The standard way to hire a builder on the Costa del Sol is to ask a Facebook group. In December 2025, readers reported what that can cost: a couple in La Cala de Mijas paid €2,000 up front on a €10,000 terrace job to an English builder recommended in three separate expat groups. There was no written contract. He demolished the old tiles in week one and was gone by week three, leaving a stripped terrace, a dead phone number and a repair bill of €8,000 to €10,000 plus permits. The recommendation was sincere. It was just not vetting.
This guide covers what verification looks like before any money moves: the paperwork that has to exist, the three documents worth requesting and how far each can be checked, what deposits are normal, what work costs in 2026, and the escalation ladder if it goes wrong anyway. None of it requires fluent Spanish, and most of it takes under an hour.
Last verified: 10 August 2026.
What a group recommendation actually tells you
A Facebook recommendation measures one thing: someone liked this person recently enough to type their name. That is worth having. Groups are a reasonable place to collect candidate names, and they are genuinely good at the opposite signal, the avoid-this-one warning, which spreads fast and is usually anchored to a specific grievance.
What a recommendation does not measure is anything that predicts whether your job ends well. The recommender almost never saw a contract, checked an insurance certificate, or watched what happened when a problem surfaced six months later. Praise gets posted the week a job finishes, which is precisely before latent defects appear. And recommendations recycle: once a name has momentum in one group it gets reposted in others, which is how the La Cala builder arrived pre-validated in three of them. Three groups, one echo.
Use the groups to build a shortlist. Then vet the shortlist as if nobody had recommended anyone.
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The paper that has to exist before anyone is paid
A written quote. Ask for a presupuesto — itemised written quote, and treat “I don’t do paperwork” as the end of the conversation. The standing advice from OCU, Spain’s main consumer organisation (confirmed August 2026): collect three competing quotes, itemised by trade, with materials specified by brand and model rather than “bathroom tiles”, and with the boring lines included: demolition, waste removal, final clean-up and any municipal permit. A vague quote is not a cheaper quote; it is a quote whose real price has not been revealed yet.
A contract. For anything beyond a day’s work, the accepted presupuesto gets attached to a short contract stating five things: the scope, the start and completion dates, a payment schedule tied to completed stages rather than calendar dates, the process for pricing variations and the treatment of IVA — VAT. On that last point: renovation and repair work on a private home is charged at the reduced 10% rate rather than 21% when three conditions hold, all of them usual in a normal reform: the client is a private individual using the dwelling, the home is more than two years old and materials supplied by the builder do not exceed 40% of the invoice (Article 91 of the VAT law, confirmed August 2026). A builder who prices this correctly without prompting has done legitimate residential work before. One who offers to lose the IVA for cash is announcing that no invoice, and therefore no evidence, will exist.
An invoice. Every payment, the deposit included, gets a factura — legal invoice — carrying the builder’s tax ID (NIF or CIF). Not a WhatsApp message confirming receipt. The factura is what connects your money to a real registered person or company, which becomes the entire game if you ever need the escalation ladder below.
One more line of paper: most terrace, bathroom and kitchen jobs need the town hall told. Since Andalucía’s Decreto-ley 2/2020, most minor works run on a declaración responsable — responsible declaration — filed with the town hall, though some jobs still need a licencia de obra menor — minor works permit, depending on the municipality and the work. The quote should say who files it. A builder who waves the permit question away is transferring that risk to you, and unpermitted work tends to surface at the worst moment, usually when you sell. Our guide to Spain’s habitation certificates covers the paperwork side of that risk.
The three documents to request, and how far each can be checked
1. Liability insurance. Ask about the seguro de responsabilidad civil — public liability insurance. Honesty first: Spain does not impose a single national insurance obligation on every self-employed tradesperson, which is exactly why asking is informative. What a genuine policyholder can produce, usually within a day, is a certificate from the insurer naming the policyholder, the policy number, the coverage limit and the period of cover, plus the latest recibo — premium receipt — showing it has been paid. There is no public register where a consumer can look up someone’s policy, so the check is documentary: certificate plus paid receipt. To go one step further, confirm the insurer itself is authorised via the public registers of the DGSFP, Spain’s insurance supervisor (dgsfp.mineco.gob.es). Builders who work for communities of owners or developers produce this paperwork constantly. Hesitation at the request is itself the answer.
