Renovating an Older Costa Blanca Villa: Costs & Permits

The majority of resale villas in Jávea, Moraira, Benissa and Dénia were built between the 1970s and early 1990s. They sit on generous plots, offer more space per euro than new-builds, and have the proportions that modern villas rarely match. The trade-off is that most need meaningful updating — and the scope of that work surprises many buyers who have not owned Spanish property before.

This guide covers what typically needs doing, the permits involved, realistic timelines, and current budget ranges for the Costa Blanca North market.

What Typically Needs Doing

Electrics. If the villa has not been rewired since the 1990s, assume it needs doing. Spanish wiring regulations changed substantially after 2002, and older fuse-based boards do not comply with current standards. A full rewire on a 130 m² villa typically costs €4,000–€8,000, including a new cuadro eléctrico. It also triggers the new boletín eléctrico that your electricity supplier will require before reconnecting a full contract.

Plumbing. Galvanised iron was the standard pipe material until the 1990s and corrodes internally, reducing flow and affecting water taste. Replacing with copper or PEX typically costs €3,000–€6,000. If the villa is on a private well rather than mains supply, add water-treatment equipment.

Windows and glazing. Single-pane aluminium frames were universal before 2000. Double-glazed PVC or aluminium units reduce heat loss by 30–40% and meaningfully cut summer noise. Budget €300–€600 per opening, fitted; most villas have 12–18 openings.

Roof and waterproofing. Flat or low-pitch roofs are common across the stock from this era and frequently show their age as damp patches on interior ceilings. A full re-waterproofing typically costs €4,000–€9,000 depending on surface area. Check terrace drains and expansion joints at the same time.

Kitchen and bathrooms. Budget €5,000–€15,000 for a fitted kitchen and €3,000–€8,000 per bathroom, not including tile removal, plumbing reconfiguration or ventilation upgrades. Bathrooms from this era also commonly lack adequate extraction.

Pool (where applicable). A re-tile and pump or filter replacement runs €5,000–€10,000. A full structural rebuild costs €15,000–€25,000. Adding solar heating during a pool refurbishment is economical.

Energy upgrades. Pre-2006 builds have minimal insulation. Roof-void insulation combined with new glazing can cut energy bills by 40–60%. A 3–4 kW solar installation with battery storage costs €4,000–€7,000 and is increasingly standard on renovated villas.

Permits: Three Tiers, Three Timelines

Spanish building control is administered by each municipality, so the precise rules vary between Jávea, Moraira, Dénia and their neighbours — but the underlying framework is consistent across the Valencian Community.

Declaración responsable / obra menor. Cosmetic refurbishment, like-for-like window replacements, A/C installation, internal partition changes and electrical upgrades generally fall into this category. In most Costa Blanca North towns you file a responsible declaration, pay the ICIO municipal construction tax (typically 2–4% of declared works value), and can begin within one to four weeks.

Licencia de obra mayor. Structural interventions — touching load-bearing walls, modifying the roof profile, building a pool, adding a terrace or any extension of the built footprint — require a full architect-drawn project, a visado from the relevant professional college, and the town hall's express written approval. In Jávea, the Ayuntamiento de Xàbia has a statutory three-month window to resolve the application; administrative silence is treated as a refusal. Budget an architect's project fee of 5–10% of construction value plus an aparejador (technical architect) site supervision fee of roughly 3–5%.

If you are unsure which tier applies to your scope, ask a local aparejador before starting. Beginning structural work under the wrong permit category is a planning infraction that can result in a stop-notice and fines.

See also: Jávea Minor Works Permit: Licencia de Obra Menor and Pools and Extensions: Building Permits in Costa Blanca.

Realistic Timelines

One practical point: July and August are the slowest months for building trades on the Costa Blanca. Many local builders and their subcontractors take four to six weeks of holiday. If you want work to begin in spring or summer, engage your architect and submit permits by March at the latest.

Budget Ranges

Add a 20–25% contingency to any quote. Older villas regularly reveal surprises behind plaster: damp in party walls, undersized drainage, or buried utilities that were never mapped. Get three itemised written quotes before committing, and stagger payments — typically 20–30% upfront, 30–40% at midpoint, balance on completion. Never pay the full sum in advance.

Working With Local Trades

The Costa Blanca North has a well-established community of foreign-friendly renovation firms and independent tradespeople, many of whom communicate in English, Dutch or German. Personal recommendation — from your buyer's agent, property manager or neighbours who have recently renovated — is the most reliable filter.

Verify that any contractor is properly registered in the Spanish Social Security system. Ask for their CIF/NIF and confirmation of autónomo or company registration. Cash-only arrangements create problems with permit certification and provide no legal recourse.

For projects requiring an obra mayor licence, an independent aparejador acting as project manager is worth the fee. They certify compliance with the approved plans, produce the certificado final de obra, and generate the documentation you will need for resale or a Spanish mortgage.

Frequently Asked Questions

Does a full renovation require an architect in Costa Blanca? Only if the works qualify as obra mayor — structural interventions, extensions, roof changes or new pools. Cosmetic and maintenance work can proceed under a declaración responsable without an architectural project, though you will still need permit paperwork and payment of ICIO.

Can I start renovating before I legally complete the purchase? No. Permits are issued to the registered property owner. You can commission designs and get quotes during due diligence, but work cannot legally begin before title transfers at the notario.

What is ICIO and how much is it? ICIO (Impuesto sobre Construcciones, Instalaciones y Obras) is the municipal construction tax, typically 2–4% of declared works value, paid when you submit your permit application. The exact rate is set by each municipality.

How long does an obra mayor permit take in Jávea? The Ayuntamiento de Xàbia has a statutory three-month window to resolve the application. Straightforward projects are often resolved sooner. The clock does not start until your file is administratively complete.

What VAT rate applies to renovation work? Standard IVA on construction services is 21%. A reduced rate of 10% can apply to renovation and repair of housing that has been occupied for at least two years, subject to conditions on the proportion of materials cost. Your architect's design fee is charged at 21% regardless.

Should I budget for asbestos removal? Some materials used in 1970s Costa Blanca construction — including certain roof-valley sealants, pipe insulation and floor tile adhesives — can contain asbestos. A pre-demolition survey by a certified technician is advisable before any substantial demolition work. Your aparejador can advise on whether a formal survey is warranted given the property's age and condition.