Starting with a smaller home and adding a room later is appealing. The first purchase matches today’s needs while leaving another stage open. But a home built from modules is not proof that every later extension will be straightforward or already allowed. The possibility belongs in the project.
Request two drawings
Ask for the initial floor plan and a sketch of the proposed extension, showing access, room relationships and module junctions. If another bedroom would require walking through an existing bedroom, relocating the kitchen or removing a large window, find out now.
This is different from choosing one or several modules for the initial delivery. It concerns a later intervention while the home is in use.
Plan the hidden preparations
Ask the team to assess available land, supports, structure and service connections. Establish which preparations make sense in phase one and which must wait. Check whether the future proposal fits the plot’s planning conditions. In Spain, LOE and CTE form part of the building framework; a specific extension still requires its own assessment.
Discuss documented connection details and who could undertake the second stage. Could another professional use the documentation? What happens if finishes or product ranges change? A promise tied to one commercial model is different from a defined technical solution.
Keep the budgets separate
The catalogue price of another module is not necessarily the price of an extension. Delivery, equipment access, dismantling, service changes and finishes may also be needed. Request a scope and an indicative estimate, identifying what cannot be fixed today.
Useful flexibility is something you can explain: where the extension goes, how it is carried out and what records you will keep. Buying small can be a good strategy when the next stage is more than a slogan.
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Sources
Sources reviewed on 11 October 2026.