Renovation listings invite you to picture the finished home: an open kitchen, exposed beams or a guest suite in the outbuilding. The purchase decision should start one step earlier. Can this particular property deliver those changes, and what must happen before it can? A manageable project has a defined scope and a route through its unknowns. A cheap property with an undefined project is harder to judge.
Write a brief before asking for a building quote
Describe the result you need in ordinary language. You might need a warm home for year-round living, a bedroom and bathroom on the entrance level, or somewhere you can work while other rooms are renovated. Rank these needs. Distinguish the features that justify buying this property from attractive ideas you could abandon if they become impractical.
A useful brief also says when you must move in and whether you can live elsewhere during construction. Do not assume a contractor will infer these requirements from a room count. An older house can be perfectly capable of improvement while being unsuitable for your deadline, access needs or willingness to manage work from another country.
Commission a purchase-focused inspection
Tell the building professional both that you are considering buying and what you want to change. Ask for a written scope: spaces to inspect, accessible services, tests included, report format and limitations. A general visual visit and a detailed investigation are different commissions. Clarify who obtains the owner’s permission for any opening-up or intrusive checks.
Ask the report to separate observations from conclusions. For example, where damp is visible, what has actually been measured, what causes remain possible and what further investigation would narrow them down? Request priorities rather than an unranked list of defects. You need to know what affects immediate use, what should be planned and what remains unknown.
| Finding | Useful next question | Budget treatment |
|---|---|---|
| Visible water staining | What is the source and has it been tested? | Investigate before pricing the remedy |
| Old service installation | What condition and capacity does it actually have? | Define replacement or upgrade scope |
| Proposed wall removal | What is its structural role? | Await the relevant technical assessment |
| Worn finishes | What do you need to replace immediately? | Separate essential and optional work |
Check that the dream layout is a permissible project
Compare the building on site with the documents, including previous projects and permissions where relevant. Ask about the status of extensions, converted spaces and ancillary structures. If the purchase only makes sense with an extra floor, a new opening or residential use of an outbuilding, treat that as a question to resolve before committing to the price.
The national Land and Urban Rehabilitation Act sits alongside regional planning law and local rules. The answer must relate to the actual property. Our guide to requesting planning information provides a starting point for the municipality-specific enquiry.
Existing buildings are not simply outside Spain’s Technical Building Code. Its application depends on the intervention and relevant provisions, with technical justification and specific treatment of constraints. See CTE article 2. Ask your designer to explain what your proposal triggers instead of assuming either that every element must be rebuilt or that no current requirements matter.
Price work packages, not optimism
Split the project into enabling work, necessary repairs, service installations, layout changes and finishes. Include access arrangements, waste handling, temporary protection and commissioning where relevant. Then add design, professional supervision, applicable permissions and taxes, along with accommodation and storage you will need because the house cannot be occupied.
Provide the same written scope to contractors and ask them to identify exclusions and provisional items. Our guide to comparing Spanish construction quotes explains how to make offers comparable. A low figure is only helpful when you understand which work it buys and which decisions could change it.
Keep a list of unknowns with a proposed way to resolve each one. A contingency reserve is useful planning, but it is not a diagnosis and does not make an unpriced structural issue disappear. If the inspection points to foundation concerns, read the foundation-cost guide for the information needed before discussing a solution.
Choose between three versions of the project
Create a minimum usable version, the version you actually want and a list of changes dependent on further findings. The minimum version should still meet the conditions required for your intended use; it is not permission to move into an unsafe or unsuitable house. Ask what can sensibly be postponed without undoing completed work later.
For example, replacing a kitchen finish may wait, while work beneath that kitchen could make doing the finish first wasteful. The sequence needs professional input, but the purchasing implication is straightforward: compare properties on the cost and disruption of reaching a usable result, not solely on the advertised discount.
Plan who will make decisions when you are away
Agree who checks work, handles questions and authorises changes if you will not be locally available. Ask how progress is evidenced and how variation proposals are priced before approval. A stream of attractive progress photographs does not necessarily show hidden work or explain what changed from the specification.
Check the programme’s dependencies: further investigation, design, permissions, contractor availability and supply lead times. Allow for visits that genuinely require you to attend. An inflexible relocation date can make a modest project more stressful than a larger one with adequate time.
Make your offer reflect what is known
Combine price, acquisition costs, defined works and temporary living costs using the complete buying-budget structure. Compare that figure with alternatives that already meet your needs. Do not assume every euro spent will be recovered on resale; personalisation has value to you that a future buyer may not share.
A pre-purchase building survey helps separate visible condition concerns from unanswered technical questions. If a defect emerges after completion, use the guide to hidden defects in resale property to understand the evidence and timing issues.
Before agreeing to reservation or arras terms, ask your adviser how unresolved essential checks should be treated. Your next step is a short evidence pack: listing, plans, photographs, inspection scope and the changes that matter most. Describe the location, combined purchase-and-work budget and move deadline if you want to frame a renovation-property search around those requirements.
Sources and further reading
- Código Técnico de la Edificación: intervenciones en edificios existentes
- Ley de Suelo y Rehabilitación Urbana
Sources checked on 19 September 2026. Your property documents and local requirements determine how the guidance applies to your project.

