Direct answer: before signing a CPCV (Contrato-Promessa de Compra e Venda — promissory purchase contract) on any plot in the Algarve, require a recent certidão de teor (land registry certificate), consult the PDM (Plano Diretor Municipal — municipal master plan) in force for the plot and — always — request a PIP (Pedido de Informação Prévia — prior information request) from the municipal council to obtain in writing the building index, maximum height and permitted uses. An urban plot of 500 to 800 m² for a T3 Passive House costs €40,000 inland (Alte, Salir), €150,000 to €350,000 in typical coastal areas (Quarteira, Ferragudo, Lagoa) and exceeds €400,000 in Vale do Lobo, Quinta do Lago or Vilamoura.
Buying land is the most important — and most irreversible — decision in any new-home project. A misreading of the PDM or an undetected easement can make the project unworkable or add 20-40% to the works cost. This guide sets out the documents, timelines and technical criteria that a Passive House requires from an Algarve plot.
Types of land: urban, urbanised, rural
Land classification determines what you can build. The three practical categories relevant to housing:
- Urban land: in an Urbanisation Plan or PDM classified as urbanised or urbanisable. Allows housing with defined indices, height limits, minimum areas and setbacks. This is the normal route for building a single-family home.
- Low-density urban land: transitional areas, with reduced indices (0.2 to 0.4 m²/m²). Allows detached houses with smaller footprint. Common in Silves, rural Loulé and São Brás.
- Rural land with conditional buildability: allows housing linked to agricultural or livestock activity, with a minimum area of 10,000 m² (1 ha), larger setbacks and obligation to maintain a primary rural use. A more restrictive regime, with mandatory PIP.
- Non-buildable rural land: in agricultural, ecological or forest reserve, or protected area (Parque Natural do Sudoeste Alentejano e Costa Vicentina, Ria Formosa). New housing essentially unfeasible.
PDM: how to consult and read it
The PDM (municipal master plan) defines what can be built on each parcel. All Algarve councils publish their PDM on online GIS (Geographic Information System) platforms. The practical process:
- Access the council's GIS portal (Loulé, Faro, Portimão, Silves, Albufeira, Lagoa, Lagos, Tavira, Vila do Bispo, Aljezur, Monchique, Castro Marim, Vila Real de Santo António, São Brás de Alportel, Olhão, Alcoutim).
- Enter the property's tax reference (matriz) or navigate the map to the plot.
- Check the zoning map (soil class, space category).
- Check the constraints map (National Ecological Reserve, National Agricultural Reserve, easements, watercourses, high-voltage lines, ecological corridors).
- Cross-reference with the regulation in force to find applicable indices and setbacks.
If the GIS reading leaves doubts — it usually does — file a formal urban information request with the council (free or €30-50, reply in 10-20 days) or go directly to a PIP.
Urban feasibility: the PIP
The PIP (Pedido de Informação Prévia — prior information request) is the legal instrument to obtain from the council, in writing and with binding value, the answer to two questions: "Can I build X on Y?" and "What conditions apply?" It costs €250 to €500 depending on the council and complexity, and the result is a binding decision valid for one year (renewable).
The PIP is not mandatory before purchase, but it is the only document that gives legal certainty as to the plot's buildability. The alternative (accepting the seller's word or GIS indications) is a gamble carrying the risk of losing the plot entirely if an easement appears or the index turns out lower than expected.
When you make an offer with a CPCV, include a free-termination clause if the PIP is negative — every serious seller accepts this.
Land registry certificate and property record
Before the CPCV, require from the seller:
- Certidão de teor from the land registry (Conservatória) — shows owners, mortgages, seizures, registered easements, registered area. Issued in 24-72h, costs €20-30.
- Up-to-date caderneta predial (tax authority property record) — patrimonial value, tax reference (matriz), boundaries. Issued via the Portal das Finanças.
- Council certificate confirming urban classification and the absence of pending urban planning procedures (subdivision, PDM, previous PIPs).
- Seller's tax identification document.
If the seller fails to provide or delays these documents, it is a red flag. Certificates take 24-72h to obtain and are the seller's responsibility.
Minimum area and maximum height
Each council defines minimum plot areas and maximum heights for single-family housing. Values typically applied in current urban zones in the Algarve:
| Council | Minimum plot area | Maximum height | Building index |
|---|---|---|---|
| Loulé (current urban) | 400-500 m² | 2 storeys (6.5 m) | 0.4-0.6 m²/m² |
| Silves | 500-700 m² | 2 storeys (7 m) | 0.3-0.5 m²/m² |
| Albufeira | 350-500 m² | 2-3 storeys (9.5 m) | 0.5-0.8 m²/m² |
| Faro | 400-600 m² | 2 storeys (7 m) | 0.4-0.7 m²/m² |
| Portimão | 350-500 m² | 2-3 storeys (9 m) | 0.4-0.7 m²/m² |
| Lagoa | 500-800 m² | 2 storeys (6.5 m) | 0.3-0.5 m²/m² |
| Lagos | 500-1,000 m² | 2 storeys (7 m) | 0.3-0.5 m²/m² |
| Tavira | 500-800 m² | 2 storeys (6.5 m) | 0.3-0.4 m²/m² |
| São Brás de Alportel | 700-1,000 m² | 2 storeys (7 m) | 0.2-0.4 m²/m² |
These figures are generic references for current urban zones. Each plot has its own regime according to operational unit and space category in the PDM. Always confirm by PIP.
