Build or buy: the cost comparison calculator
Land, design, permits and construction — always as ranges, never false precision — against the price of an equivalent home already built.
Purchase price of the building plot — €0 if you already own it.
≈ €1,300 – €1,850 /m² turnkey applied in this zone, 14–18 months of estimated build time.
You finance the land purchase — registration costs follow the deed-with-mortgage figures.
For comparison: an equivalent ready-built home
An already-built home, same size and zone.
Exempts IMT and stamp duty (Imposto do Selo) in the buy-ready scenario — for a fair comparison.
Only if you are building your own primary residence and meet the value cap and the dates (DL 97/2026).
Building should cost you
€267,155 – €362,455
Buy ready-built
€400,052
Difference
building costs between €37,597 and €132,897 less
14–18 months to build vs 2–4 months to buy.
Where this range comes from
| Land | €60,000 |
|---|---|
| IMT on the land (6.5%) | €3,900 |
| Stamp duty on the land purchase (0.8%) | €480 |
| Land registration | €375 |
| Architecture and engineering designEstimated range | €4,000 – €9,000 |
| Municipal licensing feesVaries a lot by municipality — estimated range | €2,000 – €7,000 |
| Construction (Traditional)Estimated range, VAT included in the €/m² turnkey price | €195,000 – €277,500 |
| Site management and inspectionEstimated range | €1,000 – €3,000 |
| Occupancy permit + final registrationEstimated range | €400 – €1,200 |
| Estimated total to build | €267,155 – €362,455 |
Estimated ranges based on 2026 market bands — always get 2–3 real quotes. 23% VAT included in the €/m² turnkey price.
Non-resident buyer? Since 25-05-2026, IMT on the ready-built home is 7.5% of the full value, with no brackets or exemptions (art. 17.º, n.º 10, of the IMT Code) — for a couple married under community of property, only if neither spouse is or has ever been a tax resident; with co-ownership, each share counts on its own. This comparison uses resident rates — run the numbers in the IMT or total purchase costs calculator. IMT on building land does not change.
The new RJUE (DL 108/2026) — Regime Jurídico da Urbanização e Edificação, Portugal’s building-licensing framework — takes effect on 1 October 2026 (DL 155-B/2026) and changes licensing procedures; until 30 September 2026 the previous RJUE (DL 555/99) applies.
Why this always comes as a range
The "turnkey" price per m² that any builder quotes you includes materials, labour, standard finishes and the 23% VAT on the works. What is left out — and what most people forget — is the land, the design (architecture and engineering), the municipal fees for licensing, and the utility connections, which vary from plot to plot.
There are three building systems, each with a different cost and timeline profile. Traditional masonry runs between €1,300 and €1,850/m², with a build of 14 to 18 months. LSF (Light Steel Framing) runs between €1,100 and €1,800/m², but in 6 to 8 months — the gain is in the schedule, not the budget. ICF (insulated concrete formwork) runs between €1,200 and €2,000/m², with an intermediate 8 to 12 month timeline and better thermal performance.
These national bands rise 20% to 40% in Lisbon, Porto and the Algarve, and fall 10% to 20% in the interior. The land, separately, always pays IMT (property transfer tax) at the flat rate of 6.5% and stamp duty (Imposto do Selo) of 0.8% on the purchase — it doesn’t fall under the housing brackets, because for the tax authorities it is land for construction, not a house.
On top of the licensing comes the architecture and engineering design (€4,000 to €9,000) and the municipal fees (€2,000 to €7,000, with big variation between councils). A 150 m² three-bedroom (T3) house in the traditional system, national zone, on a €60,000 plot already paid in cash, comes out between €267,155 and €362,455 end to end — land, land taxes, design, fees, construction, site management and occupancy permit included. To compare against the cheque for buying an equivalent ready-built home, use the total purchase costs calculator.