1. What is an Aluminium Orangery?

An aluminium orangery is a home extension characterized by a solid flat roof perimeter, a central glazed lantern, and large windows or glazed panels set within robust perimeter walls—all constructed using aluminium frames. Unlike conservatories which are predominantly glass (typically 75%+ glazed roofs), orangeries maintain architectural presence through solid roof sections while the glass lantern floods the interior with natural light.

When crafted in aluminium, these structures benefit from the material’s exceptional properties: high strength-to-weight ratio allows for slim sightlines (frames up to 50% slimmer than uPVC), while thermal break technology ensures energy efficiency. Aluminium orangeries can be attached to existing properties or designed as standalone garden rooms.

Key Components of an Aluminium Orangery

• Perimeter roof: Solid insulated panels around the edges, typically finished with plasterboard internally and roofing materials externally
• Central lantern: Glazed roof structure that rises above the flat roof, allowing light from above
• Aluminium frames: Slim, strong profiles supporting glazing and roof structures
• Base walls: Often dwarf walls (600-900mm high) or full-height aluminium columns
• Glazing: Double or triple glazed units with Low-E coatings and argon gas filling

The aluminium used in modern orangeries is typically powder-coated for durability and available in virtually any colour, from classic anthracite grey (RAL 7016) to heritage shades like cream or green, making them suitable for both contemporary and traditional properties.

2. Why Choose Aluminium for Your Orangery?

Aluminium has become the material of choice for premium orangeries, offering advantages that timber and uPVC cannot match. Here’s why homeowners across Kent, Surrey, Sussex, Hampshire, and London are specifying aluminium.

2.1 Strength with Slim Profiles

Aluminium’s high strength-to-weight ratio means frames can be significantly slimmer than uPVC (up to 50% thinner) while maintaining structural integrity. This maximizes glass area, increasing natural light and views. For example, an aluminium orangery in Surrey might feature floor-to-ceiling glazing with barely visible frames, creating a seamless connection with the garden.

2.2 Thermal Efficiency (Thermal Break Technology)

Modern aluminium orangeries incorporate thermal breaks – insulating barriers made from polyamide or similar materials placed between interior and exterior aluminium surfaces. This prevents heat transfer, achieving U-values as low as 1.2 W/m²K. Combined with double or triple glazing (Low-E coatings, argon gas), aluminium orangeries are comfortable year-round, meeting and exceeding Building Regulations Part L.

2.3 Durability and Longevity

Aluminium is naturally resistant to corrosion, rust, and UV degradation. Powder-coated finishes (applied electrostatically) provide additional protection, typically guaranteed for 20-30 years. Unlike timber, aluminium doesn’t rot, warp, or require repainting. An aluminium orangery installed today will likely last 50+ years with nothing more than occasional cleaning.

2.4 Low Maintenance

For busy homeowners in Sussex or Hampshire, low maintenance is a major selling point. Aluminium orangeries need only:

• Occasional washing with soapy water to remove dirt
• Annual gutter and drainage checks
• Lubrication of hinges and locks (every 2-3 years)

No painting, staining, or preservative treatments are required.

2.5 Design Flexibility

Aluminium can be fabricated into virtually any shape, supporting bespoke designs:

• Colours: Any RAL colour available – anthracite grey (most popular), black, cream, green, grey, white
• Dual-colour options: Different colour inside and out (e.g., white internally, anthracite externally)
• Door integration: Seamlessly incorporate bifold, sliding, or French doors in matching aluminium
• Lantern styles: Pyramid, ridge, or bespoke lantern designs

2.6 Sustainability

Aluminium is 100% recyclable without loss of quality. The UK aluminium industry recycles approximately 75% of all aluminium produced. Choosing aluminium supports circular economy principles and reduces environmental impact compared to materials that end up in landfill.

3. Aluminium vs Timber vs uPVC: Comparison

Choosing between aluminium, timber, and uPVC depends on your priorities – budget, aesthetics, maintenance, and longevity. This comparison helps homeowners in Kent, Surrey, and beyond make informed decisions.

3.1 When to Choose Aluminium

Aluminium is ideal for:

• Contemporary homes requiring slim sightlines
• Maximum light and garden views
• Low-maintenance lifestyles
• Long-term investment (50+ years)
• Bespoke designs and custom colours

3.2 When Timber Might Be Better

Timber suits:

• Period properties where traditional appearance is paramount
• Listed buildings requiring authentic materials
• Homeowners willing to maintain regularly
• Lower initial budgets (though lifetime costs may equal aluminium)

3.3 When uPVC Might Be Considered

uPVC is appropriate for:

• Tight budgets where initial cost is the only factor
• Short-term ownership (under 10 years)
• Less demanding aesthetic requirements
• Properties where appearance is not critical

However, many homeowners find that the long-term value and aesthetics of aluminium justify the higher initial investment.

