How to Avoid Common Renovation Problems on the Costa Blanca
Most renovation problems on the Costa Blanca are decided before the first wall is opened. They come from a property whose paperwork does not match reality, quotes that cannot be compared, a contract that says little about payments and deadlines, and damp or salt problems that were never diagnosed. Check each of these in order and the build itself becomes far more predictable. This guide goes through them as we see them on projects in Torrevieja, Orihuela Costa and the wider Vega Baja.
Key Takeaways
Verify the property first: Land Registry, Cadastre and the real building should match, and the home needs, or must be able to obtain, an occupancy licence.
Match the permit to the work. Structural, façade or volume changes need an architect’s project and a building licence, not a minor-works permit.
Send every builder the same brief, demand itemised quotes, and check the builder’s REA registration, tax ID and insurance.
Put payment stages, deadlines, delay penalties and warranty terms in a written contract, and keep a contingency of 10% (15% or more for older homes).
Diagnose damp, salt and waterproofing before choosing finishes, and get photo evidence at every stage if you live abroad.
Table of Contents
Check the property before you plan the works
The costliest surprises are legal rather than structural. When buying or renovating near Alicante, the Land Registry, the Cadastre and the reality on the ground should match, and you should check for open planning infringement proceedings and whether the land classification allows what you want to build. The same source notes that the property needs its occupancy licence, or the ability to obtain one, because utility contracts and future sales depend on it.
In practice, older villas and apartments on the coast often carry extensions, enclosed terraces or porches that were never registered. Renovating around them does not make them legal. If you are still at the buying stage, our guide to four checks before buying a property to renovate covers the order in which to do this.
Pro Tip: ask your lawyer or architect for a short written note listing every discrepancy between the registry description and the actual layout. It becomes the starting point of your scope.
Match the permit to the work
Spanish municipalities distinguish between minor works and works that need a full project. Replacing a bathroom or repainting is a different category from moving load-bearing walls, altering a façade or adding volume. According to the same architectural guide, major works affecting structure, façade or volume require a project signed by an architect and a building licence. It also warns that starting structural works under a minor-works permit can lead to fines, stop orders and, in the worst cases, demolition orders.
Procedures differ by council. Torrevieja publishes its own minor-works licence procedure, with an electronic application and a list of documents to submit, so check your own town hall’s page before any work starts. If you own from abroad, our article on renovating a Spanish property from abroad and when walls need approval explains how this affects remote projects.
A quick permit test
Work | Usually treated as |
Repainting, new tiling, replacing taps and sanitaryware | Minor works, confirm locally |
Bathroom or kitchen refit without moving structure | Often minor works, depends on the council |
Removing or opening load-bearing walls | Project and building licence |
Façade changes, extensions, new pool | Project and building licence |
The table is a guide only. Your architect or the town hall’s urban planning department decides the category for your specific property.
Diagnose damp, salt and water before you choose finishes
The coastal climate punishes poor detailing. Salt air, heavy autumn downpours and flat roofs mean that leaking terraces, damp ceilings and water entering through façades are among the most common faults we are called to. Fresh paint over a damp wall is the classic mistake: it looks right for a few months and then blisters.
A sound sequence looks like this:
Find the source first. Rising damp, condensation, a leaking pipe and a failed terrace membrane all look similar on a ceiling but need different repairs.
Repair the cause. That may be impermeabilisation of a terrace or roof, a repaired water line, or improved cavity ventilation.
Let the structure dry before plastering and painting.
Specify materials for salt exposure, such as AISI 316 stainless steel for exterior fixings near the sea.
We go deeper in coastal home renovation in Spain and the moisture details to demand. If you already have a leak or damp patch, our team handles water leak detection and repair and roof and terrace waterproofing.
Pro Tip: photograph every damp area in dry weather and again after the first heavy rain. The difference often shows the real source.
Set a scope and budget that can survive reality
Cost overruns are mostly scope problems. The Federation of Master Builders advises breaking the budget into labour, materials, fixtures, professional fees, permit fees, waste removal and finishing, setting aside 10% contingency, or 15% or more for older homes or structural alterations, and locking down the scope early. Their guidance is from the UK, but the logic holds for any older Spanish property where hidden pipework and wiring surface once walls open.
A few habits that protect the budget:
Choose tiles, sanitaryware, kitchen units and flooring before the contract is signed, not during the works.
Set decision deadlines, because late design changes are what cause budgets to spiral.
Ask for the work in phases, so you can see where money goes and pause between stages.
Treat a fixed price agreed before work begins as your strongest protection, a point also made in US consumer guidance on mid-project budget changes.
For local cost ranges and what drives them, see how much a Costa Blanca renovation costs in 2026.
Compare quotes like for like
Two quotes with a 20% gap rarely describe the same job. One may omit waste removal, protection of common areas, electrical certification or a plasterer. A comparison only works when every builder receives the same brief. As one Spanish guide to choosing a renovation company puts it, send all builders the same description of works, rooms, material quality and site access, then require itemised quotes by trade, with units and unit prices, and check measurements and omitted items.
When you review the quotes, look for:
Materials and labour shown separately
Quantities that match your own measurements
Named brands or quality levels, not just “supply of tiles”
Waste removal, skip hire and cleaning
What is excluded, written down
Our Costa Blanca villa renovation guide on diagnosing first and comparing three quotes walks through a worked comparison.
Check the builder, not just the quote
In Spain, companies and self-employed workers with employees who are to be contracted or subcontracted on a construction site must be registered in the REA, the register of accredited companies, which accredits compliance with quality and solvency requirements. You can check a contractor yourself on the Ministry of Labour’s public REA consultation page by CIF, NIF, NIE or REA number.
