What it costs to build a house, and when you can get a firm figure
A firm budget for a house in Barcelona or its province can only be given on the basis of the construction-stage design with a full bill of quantities. Before that, you get a range that narrows with each design stage. As a guide to finish level, we use our own tiers: Basic from €1,000/m², Standard from €2,000/m² and Luxury from €3,000/m², excluding VAT. A new house, however, adds earthworks, foundations, structure, roof, façade and utility connections on top of the finishes, so those figures cannot be applied to a new build as they stand.
If someone quotes you a price per square metre without seeing the plot or the drawings, they are giving you an average. An average knows nothing about the slope of your land, the ground conditions or how much glass there is on your façade.
Three stages at which the budget gets sharper
Stage one is the plot and the brief. We look at the area, the topography, access for machinery and what you want inside: number of bedrooms, pool, basement, garage. At this point we can give a range and point out which decisions push it up.
Stage two is the architect’s outline design, the proyecto básico. Volume, number of floors and the areas of façade and roof appear. The budget becomes itemised, although many items are still lump sums.
Stage three is the construction design, the proyecto de ejecución, with details, specifications and quantities. Only this document supports a budget you can sign a contract on. If a builder is willing to fix the price earlier, ask what they have put into the undefined items. There is usually either a large cushion or future extras.
What a house budget includes, and what usually sits outside it
A construction budget is normally split into chapters: earthworks, foundations, structure, roof and waterproofing, façade, windows and external doors, building services, interior finishes, landscaping, pool and solar panels.
Several costs usually sit outside the builder’s quote even though the owner pays them anyway. Fees for the architect and the technical architect, the health and safety coordinator, the topographic survey and the geotechnical study. The construction tax (ICIO) and the licence fee, both calculated by the Ajuntament. Water, power and sewer connections. Notary and land registry fees for declaring the new building, plus the insurance requirements under the LOE. Which of these apply to you, and how much they come to, is confirmed with the Ajuntament and your gestor. When you compare quotes, compare what is inside them, not the bottom line.
The plot can move the number more than the finishes
Two houses of the same size, built from the same drawings, can cost very different amounts because of the ground underneath. A slope means retaining walls and more earthworks. Rock makes excavation expensive; soft ground makes the foundations expensive. On a narrow lane in the Garraf hills a concrete truck may not reach the plot at all, and that changes the construction method.
That is why the geotechnical study is commissioned before the construction design, not after it. We explain the difference between a topographic survey and a geotechnical study in a separate guide. The point here is simple: until the geotechnical report exists, the foundations chapter of any budget is a guess.
The decisions that move the budget most
A basement: excavation, retaining walls and below-ground waterproofing are expensive even if all you put inside is a storeroom. A house with a complicated footprint, lots of corners and roofs at different heights costs more than a compact volume of the same floor area. Large spans and floor-to-ceiling glazing call for a heavier structure and more expensive window frames.
Building services count too. Air-source heat pumps, underfloor heating, heat-recovery ventilation, home automation and solar panels add cost now and cut running costs later. These choices need to be made before the construction design is drawn up. Otherwise the budget gets recalculated as you go.
A real example: a family house with a pool
The house with a pool and solar panels that we delivered from start to finish between 2022 and 2024 was budgeted as a single whole from day one. The pool, the plant room and the panels were in the design and in the budget from the beginning. They were not bolted on after the structure went up.
That sequence saves money at the interfaces. Pipe runs to the pool are laid before landscaping, space for the equipment is in the house plan, and roof loads and penetrations are in the drawings. When a pool is decided a year after moving in, part of the finished garden and terrace has to be dug up again.
Contingency, payments and the next step
Even with a good design, keep a contingency, for example 5 to 10 % of the budget. Things turn up on site that nobody can see in advance, and it is better to have money set aside for them. Payments are tied by contract to construction stages: foundations, structure, roof, weathertight shell and finishes.
To get started, send us the cadastral reference or address of the plot, its area, a few photos and a description of the house you have in mind. We reply within an hour and work in Russian and Spanish. Then we visit the plot and give you a first range, explaining what it depends on.