Pest Control FAQ

Install drain covers on every bathroom and kitchen drain, and keep water traps full by running taps at least weekly. Dried-out water traps in drains are the number one entry point for cockroaches in Spanish homes — especially in holiday properties or guest bathrooms used infrequently.

Use fine-mesh stainless steel drain covers on all floor drains, shower drains, and kitchen sinks. Run every tap for 30 seconds at least once a week to keep water traps full. For holiday homes, cover drains with cling film secured by tape before you leave. See our full drain protection guide for product recommendations.

Apply gel bait every three months during cockroach season (May–October in most of Spain). Check bait points monthly and reapply if the gel has dried out — this happens faster in very hot, dry conditions. Focus on behind the fridge, under sinks, around drain pipes, and inside utility cupboards.

No. There is no scientific evidence that ultrasonic devices repel cockroaches. Studies consistently show they have no meaningful effect on cockroach behaviour. Gel bait, drain covers, and sealing entry points are the proven methods that actually work.

Bleach does not kill cockroaches on contact and is not a reliable treatment. However, pouring a capful of bleach down each drain weekly can help deter cockroaches from using drains as entry routes and keeps pipes cleaner. It should be part of your routine, not your primary defence.

Start in late April or early May: install drain covers, apply gel bait at key points, seal gaps around pipes and air conditioning units with silicone, and deep clean behind appliances. Place sticky monitoring traps near drains to detect early activity. Stock up on products before summer demand increases delivery times.

Yes. Before leaving: run every tap, cover drains, close toilet lids, apply fresh gel bait, remove all food, and close windows. When arriving: ventilate, check under sinks, run all taps, and place monitoring traps for 48 hours. For rental properties, add these steps to your cleaning turnover checklist.

Focus on gaps around pipe entries through walls, air conditioning unit housings, window frames (especially louvre windows), exterior door sweeps, and cable conduit holes. Use silicone sealant for small gaps and expanding foam for larger ones. Check both interior and exterior walls.

A standard cockroach treatment for an apartment typically costs €80–€150. Villas and larger properties range from €150–€300 depending on size and severity. Most reputable companies offer a free initial inspection. Annual maintenance contracts (2–4 visits) usually cost €200–€400 per year.

Call a professional if you see 5 or more cockroaches per week, find them during daytime (a sign of severe overcrowding), discover egg cases (oothecae), see cockroaches in multiple rooms, or if your DIY treatment hasn't reduced activity after two weeks. Apartment block infestations nearly always need professional building-wide treatment.

Look for companies registered with ANECPLA (Spain's National Environmental Health Association). In expat areas like the Costa del Sol, Costa Blanca, and Balearic Islands, many companies have English-speaking staff. Ask for proof of liability insurance and professional certification. See our directory for vetted companies by area.

A good pest controller will inspect your property, identify entry points and species, explain their treatment plan, and apply targeted treatments (usually gel bait in cracks and crevices, plus residual spray in key areas). They should advise on prevention steps and schedule a follow-up if needed. The visit typically takes 30–60 minutes.

Under Spanish tenancy law (Ley de Arrendamientos Urbanos), landlords are generally responsible for structural pest control and maintaining habitable conditions. If cockroaches enter through building infrastructure (drains, shared walls), the landlord or comunidad typically pays. Document the problem with photos and notify your landlord in writing.

Yes, and this is often the most effective approach for apartment blocks. Propose it at the next community meeting (junta de propietarios) or submit a written request to the administrator. Building-wide treatments typically cost €15–€30 per apartment and treat common areas, drains, and individual units simultaneously.

Spain has four main cockroach species: the German cockroach (small, light brown, found indoors in kitchens), the American cockroach (large, reddish-brown, enters from sewers), the Oriental cockroach (dark, slow-moving, found in damp basements), and the brown-banded cockroach (smaller, found in dry areas like bedrooms). The German and American cockroach are the most common household pests.

American cockroaches (the large reddish-brown ones) can fly short distances, especially on warm evenings. They may glide from walls or ceilings. German cockroaches have wings but rarely fly. If you see a large flying cockroach at night, it is most likely an American cockroach that entered through an open window or drain.

The large cockroaches in drains are typically American or Oriental cockroaches. While not venomous, they carry bacteria (Salmonella, E. coli) from the sewer system and can contaminate kitchen surfaces. Their droppings and shed skin also trigger asthma and allergies. They are a sanitation concern rather than a direct physical danger.

If it is light brown with two dark stripes behind the head and about 1–1.5cm long, it is likely an adult German cockroach — the most common indoor species in Spain. If it looks like a miniature version of a larger cockroach without stripes, it may be a nymph (baby). German cockroaches reproduce fast and require immediate treatment.

Cockroaches thrive in warm, humid conditions. Spanish summers provide ideal breeding temperatures (above 25°C), and reduced rainfall causes cockroaches to seek water indoors. Municipal sewer activity increases, pushing cockroaches up through drain pipes. Water traps also evaporate faster in unused bathrooms.

