1. Compare two versions of the same house
Choosing from a photograph often means comparing homes that do not have the same area or brief. Start with an identical list of rooms, approximate usable floor area, garage, porches and relationship with the garden. Ask for one single-storey scheme and one two-storey scheme that meet those same needs. Only then can you compare circulation, built area, structure and finishes without attributing to height differences that actually come from another design.
2. Let the plot rule out what does not fit
A single-storey house needs a larger footprint, but the plot is limited by site coverage, setbacks, buildable depth, access and other planning conditions. A two-storey solution may free up garden, separate views or fit a narrow plot better; it may also be unnecessary if the land allows everything to be organised well on one level. Draw the genuinely buildable area first, then position the house, parking, pool and outdoor spaces.
3. Treat the staircase as a room and an everyday route
A staircase takes up space, affects the structure and organises every movement between floors. The Spanish Building Code’s DB-SUA Basic Document regulates safety-in-use matters such as steps, landings, guarding and handrails. Beyond technical compliance, think about shopping, laundry, children’s bedrooms and future mobility. If you choose two storeys, consider placing a usable bedroom and bathroom at entrance level or allowing for a possible future adaptation.
4. Compare the complete foundations, structure and envelope
There is no universal rule that always makes one option cheaper. For a similar usable area, one storey may require a larger foundation and roof footprint; two storeys reduce the footprint but add an intermediate floor, staircase and work at height. The official DB-HE guide notes that the thermal envelope must be defined in plan and section around the included spaces. Ask both proposals to state the same areas, quality levels, construction system and included elements.
5. Prepare the decision before making contact
To request a quote, gather the municipality, plot reference and dimensions, a topographical plan if available, the available planning rules and one shared room brief. State the desired usable area, number of bedrooms and bathrooms, garage, porches, pool, accessibility priorities and spaces that must remain at entrance level. Attach both schemes if you have them and ask each company to explain which alternative it is pricing, what is included and what remains subject to design.
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A Constructores.com guide. Informational content; every project requires professional assessment.