Start before you buy
The most expensive renovation mistakes are made before the deposit is paid. A buyer who plans to add a floor, a pool or a guest room should find out first whether the planning rules allow it. In Mallorca that depends on the town hall’s general plan, the island plan of the Consell de Mallorca (the island council) and, on country land, the Balearic rustic land rules.
- Ask the town hall for a planning certificate, or have an architect check the plan for the plot.
- Check whether the building is listed or appears in a heritage catalogue.
- Compare what is built with the licences on file. Rooms or terraces added without a licence limit what you can do later.
- On rustic land, confirm the land category and the plot size.
Our guides to surveys and checks and buying a finca explain these checks in detail.
Two kinds of permission
The Balearic planning law (Law 12/2017, known as the LUIB) sets out two routes. Which one applies depends on whether the works need a technical project under the national building law.
- Comunicación previa
- A prior notice to the town hall, used for simple, small-scale works that need no technical project, such as some interior refurbishments. For these, works can start the day after the notice is filed. The notice must set a time limit for the works of no more than two years.
- Licencia de obras
- The building licence. It is needed for new buildings, works on existing buildings that require a technical project, demolitions, changes of use and opening tracks, among other things.
The Consell de Mallorca can widen the list of works that only need a notice, but the law never allows the simpler route for works on protected rustic land or on listed or catalogued buildings, nor for works that affect the foundations or structure, change the volume or the number of homes, or involve demolition. Town halls set the paperwork in local ordinances, so check the rules in your municipality.
Old houses on rustic land
Country houses are where most renovation plans meet limits. The island plan only lets town halls allow reform and extension of genuine traditional houses of at least 35 m² of usable space, built with authorisation or before the 1956 Land Law. A legal house on a plot smaller than today’s minimum cannot be extended at all. Works that amount to rebuilding the main structure are not allowed, apart from partial work on roofs or floors.
- Living, cooking and sleeping rooms must stay in one building; a separate guest house is generally not allowed.
- One pool per finca, with no more than 35 m² of water surface and 60 m³ of volume.
- A full renovation needs a project for the whole finca: dry-stone walls, terraces, fire safety and lighting.
- Unlicensed parts that can no longer be demolished can only be repaired, not improved.
Owners with old unlicensed buildings may be able to use the 2024 extraordinary legalisation, open in Mallorca until February 2028. Buying a finca explains how it works and its limits.
The order of work
Survey and measured drawings
An architect or technical architect (arquitecto técnico) surveys the house and records what exists and what is legal.
Basic project and application
The architect prepares a basic project, which is enough to apply for the licence, and files it with the town hall with any reports the law requires.
Licence
The town hall must give its decision within three months of receiving a complete file. Heritage authorisations and Consell reports for rustic land can add time.
Execution project
If the licence was granted on a basic project, the detailed execution project must be filed within nine months, and building cannot start without it.
Start notice and site board
The town hall must be told at least ten days before work begins, and a board showing the licence must stay on site.
Building
An architect directs the works, usually with a technical architect supervising construction. Temporary electricity and water can be contracted on the strength of the licence.
Completion
The technicians certify the end of the works. New or altered buildings may need an occupancy licence or habitability certificate, and new or enlarged buildings should be declared at the notary and in the Land Registry.
Timing and deadlines
A building licence sets a period to start and a period to finish. If the general plan says nothing, the law gives six months to start and three years to finish. The owner can obtain one extension of each, for half the original period, by asking in time with a reason. A second extension to finish is possible once at least half the building work is done and the facades and roof are complete. If the deadlines pass, the licence lapses and a new one is needed under the rules then in force.
Budget for the municipal construction tax (ICIO) and the licence fee, which are paid to the town hall, as well as the professionals’ fees. See choosing a lawyer for how your lawyer and architect can work together.
Sources
Facts in this post were checked in October 2026 against these sources.
- boe.es/buscar/act.php?id=BOE-A-2018-806 LUIB: acts subject to licence (art. 146); works subject to prior notice, island councils’ power to extend the list and the acts that can never use it (art. 148); notice procedure, start the next day and two-year limit (art. 153); three-month decision period and ten days’ notice before starting (art. 151); basic and execution project, nine months to file the execution project (art. 152); start and finish periods, extensions and lapse (art. 154); site board (art. 157); temporary utility contracts with the licence (art. 158); limits on buildings outside planning (art. 129); one pool per finca of up to 35 m² and 60 m³ on rustic land (art. 68 bis)
- boe.es/buscar/act.php?id=BOE-A-1999-2945 Balearic Heritage Law 12/1998: prior authorisation of the island heritage commission before the municipal licence for works on monuments and their surroundings (art. 37) and for works on listed or catalogued buildings (art. 40)
- conselldemallorca.es/media/planificacioterritorial/20230717_Text_conso Island plan rules on reform and extension of traditional houses of at least 35 m² built with authorisation or before 1956 (Norma 28); rooms in a single building (Norma 20)
- boe.es/buscar/act.php?id=BOE-A-1997-18197 No extension of legal houses on plots below the current minimum (Law 6/1997, second transitional provision)
- boe.es/buscar/act.php?id=BOE-A-2020-8012 Landscape and environmental project for the whole finca for new buildings and full renovations (Decree-law 9/2020, art. 6)
- boe.es/buscar/act.php?id=BOE-A-2025-720 Law 7/2024: extraordinary legalisation on rustic land (additional provision 7)
- intranet.caib.es/eboibfront/pdf/es/2025/21/1183010 Consell de Mallorca agreement applying the legalisation, with a three-year window from 15 February 2025
- boe.es/buscar/act.php?id=BOE-A-1999-21567 Building Act (Ley 38/1999): which works need a technical project; roles of the works director and the director of execution
- boe.es/buscar/act.php?id=BOE-A-2004-4214 Municipal construction tax (ICIO) on works that need a licence or notice (arts. 100 to 103)
