How to Check a Builder in Portugal Before You Hire Them

A practical checklist for checking a builder in Portugal, including IMPIC registration, insurance, references, quotations, contracts and staged payments.

Published 25 August 2026 · 12 minute read · By Luke Barry

Choosing a builder in Portugal should involve more than comparing photographs and accepting the lowest quotation. The person or company taking responsibility for the work should be identifiable, appropriately authorised for the project, adequately insured and willing to explain the scope in writing.

For overseas owners, the risk is often increased by distance, language and unfamiliar procedures. A professional-looking social profile is useful marketing, but it is not proof of legal identity, construction authorisation or suitable insurance.

This practical checklist explains the checks to make before paying a deposit for renovation or building work in Portugal.

This article provides general information, not legal, tax or technical advice. Requirements depend on the project, contract value, municipality and activity. Confirm the current position with the relevant Portuguese authority and qualified advisers.

1. Define the project before assessing builders

A builder cannot price or prove suitability for a job that has not been defined. Write down the rooms, finishes, structural alterations, services and external works involved. Record who is expected to provide drawings, permissions, materials, waste removal, testing and certification.

For substantial work, obtain drawings or a written specification from an appropriate Portuguese professional. Send the same information to every contractor. Quotations based on different assumptions cannot be compared fairly.

2. Confirm the contracting identity

Ask for the full legal name of the person or company that will sign the contract and issue invoices. Record its Portuguese tax number, registered address and contact details. The name should be consistent across the quotation, contract, invoice, insurance evidence and payment account.

Be cautious if the person selling the work says another company will invoice, requests payment to an unrelated personal account or refuses to identify who carries contractual responsibility.

3. Check the appropriate IMPIC authorisation

Portugal regulates access to construction activity through IMPIC, the Instituto dos Mercados Públicos, do Imobiliário e da Construção.

Depending on the work and value, the responsible construction business may need an Alvará de Empreiteiro de Obras Particulares or a Certificado de Empreiteiro de Obras Particulares. IMPIC currently states that the private-works certificate covers qualifying private works up to €40,000 excluding VAT. An Alvará operates by authorised class and categories, with the class linked to the value of work the business can undertake.

Do not rely only on a number printed on a quotation. Search the current IMPIC register and check:

• The holder’s legal name
• Whether the title remains current
• Whether it covers private works
• The authorised class and relevant categories
• Whether the project value fits the authorisation

IMPIC also publishes information about cancelled titles. For a complex project, ask the designer or project manager to confirm that the contractor’s authorisation covers the intended responsibility.

4. Establish what municipal permission is required

Contractor authorisation does not replace project approval. Structural alterations, extensions, changes of use, demolition and some external changes can involve municipal licensing or prior communication. The position depends on the work and property.

Before signing, ask in writing:

• Does the project require licensing, prior communication or another municipal process?
• Who will prepare and submit the documents?
• Who is the responsible designer and technical director?
• What inspections and completion documents are expected?
• Is work allowed to begin now?

If the answer is simply “nobody checks”, obtain independent professional advice.

5. Verify insurance

Ask for current insurance evidence covering the actual legal contractor and proposed activity. Do not accept a cropped screenshot that hides the insured name, period or exclusions.

Depending on the project, relevant cover can include workplace-accident insurance, public liability, contract works, existing structures, tools and equipment. IMPIC’s published requirements include appropriate workplace-accident insurance in relevant circumstances.

For a high-value renovation, ask your own insurance adviser whether the property policy needs notification before work starts.

6. Check comparable work and references

Photographs demonstrate appearance, not necessarily responsibility or long-term performance. Ask for two or three recent projects with similar scope and budget. With the customer’s permission, discuss communication, attendance, variation control, cleanliness, delays and how defects were handled.

Ask what the contractor personally completed and what was subcontracted. A company experienced in cosmetic apartment refurbishments is not automatically suitable for structural villa alterations.

7. Compare complete written quotations

A useful quotation should identify the customer, property, contractor and precise scope. It should separate labour, materials, VAT and provisional items where practical.

Look for:

• Quantities, brands or performance standards
• Preparation and protection work
• Demolition and disposal
• Electrical, plumbing and other specialist work
• Scaffolding, access and equipment
• Municipal or professional fees
• VAT treatment
• Start assumptions and estimated programme
• Payment stages
• Exclusions

A cheap quotation may simply omit work that another contractor has included.

8. Understand VAT and invoicing

Ask whether prices include Portuguese VAT and request a lawful invoice for every payment. Reduced VAT treatment is not automatic merely because a property is old or work is described as renovation. The nature of the supply and current legal conditions matter.

The contractor or accountant should explain the proposed treatment clearly. Never agree to an undocumented cash arrangement on the assumption that it protects you from tax or contractual risk.

9. Use a written contract

For meaningful work, the contract should state the parties, property, scope, documents, price, VAT, programme, payment stages, insurance, permissions, variation process, suspension rights, completion evidence and procedure for defects or disputes.

Where the contract is in Portuguese and you do not understand it fully, obtain an independent translation or legal review. Do not rely on a verbal summary provided by the party asking you to sign.

10. Link payments to genuine progress

A deposit may be reasonable for mobilisation or specially ordered materials, but it should be proportionate and explained. Later payments should correspond to measurable stages rather than arbitrary dates.

Before each stage payment, confirm what has been completed, what remains outstanding and whether relevant materials are actually delivered for your project. Retaining an agreed final balance until completion and handover can help ensure small outstanding items are resolved.

Never pay simply because the contractor says another customer is waiting or a supposed discount expires that day.

11. Control changes in writing

Renovations reveal surprises, but that does not justify uncontrolled pricing. Agree that variations must identify the change, reason, price and effect on timing before the additional work proceeds, except where immediate action is genuinely required for safety.

Keep decisions, photographs, invoices and approvals together. This is especially important when you manage an Algarve property from outside Portugal.

12. Plan completion and handover

Completion is more than the last worker leaving. Agree what you will receive: keys, warranties, manuals, certificates, testing records, invoices, photographs of concealed services and any municipal or professional completion documents.

Inspect the work against the written scope and record incomplete or defective items. Agree a reasonable correction period and retain the records after final payment.

Warning signs

Take extra care if a contractor:

• Refuses to provide a legal identity or IMPIC details
• Pressures you to pay immediately
• Requests payment to an unrelated account
• Will not issue invoices
• Dismisses permits without reviewing the project
• Provides only generic photos and no relevant references
• Gives a price without a written scope
• Demands a very large advance with no explanation
• Wants every variation agreed verbally
• Claims a directory badge guarantees the work

What TrustedTradesPortugal verification means

A directory can make initial research easier by organising business details, services and verification evidence. It cannot predict future workmanship or replace project-specific checks.

Homeowners should still confirm current IMPIC authorisation, insurance, references, permissions, quotation and contract for the actual project. Verification supports a shortlist; it does not make the final decision for you.

Use the TrustedTradesPortugal directory to begin your search, then apply the checks above before appointing anyone.

Final checklist

Before paying a deposit, confirm that you have:

• Identified the legal contractor
• Checked the relevant IMPIC register
• Confirmed the authorisation covers the work and value
• Established the municipal and professional requirements
• Reviewed current insurance evidence
• Spoken to recent comparable customers
• Compared a complete written scope
• Understood VAT and invoicing
• Signed an appropriate contract
• Linked payments to progress
• Agreed variation and handover procedures

Official sources

• IMPIC: private-works contractor register
• IMPIC: access to construction activity
• IMPIC: construction activity FAQs