Investment approach
Sant Just Desvern: the tram below, houses by Collserola above
A suburb on the Barcelona border where flats by the tram and houses on the Collserola slope make two different markets. Idescat figures, transport and checks for a house by the forest.
Sant Just Desvern suits a buyer who wants a quiet life by Collserola a few minutes from Barcelona, but here you have to choose between two markets: a flat below by the tram and a house on the slope. In 2025 the town has 21,045 residents, and 24% of main homes are larger than 120 m², against 10% on average in the Baix Llobregat (Idescat, the Catalan statistics institute). Income per resident here is 60% above the Catalan average.
What kind of town Sant Just Desvern is in numbers
It is a small municipality of the Baix Llobregat (the comarca, or county, south-west of Barcelona) that extends Barcelona's built-up area towards Collserola but remains a separate town. The centre stands at 122 m above sea level and the area is 7.81 km².
| Indicator (Idescat) | Sant Just Desvern | Molins de Rei | Baix Llobregat |
|---|---|---|---|
| Residents, 2025 | 21,045 | 27,291 | 856,867 |
| Homes above 120 m², 2021 | 24% | 8% | 10% |
| Share of rented homes among main homes, 2021 | 21.5% | 17.0% | 18.3% |
| Disposable income per resident, 2023 (prov.) | 33,256 € | 23,013 € | 21,188 € |
The table shows the character of the market. Large flats and houses occur here more than twice as often as the comarca average, and renting takes a noticeable share. A town similarly placed on the edge of Collserola but with a different housing mix is covered in the article on Molins de Rei.
How Sant Just Desvern connects to Barcelona
The main public transport here is the tram, not the metro. Lines T1, T2 and T3 of the Trambaix network run along a shared 6 km section through Barcelona, L'Hospitalet, Esplugues, Cornellà, Sant Joan Despí, Sant Just Desvern and Sant Feliu; the whole network is 15.1 km with 29 stops (TRAM).
For the lower part of the town this is a convenient journey without a car. From the upper districts by Collserola the stop is far and uphill, and many families live there with a car, while some drive to the tram and change. Walk the route from the door to the stop in both directions before buying: the change in height is not visible on a map.
What to check in a house on the slope by Collserola
Houses in the upper part give a garden and a view of the city, but the slope and the forest bring obligations and risks of their own.
Fire-protection strip. Catalan law 5/2003 applies to buildings in the forest and in a 500 m strip around it, and for detached houses the prevention duties lie with the owner (art. 1 and 4 Ley 5/2003). The ayuntamiento (town hall) will clarify whether the house falls within the delimitation plan and what is required of the owner.
What can be built. A plot by the park boundary is checked against the land class and the special plan for Collserola: an extension, a swimming pool or a new building may be impossible. The way such a check is done is described in the article on the map of restrictions around Barcelona.
Slope and water. Retaining walls, drainage and damp in semi-basements and garages cut into the slope. The signs are covered in the article on damp.
How to check a house or a flat before an offer
The sequence is the same for both markets; the emphasis differs.
- Decide which market you need: a flat below by the tram or a house on the slope. These are different budgets and different checks.
- Walk the route to the T1–T3 stop and to the school, uphill and downhill.
- For a house: check extensions, terraces and the swimming pool against the licences and the description in the register, and check the fire regime of the plot.
- For a flat: the floor, the lift, the community's minutes and planned derramas (special levies), the ITE report (mandatory building inspection) for a building older than 45.
- Request the bills for the year: heating, water, garden upkeep, IBI (municipal property tax).
- Compare the price with deals of the same type: a house with houses, a flat with flats.
Who Sant Just Desvern does not suit
The town does not suit someone who wants to live in a house by the park without a car: from the upper districts the tram and the shops are far. Nor does it suit a buyer who counts on extending a house at the Collserola boundary without checking the planning rules: the restrictions may rule out exactly the extension for which the plot was bought.
For those who prefer flat ground, it is worth looking at the neighbouring towns by the river. DNPI checks the price of a house or a flat against deals of the same type as part of a property valuation.
Questions and answers
Can you live in Sant Just Desvern without a car?
In the lower part yes, thanks to the T1–T3 tram. In the upper districts by Collserola it is harder without a car because of the distance and the climb to the stop.
How do you get from Sant Just Desvern to Barcelona?
By the Trambaix tram along the shared section of lines T1, T2 and T3, which enters Barcelona. For the upper districts a combination of car and tram is often more convenient.
What should I check in a house by Collserola?
The fire regime of the plot under law 5/2003, what may be built under the park plan and the land class, the retaining walls, the drainage and damp in the lower rooms.
Is Sant Just Desvern expensive compared with its neighbours?
Income per resident here is 33,256 € against 21,188 € for the Baix Llobregat, and there are more large houses. The price of a specific property is compared with deals of the same type, not with the town average.
Which kind of home is sold most often in Sant Just Desvern?
According to the 2021 census, 37% of main homes are 61–90 m², and 24% are above 120 m². The market is mixed: flats below and houses on the slope.
