How do you check asbestos, radon and contaminated land before buying?

Which checks should come first for the property you want?

Before commissioning a bundle of tests, establish what you are buying and how you will use it. Mark the house, agricultural buildings and land on a plan. Ask the seller about former activities, buried tanks, removed building materials and environmental proceedings. An agent's description of a building as an old farmhouse tells you little about what happened in its yard.

Asbestos is a building-material or waste question. Radon is a naturally occurring radioactive gas that can accumulate indoors. Contaminated-land rules concern hazardous substances from human activities and the risk associated with using the land. Passing a check for one does not answer the others.

For an empty plot, start with the history and discarded materials. Radon zoning will inform a future building design; it cannot certify indoor air in an unbuilt house. For an existing home, identify the rooms you will occupy and any work needed.

In Spain the ayuntamiento is the town hall. It holds the municipal asbestos census and handles the local building enquiry. The comunidad autónoma, the regional government, handles the contaminated-land procedure. Your own lawyer should coordinate those records with the title and technical findings; do not leave the entire enquiry to the seller's builder.

What evidence should you obtain about possible asbestos?

Ask the town hall for the censo de instalaciones y emplazamientos con amianto, its asbestos-site census, and the removal calendar for the property. Give the address and parcel details. Additional provision fourteen of Ley 7/2022 required town halls to prepare both within a year of the law taking effect and makes them public. If nothing is listed, ask whether the property was inspected or simply has no entry.

The census is a starting point. Ministry of Health guidance distinguishes locating suspect materials, identifying them and assessing their condition and risk. A photograph of a corrugated roof may warrant inspection; it does not establish the material's composition or condition. Have the assessor include outbuildings, pipes, tanks and debris, and record inaccessible areas.

Spain prohibited asbestos use and marketing in 2002. That did not remove it from existing buildings. Previously installed material's continued presence depends on its useful life and condition, rather than a guaranteed lifespan. Do not drill a suspect roof, pressure-wash it or break off your own sample. Let a suitable specialist arrange identification and any sampling.

The national law's before-2028 requirement concerns the higher-risk public installations or sites. It is not a blanket deadline to remove every private roof. For the house you want, obtain the applicable schedule, assessment and any specific instructions. Equally, that date is no reason to postpone assessing damaged private material.

For an ordinary contracted asbestos-roof removal, obtain proof that the firm is on the asbestos-risk contractors’ register (RERA) and request the approved work plan applicable to the job. RD 396/2006 covers identification before demolition or maintenance, work plans, their approval and registration (articles 10.2, 11, 12 and 17). Being on RERA is not evidence that the job's plan has been approved.

What changed in Catalonia in October 2026?

Catalan Ley 8/2026 generally took effect on 3 October 2026. Article 21 requires delivery of an asbestos-presence or absence certificate when a property is sold or let. The Agència de Residus de Catalunya says this applies to properties predating 2002 and provides a basic certificate model pending implementing rules.

The minimum scope concerns visible asbestos, its condition and risk. It does not establish that concealed material is absent. The Agency identifies the technical professions able to issue it within their competences. Check that the document covers what you are buying: a certificate for an individual unit does not automatically cover the whole estate.

Article 3 covers Catalan public authorities; entities based or economically active in Catalonia that own assets there; and individuals who live or provide services in Catalonia and own assets there. If an owner is non-resident, have your lawyer and notary establish how the transaction falls within that scope. Do not assume an exemption. They should also check the registration provision in additional provision seven, separate from the national declaration about potentially polluting land uses.

The certificate is only part of the owner's duties. Article 11 also requires reporting known asbestos to the authority and, once identified, taking the measures needed for its removal under the law. Before buying, establish the required action and timetable with the assessor and authority, and agree who bears the cost.

How do you find the property's radon zone in DB HS6?

The Código Técnico de la Edificación (CTE) is Spain’s Building Code. DB HS6 is its radon-protection section. Open the current official DB HS document, find section HS 6 and its appendix B. Look up the province, then the actual municipality and the zone I or II column. A village, postal address or residential development may have a different name from the municipality governing the parcel. Ask the town hall if that identity is unclear.

The list works municipality by municipality. Do not assume a whole region is free of risk, whether Andalusia, the Valencia region, Murcia, Catalonia, the Balearics or the Canaries, based on a general impression about geology. The national rules described here sit alongside the regional and municipal procedures for your proposed work.

The nuclear safety authority, CSN, publishes radon information and mapping, but expressly says maps cannot replace direct measurements. A municipality missing from appendix B is not a favourable test result for the house.

DB HS6 applies in listed municipalities to new buildings and specified interventions. For an extension it covers the new part. Changes of use affect the building or the relevant part, depending on the change. Refurbishment is covered in the affected area where modifications allow better protection or alter the original protection. Buying an existing house is not itself one of those building interventions. Ask your designer to justify the scope for a basement conversion, a store becoming accommodation or a floor replacement.

The prescribed zone I route is a gas barrier, with a ventilated air chamber as an alternative subject to its construction conditions. Zone II combines the barrier with a ventilated containment space or ground depressurisation. A cavity below the floor may not meet the specification.

For work on an existing building, measured results can also determine the route. Under section 3, paragraph 4, if appendix C annual averages are available and a sampling zone exceeds 300 Bq/m³, results above 300 and up to 600 Bq/m³ call for zone I solutions; results above 600 Bq/m³ call for zone II solutions. Have the designer apply that rule where relevant and justify any alternative.

