Regulation Guide · 2026. 07
Balcony, Veranda, Terrace —
What You Call It vs. What the Law Calls It
LEA Architects · Junsu Kim, Architect
Where Everyday Language and Legal Language Diverge
"I extended my veranda" — in most cases, what people actually mean is a balcony extension. Everyday speech blends the terms, but in law, the three are entirely different spaces, and which one it legally is determines whether extension is even possible. Balcony extension has a lawful path; veranda extension is itself unauthorized construction.
How Balcony Extension Became 'Legal'
Balcony extension wasn't always lawful. Standards refined around 2005 opened a path to extend into living space once safety conditions — securing a refuge space, installing fire-rated panels (or glass) — are met. That standard is now the basis for extension construction, managed for multi-unit housing through an activity permit.
You can see the practical procedure and timeline directly in our recent Giheung-gu balcony extension activity-permit case. Keeping the permit from delaying the interior schedule is the key, and a design-oriented take on balcony use can be seen in our Balcony House project.
Be Careful of the Veranda Temptation
The trouble is always the veranda. That lower-floor roof space looks like "unused land in front of my home," tempting an owner to install windows — but the moment they do, it's unauthorized extension. Once registered as an unauthorized structure, enforcement penalties recur repeatedly and sale becomes complicated. When buying a house that's already been extended, checking the unauthorized-structure marking on the building ledger is the first step.
Frequently Asked Questions
Q. What's the difference between a balcony and a veranda?
A balcony is a legally defined add-on space with an extension system. A veranda is a colloquial term for a lower-floor roof; enclosing it is unauthorized extension.
Q. Does a balcony count toward floor area?
Up to 1.5m from the wall centerline is excluded; the excess counts. Balcony depth is typically designed around 1.5m for this reason.
Q. How does apartment balcony extension get processed?
Multi-unit housing needs an activity permit — refuge space and fire-rated panel/glass standards must be met, approved by the local government before construction. Unpermitted extension is subject to restoration.