Open to the sky

A balcony's problem is a projecting slab. A loggia's problem is a recessed floor and wall, so the insulation has to run past the floor and side walls without a break.

Why does a loggia create a thermal bridge?

Heat takes the easiest path out of a heated room, and in a loggia that path runs through the floor slab and the parapet, which form a continuous link to the outdoor air. The side walls and the wall between the loggia and the flat are the other places where the insulation can be interrupted.

Whether the loggia sits inside or outside the thermal envelope decides where that line runs. If the loggia stays open and unheated, the wall between it and the flat usually carries the insulation line. If it is treated as heated space, the outer edge becomes the boundary instead. The energy calculation has to follow the situation the building actually has.

The inside surface at each junction runs colder than the wall around it, so condensation, dark mould and frost damage tend to start in the corners where a side wall meets the ceiling or the floor, the same mechanism as any thermal bridge.

Which loggia junctions carry the most risk?

For each junction the questions are the same: is the insulation continuous, and is the joint sealed against water and air?

Junction	Typical risk	What to check
Floor slab edge	Heat and water path from the heated floor to the front	Thermal break or continuous insulation at the edge
Side wall to flat	Insulation line interrupted where the wall meets the floor	Insulation on the loggia side and continuity at the corner
Parapet base	Water entry under the parapet and a cold edge	Waterproofing, drainage and a sealed base
Ceiling (underside of the slab above)	Cold surface where the slab is not insulated	Insulation on the soffit or a continuous insulation line
Door or window to the loggia	Air leakage and a cold reveal	Frame sealing and threshold detail

Why do loggias cause recurring problems in Slovak panel blocks?

Many Slovak residential blocks built in the panel system have loggias. A panelák is assembled from factory-made concrete elements, so the loggia parapet, side walls and floor meet the rest of the building at joints. Those joints are where sealant ages first and where water and cold air find a path. Where a loggia was left open, driving rain reaches the back wall and the floor, and frost acts on any surface that holds water. A later glazing job has to bond to these old joints, so their condition should be checked first.

What changes when a loggia is glazed in?

Glazing a loggia, called zasklenie lodžie in Slovak, moves the boundary of the flat from the loggia front to a new glazing line. The glazed space then works as a buffer against wind, noise and driving rain. Whether that is a gain or a loss depends on whether the space is heated, how well the frames are sealed, and whether the floor and side walls are insulated.

Aspect	Open loggia	Glazed-in loggia
Boundary of the heated space	The wall between the loggia and the flat, if the loggia is unheated	The new glazing line, if the glazed space is heated
Main moisture risk	Rain on the floor and back wall	Condensation on the cold inside faces of the glass and side walls
Ventilation	Natural, through the open front	Needs a plan, or moisture from the flat collects on the glass
Airtightness	Not a design focus for the loggia itself	The glazing line must be sealed at every junction

Who has to approve glazing a loggia in a flat?

In a block of flats the facade and the structure belong to the owners together. A change to the front of the building therefore normally needs a decision of the owners' association (spoločenstvo vlastníkov), separate from any approval by the building authority. Treat that decision as the first step and get it in writing.

Does glazing a loggia need a building notification or a permit?

There is no single answer, and this article does not give one. The procedure depends on the scope of the work, whether any load-bearing element is touched, whether the outer look of the building changes, and how the building authority classifies the job. A glazed loggia is more likely to be assessed as an alteration of an existing building than as a minor structure (drobná stavba), so the route to check first is the structural alteration notification, though a full permit procedure remains possible. Ask the building office in writing before ordering glazing.

What should you check before glazing a loggia?

Before any design work starts, check the following.

The owners' association decision, in writing.
Whether the loggia floor and side walls are load-bearing and what they can carry, confirmed by a structural engineer.
The condition of the floor waterproofing, the drainage and the parapet base.
Whether the new glazing line can be insulated and sealed at the slab and wall junctions.
A ventilation plan for the glazed space.
A written answer from the building office on which procedure applies.

Frequently asked questions

Is a loggia the same as a balcony?: No. A balcony projects from the facade, usually on a cantilevered slab or brackets, while a loggia is recessed into the building and covered by the floor above. The recessed position gives better shelter from weather, but it moves the thermal problem into the floor and side walls.
Does a glazed loggia count as heated living space?: It depends on whether the space is heated and how it is insulated and separated from the flat. A glazed loggia that is unheated and uninsulated behaves differently from one that is part of the heated rooms. Confirm its status with your energy consultant before it is counted in any calculation.
Who must agree to glazing a loggia in a block of flats?: The facade is shared property, so the owners' association normally decides on changes to the front of the building. That decision is separate from the building authority's procedure, and it is the first step to clear. Get the association's answer in writing before the design is developed.
Does glazing a loggia always need a building permit?: No single rule applies. The procedure depends on the scope of the work, whether load-bearing parts are touched, and how the building authority classifies the change. Ask the local building office in writing before ordering any glazing.
Why do loggias in panel buildings often show damp or mould?: The joints between panels, the parapet and the junction with the floor slab are common routes for water and cold air. Without insulation at these edges, the inside surface runs cold and can develop condensation and mould. Check the joints and junctions before blaming the interior finish.