Direct answer: a turnkey Passive House modular home and an apartment in Portugal serve different profiles. At equal usable area, a T3 180 m² modular house with a mid-range plot in Portugal costs approximately €370,000-500,000 in total (€320k construction + €50-180k plot), with guaranteed Class A and zero service charges. An equivalent T3 180 m² apartment in an urban zone costs €300,000-700,000 depending on the city, with typical Class B/C, service charges of €60-250/month and resale value depending on the area. This article compares the two paths across 12 objective dimensions for anyone deciding.
House or apartment is the most frequent property decision in Portugal. Many buyers decide by "I always wanted a house" or "an apartment is more practical" without analysing the objective dimensions that separate the two paths. This article presents the honest technical comparison — no bias — across 12 quantifiable points.
For the young first-home framework (specific tax benefits), see modular house as young first home. For the full modular house process, see 10 steps to build.
Comparison across 12 dimensions (summary)
| Dimension | Modular house | Apartment |
|---|---|---|
| Purchase price (T3 ~180 m²) | €370,000-500,000 (w/ plot) | €300,000-700,000 (variable) |
| Purchase price per m² usable | €2,055-2,780/m² | €1,667-3,890/m² (zone) |
| Own plot | Yes | No (autonomous fraction) |
| Typical energy class | Class A guaranteed by contract | B to A (variable, rare A+) |
| Monthly service charge | €0 | €60-250/month (avg €110) |
| Annual IMI | 0.3-0.45% VPT | 0.3-0.45% VPT |
| 30-year mortgage instalment (APR 3.8%) | ~€1,650/month (90% LTV) | ~€1,390/month (90% LTV) |
| Climate control cost | €35-70/month | €80-150/month |
| Garden/private outdoor area | Yes (whole plot) | Limited balcony |
| Flexibility (extension, pool) | High | Low (building rules) |
| Resale value at 20 years | Correlated with zone + envelope | Depends on zone + general condition |
| Mobility (ease of resale) | Medium-high (depends on zone) | High in city |
The detail of each dimension is developed below.
Price: a modular house is cheaper per €/m² than an urban apartment
At equal usable area, a turnkey Class A modular house has a price per square metre typically lower than an apartment in urban zones (big cities and surroundings):
- T3 180 m² Passive House modular: construction €1,750/m² × 180 = €315,000 + plot €60,000-180,000 = €375,000-495,000 total.
- New T3 apartment 180 m² in a prime area: €2,500-4,500/m² × 180 = €450,000-810,000.
- T3 apartment in a popular area: €1,600-2,200/m² × 180 = €288,000-396,000.
A modular house is economically advantageous against an apartment in a prime area; it is equivalent or slightly more expensive against an apartment in a popular area. The choice depends on the zone and type of use.
Service charges: the invisible €60,000 difference over 25 years
The cost most frequently underestimated in the comparison is the service charge (condomínio). In a typical apartment in Portugal, it ranges from:
- Small building without lift: €30-60/month
- Medium building with lift: €60-120/month
- Building with pool/common garden: €90-200/month
- Premium development (Vale do Lobo, 5 stars): €200-500/month
Realistic average: €90-130/month. Over 25 years of occupation, this represents €27,000-39,000 in expenses that are not capitalised. A modular house has zero service charges — maintenance paid directly as needed (typically €500-1,500/year on roof, paint, garden).
Impact on total cost of ownership (TCO) over 25 years:
- Modular house: acquisition + 25 years of maintenance ≈ acquisition + €20,000-35,000
- Apartment: acquisition + 25 years of service charges + communal maintenance ≈ acquisition + €35,000-50,000
Energy class: a €1,000/year difference in bills
A Passive House modular home achieves Class A guaranteed by contract (often A+). A typical apartment in Portugal — built before recent SCE revisions — is typically Class B or C:
| Energy class | Annual T3 180 m² consumption | Monthly bill |
|---|---|---|
| Passive House A+ | 1,800-2,800 kWh | €35-55/month |
| Class A | 2,800-4,200 kWh | €55-85/month |
| Class B+ | 4,200-6,000 kWh | €85-120/month |
| Class B | 6,000-8,500 kWh | €120-170/month |
| Class C | 8,500-12,000 kWh | €170-240/month |
Difference between an A+ modular house and a typical Class C apartment: ~€110/month or €1,320/year. Over 25 years: €33,000 of energy saved.
