Aluminium Extensions
Aluminium Extensions – Light-Filled and Energy-Efficient
Commercial & Domestic Aluminium Ltd (CDA) designs, supplies and installs premium aluminium extensions for homes and commercial properties across the UK. Whether you’re building a garden room in Cornwall, a rear extension in Manchester, or a kitchen‑diner addition in Edinburgh, our expert team delivers fully bespoke aluminium‑framed extensions engineered for style, comfort, and lasting performance.
Our aluminium extensions combine contemporary design, large glazing areas, and high-performance thermal performance, letting natural light flood your space while ensuring energy efficiency and year‑round comfort. Thanks to slim, strong aluminium frames, powder‑coated finishes and modern glazing systems, our extensions are durable, low‑maintenance, and tailored to complement both traditional and modern properties.
Why Choose an Aluminium Extension?
We design, fabricate, and install aluminium extensions tailored to each project. We partner with Smart Architectural Aluminium and Comar Architectural Aluminium Systems to deliver fully certified products for both domestic and commercial projects.
Our extensions are sustainable with fully recyclable aluminium and an efficient building envelope. They can provide seamless access by integrating ultra-slim sliding or bifold door systems to open up the space.
Contemporary Rear Extensions
Clean lines, large panes, minimal sightlines.
Kitchen/Dining Extensions
Create a bright hub with sliding or bifold doors to the garden.
Orangeries & Modern Conservatories
Highly insulated aluminium/glass structures for all-season use.
Garden Rooms & Home Offices
Comfortable, energy-efficient spaces that outperform legacy uPVC builds.
“We manufacture and install aluminium extensions to the highest standards, with a focus on longevity, security, and style.”
Slim, Strong Frames
Custom Design
Flat roofs with rooflights, pitched/glazed roofs, or glass-box concepts.
Durable & Low-Maintenance
Year-Round Comfort
Useful Information
Our Aluminium Extensions
Aluminium Extensions Performance & Technical Spec
| Feature | Typical Range / Notes |
|---|---|
| Thermal performance | Approx. 1.0–1.6 W/m²K achieved with modern IGUs and thermal breaks |
| Acoustic reduction | Up to ~45 dB Rw with acoustic laminated glazing |
| Weather resistance | Engineered for UK exposure zones; tested to air/water/wind standards |
| Solar control | Low-E & solar-control coatings, warm-edge spacers, argon/triple options |
| Ventilation | Trickle vents, roof vents, purge ventilation & shading strategies |
Values are indicative; we verify against your chosen system and final design.
Doors, Windows & Roof Options (Integrated Systems)
- Ultra-slim sliding doors for panoramic views and effortless operation.
- Bifold doors to create a wide, fully openable aperture in good weather.
- Fixed picture windows, frameless corners, and rooflights/lanterns to flood spaces with daylight.
- Aluminium conservatory/orangery roof systems for insulated, all-year-use spaces.
Colours & Finishes
Choose from over 200 RAL colours with matt, gloss, or textured powder coating.
Dual-colour (inside/outside) and anodised options available for coastal durability.
Planning, Regulations & Practicalities
Many extensions fall under Permitted Development (PD), but conservation areas, listed buildings, and larger projects may require planning consent. We handle drawings, structural input and Building Regulations (Part L energy, Part F ventilation, Part K safety glazing, Part Q security).
Avoid common pitfalls by addressing insulation, shading and ventilation at the design stage.
Our Installation Process
Every project is handled from design to completion by our in-house experts.
- Concept & Budget – brief, options, guide pricing
- Survey & Design – site measure, drawings, specification
- Planning / PD – as required (we prepare submissions)
- Fabrication – made-to-measure aluminium systems
- Installation – qualified fitters, site QA
- Snag & Handover – warranty & maintenance pack
Lead times depend on scope and planning route.
Aluminium vs uPVC or Timber (Why Aluminium Wins)
- Slimmer sightlines → more glass, more light
- Superior strength & lifespan → great for large panes/doors
- Lower maintenance → powder-coated finish
- Sustainability → fully recyclable aluminium frame
Warranties & Aftercare
- 10-year warranty on frames/hardware (system-dependent)
- 5-year glazing warranty
- Simple maintenance: wash frames 2×/year, keep drains/vents clear, lubricate moving parts annually
Where we install aluminium extensions
We are happy to work anywhere in the South, including Hampshire, Sussex, Devon, Surrey, and Kent, as well as the Midlands, including Worcestershire and Leicestershire.
Extension FAQs
Do aluminium extensions overheat?
We design for comfort with solar-control glass, shading, ventilation and thermal modelling to reduce summer gains while retaining winter warmth.
Are they suitable for year-round use?
What door systems work best?
Ultra-slim sliding for panoramic views; bifolds for a fully openable wall. Many projects combine both, depending on orientation and use.
Can you match existing windows/doors?
Do you manage planning and Building Regulations?
We only use high-quality products in our installations. All our systems comply with BS EN 14351-1 and Building Regulations Part L
Brochures
Aluminium Doors Brochure