4. Aluminium Orangery Costs 2026 (UK Guide)

Understanding costs helps with budgeting and comparing quotes. Prices vary based on size, complexity, glazing specification, and site conditions. Below are typical ranges for aluminium orangeries in 2026.

5. Thermal Performance: How Warm Are Aluminium Orangeries?

Modern aluminium orangeries are designed to be comfortable year-round, addressing the historic reputation of glass structures being too hot in summer and too cold in winter. Key technologies include:

5.1 Thermal Break Technology

A thermal break is an insulating barrier (typically polyamide) inserted between the interior and exterior aluminium profiles. This prevents thermal bridging – the direct transfer of heat through the metal. Without thermal breaks, aluminium would conduct heat readily; with them, U-values drop dramatically.

5.2 High-Performance Glazing

Aluminium orangeries use sealed double or triple glazed units with:

• Low-E coatings: Microscopic metallic layers that reflect heat back into the room while allowing light through
• Argon or krypton gas fills: Inert gases between panes provide better insulation than air
• Warm edge spacers: Insulating spacer bars reduce heat loss at pane edges

5.3 Solar Control

For south-facing orangeries, solar control glass can be specified. This incorporates coatings that reflect solar infrared radiation, blocking up to 86% of solar heat while maintaining high light transmission. This prevents overheating in summer without darkening the interior.

5.4 Typical U-Values Achieved

• Standard double glazing: U-value 1.6 – 1.8 W/m²K
• Low-E double glazing with argon: 1.2 – 1.4 W/m²K
• Triple glazing with Low-E and argon: 0.8 – 1.0 W/m²K

Building Regulations Part L typically require U-values of 1.6 W/m²K or better for new extensions, so even basic specifications meet standards.

5.5 Ventilation Considerations

To maintain comfort, roof vents or automated opening windows are essential. Building Regulations require adequate ventilation – typically at least 1/20th of floor area as openable area. Modern aluminium orangeries can integrate:

• Electric roof vents with rain sensors
• Automated window openers linked to thermostats
• Manual vents for simple operation

6. Aluminium Orangery Design Options

Aluminium’s versatility enables a wide range of design styles, from ultra-modern to traditional heritage. Here are key design considerations for homeowners in Kent, Surrey, Sussex, Hampshire, and London.

6.1 Lantern Roof Styles

• Pyramid lantern: Classic four-sided glazed roof rising to a point, suits traditional and contemporary designs
• Ridge lantern: Long, rectangular lantern running the length of the roof, ideal for modern extensions
• Multi-pitch lantern: Complex designs with multiple glazed sections for dramatic effect
• Flat glass roof: Minimalist option with frameless glazing for ultra-modern look

6.2 Colour Options

Aluminium can be powder-coated in virtually any RAL colour. Popular choices include:

• Anthracite grey (RAL 7016): Most popular – sophisticated, modern, architectural
• Black (RAL 9005): Dramatic, contemporary, bold
• Cream (RAL 9001): Traditional, suits period properties
• Green (RAL 6005): Heritage colour for rural settings
• White (RAL 9016): Classic, safe choice
• Grey (various): Light grey, silver, metallic finishes

Dual-colour option: Different colour inside and out – e.g., white internally for brightness, anthracite externally for kerb appeal.

6.3 Door Integration

• Bifold doors: Multiple panels fold and stack, creating wide openings (up to 6-8m spans)
• Sliding doors: Panels slide horizontally, space-saving, ideal where swing space limited
• French doors: Traditional double doors, outward opening
• Pivot doors: Large format doors that pivot open, dramatic entrance statements

All door types can be manufactured in matching aluminium, ensuring cohesive design.

6.4 Base Wall Options

• Dwarf walls: 600-900mm high brick/stone walls, providing insulation and traditional appearance
• Full-height glazing: Glass from floor to ceiling, maximising views, requires high-performance glazing
• Aluminium columns: Structural aluminium posts supporting roof, creating open feel

7. Planning Permission for Aluminium Orangeries

Understanding planning requirements is crucial before starting your project. Most aluminium orangeries fall under Permitted Development rights, but exceptions apply.

7.1 Permitted Development Conditions

Your aluminium orangery may not need planning permission if it meets all these criteria:

• Single storey with maximum eaves height of 3m
• Maximum height of 4m (if within 2m of boundary, height limited to 3m)
• Doesn’t extend beyond the rear wall by more than 3m (semi/terraced) or 4m (detached)
• Doesn’t cover more than half the garden area
• Materials similar to existing house (aluminium acceptable)
• Not forward of principal elevation facing a highway
• No verandas, balconies, or raised platforms

7.2 When Planning Permission IS Required

You WILL need planning permission if:

• Your property is listed (plus Listed Building Consent required)
• You’re in a Conservation Area, National Park, AONB, or World Heritage Site
• Previous extensions have used your Permitted Development allowance
• You exceed size/height limits
• Your property has Article 4 Direction removing PD rights
• Building a detached orangery in some circumstances

7.3 Listed Buildings and Conservation Areas

Aluminium can be suitable for listed buildings if designed sensitively. Conservation officers often prefer aluminium for its slim sightlines and clear distinction between old and new. However, you’ll need both Listed Building Consent and planning permission. Heritage colours (cream, green) and traditional proportions help gain approval.

