Off-Plan vs Resale: ROI Comparison for Costa del Sol Property

Two Paths to Property Investment on the Costa del Sol

Every property investor on the Costa del Sol faces a fundamental choice: buy off-plan (pre-construction or under construction) and wait for completion, or buy resale (an existing property) and start earning immediately. Both strategies have generated strong returns in recent years, but they carry different risk profiles, cash flow patterns, and management requirements. Understanding these differences is essential to choosing the right approach for your circumstances.

In this analysis, we compare both strategies using real market data from the Costa del Sol in 2026, including specific pricing, yield calculations, and risk assessments.

Off-Plan: The Capital Appreciation Play

How Off-Plan Pricing Works

Developers typically launch new projects at Phase 1 prices that are 10-20% below the expected completed value. This discount compensates buyers for the risk and inconvenience of waiting 18-30 months for delivery. As construction progresses and units sell, prices increase through phases — Phase 2 might be 5-8% higher than Phase 1, and Phase 3 another 5-8% above Phase 2.

Real example (Estepona, 2024-2026): A two-bedroom apartment in a new development was offered at Phase 1 in mid-2024 at €285,000. By Phase 2 (late 2024), remaining units were priced at €310,000. Phase 3 (mid-2025): €335,000. Completion in late 2026, with the developer's final units priced at €355,000. A Phase 1 buyer has seen a paper gain of €70,000 (24.6%) before even receiving the keys — and the property hasn't been lived in or rented yet.

The Payment Terms Advantage

Off-plan purchases require only 20-30% of the purchase price during construction, with 70-80% due on completion. This creates leverage that amplifies returns:

• Purchase price (Phase 1): €285,000
• Initial payment (30%): €85,500
• Value at completion: €355,000
• Paper gain: €70,000
• Return on capital deployed: €70,000 / €85,500 = 81.9% return on the capital actually invested

Of course, you still owe the remaining 70% (€199,500) at completion — either from savings or a mortgage. But during the 18-24 month construction period, your €85,500 generated a return that dramatically outperforms any conventional investment. The remaining capital could have been earning returns elsewhere in the interim.

Off-Plan Risks

The potential rewards are substantial, but so are the risks:

Construction delays: Spanish construction projects frequently run 3-6 months behind schedule, and delays of 12+ months are not unheard of. During this period, you earn no rental income, cannot live in the property, and may face mortgage offer expirations that require re-application. Your contract should include delay penalty clauses (typically 0.05-0.1% of the price per day), but enforcing these against a developer can be difficult.

Developer insolvency: Although much rarer since the 2008 crash, developers can still fail. The critical protection is the bank guarantee (aval bancario) required under Spanish law. This guarantee means that if the developer cannot deliver the completed property, you can recover all payments made. Never purchase off-plan without written confirmation of the bank guarantee from the guaranteeing bank.

Specification changes: What's built may differ from what was shown in the marketing suite. Materials may be substituted, layouts slightly altered, and communal areas scaled back. Review the memoria de calidades (specification document) in detail, and ensure your contract references specific brands and specifications rather than generic descriptions.

Market risk: If the market declines during the construction period, you may complete on a property worth less than you paid. In a severe downturn, you might be tempted to walk away — but you'd lose your 30% deposit and the bank guarantee only protects against developer default, not buyer's remorse.

Resale: The Immediate Income Strategy

The Case for Buying Existing Properties

Resale properties deliver something off-plan cannot: immediate returns. You complete the purchase, furnish the property, obtain your tourist licence or find a tenant, and start earning income within weeks. There's no construction wait, no uncertainty about the finished product, and you can physically inspect what you're buying — including the views, noise levels, community atmosphere, and property condition — before committing.

Real example (Mijas Costa, 2026): A two-bedroom resale apartment purchased for €260,000 in a well-maintained 2005-era complex with pool and gardens. After purchase costs (€29,000) and furnishing (€8,000), total investment: €297,000. The property is listed on Airbnb within one month and generates €21,000 in rental income in its first year. Gross yield on total investment: 7.1%. After operating costs: approximately 4.2% net yield.

Renovation Uplift Potential

Resale properties offer something off-plan doesn't: the opportunity to add value through renovation. A dated but well-located apartment purchased at a discount to modern equivalents can be transformed through a €40,000-€70,000 renovation, potentially adding €60,000-€100,000 in value while simultaneously commanding higher rental rates.

The renovation uplift strategy combines capital appreciation with income generation — you improve the property, increasing both its sale value and its earning potential. This dual benefit is unique to resale and represents a significant advantage for hands-on investors.