Setbacks and easements
In addition to setbacks from plot boundaries (typically 3 m front, 3-5 m rear, 1.5 m sides), there are easements that reduce buildable area:
- Watercourses: 10 m protection strip on permanent watercourses, 5 m on seasonal ones.
- High and medium voltage lines: 20-40 m strip depending on voltage.
- Gas pipeline: 20 m strip centred on the axis.
- National and municipal roads: 30 m from the axis (EN), 15 m (EM), no construction without Infraestruturas de Portugal approval.
- Public hydraulic domain: 30 m from the mean waterline of the sea in non-urban areas.
- Classified ruins or archaeological finds: 50 m or specific perimetre.
Topographic and geotechnical survey
Before deed, two technical surveys avoid surprises:
- Topographic survey (€400-800): confirms real plot boundaries, elevation levels, existence of watercourses, neighbouring walls and gradient. Compared against the land register.
- Geotechnical survey (€800-1,500): boreholes to the expected foundation depth, analysis of soil compressibility and strength, presence of the water table. A foundation on soft soil requires larger footings or piles — this can add €5,000-25,000 to the works.
Both can be done after the CPCV and before the deed, with a termination clause if the result is adverse. It is common practice and reasonable sellers accept it.
Solar orientation and Passive House
In a Passive House, plot orientation is decisive. The ideal for the Algarve:
- Main façade facing south (controlled winter solar gains, summer shading).
- Northwest and northeast façades: reduced glazing, reinforced insulation.
- West façade to be avoided as the main one (late-summer overheating).
- Plot with good easterly exposure for photovoltaic and thermal solar collectors.
- No tall obstacles to the south (neighbouring buildings, hills) up to 60° elevation.
A plot with the wrong orientation forces expensive compensations (more insulation, electromechanical shading, reinforced ventilation). A well-oriented plot can reduce heat-pump and photovoltaic costs by 15-25%.
Public utilities: electricity, water, sewerage
The distance to public networks directly affects the budget:
- Electricity: up to 50 m from the overhead LV network is usually included. Beyond that, an extension request to E-REDES costs €40-120/m + administrative fee.
- Water: household connection up to 30 m is standard. Beyond that, additional cost coordinated with Águas do Algarve or municipal services.
- Sewerage: connection to the public network is preferable. Without a network, biological septic tank with soakaway (€2,500-5,000) or compact treatment plant (€7,000-12,000) depending on soil percolation.
- Telecommunications: fibre optic across almost all urban Algarve. Interior may require satellite or 5G fixed solutions.
Indicative prices by council in 2026
| Zone | 500-800 m² urban plot | 1,000-1,500 m² plot |
|---|---|---|
| Alte, Salir, Alcoutim (interior) | €25,000-70,000 | €40,000-100,000 |
| São Brás de Alportel, rural Loulé | €60,000-140,000 | €100,000-220,000 |
| Silves, Algoz, Messines | €70,000-160,000 | €110,000-250,000 |
| Tavira, Olhão, Faro periphery | €110,000-220,000 | €180,000-380,000 |
| Quarteira, inland Almancil | €150,000-320,000 | €250,000-500,000 |
| Lagoa, Ferragudo, Carvoeiro | €140,000-300,000 | €230,000-480,000 |
| Portimão, Alvor, Lagos | €150,000-320,000 | €260,000-520,000 |
| Vilamoura, Vale do Lobo, Quinta do Lago | €350,000-800,000+ | €500,000-1,500,000+ |
Values from 2025-2026 market prospecting, for plots with demonstrated building feasibility. They vary with views, gradient, exposure and proximity to services.
Signs of a problem plot
- Traces of surface runoff or erosion (heavy-rain marks).
- Natural gradient above 15% across the entire surface (high retaining-wall cost).
- Presence of protected native trees (cork oak and holm oak — felling banned without ICNF authorisation).
- Soil with visible clay or depressions (expensive foundations).
- No legally recognised road access (right of way by deed).
- Plot with old dry-stone retaining walls in poor condition (may collapse — owner's liability).
- Presence of ruins or old foundations (may carry heritage value and restrict demolition).
- Proximity to livestock farming or industrial area (odours, noise, market value).
12-point checklist before signing
- Recent certidão de teor (last 30 days).
- Up-to-date caderneta predial.
- Favourable PIP or CPCV clause with termination for negative PIP.
- Completed PDM GIS consultation.
- Confirmation of soil class and space category.
- Independent topographic survey.
- Geotechnical survey (if sloping or clay area).
- Verification of easements (watercourses, high-voltage lines, gas pipeline).
- Distance to public utilities measured and budgeted.
- Solar orientation validated (south façade clear).
- Legal road access confirmed.
- CPCV clauses with deed timelines and termination.
"A plot is an investment thesis with many hidden variables. The PIP and the topographic survey are the cheapest cost to make every variable visible."
Conclusion
Buying land in the Algarve requires three key documents: certidão de teor, PDM consultation and a favourable PIP from the council. Skipping any of them creates legal and financial risk disproportionate to the low cost of obtaining them (less than €1,000 in total). Plot choice determines 60-80% of the final quality of the Passive House project: a good plot with poor orientation cancels out the design; a small plot with good orientation can fit an exemplary T3.
Market values and legal requirements are 2026 estimates and vary by council, PDM operational unit and prevailing conditions. Always consult a qualified professional before deciding.
→ Ask us for a feasibility analysis of your plot (48h) or see the step-by-step process page to understand the link with the Passive House design.