Entrance Doors in Aluminium and PVC: Security, Insulation and Style

The front door is the one part of a house that has to do everything at once: stop intruders, keep heat in and noise out, survive years of sun and salt air, and still make a good first impression. It is also the component homeowners most often under-spec, choosing on looks alone and discovering later that the door is draughty, easy to force, or already corroding on a coastal plot. In Spain, where summers are punishing and the coastline is long, getting the entrance door right matters more than people expect.

This guide covers the two things that actually keep you safe — door construction and the lock — then compares aluminium and PVC for exterior use, explains thermal and weather performance, and gives realistic 2026 prices. Estimia doesn’t manufacture or fit doors; we verify the specialists who do, so you can request and compare several quotes side by side rather than trusting a single showroom.

Security: what “blindada” and “acorazada” really mean

Spanish door terminology causes a lot of confusion, and salespeople blur the lines. The two key concepts:

• Puerta blindada (reinforced door): a standard door leaf with steel sheets added to the faces for reinforcement. It’s noticeably stronger than a plain interior-grade door and a sensible step up in security, but the frame and core are essentially still a normal door’s.
• Puerta acorazada (armoured door): built around a steel block/frame with the steel structure integral to the whole assembly — leaf and frame together. It resists forcing, prying and impact far better than a blindada and is the genuine high-security choice.

For a flat’s main door, an acorazada is the gold standard; for a villa’s front entrance you’ll often combine a robust door with an alarm and good lighting. Whatever the marketing name, what matters is the anti-bumping, anti-pick, anti-drill cylinder and the locking mechanism behind it.

The lock is the weak point

Most break-ins exploit the lock, not the door. Look for:

• Multipoint locking (cierre multipunto): the lock throws bolts at several points up and down the frame (typically 3–5 points), not just one. This spreads force and makes prying the door open far harder.
• A quality security cylinder: anti-bump, anti-pick, anti-snap and anti-drill, ideally with a certified anti-snap rating and a registered key card so copies are controlled.
• Reinforced strike plates and hinges with anti-lever pins so the door can’t be jemmied off its hinges.

A mid-range door with an excellent multipoint lock often beats an expensive door with a basic cylinder. When comparing quotes, make sure each one states the exact lock and cylinder, not just “high-security lock”.

Aluminium vs PVC for exterior entrance doors

Both materials are used for modern Spanish entrance doors. The right choice depends on climate, security needs and budget.

In short: aluminium is the premium, design-led and high-security choice — its rigidity suits large panels and armoured builds, and a good thermally-broken aluminium door performs well. PVC is the value-and-insulation choice and shrugs off salt air, but in the harshest Andalusian or Canary sun you want quality PVC with UV-stable colour, ideally in lighter tones that absorb less heat. For more on the metal-vs-plastic trade-off generally, see our comparison guide on aluminium vs PVC windows, since the same physics applies.

Thermal performance

The front door is part of the building envelope, and under the CTE (Spain’s building code) exterior openings have thermal requirements. Two things drive performance:

• Thermal break (rotura de puente térmico) on aluminium: without it, an aluminium door conducts heat straight through the frame and you get cold (or scorching) metal and condensation. Always specify a thermally-broken profile for an aluminium exterior door.
• Insulated core and glazing: a solid insulated panel core, plus double glazing for any glass sections, keeps the door’s overall Ud value down. A good modern entrance door reaches a Ud roughly in the 1.3–2.0 W/m²K range; cheaper non-thermal builds are much worse.

In a hot climate the door also needs good gaskets and a tight seal so conditioned air doesn’t leak out — a poorly sealed door is a year-round energy drain.

Finishes, panels and style

Modern entrance doors are highly configurable, and this is where aluminium pulls ahead:

• Panel styles: flush minimalist, grooved/lined, with vertical glazing strips, or with frosted/laminated glass sections for light.
• Finishes: the full RAL colour range, anodised metallics, and convincing wood-effect (madera) sublimation finishes that give a timber look without timber’s maintenance.
• Handles and hardware: long pull bars for a contemporary look, plus options like keyless entry, fingerprint or smart locks integrated with the multipoint mechanism.
• Fixed side panels and fanlights to widen narrow entrances and add light.

Choose finishes with your climate in mind: dark colours in full Andalusian sun get very hot and can stress the material over years, so confirm the finish is rated for high heat and UV.

Weather resistance on the coast

The Spanish coast — Costa del Sol, Costa Blanca, the islands, the Atlantic north — is brutal on exterior hardware. Salt-laden air corrodes anything not specified for it.

• Coatings: insist on a marine-grade / Qualicoat Seaside-class powder coating on aluminium. Standard coatings chalk and pit in salt air.
• Hardware: hinges, handles and lock components should be stainless steel or marine-rated; ordinary steel parts rust and stain quickly near the sea.
• Seals and drainage: gaskets must stay flexible in UV, and the threshold should drain driven rain away rather than into the home.
• PVC near the sea: PVC’s big advantage is it simply doesn’t corrode, which is why it’s popular on coastal flats — just specify UV-stable colour.

Prices in Spain (2026)

Entrance doors are usually priced per unit (supplied and installed), since size and spec vary so much. As a realistic 2026 guide:

Extras that move the price: certified anti-snap cylinders, smart/biometric locks, marine-grade coatings, side panels and glazing, removal and disposal of the old door, and tricky access. Some energy-efficiency incentives can apply to thermal upgrades, but several NextGenerationEU-linked schemes are winding down through 2026 — check current local programmes rather than assuming a deduction.

What to check before you buy

1. Construction: blindada vs acorazada — and is the steel structure integral or just face sheets?
2. Lock: number of locking points and the exact cylinder (anti-bump, anti-pick, anti-snap, anti-drill rating).
3. Thermal break on aluminium and the door’s Ud value.
4. Coastal spec if relevant: marine coating and stainless hardware.
5. Finish suitability for sun and heat in your region.
6. Warranty split between the door, the finish and the lock mechanism.
7. Who installs — in-house fitters or subcontracted — and the lead time.

Conclusion

A good entrance door is a balance: enough security for your situation, a thermal break and insulated core so it doesn’t leak energy, the right coating and hardware for your climate, and a finish you’re happy to come home to. Aluminium leads on security and design, PVC on value and insulation — but the lock and the build quality decide whether the door actually protects you.

Compare verified entrance-door specialists on Estimia and request several quotes to weigh side by side. Every company on the platform is vetted before it can receive enquiries, so you can compare construction, locks and prices with confidence instead of trusting a single salesperson.