Turnkey vs. self-build: which is cheaper after 5 years?

Short answer: turnkey comes out substantially cheaper on total cost after 5 years — not on the construction itself, but on the personal time saved, the overruns avoided, the guaranteed energy efficiency and the opportunity cost. A realistic comparison shows a difference of more than €150,000 in favour of turnkey on a T3 home in the Algarve.

This article does the full analysis with concrete numbers and all the relevant variables — not just the construction price.

Starting point: reference scenario

Let's compare two approaches for the same goal: build a 180 m² T3 detached house on a 750 m² lot in the central Algarve (Loulé/São Brás). Brief: 3 bedrooms, 2 bathrooms, open-plan living + kitchen, office, terrace, 5×2.5 m swimming pool.

Option A — Turnkey (Ecoimport Wood): contract signing with fixed price, binding timeline, all projects and licensing included, Passive House panel-frame produced at a partner European factory, 2-week on-site assembly.

Option B — Traditional self-build: buy the architectural project and engineering from an independent architect, hire a site foreman for concrete/brick and coordinate contractors for each speciality (electrician, plumber, carpenter, painter, etc), day-to-day personal management.

Cost of the construction itself

Straight to the market numbers in the Algarve in 2026:

Important note: the €315,000 base is similar because Ecoimport Wood uses industrial production (economies of scale and no site downtime), while traditional construction has similar labour and material costs in the Algarve. The real difference starts to appear in the overruns.

The cost of your personal time

This is the most frequently ignored item — and the most expensive. Managing a traditional self-build requires, on average:

• Weekly coordination of foremen and contractors (5-8h/week)
• On-site technical decisions on unforeseen details (3-5h/week)
• Site visits for oversight (4-6h/week)
• Suppliers, quotes, orders (3-5h/week)
• Administrative management (invoices, payments, licences) (2-3h/week)
• Emergency problem-solving (unpredictable, 5-10h/week)

Realistic total: 25-35 hours per week for 24 to 36 months. Assuming 30h/week × 30 months × 4.3 weeks/month = 3,870 hours.

At what hourly rate should you value your time? Let's be conservative: €20/hour (the average net wage in Portugal in 2026 is €12-15/hour, but managing construction requires technical skills that are worth more).

Personal cost in self-build: ~€77,000 in unpaid personal time.

On a turnkey build, personal time involved is around 50-70 hours over 6 months — design decisions at the start and occasional oversight. Personal cost: ~€1,400.

Difference in personal time: +€75,600 in favour of turnkey.

Operating cost over 5 years

A Passive House Ecoimport Wood home consumes 60-80% less energy than a new traditional Class B build (the most common in the Algarve for recent traditional construction). Real annual figures for a T3 in the Algarve:

Difference over 5 years of operation: +€9,500 in favour of turnkey.

Cost of the delivery timeline

This is an indirect but real cost: the time between paying for the land and moving in. On a self-build that takes 30 months, the typical client:

• Continues paying rent on current housing (~€800-1,200/month) for 24-30 months.
• Pays IMI (Portuguese municipal property tax) on the land without benefiting from the completed property.
• Loses inflation adjustment on capital already invested in unfinished work.

On an Ecoimport Wood build, the client moves in 6 months after signing the contract. Over the remaining 24 months (compared to the self-build), they already live in the new home without paying alternative rent.

Indirect cost of the timeline: +€20,000 in favour of turnkey (rent + IMI + opportunity cost).

Final balance after 5 years

Total difference: ~€170,000 in favour of turnkey, plus valuation upside.

When does self-build still make sense?

To be honest: there are situations where self-building is worth it. Specifically:

• You're a civil engineer or architect with construction experience — your time has an opportunity cost close to the market price you'd pay a site manager.
• You have full availability (retired, sabbatical, career change) to devote 30h/week for 2-3 years.
• You have a prior relationship with a trusted foreman at non-market prices, with a verifiable track record.
• You're in a region where traditional construction still has substantially lower costs than industrial systems (not the case for the Algarve in 2026).

If none of these conditions apply, the numbers push strongly towards turnkey.

And the legal risks of the shadow economy?

A delicate but important point: many self-build projects in the Algarve are executed partially without legal invoices to reduce costs. This has consequences:

1. Without invoices, costs cannot be deducted from IRS (Portuguese personal income tax) (you lose 5-15% of the refund).
2. The occupancy licence can be blocked if the tax authority cross-checks data.
3. The energy certificate is not issued correctly if installation certificates are missing.
4. The structural warranty does not legally exist without properly invoiced work.
5. In case of accident or defect, the client has no legal recourse.

This risk doesn't appear in the initial budget column but frequently materialises 3-8 years after moving in. Avoidable costs with a properly invoiced turnkey contract.

"The initial budget price says little about the real cost. What matters is the total cost over the following 5-10 years — including personal time, energy, risks and timeline."

Conclusion

When we compare only the initial budget "per m²", turnkey and self-build can look close. When we compare the real cost over 5 years — construction + personal time + overruns + operation + timeline + risks — the difference easily exceeds €150,000 in favour of turnkey.

It's not magic. It's professional management of an industrialised project with a fixed price, the opposite of craft construction with many hands and diluted responsibilities.

Ideal client profile for each option — decide in 5 minutes

The choice between turnkey and self-build is not philosophical: it is a matter of personal profile. The two blocks below list objective signs; at the end there is a scoring rubric to reach a decision in a few minutes.

A. 8 signs that turnkey is the right option:

• You work full-time with over 40 hours per week and have no margin to follow a weekly building schedule.
• You have no previous construction experience and no direct contacts with trusted engineers, foremen or contractors.
• You live more than 60 km from the site or abroad during construction.
• You need a certain, binding deadline — for example to coordinate the sale of another property, a school change or the start of rental income.
• The plot is standard (no major slope, good access, clear urban aptitude, no REN/RAN restrictions).
• You have low financial risk tolerance and prefer to pay 8–12% more for a fixed price with delay penalties.
• You value a single responsible entity rather than coordinating 10–15 different sub-contractors.
• You plan to finance with a mortgage: banks prefer turnkey because it simplifies analysis and reduces overrun risk.

B. 5 signs that self-build may make sense:

• You are a civil engineer, architect, foreman or hold technical training that lets you coordinate the trades yourself.
• You have available personal time (minimum 15 hours per week for 12–18 months) and proven flexibility.
• You live locally and personally know trusted contractors who have delivered good work for you before.
• The project is small (1- or 2-bedroom) or a renovation/extension with a limited scope, not a full new house.
• You explicitly accept the risk of 20–35% budget overrun and 6–12 months schedule slip, both financially and emotionally.

Decision rubric (add up the points):

Total ≥ 6 points: self-build may make sense in your case. Between 0 and 5: hybrid (contract the structural phases turnkey and self-manage the finishes). Below 0: turnkey is clearly the better option. This rubric is not a substitute for personalised technical advice, but it offers an honest first orientation based on objective criteria rather than marketing.

Figures and comparisons shown are 2026 market estimates and may vary by project, plot and supplier.

→ Get your personalised turnkey quote (48h) or see our Local Accommodation investment analysis if you're building to rent.