GFD Homes breaks down everything you need to know about choosing an aluminium door — from security ratings to thermal breaks, glazing, and long-term performance.
What You’ll Learn:
- What an aluminium door really is and how GFD Homes builds them for long-term performance
- The aluminium door terminology you’ll see everywhere — explained simply by GFD Homes
- How aluminium door security works, from PAS 24 ratings to locking systems
- Why GFD Homes recommends aluminium doors for modern homes, extensions, and secure entrances
(Estimated Reading Time: 5-6 Minutes)
Introduction: Aluminium Doors, Made Simple by GFD Homes
A great aluminium door should offer style and strength without confusing you along the way — but once you start researching, the jargon quickly takes over. Suddenly you’re faced with terms like thermal breaks, U-values, PAS ratings, and powder coating when all you really want is a door that’s warm, secure, and built to last.
That’s where GFD Homes steps in.
We’ve created this guide to strip back the complexity and give you practical, no-nonsense advice on choosing aluminium doors with confidence. Whether you’re upgrading your front entrance, designing an extension, or exploring modern glazed door options, GFD Homes will help you understand what matters — and what doesn’t.
1. What Exactly Is an Aluminium Door?
An aluminium door is a high-performance alternative to timber or uPVC — built from durable, powder-coated aluminium profiles with a thermally insulated core.
These doors come in many forms:
- Front entrance doors (e.g. Smart Signature range)
- French doors
- Sliding patio doors
- Internal aluminium partitions (like Smart Aluspace)
Aluminium doors are chosen for their longevity, precision, and clean design — ideal for modern homes and extensions.
2. The Key Terms Explained
a. Aluminium Profile
The profile is the structural frame that makes up the door. Think of it as the skeleton.
Why it matters:
A stronger profile allows slimmer frames and larger glass areas — without flexing or bowing.
High-quality systems like Smart and Cortizo use precision-engineered, thermally broken aluminium.
b. Polyamide Thermal Break
A polyamide thermal break is an insulating barrier between the inner and outer aluminium sections.
Why it matters:
It prevents heat loss through the metal frame, giving U-values as low as 1.4 W/m²K.
Without it, the door would act like a radiator in reverse — letting warmth escape.
c. Panel Infill vs Fully Glazed
Panel infill doors feature solid insulated panels (often decorative).
Fully glazed doors are mostly glass with slim aluminium framing.
Why it matters:
- Panel infill = more privacy, higher insulation.
- Fully glazed = more light, contemporary style.
Choose based on where the door is located — front, side, or rear.
d. PAS 24 Rating
A UK security standard proving the door has been tested against forced entry.
Why it matters:
Look for PAS 24 or Secured by Design certification — especially for entrance or patio doors.
All Smart and Cortizo systems available via GFD Homes meet or exceed PAS 24.
e. U-Value
A U-value measures how well your door insulates.
Lower numbers mean better efficiency.
Typical range: 1.3–1.6 W/m²K.
Why it matters:
Keeps your home warm and helps meet modern building standards.
f. Powder Coating
This is the colour finish applied to the aluminium.
It’s baked on at high temperatures, creating a smooth, durable surface.
Why it matters:
- Scratch- and fade-resistant.
- Available in hundreds of RAL colours.
- Marine-grade coatings resist coastal weather.
Tip: Ask for a Qualicoat-certified finish — it guarantees long-term performance.
g. Marine Grade Finish
A higher specification of powder coating designed to resist salt, moisture, and corrosion — ideal for coastal or exposed locations.
Why it matters:
Ensures colour longevity and corrosion resistance.
h. Cill / Threshold
The cill is the drip ledge that diverts water away from the base of the door.
The threshold is what you step over when entering.
Options:
- Low threshold for level access.
- Rebated threshold for better weatherproofing.
Why it matters:
Choose based on exposure — low for internal or sheltered use, rebated for external.
i. Locking Systems
Modern aluminium doors feature multipoint locking — several bolts engage along the frame when the handle lifts.
Why it matters:
This spreads pressure evenly and dramatically improves security.
Paired with a 3-star cylinder, it’s virtually pick- and drill-proof.
j. Glazing Options
Your glass choice affects warmth, light, and noise.
| Glass Type | Benefit |
| Toughened | Stronger and safer |
| Laminated | Adds security and sound insulation |
| Triple Glazing | Maximises efficiency |
| Solar Control | Reduces glare and overheating |
| Obscure/Frosted | Privacy for bathrooms or side doors |
k. Colour Matching
Aluminium doors can be colour-matched to your windows, bifolds, or sliding doors for a seamless finish.