Room Outside has extensive experience with listed property extensions across Sussex, Surrey, and Hampshire.

7.4 Building Regulations

All orangeries must comply with Building Regulations covering:

• Part L (Conservation of fuel and power): Thermal performance standards
• Part A (Structure): Structural integrity
• Part B (Fire safety): Escape routes and fire resistance
• Part F (Ventilation): Adequate ventilation
• Part K (Protection from falling): Glazing safety

Reputable installers like Room Outside handle Building Regulations approval as part of the service.

8. Aluminium Orangery Installation Process

Understanding the installation timeline helps with planning. Typical projects take 12-20 weeks from deposit to completion.

Stage 1: Initial Consultation (Week 1-2)

Site survey, discuss requirements, budget, and design preferences. Assess planning needs and access constraints.

Stage 2: Design and Quotation (Weeks 3-6)

Detailed designs, 3D visuals, and itemised quotation. Finalise glazing specifications, colours, and door choices.

Stage 3: Planning and Approvals (Weeks 6-12)

Submit planning application if required. Prepare Building Regulations submission. Listed Building Consent applications may take longer.

Stage 4: Manufacture (Weeks 8-14)

Aluminium frames fabricated off-site. Quality control ensures precision.

Stage 5: Groundworks and Foundations (Weeks 10-16)

Excavate foundations, pour concrete, install drainage. Prepare site for frame delivery.

Stage 6: Installation (Weeks 14-18)

Erect aluminium frame, install glazing, fit roof lantern, doors, and windows. Make weathertight.

Stage 7: Finishing (Weeks 16-20)

Internal plastering, electrics, heating, flooring, decoration. Final snagging and handover.

9. Aluminium Orangery vs Glass Box Extension

Homeowners often compare orangeries with glass box extensions. Key differences:

• Roof design: Orangeries have solid perimeter roof with glass lantern; glass boxes have fully glazed roof
• Privacy: Orangeries offer more privacy due to solid roof sections; glass boxes are fully transparent
• Thermal efficiency: Orangeries typically more thermally efficient due to solid roof insulation
• Aesthetics: Orangeries feel more architectural; glass boxes more minimalist
• Cost: Glass boxes often more expensive due to structural glass requirements

Both can be constructed in aluminium, offering slim frames and durability. The choice depends on desired appearance and performance priorities.

10. Common Myths About Aluminium Orangeries

Myth: “Aluminium orangeries are cold”

Fact: Modern thermally broken aluminium frames achieve U-values as low as 1.2 W/m²K – comparable to solid walls. Combined with high-performance glazing, they’re warm in winter and cool in summer.

Myth: “Aluminium is only for modern homes”

Fact: Aluminium can be powder-coated in heritage colours (cream, green, grey) and designed with traditional proportions, making it suitable for period properties and listed buildings.

Myth: “Aluminium orangeries are too expensive”

Fact: While initial costs are higher than uPVC, the 50+ year lifespan and minimal maintenance make aluminium cost-effective over time. Property value uplift often exceeds the additional investment.

Myth: “Aluminium frames look industrial”

Fact: Modern aluminium profiles are slim and elegant, with smooth powder-coated finishes. They don’t have the industrial appearance of raw aluminium.

Myth: “You can’t get curved aluminium frames”

Fact: Aluminium can be curved during manufacture, enabling bespoke arched windows, curved lanterns, and unique architectural features.

11. Aluminium Orangeries in Your Area

Room Outside serves homeowners across Southern England with aluminium orangery installations. Local considerations:

Aluminium Orangeries Kent

Kent’s mix of Wealden villages, coastal towns, and London commuter belt means diverse property types. We handle everything from modern extensions in Tunbridge Wells to heritage projects in Canterbury.

Aluminium Orangeries Surrey

Surrey’s affluent suburbs and green belt locations demand high-quality finishes. Aluminium orangeries in Guildford, Woking, and Esher often feature anthracite grey frames with bifold doors.

Aluminium Orangeries Sussex (East and West)

From Brighton’s contemporary homes to Chichester’s historic properties, aluminium suits both. We’ve installed orangeries across Sussex with heritage colours for listed buildings.

Aluminium Orangeries Hampshire

Hampshire’s New Forest, Winchester, and Southampton areas require sensitivity to conservation constraints. We navigate planning successfully.

Aluminium Orangeries London

London projects often involve tight sites, listed buildings, and conservation areas. Our experience ensures compliance and beautiful results.

Aluminium Orangeries Berkshire, Dorset, Essex

We also serve Berkshire, Dorset, and parts of Essex, bringing the same expertise and quality.

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