Do I need an architect? Projects and the LOE roles
By Ross Alinari · Last checked · Editorial policy · How we check facts
The answer depends on the intervention, not simply on the owner’s preferred budget or the contractor’s description of the job. The Ley de Ordenación de la Edificación, or LOE, defines its scope and the responsibilities of the principal building agents. For residential work, a project and technical appointments can be necessary where the proposal crosses the thresholds in article 2. A construction quotation alone does not establish whether those thresholds are met.
Establish whether the intervention requires a project
The LOE includes new construction within its scope, subject to a limited exception for technically simple, minor, single-storey buildings that are neither residential nor public. For existing buildings, it covers total interventions and partial interventions producing an essential variation in overall external composition, volume or the structural system, or changing the building’s characteristic use. It also addresses interventions in protected buildings and protected parts.
An owner should therefore describe the proposed change before asking for a yes-or-no answer about an architect. An extra enclosed room, a substantially altered facade or a structural rearrangement needs assessment on its own facts. The statutory exception for certain simple buildings should not be read as a general exemption for small residential extensions. Obtain a written explanation of the project’s scope and the reason technical appointments are or are not required. Keep that explanation with the design brief, especially where the initial idea is likely to develop during estimating.
Understand the designer’s responsibility
The proyectista prepares the project under the applicable technical and planning rules. Article 10 identifies the relevant professional qualifications by building use; for the residential group identified in the law, the designer’s qualifying profession is architect. The provision also allows specialist parts of a project to be prepared by other competent technicians, with the necessary coordination.
Before commissioning design work, ask what the appointment includes: survey information, drawings, technical justification, coordination of specialist input and the documents required for the chosen submission. Distinguish an early feasibility sketch from the developed documents needed to define construction. A contractor may be able to comment on buildability, but that does not replace the designer’s legal role. Keep the scope of each appointment readable, with named functions rather than an assumption that one general project-management label covers every statutory responsibility. This site does not publish partner identities or professional registration details; appointments are matters for the actual project documents.
Separate direction of works from execution control
The director de obra directs the development of the works in their technical, aesthetic, planning and environmental aspects in accordance with the project, the licence and other authorisations and contractual conditions. The director de la ejecución de la obra directs material execution and controls the quality and quantity of construction in the terms of article 13. The law specifies the qualifying professions for these roles according to the building use and circumstances.
Ask how these functions are provided for in the appointments relevant to your proposal. A construction progress update is not the same document as a technical instruction or inspection record. For an owner abroad, that distinction prevents a photograph of completed work being mistaken for evidence that a technical stage has been accepted. Agree how instructions reach the contractor, how design queries are resolved and where records are stored. The site manager or owner’s contact can coordinate communication, but the legal functions should remain identifiable in the underlying documentation.
Define the owner and contractor obligations
The LOE describes the promoter as the person who decides, promotes, programmes and finances the building works, and sets out promoter obligations. It separately defines the constructor and responsibilities associated with executing the works according to the project, applicable legislation and instructions of the technical direction. An owner may therefore have responsibilities that are not removed by being resident in another country.
Prepare a responsibility schedule covering technical appointments, document provision, permissions, construction execution and handover. The schedule should follow the actual contracts rather than assigning everything to whoever is most frequently on site. If the owner changes a specification, establish who evaluates the technical effect before the contractor proceeds. Where additional specialists are needed, record their contribution and how it fits into the coordinated project. No universal fee percentage or staffing promise is supplied here: the appointments depend on the scope, and their terms need to be agreed explicitly before work relying on them begins.
Keep the project consistent as the design changes
Article 4 describes the project as the documents defining the technical requirements of the works. Article 12 includes functions relating to project modifications and final documentation within the works director’s responsibilities. A useful practical consequence is that revised construction instructions need to remain connected to the technical record, rather than existing only in a messaging thread.
Ask for revisions to be dated and identifiable. Record why a change was proposed, what it affects and whether further permission or technical justification is required. Compare the construction quotation with the same revision that the technician has assessed. If a drawing changes after the quotation, obtain a clear account of the resulting scope and price changes before acceptance. This is particularly valuable when several people communicate in different languages: an agreed drawing number and written decision are less ambiguous than separate recollections of a call. They also make completion documents easier to reconcile with the building actually delivered.
Plan the documents you will keep
The LOE addresses reception of the works and documentation of the completed building. Article 7 includes the project with approved modifications, the reception record, identification of building agents and use and maintenance instructions in the documentation passed to users. The exact package must correspond to the intervention and its legal scope.
Agree the handover requirements early enough for documents to be produced during the work. Keep technical records distinct from warranties for individual products and from the contractor’s commercial correspondence. An overseas owner should know which documents need retaining for future maintenance, a later alteration or a sale. Review missing items before treating the paperwork as complete, and make sure the final drawing set is recognisably the final version. These steps do not guarantee that every alteration needs the same technical team. They provide a way to define, appoint and document the roles required by the particular project without relying on an informal label such as full renovation.
Worked example
A villa owner proposes changing the external volume and rearranging structural openings. The initial assessment identifies whether the LOE project threshold is met, then defines the design and technical direction appointments. The contractor prices the resulting scope. When the owner later requests a different opening, the change returns to the designer and relevant direction before it becomes a construction instruction. This is a hypothetical workflow, not a description of a commissioned project.