Maxforce Gel is the most effective consumer cockroach product available in Spain. It uses a cascade effect — cockroaches eat the bait, return to the nest, and spread the poison through the colony. One syringe (€12–€18 on Amazon.es) treats an entire apartment for 3+ months. It is what most professional pest controllers in Spain use.

Gel bait is far more effective for long-term control. Sprays kill individual cockroaches on contact but do not reach the colony. Gel bait is eaten and carried back to the nest, killing the entire colony through a cascade effect. Use spray only for immediate knockdown if you see a cockroach, and rely on gel bait for ongoing protection.

Gel bait like Maxforce is designed to be applied in cracks, crevices, and hidden spots (behind fridges, under sinks, inside cabinets) where children and pets cannot reach. When applied correctly in small pea-sized dots in concealed locations, the risk to children and pets is minimal. Always read the product label and follow application instructions.

Amazon.es stocks most consumer-grade products including Maxforce Gel, sticky traps, and drain covers. Some ferreterias (hardware stores) and Leroy Merlin carry pest control supplies. Professional-grade products (like Maxforce Platin) require a pest control licence in Spain and are not available to consumers.

Sticky traps use a glue surface and sometimes a pheromone lure to catch cockroaches that walk across them. They are best used as monitoring tools — place them near drains and under sinks to detect early activity and measure the severity of a problem. They are not effective as a sole treatment for an active infestation.

Spain's warm climate (above 25°C for much of the year), old municipal drain systems, and Mediterranean building styles create ideal conditions for cockroaches. Warm, damp sewers provide year-round habitat, and dry summers drive them indoors seeking water. This is not a hygiene issue — it is a climate and infrastructure issue that affects all property types.

Yes. New builds have modern plumbing but still connect to the same municipal sewer system. Cockroaches enter through drain pipes regardless of building age. New builds may have better-sealed entry points, but the drain route remains the primary risk. Prevention steps (drain covers, gel bait, sealed gaps) apply equally to new and old properties.

No. Cockroaches in Spain primarily enter homes through drains and external gaps — not because of poor hygiene. Even the cleanest properties on the coast get cockroaches if drains are unprotected and water traps dry out. Keeping a clean home helps (no food debris, sealed bins), but prevention through physical barriers is far more important.

Coastal areas tend to have higher cockroach pressure due to warmer average temperatures, higher humidity, and older drain infrastructure in tourist towns. However, inland cities like Madrid, Seville, and Zaragoza also experience significant cockroach activity, especially during hot summers. Climate tier matters more than proximity to the sea.

You can maintain a cockroach-free home through ongoing prevention, but Spain's climate means the external population will always exist. Think of it like maintenance rather than a one-time fix: keep drain covers in place, reapply gel bait every 3 months during season, seal new gaps, and run taps weekly. Most expats reach zero sightings within a month of starting a proper prevention routine.

The tiger mosquito (Aedes albopictus) is an invasive species now widespread across coastal Spain. It is smaller than the common mosquito, has distinctive black-and-white stripes, and is active during the day — unlike the common mosquito which bites at dusk and dawn. It can transmit diseases like dengue and chikungunya, though transmission risk in Spain currently remains low. Its daytime biting makes it much harder to avoid.

Tiger mosquitoes are active from approximately April through November, with peak activity from June to September. They cannot survive frost. Due to climate change, the season is extending each year — some coastal areas now see activity in March and December. In heated urban environments, limited activity can occur year-round.

Tiger mosquitoes breed in any standing water — even a bottleneck. Check weekly for: plant pot saucers, pebble trays, unused garden pots, tarps, gutters, old tyres, children's toys, and pet water bowls. Empty or cover everything. For water features and ponds that cannot be emptied, use BTi (Bacillus thuringiensis israelensis) — an effective biological larvicide safe for animals and fish.

DEET at 20–30% concentration is the most effective active ingredient against both tiger mosquitoes and common mosquitoes, lasting 4–6 hours. Icaridin (Picaridin) at 20% is equally effective and less irritating for sensitive skin. Essential oil-based repellents (citronella, lemon eucalyptus) are much weaker and need reapplication every 30–60 minutes. For sleeping, a plug-in repellent device (insecticida eléctrico) is very effective indoors.

Mosquito nets (mosquiteras) are strongly recommended for windows and doors in coastal Spain, especially during summer. Fly screens are standard in the Canary Islands and well-adapted expat homes. Without screens, air conditioning (which requires closed windows) provides an effective barrier. For beds in tiger mosquito areas, a bed net adds protection if you prefer open windows at night.

Yes — this is one of the most serious wildlife risks for dogs in Spain. The pine processionary caterpillar (Thaumetopoea pityocampa) has microscopic barbed hairs that release thaumatin, a powerful irritant. If a dog sniffs, licks, or steps on a caterpillar, it can cause severe tongue swelling, necrosis, and in extreme cases death from suffocation. Keep dogs on leads near pine trees from December through April and seek emergency veterinary treatment immediately if contact occurs.