2. Self-employed registration. A sole trader has an alta de autónomo — self-employed registration, and the clean way to show it is the certificado de situación censal — tax-registry certificate: the tax agency, the AEAT, issues it online, free and instantly, to anyone with Spanish digital ID, and it states that the person is registered and for what activity (confirmed August 2026). You cannot look up someone else’s tax status yourself; data protection sees to that. But a legitimate autónomo can download the certificate in the time it takes to make a coffee, so ask for one dated that week. The test is not the paper. The test is whether producing it is easy.
3. Company registration. Dealing with an SL rather than an individual, you can check the company from your sofa: the Registro Mercantil (registradores.org) confirms, for a small fee, that the company exists, is active and names its administrator. Match the administrator and the CIF on the quote to the person in your kitchen. A company that appears nowhere, or whose named administrator is a stranger to your builder, moves the conversation back to square one.
Deposits: the norm and the red flags
The norm on a properly run job is staged payment against completed work: an initial payment on signing, then instalments released as defined stages finish, with a final tranche held until snagging is done. OCU’s guidance (confirmed August 2026) puts the signing payment at no more than 20 to 30% and is blunt about the rest: a firm asking for more than a third up front without a clear reason is a firm to walk away from.
Large upfront “materials” deposits deserve particular suspicion on labour-heavy work. Demolition and tiling consume sweat, not stock. Where genuine made-to-order materials exist (windows, kitchen units, custom glazing), the clean arrangements are payment against the supplier’s order confirmation, or paying the supplier directly.
Note what the La Cala case says about percentages: €2,000 on a €10,000 job is 20%, inside the respectable band. The number was never the problem. With no contract, there was no stage for the payment to attach to, no completion date to miss and no paper trail to enforce. A correct percentage handed over on a handshake is still a handshake.
What work costs in 2026
Sanity bands, not quotes. These are national market averages published by the large Spanish reform platforms, confirmed August 2026, and they screen for outliers in both directions.
- A full bathroom reform averages around €5,500 nationally, with the common range running €2,500 to €12,500 by size and specification. A standard 4 to 6 m² bathroom at mid-range quality typically lands between €5,000 and €8,000.
- Tiling runs roughly €14 to €38 per m² depending on material and format, with around €25 per m² a fair midpoint. Exterior floor tiling, terrace work included, sits around €30 per m².
A quote far below band is a louder warning than one above it. Cheap is how the hook is baited; the loss arrives later, as the La Cala couple’s €8,000 to €10,000 re-do priced in.
The same sanity-check habit applies one layer up, to the gestores — administrative agents — and lawyers who orbit building and residency paperwork. Another reader report from December 2025: a lawyer quoted €1,480 for a five-year TIE renewal. The government fee for that card, paid on form Modelo 790-012, is €21.87 (confirmed August 2026). There is legitimate professional work in a renewal, but not €1,458 of it. Our guides on TIE renewal, finding and keeping a good gestor and delegating to one safely cover what honest help costs.
If it goes wrong: the ladder
Four rungs, cheapest first. The paperwork from the earlier sections is the ammunition for all of them.
1. The complaint form. Every business selling goods or services in Andalucía must hold and hand over the official hoja de reclamaciones — complaint form — on request, immediately and free (Decreto 82/2022, confirmed August 2026). Asking for it mid-dispute has a way of changing the temperature of a conversation. Filed, it reaches the consumer authorities, and your OMIC — municipal consumer office — can attempt mediation: in Málaga city the OMIC sits at Paseo Antonio Machado 12 (951 926 057, weekday mornings 9:00 to 13:00); other town halls run their own. For orientation, the Junta de Andalucía’s free Consumo Responde line on 900 21 50 80 answers Monday to Saturday, though it takes questions rather than filings.
2. The burofax. The formal demand letter in Spain is a burofax — certified letter with legal proof of content and delivery, sent from any Correos office or online. One page with content certification and delivery receipt costs about €13; premium variants with long-term custody run to €36 (confirmed August 2026). State what was contracted, what failed, the amount demanded and a deadline. This is not theatre: since 3 April 2025 a civil lawsuit must show a documented attempt to settle before filing (Ley Orgánica 1/2025), and for a consumer claim a documented prior demand of exactly this kind does the job. A burofax the recipient refuses to collect still counts. Keep everything.