Resale Risks

Resale carries its own set of risks:

Hidden defects: Unlike new-build properties with 1-3-10 year guarantees, resale properties are sold as-seen. Structural issues, damp, outdated electrical wiring, plumbing problems, and community disputes may not be apparent during viewing. A comprehensive survey (€400-€800) and thorough legal due diligence are essential.

Community issues: Older communities may have deferred maintenance, upcoming special assessments (derramas), or disputes between owners. Request the last 3 years of community meeting minutes and financial statements before purchasing. A community with a healthy reserve fund and no outstanding legal disputes is worth paying a premium for.

Higher purchase tax: Resale properties in Andalusia attract ITP (transfer tax) at 7%, while off-plan purchases from developers attract IVA (VAT) at 10% plus AJD (stamp duty) at 1.2%. The total purchase tax is actually similar (7% vs 11.2%), but the resale calculation is based on the purchase price while the off-plan calculation may be based on a higher reference value, narrowing the gap.

Historical Returns Comparison: 2020-2026

Let's compare how both strategies have performed over the recent growth period:

Off-plan buyer (purchased Phase 1 in 2022, completed 2024):

• Phase 1 price: €240,000 (30% deposit: €72,000)
• Completion value: €310,000
• Current market value (2026): €360,000
• Capital gain: €120,000 (50%)
• Plus rental income 2024-2026 (2 years at €18,000 net): €36,000
• Total return: €156,000 on €240,000 + costs = approximately 55% total return over 4 years

Resale buyer (purchased in 2022):

• Purchase price: €220,000
• Total investment (inc. costs, furnishing): €260,000
• Current market value (2026): €310,000
• Capital gain: €90,000 (41%)
• Plus rental income 2022-2026 (4 years at €14,000 net): €56,000
• Total return: €146,000 on €260,000 investment = approximately 56% total return over 4 years

Remarkably similar. The off-plan buyer benefited from higher capital appreciation (buying at pre-construction discount), while the resale buyer benefited from four years of rental income versus the off-plan buyer's two years. The two strategies converge because the resale buyer's income advantage largely offsets the off-plan buyer's price discount advantage.

Bank Guarantee Protection: Ley 57/68

Spain's Ley 57/68 (updated by subsequent legislation) requires developers of residential property to guarantee buyer deposits through either a bank guarantee (aval bancario) or an insurance policy (poliza de seguro). This protection was strengthened after the 2008 crisis when thousands of buyers lost deposits to bankrupt developers.

What it covers: If the developer fails to deliver the completed property by the agreed deadline (plus a reasonable grace period), or the project is cancelled, the buyer can claim a full refund of all amounts paid, plus accrued interest. The bank or insurance company must pay regardless of the developer's financial situation.

What it does NOT cover: Changes of mind by the buyer, market value decreases, minor specification changes, or delays within a reasonable tolerance. If you simply decide you no longer want the property, the bank guarantee does not help — you forfeit your deposit.

How to verify: Before paying any deposit beyond the initial reservation, request a copy of the bank guarantee certificate or insurance policy. It should name you as a beneficiary, reference your specific unit, and cover the total amount of your stage payments. Your lawyer should verify this document's authenticity with the issuing bank or insurer.

Which Strategy for Which Investor Profile

Off-plan suits you if:

• You have capital that you don't need to deploy immediately (you can wait 18-30 months for returns)
• You're comfortable with construction risk and have done thorough developer due diligence
• You want a brand-new property with modern specifications and energy efficiency
• You're targeting capital appreciation as your primary return driver
• You want to spread your investment over 18-24 months rather than paying everything upfront

Resale suits you if:

• You want immediate rental income from day one
• You prefer to inspect exactly what you're buying before committing
• You have renovation skills or contacts that can add value
• You're more conservative and want to avoid construction risk
• You're targeting steady income rather than speculative capital gains
• You want personal use of the property immediately (holidays, retirement, relocation)

The hybrid approach: Many experienced Costa del Sol investors maintain a portfolio that includes both off-plan and resale properties. Off-plan units deliver capital growth spurts on completion, while resale properties provide steady rental income. The combination smooths cash flow and diversifies risk.

Neither strategy is inherently superior — both have delivered strong returns in the current market cycle. The key is matching the strategy to your financial situation, risk tolerance, and personal involvement level. Whatever you choose, the fundamentals remain the same: buy in strong locations, do thorough due diligence, and take professional legal and tax advice before committing.