See Class A vs Passive House for the technical analysis.
Flexibility and personalisation
A modular house offers almost total freedom in the project:
- Areas, orientations, typology (T0 to T4+), number of storeys.
- Finishes to choose (kitchen, sanitaryware, flooring).
- Future additions: pool (budgeted separately €20-45k), outbuildings, pergolas, greenhouses.
- Structural renovations (adding rooms, balconies): possible with their own permit.
An apartment offers limited flexibility:
- Fixed area, orientation and number of rooms (floor plan tied to the fraction).
- Interior finishes alterable but limited to existing rooms.
- Balcony limited to fixed area; pool only if a communal one exists.
- Structural changes (opening load-bearing walls, adding rooms, moving plumbing) require condominium approval and frequently impossible.
Resale value at 20 years
Aggregated historical data (Confidencial Imobiliário, 2005-2024):
- Own house in a qualified peri-urban or rural zone: +4-6% per year on average (meta-cycle includes 2008-2013 negative + 2015-2024 strongly positive).
- Apartment in a city: +5-8% per year in expanding zones (Lisbon, Porto, Braga, Coimbra); 0-4% in stagnant cities.
- Class A/Passive House home vs equivalent Class C: premium +8-15% in the long term from qualitative differentiation.
Decisive factor: location always dominates class. A Class A home in a declining zone appreciates less than a Class C apartment in an expanding zone. But at equal location, a Class A home + own plot consistently outperforms an equivalent apartment.
Which option for which profile
A modular house is advantageous for:
- Families with 2+ children or expected growth (area, private outdoor space).
- Young couples 25-40 years old with a long-term project (10+ years of occupation).
- Retirees who value calm, garden, zero direct neighbours.
- Investors in Class A short-term rentals (higher ADR, fewer recurring costs).
- Buyers in peri-urban zones, small cities, qualified rural areas.
- Permanent remote working (space, stability, flexibility).
An apartment is advantageous for:
- Single people or childless couples who live/work in a big city.
- High professional mobility profiles (ease of resale in a big city).
- Elderly who prefer immediate proximity to services and no exterior maintenance.
- Buyers with tight budget in a city where a plot is unviable.
- Short-stay AL investment in a prime zone.
- First buyers unable to move peri-urban due to employment.
Final simulation: T3 modular house vs T3 apartment over 25 years
Scenario: buyer 35-60 years old, 25-year horizon, 90% LTV financing APR 3.8%, mainland Portugal semi-urban zone.
| Metric | T3 180 m² modular house + €100k plot | New T3 180 m² apartment |
|---|---|---|
| Purchase price | €415,000 | €450,000 |
| 10% deposit | €41,500 | €45,000 |
| Monthly instalment | ~€1,760 | ~€1,910 |
| Annual IMI (0.4% VPT ~€300k) | €1,200 | €1,200 |
| Monthly service charge | €0 | €110 (€1,320/year) |
| Monthly climate control | €50 | €140 |
| Total spend over 25 years | ~€616,000 | ~€725,000 |
| Estimated value at 25 years (+5%/year average market) | ~€1,400,000 | ~€1,520,000 |
| Net position 25 years | +€784,000 | +€795,000 |
The final difference is marginal — but the modular house delivers greater flexibility, private outdoor space, Class A and lower recurring costs, while the apartment offers greater liquidity in the city and proximity to services. The decision is more about lifestyle profile than pure numbers.
Figures and procedures indicative for the Portuguese market. Each project is assessed individually according to specific conditions.
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