Checklist before buying a plot to build a villa in Marbella or Estepona

Buying a plot on the Costa del Sol is rarely a decision based solely on location or sea views. Two neighbouring plots, with an almost identical price per square metre, can result in a difference of hundreds of thousands of euros in the real cost of building a villa. The slope, orientation, access, municipal regulations and the condition of utility connections can all affect the budget long before the first wall is built, especially when building close to the sea.

This guide covers what should be reviewed before signing, from the perspective of a company that carries out building work every day in Marbella, Estepona, Benahavís and Sotogrande.

Purchase price and real cost are not the same

The most expensive mistake is assessing a plot only by its sale price. A plot that appears to be inexpensive, but has a steep slope, difficult access for machinery or distant utility connections, can end up costing more than another plot that is better positioned and ready to build on.

That is why it is worth having an architect and a construction company review the plot before completing the purchase. A technical consultation of just a few hours can prevent a six-figure cost overrun.

Technical checklist before signing

Planning regulations and buildability
This is the first thing that must be confirmed with the local council:

Land classification, whether it is consolidated urban land or not.
Buildability and maximum occupancy: how many square metres can actually be built.
Setbacks from boundaries and the maximum permitted height.
Compatibility with a basement, swimming pool, garage and porches.

It is important to distinguish between buildability on paper and the real usable buildability: setbacks and slope often reduce the usable surface area.

Land and geotechnical conditions
A geotechnical study reveals the type of ground, the depth of the rock and the water table level. In our area, it is common to find expansive clay or rock at shallow depth, and both situations increase foundation costs.

Utility connections and services
Check the availability and actual distance of water, electricity, including power supply and proximity to the transformer, drainage and telecommunications. An urban plot may still require a significant amount of connection work.

Orientation, views and privacy
Views are not everything. A good orientation improves sunlight exposure, reduces air conditioning consumption and increases the value of the property. You should also consider westerly winds, privacy from neighbours and the most logical location for the swimming pool and terraces.

How slope affects the budget

This is the factor that most distorts costs on the Costa del Sol. On sloping plots, which are very common in Benahavís or in the upper areas of Estepona, you need to allow for:

Earthworks and excavation, sometimes through rock.
Retaining walls, one of the most expensive items and one of the easiest to underestimate.
Foundations adapted to the slope.
Access routes, garage ramps and drainage to manage surface water runoff.

A steep slope does not rule out a plot — in fact, it often provides the best views — but it must be budgeted for from the outset, not discovered once work has started.

Documentation you should request

Before signing, gather the following: an up-to-date land registry extract, the planning report from the local council, a topographic survey, a certificate of charges, information on utility connections and, if available, the geotechnical study. It is also important to understand the difference between a minor works licence and a major works licence, because a newly built villa will always require a major works licence with a complete technical project.

When the construction company should get involved

There are aspects that cannot be seen on plans: the real access for lorries and cranes, the complexity of building a retaining wall, or the risk of damp caused by surface runoff and buried walls. A construction company with local experience can identify these points before the purchase and help adjust the budget realistically. At MLZ, we support this preliminary phase to validate the technical feasibility of the project, just as we do with any bespoke villa and chalet construction project.

Common mistakes

Buying solely for the views.
Not calculating the cost of the slope or retaining walls.
Assuming that “urban” means ready to build.
Not checking the real usable buildability.
Signing without prior technical advice.

Conclusion

The best plot is not always the one with the best location, but the one that allows the desired villa to be built with technical certainty, economic feasibility and a budget free from surprises. Validating these points before signing is probably the most profitable investment of the entire project.

FAQs

What should I check before buying a plot to build on? You should check the real buildability and occupancy, the slope of the land, access for machinery, utility connections, orientation and a geotechnical study. These factors determine both the feasibility of the project and the final cost.

Is a geotechnical study compulsory before building a villa? Yes. The Spanish Technical Building Code requires it for the project, and it is also the best tool for anticipating the cost of foundations and retaining walls. Knowing the result before buying is highly recommended.

Does a sloping plot always make construction more expensive? Almost always, because of earthworks, retaining walls and foundations. It does not rule the plot out — it often offers better views — but the additional cost must be budgeted for from the beginning.

What documentation should I request before buying? You should request a land registry extract, planning report, topographic survey, certificate of charges, information on utility connections and, if available, the geotechnical study.

Can a construction company help me before buying the land? Yes. A construction company with local experience can assess access, execution complexity and risks that do not always appear in the documentation, helping to avoid cost overruns and poor decisions.