This is one of the most common sources of confusion for foreign buyers and property owners in Spain. The Spanish professional landscape around renovation and construction uses terms that overlap in ways that are not always clear, and the legal requirements for different project types are specific in ways that are not obvious from outside the system.
The Architect in Spain: A Legal Role, Not Just a Service
In Spain, an arquitecto is a protected professional title. Only people who hold a degree in architecture, have completed their official registration process, and are licensed members of their regional Colegio de Arquitectos can legally use the title and practice as architects.
More importantly for renovation clients: certain types of construction work in Spain legally require a licensed architect to prepare and stamp the technical project. Any Obra Mayor project, meaning any project that involves structural work, changes to the building envelope, changes to the building’s layout or use, or any project above a certain scale threshold, requires an architect-stamped project before a building permit can be granted. Our guide to Madrid building permits and licencia de obras explains in full which projects fall into which permit category.
This is not optional. A project that legally requires an architect’s involvement cannot proceed to permit without one, regardless of how capable the contractor or interior designer is.
The architect is also the legally responsible professional for the design and for the dirección facultativa (construction supervision) on permitted projects. This legal responsibility is one of the reasons Spanish architecture fees exist at the levels they do.
The Interior Designer in Spain: No Protected Title, Variable Capabilities
In Spain, the title “interior designer” (interiorista) is not legally protected in the same way that “architect” is. Anyone can use it.
This does not mean that interior designers are unqualified. Many Spanish interioristas have excellent design training (typically at Escuelas Superiores de Diseño or equivalent institutions) and produce outstanding work. But their professional scope is different from an architect’s.
An interior designer in Spain can: design interior layouts, specify materials and finishes, coordinate furniture and decorative elements, manage cosmetic renovation projects that do not require Obra Mayor permits, and work as the design lead on the aesthetic aspects of a project.
An interior designer cannot: stamp technical projects for permit applications, take legal responsibility for structural elements, sign the dirección facultativa documentation for a permitted project, or legally supervise construction of works that require official architectural supervision.
For a renovation project that requires any permits beyond a simple Obra Menor, you need an architect, not just an interior designer. For a project that is purely cosmetic with no permit requirement, an interior designer may be entirely sufficient. The two professionals also work together well on larger projects: the architect handles the technical, structural, and legal dimensions while the interior designer leads the aesthetic and specification work. See how working with an architect in Spain unfolds in practice from first consultation to project delivery.
The Project Manager in Spain: Coordination Without Design
A project manager (gerente de proyectos or director de obras) in a residential renovation context coordinates the execution of a project. They manage contractor relationships, monitor schedules, track budget, and ensure that what was designed is being built.
In Spain’s residential renovation market, true independent project management is not common. The supervision role is typically either performed by the architect (as part of the dirección facultativa) or informally by the client.
For international clients managing projects remotely, the supervision quality of the architect they engage is effectively the project management function. This is why asking specifically about supervision frequency and reporting is important when selecting an architect. Our guide on finding and managing a contractor in Spain covers the contractor side of this relationship in detail.
When You Need an Architect, and When You Might Not
You need a licensed architect in Spain when:
The project requires an Obra Mayor permit (structural work, layout changes, extensions, changes to façade or building systems).
The project involves a heritage-protected building, which requires architect-stamped documentation regardless of scale.
You want legal protection during the construction phase (dirección facultativa from an architect provides a formal mechanism for certifying the quality of construction).
You may not need a licensed architect when:
The renovation is purely cosmetic (new tiles, new kitchen fronts, new lighting, new paint) with no structural or systems changes, no permit beyond a simple Obra Menor.
An interior designer can handle the aesthetic design coordination.
A capable contractor with clear technical specifications can execute without formal architectural supervision.
The decision is not always binary. For larger or more complex renovation projects, the combination of architect-led technical design and interior designer-led aesthetic direction often produces the best overall outcome.
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