How to choose a solar installer on the Costa del Sol
A polished proposal is not enough. Verify who is contracting, who is responsible for the electrical work and how the system will be supported after handover.
Reviewed August 2026
QUICK ANSWER
How can I check a Costa del Sol solar installer?
Confirm the contracting legal identity, tax details, physical contact information, electrical-installer responsibility, relevant insurance, written scope, equipment models, payment milestones, legalisation duties, warranty routes and recent comparable references. Check those details independently before paying a substantial deposit.
Know exactly who the contract is with
The quotation should identify the legal entity accepting payment and responsible for the work. Trading names, lead-generation sites and equipment brands are not substitutes for a contracting identity.
Ask whether roof work, scaffolding, electrical work and registration are completed by the contractor or subcontractors, and who remains responsible if something goes wrong.
Test the design, not the sales presentation
A serious proposal uses bills, roof measurements, shade and equipment data. It explains monthly production, self-consumption, exports and the assumptions behind savings.
Challenge panel counts chosen before a site survey, guarantees of a universal payback period, or battery recommendations without evening consumption and surplus data.
Make the scope and payments auditable
Record exact panel, inverter and battery models, mounting, cable routes, protection, monitoring, access equipment, exclusions and making-good. Link payments to defined milestones.
Paperwork should name responsibility for electrical certification, Andalucía registration, any municipal requirement and supplier follow-up.
Check the support path
Equipment warranties and workmanship cover are different. Ask who handles fault diagnosis, roof leaks, monitoring problems and manufacturer claims, including likely response times.
Keep the final specification, serial numbers, photographs, as-built drawings, certificates, monitoring credentials and warranty documents outside the installer's own systems.
Price alone is not a reliable quality measure. Compare the complete scope, equipment, assumptions, responsibilities, warranties and exclusions.
How large should a solar deposit be?+
There is no universal figure. Avoid front-loading risk and link payments to documented milestones, equipment delivery, installation and completed handover.
Who should legalise the installation?+
The contract should identify who prepares and submits the required documents and who follows through with the distributor and supplier.
Are manufacturer warranties enough?+
No. They do not replace workmanship responsibility, roof integrity, diagnosis, labour or a practical local claim route.
Should I ask for references?+
Yes. Prefer recent projects with similar roofs, electrical arrangements and equipment, and verify the reference independently.
APPLY IT TO YOUR PROPERTY
Use the guide to ask better questions, then discuss your project.