Buying Property in Castelldefels and Gavà Mar in 2026: A Step-by-Step Guide for Foreign Buyers

Buying property in Spain in 2026 remains a highly attractive option for international buyers, especially in coastal residential areas close to Barcelona. For many foreign clients, Castelldefels, Gavà Mar and Les Botigues de Sitges offer the ideal combination of Mediterranean lifestyle, proximity to Barcelona, access to the airport, international schools, beachside living and strong long-term value.

At the same time, buying a property in Spain requires more than choosing a beautiful home. The process involves legal checks, tax planning, technical review, notarial formalities, registration and practical post-purchase arrangements. This is particularly important for buyers who live abroad and are not familiar with the Spanish system.

In 2026, foreign buyers can still purchase property in Spain, regardless of nationality, although mortgage conditions, tax treatment and administrative steps may vary depending on the buyer’s residence status, financing structure and the type of property being acquired.

For this reason, a safe purchase in Spain should be planned step by step, with a clear understanding of the legal, financial and local market aspects involved.

Why buy in Castelldefels, Gavà Mar or Les Botigues de Sitges?

Castelldefels, Gavà Mar and Les Botigues de Sitges are among the most desirable residential areas on the Barcelona coast. They attract international families, executives, entrepreneurs, digital professionals and buyers looking for a second home close to Barcelona but away from the density of the city centre.

Castelldefels is especially attractive for families who want year-round living near the beach, good transport connections and access to international schools. Gavà Mar is known for its exclusive residential atmosphere, larger homes, privacy and proximity to both the airport and Barcelona. Les Botigues de Sitges offers a quieter coastal setting with access to the Garraf area, while still being connected to Castelldefels, Sitges and Barcelona.

For foreign buyers, these locations can serve different purposes. Some clients are looking for a permanent family home, others want a second residence, and many buyers are interested in a property that can later be used for medium-term rental, relocation clients or carefully managed investment purposes. The intended use of the property should be considered from the very beginning, because it affects the legal checks, financing, tax planning and rental strategy.

Step 1: Define your purpose before choosing the property

Before starting the property search, the buyer should clearly define why they are buying. A property intended as a family home will be assessed differently from a property purchased as a second residence or a future rental asset.

If the property is intended for personal use, the most important factors may be lifestyle, school access, public transport, beach proximity, noise levels, parking, community facilities and year-round comfort. If the property is intended as an investment, the buyer should also analyse rental demand, local restrictions, property management costs, community rules and the likely profile of future tenants.

In Castelldefels and Gavà Mar, this distinction is particularly important because demand comes from several different groups. Families relocating to Barcelona often search for well-maintained homes near schools and transport. Professionals may prefer apartments or houses with easy access to the airport and Barcelona. International owners looking for a second home may prioritise privacy, sea views, outdoor space and reliable property management while they are abroad.

Step 2: Understand your real budget

The advertised price of a property in Spain is not the total cost of buying. In addition to the purchase price, the buyer must budget for taxes, notary fees, land registry fees, legal support, banking costs and, where relevant, mortgage-related expenses.

In Catalonia, second-hand residential property purchases are generally subject to Property Transfer Tax, known as ITP. From June 2025, Catalonia introduced a progressive ITP structure, with rates of 10% up to €600,000, 11% between €600,001 and €900,000, 12% between €900,001 and €1,500,000, and 13% above €1,500,000. A 20% rate may apply in specific cases involving large property holders or the acquisition of entire residential buildings.

For new-build residential properties purchased from a developer, the buyer generally pays 10% VAT and AJD stamp duty, which in Catalonia is commonly 1.5% for this type of transaction.

Because tax rules can change and reduced rates may apply in specific circumstances, buyers should confirm the applicable tax treatment before signing a binding agreement. This is especially important in the Barcelona coastal market, where property prices can fall into higher tax brackets.

Step 3: Obtain your NIE number

Every foreign buyer needs a Número de Identidad de Extranjero, commonly known as the NIE. This is the identification number used by foreigners in Spain for tax, property, banking and administrative purposes.

The NIE is required for signing the purchase deed, paying taxes, opening a Spanish bank account, registering ownership and setting up utilities.

Foreign buyers can usually apply for the NIE either through a Spanish consulate abroad or in Spain through the relevant police office. In many cases, the process can also be handled through a representative with a power of attorney. Starting this step early is strongly recommended, because appointment availability and processing times can vary.

Step 4: Consider financing and mortgage options early

Foreign buyers can apply for a Spanish mortgage, including non-resident buyers, although banks usually assess non-resident applications more cautiously. The amount financed, documentation required and approval timeline may differ from those available to Spanish residents.

A non-resident buyer will normally need to provide proof of income, tax returns, bank statements, credit information and details of existing assets and liabilities. If the buyer’s income is in a currency other than euros, the bank may also consider exchange-rate risk.

Mortgage planning should begin before signing a binding deposit contract. If financing is needed, the buyer should know how much the bank is likely to lend, how long approval may take and whether the purchase timeline is realistic. In some cases, the deposit contract should include carefully drafted conditions related to mortgage approval, but this must be reviewed by a legal professional before signature.

Step 5: Carry out legal and technical due diligence

Before committing to the purchase, the buyer should verify the legal and technical status of the property. This is one of the most important stages of the process.

The first document to review is usually the nota simple from the Registro de la Propiedad, which provides key information about the property. It identifies the registered owner, describes the property, and shows whether there are mortgages, embargoes, easements or other charges affecting it.

