The storeroom that became a bedroom: converting a basement, pilotis, attic or veranda into living space in Greece

The most common surprise in a Cretan house survey is not a crack; it is a room: a storeroom with a bed in it, a basement flat, a walled-in pilotis, a glazed veranda. Each is a change of use, and unless permitted, an unauthorised one that must be settled before a sale. Most can be settled for a fine if they existed by 28 July 2011; later ones mostly cannot. As checked in November 2026 against the Spatial Planning and Urban Planning Code (law 5306/2026), its July 2026 amendment, the ENFIA law, AADE and a 2025 Council of State ruling.

I am not a lawyer or an engineer, and this is not legal or engineering advice. Whether a particular space can become a room, and which category a past conversion falls in, is a question for an engineer who has measured it and read the permit.

Main use, auxiliary use, and why the label matters

Article 197 of the code defines main-use spaces as those where people live and work, with a clear height of at least 2.50 metres in buildings after 4 July 2012; auxiliary spaces are the corridors, bathrooms, storerooms, plant rooms and parking. A basement’s ceiling is no more than 1.20 metres above the finished ground, and a semi-open space (ημιυπαίθριος) is covered, unheated and open on at least 35% of its perimeter.

Main floor area is what the plot’s building coefficient limits, explained in building terms, so a storeroom that becomes a bedroom uses up coefficient that may not exist. An engineer quoted in March 2026 described a pre-2011 basement flat as settled exactly that way, as an excess of the coefficient, and a habitable room as needing about 2.50 metres of clear height, natural light and ventilation.

A lawful change of use

Article 366 is short: any change of use without the required building permit is unauthorised. Article 199 sets the lawful route. A change is possible only where the planning rules allow the new use; where it affects the structure, the services or the building diagram, it needs a building permit and an update of the Electronic Building Identity, and otherwise the identity update alone. The July 2026 amendment (law 5322/2026, article 56) added a one-off route outside town plans: a lawful building may be converted to housing once, within its existing shell, with no added floor area; buildings carrying granted deviations also pay 5% of the land’s objective value. Homes created by the new routes may not be let short-term for at least five years.

If the plot’s coefficient is used up, a lawful conversion may simply be impossible; get that in writing.

The conversion that already happened: settlement

Article 383 covers works and changes of use completed by 28 July 2011, outside the zones that can never be settled, set out in illegal constructions. Changes of use before 1975 in mainly residential buildings fall in category 1, on a €250 fee with no fine. In town plans, a change to a use the area permits is category 4, exempt from demolition once declared and the fine paid. Unauthorised semi-open spaces outside town plans are category 4 if they exceed coverage and building coefficient by no more than 60% and do not push more than 20 centimetres into the front garden. Everything else is category 5: a 30-year suspension of demolition, not legality, and new declarations closed on 30 September 2020 except special cases such as inheritance or auction, most of which ran out on 31 December 2025.

Applications for categories 1–4 are accepted until 31 March 2028 under article 389; under article 386 the file includes the latest E9 and aerial photographs or public documents dating the work and the use. The 2010 scheme for semi-open, basement and ground-floor spaces turned into main use within a permit’s volume survives in article 439: kept for 40 years on a special fine. A conversion made after 28 July 2011 faces demolition, an erection fine, a yearly maintenance fine and criminal sanctions (article 381). For an old village house, what predates 1955 is a separate question, answered in pre-1955 houses.

ENFIA, the E9 and the deed

ENFIA taxes auxiliary spaces at a coefficient of 0.1 under article 4 of law 4223/2013, so a storeroom used as a bedroom but declared as a storeroom pays a tenth of what a room would; the arithmetic is in how ENFIA is calculated. An E9 is due for any change in a property by 31 January of the following year, under article 23 of law 3427/2005 as amended in 2024. A 2020 press report, citing a newspaper, said owners who legalised such spaces would be asked for ENFIA on the extra square metres for up to five past years; spaces kept under article 439 owe no retroactive tax. Agree in the contract who bears any past years.

The deed and the Cadastre will still say “storeroom”. In a block, changing that amends the deed of establishment: unilateral only in the cases article 385 lists, otherwise needing more than half the co-owners.

The sale, and the apartment block

Under article 367 a transfer of a property with unauthorised works or uses is void unless an exception applies. A completed settlement, or 30% of the fine paid, is one. Article 366’s other “planning violations” are exempt too, except the ones that matter here, including the change of a main use and the underground auxiliary-to-main conversion. The engineer’s certificate under article 368 must state that no use operates without a permit, or that any that does falls under an exception. Agree in writing who pays the settlement before the deposit.

In a block, two more filters apply. Article 385 lets a co-owner in a town plan settle works and changes of use inside their own flat regardless of the others’ consent, but common parts are different: in decision 1616/2025 the Council of State plenary held that, without a regulation, a majority cannot settle works on common parts, such as a walled-in pilotis, over other co-owners’ objections, and that disputes over those rights belong to the civil courts. And settling with the state does not rewrite the building regulation: if it limits a storeroom to storage, the neighbours can still enforce it. How regulations bind is in common charges and building rules, and why a converted basement is not a legal short let in renting out your Crete home.

The honest downside

The extra room often makes the price look reasonable, and has the least legal standing. A conversion after mid-2011 cannot be settled; a category 5 one buys thirty years, not the use; a settled room may sit on coefficient the plot never had. The tax catches up, the deed still says storeroom, and in a block the neighbours and the regulation keep their say. Pay for the room the permit shows.