Choosing a builder in Spain is harder when you are also navigating a different language and working from another country. A friendly English-speaking contact can make the process easier, but the contract still needs to identify the business doing the work, the technical team and the exact scope.
The most useful comparison is a short list of genuinely equivalent offers. Get the drawings and specification aligned first, then examine the company's ability to organise the work. Otherwise, a polished presentation can distract you from missing items or payment terms that do not suit your project.
Establish who is quoting and who is building
Ask for the legal identity of the contracting company, the person authorised to sign, and the person who will manage your site. If the introduction came through an agent or sales office, clarify its role and who is responsible for construction, design coordination and aftercare.
Request evidence relevant to the proposed work: similar buildings, the same structural method and comparable site difficulties. A refurbishment portfolio does not automatically demonstrate experience delivering a new home from foundations to commissioning. Ask for references you can contact with the previous client's permission.
Spain's construction subcontracting law sets requirements for firms within its scope. Check the applicable accreditation and subcontracting arrangements with your advisers. Administrative compliance is one check, not proof that the proposed team is right for your house.
Issue one tender pack with one revision number
Give every bidder the same drawings, quantities, specification and available site reports. Date the package and keep a record of questions. If one bidder identifies an ambiguity, circulate the clarification so competing prices respond to the same requirement.
Where the design is still evolving, call the response an estimate. Ask which assumptions underlie it and what would be needed for a firmer offer. A builder cannot remove unknown ground conditions simply by describing a price as fixed. Our guide to site surveys explains information that may need to come first.
Translate the quote into completed deliverables
For every line, ask what will physically exist when the work is finished. Preinstalación may mean provision for later equipment; it should not be read as a complete functioning system. A generic reference to kitchen work might describe service connections rather than fitted cabinetry and appliances.
| Comparison area | Get the answer in writing |
|---|---|
| Building fabric | Wall and roof build-ups, windows, shading and finishes |
| Services | Equipment, distribution, controls and commissioning |
| Site works | Excavation assumptions, access, waste and utility boundaries |
| Selections | Product references, allowances and substitution rules |
| Price | Tax treatment, provisional amounts and adjustment conditions |
| Completion | Inspections, documents, training and outstanding-work procedure |
Write included, excluded or provisional beside each item. Do not record a blank as zero. If one offer includes cooling equipment and another only its connections, obtain a price for the missing scope before comparing the totals. The same principle applies when comparing material quotations.
Agree how you will make decisions from abroad
Set a regular reporting format: progress against the programme, dated photographs, decisions needed, approved changes and forecast payments. Photographs are useful records, but they do not replace the technical inspection required for a concealed detail or completed stage.
Choose one channel for formal instructions and keep an agreed decision log. Specify who can approve a change and what happens when you are unavailable. A helpful relative visiting the site should not accidentally become the person authorising additional costs.
If documents are bilingual, agree how inconsistencies will be resolved and have the actual contract reviewed in a language you understand. An informal English summary of a Spanish agreement can leave out the very clauses that matter when something changes.
Look beyond the promised completion date
Ask for a programme that starts with the actual prerequisites: design approval, applicable permissions, site readiness and long-lead purchases. Identify your own decision deadlines. A late choice of window dimensions can affect manufacture and several follow-on activities, not just the window order.
Clarify which delays can change the programme, how they are notified and how revised dates are agreed. If an industrialised supplier advertises a short installation period, compare that with the full route to occupation. Our modular and traditional home comparison separates manufacture, site work and completion.
Check the payment schedule against your funding
Before signing, place proposed payments on a calendar alongside your available funds. Ask who verifies progress and what documents support each invoice. Agree how variations will be priced and approved before the changed work begins.
For advance payments or off-site manufacture, ask how the paid-for goods are identified, who owns them at each stage and what protection is provided if delivery fails. These are contract-specific questions for your legal adviser, particularly if the supplier and site contractor are separate businesses.
Keep project expenses outside the builder's contract visible. Our whole-project budget guide helps avoid spending money already needed for professional fees, connections or other appointments.
Design the handover before construction starts
The LOE, article 6, provides for formal receipt of the work and documented reservations. Plan the technical review and record unresolved items clearly, with responsibility and correction dates.
Ask for an agreed completion pack covering relevant as-built information, equipment instructions, test results and warranties. Arrange a practical demonstration of controls and maintenance access. Discovering that nobody has explained the ventilation or heating system is an avoidable weakness in an otherwise well-built house.
Finally, establish a named aftercare contact and a written route for reporting defects. Compare contractual promises and applicable responsibilities with your adviser rather than assuming a familiar warranty model from your home country applies unchanged.
Make the choice on a short, comparable record
For each finalist, summarise complete price, remaining uncertainty, site team, programme and payments. If a key answer is missing, ask for it before making the decision. A slightly higher offer with a fully defined scope may be easier to assess than an attractive total surrounded by unresolved costs.
Compare the payment mechanism as carefully as the total. Our guides to construction certificates and stage payments and turnkey contract exclusions help turn the preferred quote into an appointment with clear payment triggers.
You can describe your construction project with its location, stage and the help you need selecting a contractor. Mention whether you will manage locally or from abroad, because the reporting and coordination arrangements should reflect that from the start.
Sources and further reading
Sources checked on 19 September 2026. Your property documents and local requirements determine how the guidance applies to your project.