In addition to the nota simple, the buyer should check the cadastral information, the energy performance certificate, the latest property tax receipts, community fee status, possible debts with the community of owners, and whether any building works or extensions were properly authorised.

The technical condition of the property should also be assessed. This is particularly relevant for older houses, beachfront properties, villas with pools, homes exposed to humidity or sea air, and properties located in communities with shared structures. A technical inspection can help identify issues related to damp, structure, installations, roofing, drainage, energy efficiency, air conditioning, heating or hidden maintenance costs.

For foreign buyers who cannot attend every visit in person, a trusted local representative can carry out viewings, coordinate inspections and report on the real condition of the property and its surroundings.

Step 6: Check the community of owners

Many properties in Spain form part of a comunidad de propietarios, or community of owners. This may apply not only to apartments, but also to townhouses, villas in residential complexes and properties with shared gardens, pools, garages or access roads.

Before buying, the buyer should review whether the seller is up to date with community payments and whether the community has approved any extraordinary expenses. This is important because planned façade repairs, roof works, lift replacements, pool renovations or structural interventions can create future costs for the new owner.

The buyer should also understand the community rules. If the buyer intends to rent the property in the future, community rules should be checked before signing the purchase contract.

Step 7: Reserve the property

Once the buyer has selected a property and agreed the main commercial terms, the parties may sign a reservation agreement. This is usually a short document confirming the property, the price, the buyer and seller details, and the amount paid to reserve the property.

The reservation payment is often lower than the later deposit under the contrato de arras, but the legal effect depends on the wording of the document. For this reason, even a reservation agreement should be reviewed carefully before payment.

Step 8: Sign the contrato de arras

The contrato de arras is one of the most important documents in a Spanish property purchase. It is the private deposit agreement that sets out the main terms of the transaction before completion at the notary.

In many cases, the buyer pays around 10% of the purchase price when signing the contrato de arras. The agreement normally states the purchase price, payment structure, deadline for completion, obligations of the buyer and seller, and consequences if either party fails to complete.

The most common structure is arras penitenciales, where the buyer may lose the deposit if they withdraw without valid reason, while the seller may have to return double the deposit if they withdraw.

For international buyers, the contrato de arras should reflect practical realities such as NIE timing, mortgage approval, power of attorney, availability for notarial signature and document preparation.

Step 9: Prepare for completion before the notary

The purchase is completed before a Spanish notary through the signing of the public deed of sale, known as the escritura pública de compraventa. At this moment, ownership is transferred to the buyer, subject to payment and completion of the formal requirements.

Before the notarial signing, the buyer’s legal representative normally reviews the updated registry information, confirms the seller’s authority to sell, checks the payment of local property tax and community fees, verifies the purchase price and payment method, and coordinates with the bank if a mortgage is involved.

The notary plays an important role in formalising the deed and verifying the legal identity and capacity of the parties, but the notary does not replace the buyer’s independent adviser. The buyer’s interests should be protected before the notarial stage, especially during due diligence and contract negotiation.

If the buyer cannot attend the notary in person, they may grant a power of attorney to a trusted representative. This is common for foreign buyers who live outside Spain and want the transaction to proceed without repeated travel.

Step 10: Pay taxes and register the property

After completion, the buyer must pay the applicable taxes within the legal deadline and register the purchase deed at the Registro de la Propiedad. Registration is essential because it protects the buyer’s ownership rights against third parties.

The correct Property Registry depends on the municipality where the property is located. For properties in Castelldefels, the relevant registry is Registro de la Propiedad de Hospitalet 4, for properties in Gavà Mar, the relevant registry is Registro de la Propiedad de Gavà, for properties in Les Botigues de Sitges, which forms part of the municipality of Sitges, the relevant registry is generally Registro de la Propiedad de Sitges Nº 01.

Step 11: Transfer utilities and organise ownership after purchase

After the purchase is signed, the new owner must organise the practical side of ownership. This usually includes transferring electricity, water, gas, internet, community payments, local property tax arrangements and insurance.

For owners who do not live permanently in Spain, this stage is often more complicated than expected. Utility companies may require Spanish contact details, bank account information and documentation proving ownership. Community administrators may also need updated owner information and direct debit details.

If the property will be used as a second home, the owner should also arrange key holding, maintenance checks, cleaning, garden or pool care, alarm systems and emergency contact support. If the property may later be rented, the owner should prepare a rental strategy that complies with applicable national, Catalan, municipal and community rules.

This is where a local agency can add significant value, especially for owners who live abroad.

Why work with CASTAVA when buying property?

Buying property in Spain is not only a legal transaction. It is also a lifestyle, investment and management decision. The right property must fit the buyer’s personal goals, budget, family needs and long-term plans.

CASTAVA helps international buyers in Castelldefels, Gavà Mar, Les Botigues de Sitges and the Barcelona coastal area understand the local market, compare neighbourhoods, organise viewings, coordinate with legal and tax professionals, review the practical aspects of ownership and prepare the property for future use.

Our role is to guide the buyer through the local reality of the market. We help clients understand not only what a property looks like, but also how it will function after purchase. This includes questions such as whether the location works year-round, whether the property is suitable for relocation clients, whether maintenance will be easy to manage, whether community rules may affect use, and whether the property has realistic long-term potential.

For buyers living abroad, CASTAVA can also help coordinate the practical steps that come after completion, including property preparation, maintenance, tenant search, relocation support and property management.

We provide support at every stage

If you are planning to buy a property in Castelldefels, Gavà Mar, Les Botigues de Sitges or the Barcelona coastal area, CASTAVA can help you find the right property, understand the process and organise the practical steps with a professional, local and international approach.