3. The court claim. Money claims up to €15,000 go through juicio verbal — Spain’s simplified civil procedure. The threshold was raised from €6,000 with effect from 20 March 2024, which quietly moved most botched-reform disputes into the simpler track (confirmed August 2026). Below €2,000 you can file and appear without a lawyer or procurador — court agent; above €2,000 both are required, so on a claim the size of the La Cala couple’s, budget for representation and ask your lawyer about recovering costs.
4. The police report. There is a line where a bad job becomes a crime. If the builder demolishes, collects and vanishes, taking a deposit with no intention of doing the work, file a denuncia — police report — at the Policía Nacional or Guardia Civil with your quotes, receipts, messages and the burofax file. The criminal route runs in parallel with the civil claim, not instead of it, and a pattern of denuncias is how serial operators eventually meet a courtroom.
The red-flag catalogue
- Cash only, no factura, or a discount for dropping the IVA. No invoice means no evidence, which is the point.
- No written quote, or a one-line quote for a five-figure job.
- A large upfront deposit on labour-heavy work, or materials money with no supplier order to show for it.
- Charm plus urgency: “the crew is free next week, but only if you commit today”. Competent builders on the Costa are booked, not desperate.
- August pressure, the seasonal version of the same move: everything shuts, so sign now. A genuine firm will still exist in September.
- No traceable footprint: mobile number only, no address, no NIF on anything.
- Visible discomfort at the hoja de reclamaciones, the insurance certificate or the situación censal request. Watching how the question lands is the cheapest vetting tool on this page.
The engineering under most of these is the same as the phone scams we have covered before: manufactured authority plus manufactured urgency, aimed at moving money before checking starts. Our guide to the fake tax-agency calls dissects the mechanics.
Ask it in Spanish
Five sentences that do the vetting for you. Delivery matters less than the paper they produce.
- ¿Me puede dar un presupuesto por escrito? — Can you give me a written quote?
- ¿Tiene seguro de responsabilidad civil? ¿Me enseña el recibo? — Do you have liability insurance? Can you show me the receipt?
- ¿Está dado de alta como autónomo? — Are you registered as self-employed?
- La factura, con IVA, por favor. — The invoice, with VAT, please.
- Los pagos, por fases, contra trabajo terminado. — Payments in stages, against finished work.
The five-minute version
- Facebook groups are for collecting names and avoid-warnings. Vetting starts after the shortlist, and a recommendation validated in three groups can still be one echo.
- Before money moves: an itemised written presupuesto, a contract with staged payments and dates, and a factura with a tax ID for every payment including the deposit. The 10% reduced IVA applies to most owner-occupied home reforms; an offer of no IVA for cash removes your evidence.
- Request three documents: the liability-insurance certificate plus paid receipt, a fresh certificado de situación censal for a sole trader, or a Registro Mercantil check for a company. Ease of production is the real test.
- Deposits: 20 to 30% on signing at most, staged thereafter. OCU’s line is that more than a third up front without a clear reason means walk away. A good percentage without a contract protects nothing.
- If it fails: hoja de reclamaciones and the OMIC, then a burofax demand (about €13, and since April 2025 that documented demand is also your ticket into court), then juicio verbal up to €15,000 (no lawyer needed under €2,000), and a denuncia when it was fraud rather than failure.
Related guides
- Good Gestor Costa del Sol: How to Find and Keep One
- Delegating to a Gestor Safely in Spain (2026): Apoderamiento vs Handing Over Your Digital Certificate
- AEAT Le Llamamos Phone Number: Fraud Red Flags
- Is the Costa del Sol Safe? Crime, Scams and What to Watch For
- TIE Renewal in Spain 2026: What Actually Changed (and What Catches People Out)
- Licencia de Primera Ocupación & Cédula de Habitabilidad: Spain’s Habitation Certificates Explained
General information, not legal advice, current as of 10 August 2026. Primary sources: Ley de Enjuiciamiento Civil arts. 23, 31, 249 and 250 as amended by Real Decreto-ley 6/2023 (in force 20 March 2024); Ley Orgánica 1/2025 on pre-suit settlement attempts; Ley 37/1992 art. 91.Uno.2.10º on reduced IVA for home renovation; Decreto 82/2022 of the Junta de Andalucía on complaint forms (BOJA); Andalucía’s Decreto-ley 2/2020 on responsible declarations for minor works; the Modelo 790-012 fee schedule; OCU guidance on contracting building work; and 2026 price data from national reform platforms. Reader reports from December 2025 are used with details anonymised.
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