If you are planning to build or renovate property in Mallorca, you will quickly encounter two key technical terms: Proyecto Básico and Proyecto de Ejecución.
For many international buyers, these stages are confusing — yet understanding the difference is critical for budgeting, timeline planning, and avoiding costly redesigns. This guide explains what each phase means, how they affect your investment, and why proper sequencing protects both capital and construction quality. Before continuing, we recommend reviewing our Cornerstone Guide to Planning & Building in Mallorca, which explains how planning law and municipal approvals shape every project.
What Is a Proyecto Básico?
The Proyecto Básico (Basic Project) is the document submitted to the Town Hall to obtain planning approval (licencia de obra).
It includes:
- General architectural concept
- Site plans and urban compliance
- Floor plans, sections and elevations
- Planning justification (PGOU or NNSS compliance)
- Surface calculations
- Basic construction description
The purpose of the Proyecto Básico is to prove that the design complies with municipal planning regulations. It is not detailed enough to build from.
Why This Matters to Foreign Buyers
Many buyers mistakenly assume that once planning approval is granted, construction can begin immediately.
However, approval is granted on the basis of the Proyecto Básico — not on detailed construction drawings.
This distinction directly affects cost certainty.
What Is a Proyecto de Ejecución?
The Proyecto de Ejecución (Execution Project) is the full technical documentation required to construct the building.
It includes:
- Detailed construction drawings
- Structural engineering calculations
- MEP (mechanical, electrical, plumbing) systems
- Technical specifications
- Material schedules
- Energy performance compliance
- Detailed budget measurements
The Proyecto de Ejecución transforms concept into buildable reality.
Without it, contractors cannot price accurately — and banks will not release self-build financing.
Key Differences at a Glance
| Aspect | Proyecto Básico | Proyecto de Ejecución |
|---|---|---|
| Purpose | Planning approval | Construction execution |
| Level of detail | Conceptual & regulatory | Fully technical & detailed |
| Required for license? | Yes | Usually submitted after approval |
| Accurate construction pricing? | No | Yes |
| Suitable for tendering? | Limited | Essential |
Understanding this difference is essential for realistic cost planning.
For deeper insight on budgeting phases, see our Cost Planning for Building in Mallorca article .
Timing: When Does Each Phase Happen?
Typical sequence:
- Feasibility study
- Proyecto Básico preparation (2–3 months)
- Municipal submission and approval (3–9 months)
- Proyecto de Ejecución development (2–4 months)
- Tendering and contractor appointment
- Construction begins
Some teams begin parts of the Execution Project while awaiting approval to save time — but this requires careful coordination.
Cost Implications for International Clients
Risk of Budget Shock
If you commit to construction costs based only on the Proyecto Básico, expect variations.
The detailed measurements and technical specifications in the Proyecto de Ejecución often refine:
- Structural complexity
- Insulation requirements
- MEP system specifications
- Finish selections
This can shift costs significantly.
Strategic Approach
A controlled development model includes:
- Early cost planning alongside design
- Construction input before finalising execution drawings
- Clear material specification strategy
This integrated approach reduces surprises during tendering.
Why Integration Between Design and Construction Matters
In Mallorca, many disputes arise because:
- Design is completed in isolation
- Construction pricing begins too late
- Technical details evolve during the build
When architecture and construction services operate collaboratively, the transition from Proyecto Básico to Proyecto de Ejecución becomes smoother and more predictable.
If you want to understand how integrated execution reduces risk, explore our Construction Services Overview .
Foreign Buyer FAQs
Can I build with only a Proyecto Básico?
No. Construction requires a completed and approved Proyecto de Ejecución.
Is the Execution Project mandatory for mortgage release?
In most self-build financing scenarios, banks require the detailed Execution Project and cost breakdown.
Can costs increase after the Básico stage?
Yes. The Básico stage does not contain sufficient technical detail for fixed pricing.
Practical Advice Before You Start
- Never rely on early estimates without Execution-level detail.
- Align design ambition with cost strategy early.
- Sequence planning and construction documentation intelligently.
- Work with professionals familiar with municipal processes in Mallorca.
Clarity at this stage prevents friction during construction.
Speak With a Project Specialist
If you are planning a new build, major renovation, or luxury villa in Mallorca and want clarity on:
- Design stages
- Cost evolution
- Planning approval
- Execution strategy
Contact us for a structured consultation before committing capital. Proper understanding of Proyecto Básico vs Proyecto de Ejecución is not technical bureaucracy — it is financial protection.