Smart Systems, for example, use the same RAL palette across their entire product range.
3. Aluminium Door Types from GFD Homes
Smart Signature Aluminium Composite Doors
- From £1,526 inc VAT
- Premium aluminium exterior with insulated composite core.
- Incredible thermal and acoustic performance.
- Over 100 colour combinations.
- Contemporary and traditional styles.
Smart Alitherm 400 Glazed & French Doors
- Modern, minimalist frames with excellent insulation.
- Perfect for rear entrances and extensions.
Cortizo Aluminium Doors
- Ultra-slim frames and luxury European design.
- Ideal for architectural and contemporary homes.
4. Common Confusions Cleared Up
| Term | Common Misunderstanding | The Real Meaning |
| Thermal Break | “Marketing gimmick” | Critical insulation layer |
| Powder Coating | “Just paint” | Industrial-grade baked finish |
| U-Value | “Complicated number” | The energy-efficiency score |
| PAS 24 | “Optional extra” | Mandatory for secure modern homes |
| Marine Grade | “Only for coastal homes” | Worth having anywhere for longevity |
5. Things to Consider Before Buying
Location:
Front door? Go solid or partially glazed. Rear door? Fully glazed for light.
Security:
Always check for PAS 24 compliance and 3-star cylinders.
Colour & Finish:
Choose RAL finishes that complement your home’s style — matte anthracite grey remains a UK favourite.
Threshold Type:
Rebated for weatherproofing, low for accessibility.
Warranty Ownership:
Always order in your own name to ensure your guarantee and aftercare protection.
6. Why Aluminium Beats the Alternatives
Compared to timber or uPVC, aluminium doors:
- Never warp, twist, or fade.
- Offer slimmer sightlines for a more refined look.
- Can hold larger glass panels for better light and views.
- Require almost zero maintenance.
They’re an investment in long-term style and performance — not a short-term fix.
7. Buying Direct Keeps You Protected
When you order from GFD Homes, your warranty, aftercare, and consumer rights belong to you — not your builder.
That means:
- You can speak directly to our experts for support.
- You get genuine manufacturer coverage.
- You can rest easy knowing your purchase is fully protected.
8. Instant, Transparent Pricing
Design, customise, and price your aluminium door online — down to the millimetre.
No hidden costs. No sales pressure.
9. In Summary
You now know:
- What thermal breaks, powder coating, and PAS ratings mean.
- How to choose the right threshold and glass type.
- Why aluminium is the premium choice for modern homes.
- And how buying direct keeps your guarantee safe.
At GFD Homes, we’re not just selling doors — we’re giving homeowners the tools to make smart, confident, future-proof decisions.
🛒 Browse the full collection at www.gfdhomes.co.uk
📞 Or call 01642 309576 for expert guidance and a no-pressure quote.
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FAQ’s
1. Are aluminium doors secure enough for front entrances?
Yes — a high-quality aluminium door offers outstanding security. Every aluminium door from GFD Homes meets PAS 24 standards and can be fitted with a 3-star cylinder and multipoint locking for maximum protection.
2. Are aluminium doors warmer than uPVC or timber doors?
Modern aluminium doors from GFD Homes use advanced polyamide thermal breaks to prevent heat loss. With U-values as low as 1.4 W/m²K, they offer excellent insulation while keeping a slim, contemporary look.
3. Do aluminium doors fade or corrode over time?
Not when they’re built properly. GFD Homes supplies aluminium doors with powder-coated, marine-grade finishes that resist fading, scratching, and corrosion — ideal even for coastal or exposed homes.
4. What’s the difference between a fully glazed aluminium door and a panel-infill door?
Fully glazed aluminium doors maximise light and views, making them popular for rear entrances and extensions. Panel-infill designs offer more privacy and higher insulation — perfect for secure front doors. GFD Homes offers both options.
5. Are aluminium doors worth the investment?
Absolutely. An aluminium door lasts decades, doesn’t warp or twist, offers top-tier security, and delivers a premium, modern look. When bought through GFD Homes, you also get full warranty protection in your name and transparent online pricing.