Processionary caterpillars descend from their pine tree nests and form their characteristic long nose-to-tail procession lines between January and April, depending on altitude and region. Coastal areas (Costa del Sol, Costa Blanca) see them earlier — often January–February. Inland and higher altitude areas see them in March–April. Nest building begins in autumn (October–November) and is visible as white silk bags in pine crowns.

This is a veterinary emergency. Do not touch the caterpillar or your dog's mouth with bare hands. Rinse your dog's mouth, nose, and paws with large amounts of water. If the tongue begins to swell, go to an emergency vet immediately — swelling can obstruct the airway within hours. Do not let your dog lick itself. Even mild contact can cause tissue necrosis that may result in partial tongue amputation.

Look for white silk bags 10–30cm across in the upper branches of pine trees, typically on the sunny southern side. Nests appear from October onwards. If you spot nests, call a professional arborist or pest control company — removal requires specialist PPE. Do not attempt to remove nests yourself. The hairs can become airborne and cause skin and respiratory reactions.

Yes. Contact causes intense skin irritation, rash, and eye inflammation. Inhaling the airborne hairs can trigger asthma attacks and respiratory distress. Keep children away from pine trees between January and April, especially after rain which can make hairs airborne. If contact occurs, rinse with water, avoid rubbing, and seek medical attention if symptoms include breathing difficulty.

Very common in southern and eastern Spain. The subterranean termite (Reticulitermes species) is present throughout Andalucía, the Levante, and the Canary Islands. Barcelona and Valencia provinces have significant infestations. Termites cause billions of euros of property damage annually in Spain. They are a realistic concern for anyone buying or owning older property — especially with wooden beams, floor joists, or doors and window frames.

Yes — strongly recommended. Unlike the UK or US, Spain does not require a pest inspection as part of the conveyancing process. A professional termite inspection typically costs €100–€200 and can reveal damage that would cost tens of thousands to repair. Look for a company registered on the ROESB (Registro Oficial de Establecimientos y Servicios Biocidas). Ask specifically for a subterranean termite inspection covering the roof structure, floor joists, and all wooden elements.

Hollow-sounding wood when tapped, mud tubes (galeries of soil) running along walls or foundation blocks, discarded wings near windows in spring (swarmers), and unexplained cracks in wood skirting boards or door frames. Termite damage often looks fine externally but the wood is completely hollow inside. Some infestations are only discovered during renovations when structural timbers crumble.

Professional termite treatment for a typical Spanish villa starts at €500–€1,000 for a standard soil treatment (termiticide barrier). Larger properties, more severe infestations, or structural treatment can reach €2,000–€5,000. Most ROESB-registered companies provide a multi-year guarantee. DIY termite treatment is not practical or effective for subterranean termites — professional treatment is essential.

ROESB (Registro Oficial de Establecimientos y Servicios Biocidas) is Spain's official register of companies licensed to apply professional biocidal products, including termiticides, rat poison, and many professional insecticides. In Spain, these substances legally require application by ROESB-registered operators. Always verify your pest control company is on the register — companies without registration may use ineffective or illegal products, and their treatments carry no legal warranty.

Most homes in coastal Spain are affected by Argentine ants (Linepithema humile) — an invasive species that forms supercolonies with multiple queens. Contact sprays and most bait traps kill only foraging workers, triggering the colony to split (bud) and spread further. The only effective approach is slow-acting gel or liquid bait that foragers carry back to the colony. Boric acid liquid bait mixed with honey or sugar syrup is highly effective and cheap. Applying perimeter spray typically makes the problem worse.

Spain has one native scorpion species, Buthus occitanus (the yellow scorpion), found mainly in dry, rocky areas of Andalucía, Catalonia, and Aragon. Its sting is painful but not typically fatal for healthy adults — comparable to a wasp sting. Children, elderly people, and anyone with heart conditions should seek medical attention. Scorpions enter homes through ground-level gaps and hide in shoes, clothing, and bed sheets. Check before putting on shoes stored outside. A UV torch reveals scorpions in the dark.

In Spain, flea infestations in pet-free properties are common because fleas can remain dormant as pupae for up to 12 months. Holiday homes are a classic case: the previous owner had a pet, fleas pupated in carpets before the property was sold or rented, and the new occupant's footfall and vibration triggers mass hatching — sometimes hundreds of fleas emerging within days of arrival. Treating the property with a residual insecticide spray before occupying is the solution.

Yes. Bed bugs (Cimex lectularius) are a growing problem in Spanish hotels, holiday apartments, and hostels — especially in high-turnover tourist areas. They have nothing to do with cleanliness: five-star hotels get them too. Check the mattress seams and headboard within 10 minutes of arriving. Look for small brown insects (apple seed sized), rust-coloured stains, or tiny white eggs. If you find evidence, request a different room or property.

The Asian hornet (Vespa velutina) is an invasive species established in northern Spain (Basque Country, Navarre, Galicia) and spreading southward. It is smaller than the European hornet, with an orange face and yellow-tipped legs. It poses an extreme risk to honeybee populations and can be aggressive when its nest is disturbed. If you see a nest (typically grey, papery, and football-sized in trees or under eaves), call your local town hall — do not approach it. Reported sightings help track its spread.