Non-habitable rooms have a specific exclusion under DB HS6. This does not grant permission to turn them into a home. If your purchase depends on conversion, check what the planning rules allow you to build or alter alongside the environmental work.

What radon test can you rely on before committing?

The reference level is 300 Bq/m³ as an annual average in indoor air in habitable rooms. It is not a soil-gas reading, and being below it does not certify zero risk. A brief reading during a viewing does not establish that annual average.

If you need to investigate the home, use an entity accredited for measuring radon in air and ask it to confirm compliance with appendix C. Have the professional determine the rooms, detector locations and numbers, giving attention to the lower occupied floors and rooms such as bedrooms and living rooms.

Appendix C specifies at least two months of detector exposure, followed by analysis and the annual-average estimate. Occupied homes retain ordinary habits during exposure. In an empty building the protocol calls for closed-building conditions as far as possible, with internal doors open. Existing protective systems operate normally. Agree these arrangements with the seller before placing detectors.

The report should identify detector locations on a plan, exposure dates, results and uncertainty.

If protection needs improvement, obtain a feasible design, a quotation and verification afterwards; opening windows for a viewing is not evidence of a satisfactory permanent solution.

This timetable can matter more than the laboratory's price. If the proposed deposit date comes before the evidence you need can be obtained, negotiate the dates or an express contractual condition. A promise to test after completion leaves you making the decision without the result.

When is a soil-status report required?

Investigate former workshops, substance storage and waste operations. Annex I of RD 9/2005 lists potentially polluting activities, some subject to qualifications. Do not classify every repair workshop solely by its name. Stained ground, tanks or suspicious fill are reasons to investigate; they are not an official finding of contaminated land.

An informe de situación is a site-status report submitted to the regional environmental authority. Operators of activities within the rules have reporting duties. The authority can require more detailed information or analysis and sets the applicable periodic report content and frequency. Obtain the reports, filing receipts and subsequent correspondence. A receipt only shows submission.

For an owner of land with a former potentially polluting activity, article 3.5 of RD 9/2005 requires a site-status report when applying for a licence or authorisation for a different, non-potentially-polluting activity or a change of land use. The purchase alone is not that trigger. If your plan is to turn a former industrial building into a home, establish the file's position before committing to that project.

A preliminary report is not necessarily a sampling investigation. Annex II expressly allows it to be prepared without specific testing. Have an environmental specialist assess whether the records suffice or a targeted investigation is needed. Agree access and sampling permission with the seller first.

Identify the parcel and intended use in your enquiry to the regional authority. Ask for outstanding reports, proceedings, recovery decisions and the uses accepted after recovery. The filing procedure must be checked locally; a form used for another region is not a reliable guide to your property's requirements.

What do the Land Registry notes mean, and who pays for cleanup?

Under article 98.3 of Ley 7/2022, the owner must declare in the transfer document whether a potentially polluting activity has occurred. The declaration receives a nota marginal, a marginal entry in the Land Registry. It is the owner's statement, not an analytical certificate. When reviewing the nota simple, the Land Registry information extract, distinguish:

• An activity declaration: records the stated history without itself declaring the land contaminated.
• Commencement of proceedings: warns that a procedure has opened, before its final decision.
• A declaration of contaminated land: follows an express regional decision, whose boundary and requirements need examination.

Article 99.1 assigns that declaration to the regional authority. It can suspend building or other use rights incompatible with recovery measures (article 99.4). Before work starts in an area declared or delimited as contaminated land, the promoter, the person commissioning the work, must also hold a Land Registry certificate confirming the relevant contamination entry. Have your lawyer obtain it; a nota simple does not replace this requirement.

Cancellation of the declaration note requires the regional decision confirming satisfactory recovery (article 99.5). The maximum decision period is six months from submission of the supporting recovery report. If that period expires without notification of an express decision, the application is deemed rejected. Silence does not establish clearance. Set the contract’s conditions and dates with this procedure in mind.

RD 9/2005 gives the note commencing proceedings a five-year expiry under article 8.2. Cancellation of the contaminated-land declaration is a different matter under article 8.3. An expired commencement note does not prove the ground was cleaned up. Ask for the actual decision and the file's current status. A missing warning or the seller's negative activity statement cannot establish physical absence of pollutants.

Under article 100.2, parties with subsidiary liability can claim their recovery costs from the polluter. Ask your lawyer who could be pursued and whether payment can be secured. Article 100.4 limits the responsible party’s cleanup duty to the standards for the land use when pollution occurred; extra measures required by a new use fall to its promoter.

Do not accept a recovery approved for industrial use as proof that housing is acceptable. Your lawyer and specialist need to compare the approved use with your proposed use. Budget for establishing and achieving the required suitability, rather than assuming the only expense is excavating soil.

What should be settled before you pay the deposit?

The Spanish arras contract is the private purchase agreement commonly used when paying a deposit. In your arras agreement, specify the missing evidence and the findings that permit the purchase to proceed. Agree access, who pays for investigations, what happens if results arrive late and how money is returned if the conditions fail. For work promised by the seller, define completion evidence and financial security. Do not assume you have an automatic cost-free exit.

Do not pay the deposit yet if…

• You are refused access to assess suspect roofing or measure the home you need checked.
• The purchase depends on conversion without a review of radon protection and the site's environmental position.
• A former activity or marginal note remains unexplained by the relevant records and decisions.
• Asbestos removal or soil recovery is promised without defined scope, cost and completion evidence.
• The contract's deadline precedes the necessary evidence and no refund conditions have been agreed.