Beyond the REA, ask for:
The builder’s tax ID and legal company name, matching the contract and the invoices
Photos and addresses of comparable finished projects, which you can then ask to see
A named person responsible for the site
A builder who is hesitant to provide any of this has told you what you need to know. For a shortlisting method specific to our area, read how to choose a renovation company in Torrevieja.
What the contract must say
A handshake and a WhatsApp quote are where most disputes start. The Spanish consumer organisation OCU advises that a renovation contract should identify the contractor and signatory, define the work and its cost, set start and completion dates, provide for delay penalties and payment stages, and state the warranty terms. It should also state who is responsible for obtaining the end-of-works certificates.
In plain terms, your contract should answer these questions:
Topic | What to write down |
Scope | Rooms, trades, materials and quality level, with the itemised budget attached |
Payments | Stages linked to completed work, never a large upfront sum |
Deadlines | Start date, completion date, and the penalty for delay |
Changes | Written, priced variations signed by both sides before they are carried out |
Waste | Who removes it and who pays |
Warranty | Duration and what it covers |
Certificates | Electrical, plumbing and any end-of-works documents, and who obtains them |
Pro Tip: link each payment to a visible milestone, for example “first fix electrics and plumbing complete”, and release it only after you or your representative has seen it.
Managing a renovation from abroad
Many of our clients own a second home or an investment apartment and live in the UK, Ireland, Germany, the Netherlands, the Nordic countries or elsewhere. The risk is not distance itself but the lack of evidence. A workable system includes:
A weekly photo and video update tied to the milestone list
One named contact who speaks your language
Written approval of any change before it is executed
Payments released against verified stages, not against promises
A final walk-through, in person or by video call, with a snagging list
Some owners also hire an independent supervisor, which is a sensible choice on larger structural projects. Our guide to preparing a Costa Blanca holiday home covers what to arrange before you leave the property in the hands of a contractor.
Common mistakes and how we prevent them
These are the repeat offenders on Costa Blanca jobs:
Starting before the permit is confirmed. Wait for the confirmation, or for written agreement from the architect that the work is minor.
Opening walls without a plan for services. Older apartments, such as many in central Torrevieja, often hide outdated wiring and pipework. Our piece on modernising an older apartment in Torrevieja shows what to budget for.
Buying finishes late. Delays in delivery become delays in the programme.
Underestimating the sequence. Plumbing and electrics first, then plastering, then tiling, then carpentry and painting. Reversing this causes rework.
Ignoring summer and holiday availability. Trades and suppliers are slower in August, so plan your start accordingly.
Not documenting. Keep quotes, variations, invoices and certificates together. You will need them when you sell or rent.
For a stage-by-stage view of a full project, see home renovation in Torrevieja: five stages, permits and coastal costs.
Our perspective: what we would do in your place
We manage renovations as a single process, not a collection of trades. Plumbing, electrical work, plastering, carpentry, painting and air conditioning are coordinated by one team, which removes the most common source of delay: trades waiting for each other or blaming each other. We provide free, detailed quotes broken into phases, and work is billed by contract according to the scope agreed.
The pattern we see is consistent. Projects go well when the owner decides the scope early, the permit category is confirmed, the quote is itemised, and every payment follows a verified stage. They go badly when speed is prioritised over diagnosis. If we had to give one rule for the Costa Blanca, it would be to treat water as the first design question: where it enters, where it drains, and what salt does to everything it touches. The weakest link fails first, and on this coast it is usually the terrace, the roof edge or the pipe nobody inspected.
— URU Reformas
Let one team manage the whole project
If you want a renovation planned, priced and coordinated by a single company, URU Reformas covers full and partial renovations, façade work, kitchens, bathrooms, extensions and waterproofing in Torrevieja and the Vega Baja, including emergency repairs around the clock. We offer free consultations and detailed phased quotes, and we can keep you informed with regular updates if you are abroad.
To discuss your property, contact us for a free quote, or look at examples of our work first.
If something goes wrong
Even with good preparation, disputes happen. For missed deadlines, the Spanish consumer authorities advise to complain first in writing, stating the agreed deadline, the delay and the solution you request. If there is no satisfactory answer within 15 days, you can go to public consumer services, a consumer association, consumer arbitration if the company accepts it, or the courts.
This is why the written contract matters: it gives your complaint a deadline and a scope to point to. For anything involving legal action or large sums, speak to a Spanish lawyer (abogado) before escalating.
FAQ
How much contingency should I add to a renovation budget?
Ten per cent is a common minimum, and 15% or more is advised for older homes or structural alterations. Older Costa Blanca properties often reveal outdated pipework or damp once walls open, so the higher figure is prudent there. A detailed scope signed before work starts keeps the contingency for genuine surprises only.
Do I need a licence for a bathroom or kitchen renovation?
Often a minor-works licence or declaration is enough, but the rules are set by each town hall. Check your council’s urban planning page, such as Torrevieja’s minor-works procedure, or ask your architect. If the work touches structure, façade or volume, a project and building licence are required.
How do I check that a builder is properly registered?
Ask for the REA number and tax ID, then search the Ministry of Labour’s REA consultation portal. Also ask to see a current public liability insurance policy. Compare the details with the name on the contract.
What should I do if the work is late?
Send a written complaint stating the agreed deadline, the delay and what you want done. If you get no satisfactory response in 15 days, you can contact consumer services, a consumer association, arbitration or the courts, as Spain’s consumer authorities explain.
Sources
Recommended
Comments