Castelldefels · Barcelona
Rental yield in Castelldefels
Castelldefels is a mid-priced area for Barcelona, with an average rental yield and a Total Return below the city average. Here is what a typical flat in Castelldefels costs to buy and rent, and the Total Return (IRR) it delivers, compared with the other areas of Castelldefels.
Sale price
3,904
€/m² · second-hand homes
Rent
12.6
€/m² per month · SERPAVI legal cap
Gross yield
3.9%
annual rent ÷ price
Total Return
3.7%
10-year IRR · typical flat
Appreciation
+3.0%
a year, 10-15 year history
Cash flow
-€405
per month, year 1, after tax
What the data says
Castelldefels is an area of Castelldefels, in the Barcelona metropolitan area. The reference sale price is €3,904/m², based on the Fotocasa index adjusted to transaction prices: 6% below the Barcelona median (€4,141/m²). It ranks 47 of 86 areas in the Barcelona region by price.
The reference rent is €12.6/m² per month (SERPAVI median for the neighbourhood, 2024): about €945 a month for a typical 75 m² flat. Castelldefels is a declared stressed rental zone, so that figure acts as the legal cap on a new tenancy. The gross yield (annual rent ÷ price) comes to 3.9%, 0.2 points below the city median (4.1%): rank 56 of 86 by gross yield.
With a 70% mortgage at 3.80% over 25 years and a sale after 10 years, the estimated Total Return (IRR) for that typical flat is 3.7%, below the Barcelona median (4.1%). It takes about €119,359 of cash (deposit, taxes and costs), and first-year cash flow after tax is -€405 a month.
Asking prices in Castelldefels have grown by an average of 3.0% a year over the last 10 and 15 years (idealista, December 2025). Historical, not a forecast: it is the appreciation the modelled sale assumes.
A typical flat in Castelldefels
The same standard assumptions as the CasaROI map: change the mortgage, term or tax profile in your account and the Total Return is recalculated for your case.
- Size
- 75 m²
- Purchase price
- €292,800
- Monthly rent
- €945
- Cash needed · deposit + transfer tax + costs
- €119,359
- Monthly cash flow (year 1)
- -€405
- Total Return (IRR)
- 3.7%
Assumptions: 70% mortgage over 25 years at 3.80%, sale after 10 years, Spanish tax resident at a 37% marginal rate, no renovation.
Nearest areas, ranked by gross yield
| Area | €/m² | Rent €/m² | Gross | IRR |
|---|---|---|---|---|
| L'Hospitalet de Llobregat | 2,666 | 13.0 | 5.9% | 5.5% |
| Sant Boi de Llobregat | 2,327 | 10.8 | 5.6% | 3.7% |
| la Marina del Prat Vermell - Zona Franca | 3,465 | 15.0 | 5.2% | 6.4% |
| Cornellà de Llobregat | 2,706 | 11.1 | 4.9% | 3.6% |
| El Prat de Llobregat | 2,820 | 10.8 | 4.6% | 3.6% |
| Sants - Badal | 4,320 | 14.9 | 4.1% | 4.8% |
| Castelldefels | 3,904 | 12.6 | 3.9% | 3.7% |
| la Maternitat i Sant Ramon | 5,009 | 15.3 | 3.7% | 4.1% |
| la Marina de Port | 4,356 | 12.8 | 3.5% | 3.7% |
Frequently asked questions
How much does a square metre cost in Castelldefels?
€3,904/m² on average, based on the Fotocasa index adjusted to transaction prices. A typical 75 m² flat costs about €292,800, 6% below the Barcelona median.
How much is rent in Castelldefels?
The reference rent is €12.6/m² per month: about €945 a month for 75 m². As a stressed rental zone, that figure is the legal cap on a new whole-flat tenancy (room-by-room lets are exempt).
Is Castelldefels a good buy-to-let investment?
The gross yield is 3.9% (Barcelona median: 4.1%). With a 70% mortgage and a sale after 10 years, the estimated Total Return (IRR) is 3.7% against a city median of 4.1%. It depends on your financing and tax residency: with your own profile the number can change.
Is Castelldefels in a stressed rental zone?
Yes. Castelldefels is a declared stressed rental zone, so on a new whole-flat tenancy the rent is limited by the official reference index (SERPAVI).
Buying in Castelldefels?
Paste the listing and we tell you whether it holds up at that price: legal rent, taxes, red flags and a verdict.
Sources and method
- Sale: idealista · municipal sale-price report (June 2026) · ÷1,13 a precio de transacción (calibrado vs registral Madrid/BCN)
- Rent: SERPAVI · declared rent for the municipality (Housing Ministry/AEAT 2024) · stressed rental zone
- Appreciation: average of the 10- and 15-year rates of the area's asking price — historical, not a forecast