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How much does it cost to legalize the plans of a house in CABA? - La Nacion Propiedades
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¿Cuánto cuesta legalizar los planos de una vivienda en CABA?
Toda obra de ampliación o modificación de una propiedad requiere la renovación de sus planos; en caso de no hacerlo, pueden pagarse multas por construcciones no declaradas
www.lanacion.com.ar
March 27, 2026
Any expansion or modification work on a property requires the renewal of its plans; failure to do so may result in fines for undeclared construction.
Applications for design and architecture. Shutterstock
Legalizing the plans of a house in the city of Buenos Aires is a procedure that appears with increasing frequency , especially when a property has extensions or modifications that were never declared .
The need often arises when selling, subdividing, or starting a renovation that requires the documentation to match the existing structure . In all cases, the process involves submitting updated plans and paying the corresponding fees for any work carried out without a permit.
According to architect and municipal procedures specialist Liliana Larrozza, legalizing a construction project "is, in practical terms, like submitting a final building permit, but with the added requirement of paying fees and fines for work built without a permit." This applies as long as there are no prior closures or warnings; in those cases, the procedure is different. When it comes to formal legalization, the owner must submit plans that reflect the actual state of the property and comply with the technical requirements established by the City.
When selling, subdividing or starting a renovation, it is required that the documentation matches what has been built. Shutterstock - Shutterstock
The process requires the involvement of a registered professional—an architect, civil engineer, or master builder, depending on the scope of work—who digitally signs the plans and professional commissions. This signature is not merely an administrative detail: it certifies the technical responsibility for the project and enables its submission to the municipal system.
In the case of housing, the City requires the submission of what is known as a "single plan ," a document that integrates architecture, structure, and installations into a single digital presentation. This includes surface area calculations, floor plans, plumbing, electrical, and fire safety schedules, and all necessary technical documentation. This unified format requires more preparation time, but it speeds up the review process: "It's reviewed by a single analyst, which makes approval more efficient," Larrozza points out.
The processing time is not immediate. Preliminary preparation of the single plan can take between 40 days and two months, provided the project designer has all the necessary documentation ready. Once the file is submitted to the TAD system, project approval typically takes between 60 and 90 days, and issuing the building permit requires at least an additional month. In total, the entire process takes between four and six months to obtain the registered project and the corresponding permit.
The cost of legalization depends on three factors:
- the rights to the work
- fines for building without a permit
- professional fees
Building permit fees are calculated based on the zone and the value per square meter. A fine proportional to the amount of unauthorized construction is added to this amount. If the expansion is permitted, the City charges the building permit fee plus an additional 250%. If it is not permitted, the fine can reach 500%. Larrozza illustrates this as follows: if a 20-square-meter expansion was added and the building permit fee is $1,000 per square meter, the owner will have to pay $3,500 per square meter if the expansion is permitted, or $6,000 if it is not.
Professional fees represent between 10% and 15% of the total value of the workShutterstock - Shutterstock
In addition to this, professional fees represent between 10% and 15% of the total project cost. Within that percentage, approximately 60% corresponds to the project and municipal permitting, and 40% to construction management. The specialist mentions that, for a house with modifications and expansions, the permitting process can cost between $2,500,000 and $3,000,000, depending on the complexity of the case. “If someone needs to legalize the plans because they are going to do a renovation and there are undeclared square meters, generally speaking, they should expect the fees to be around 10% of the project cost,” she summarizes.
Legalizing a property is not a minor procedure, but it is a necessary step to regularize its status and enable future operations, from renovations to subdivisions. In a city where informal additions are common, the process has become part of the routine for many homeowners seeking to bring into compliance what was once built without a permit.
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