An enclosed balcony is one more room

Yes, but only if the enclosure stays removable. Removable panoramic glazing falls under permit-free building work: it has to be completely transparent, fully openable and must not create a permanently enclosed space, so no new volume. In that case no building title is needed.

If instead you enclose the balcony with a fixed structure that is extra volume, and without paperwork it is an unlawful work. Watch out for two exceptions: properties in areas under landscape protection, where authorisation is needed regardless, and blocks of flats whose rules prohibit facade enclosures.

VEPA stands for removable panoramic glazing, it is the name the rules use. They are glass panes that slide on guides and gather all to one side: when you open them the balcony really is open, as it was before. That is why it is not counted as volume.

A veranda is a fixed enclosure, with frames and leaves that open like windows. It insulates far more and can be heated, but it turns the balcony into a room to all intents and purposes: building paperwork, land registry update and, where the local plan requires it, a check on the volume still available.

It varies too much case by case to give a number over the phone, and the item that weighs most is not the area: it is the type of enclosure. Removable glazing sits at one price level, an aluminium thermal-break veranda with double glazing at another, and between the two there is a significant distance.

Then there are the span to cover, the number of panes, the glass, the roof if the space is open and the state of the floor and the railing. When you compare two quotes, check that they state the type of glass, the thickness and the sliding system: very different products hide under the same word.

For a veranda aluminium is nearly always the right choice. It carries wide spans with slim profiles, so more light comes in, and it takes the weight of the glass without bowing. uPVC insulates very well but has thicker profiles and on large spans it needs reinforcement that steals glazed area.

uPVC is still excellent for house windows, where sizes are moderate and insulation is what counts. On balcony enclosures, where you go for large glazing, we work in aluminium.

A terrace is nearly always open, so on top of the sides there is the problem of the roof. A new, fixed roof is volume to all intents and purposes and has to be authorised: that is why enclosing a terrace is more demanding than enclosing a balcony that already has another balcony above it.

Then there is the waterproofing. Under the terrace paving runs the membrane that protects the room below, and anchoring a structure means drilling through it. It has to be done with the right seals, otherwise whoever lives below is the one who finds the leak.

It depends how it is built. If the porch is recessed within the outline of the building, that is, already under the building and not projecting, since 2024 the rule on removable glazing covers it: it can be enclosed with fully openable panes without a building title.

If instead it is a structure added in front of the house, enclosing it creates a new space and paperwork is needed. The difference lies in what the drawings filed with the council show, not in the appearance: that is why the first thing we ask for is the floor plan.

A bioclimatic pergola is a roof with adjustable louvres: it opens and closes overhead, shelters from sun and rain, but underneath the space stays outdoors and does not insulate. A veranda is enclosed on the sides too, so it is a proper room, with all the planning weight that carries.

They answer two different needs: the pergola lets you stay outside a few more months, the veranda gains you a room. We do glazed enclosures, aluminium verandas and awnings, not louvred roofs.

A canopy is roof only: a plane resting on posts, open on all sides. It shelters from rain and sun, but the space underneath stays outdoors. A veranda has walls as well, so it delimits an enclosed volume.

The distinction matters because planning law thinks exactly like that: as long as the space stays open it is assessed as covered area; the moment you enclose it, it becomes volume. That is the boundary that decides what paperwork you need.

There are three routes. Stacking glazing, panes with no vertical uprights that gather to one side: maximum transparency and full opening, but limited insulation, because the glass is single toughened or laminated and there is no cavity. Thermal-break aluminium sliding systems with double glazing, which really insulate and are what you need when the space has to be lived in through the winter too. Fabric or clear PVC blinds, which shelter from wind and sun but do not create an enclosed space.

The choice depends on how much time you want to spend in there in the cold months. If the aim is a warm room, removable glazing on its own is not enough.

If the work falls under permit-free building nobody stops you, but there are two things do-it-yourself nearly always gets wrong. The first is the glass: on a vertical enclosure, where a person can lean or fall against it, laminated safety glass has to be used, otherwise if it breaks the shards end up on somebody or in the street.

The second is the wind. An enclosed balcony becomes a sail: guides, anchors and thicknesses have to be sized for the load they take, and on the coast the load is serious. Add that on a self-installed job you have no warranty, and if something gives way the responsibility is yours.