Soundproof • Patio
Factory Portfolio
Precision Fenestration Systems for London Developers & Architects
Explore our export-grade fenestration profiles configured specifically to balance acoustic attenuation along TfL transport corridors with ultra-low thermal transmittance matching UK Approved Document L standards.
Triple Glazed
Passive House Certified
Low-E • Casement
PVDF • Commercial
Timber Cladding
High Security Entry
Motorized Vertical
Engineering Whitepaper
Structural Anatomy of Aluminum-Clad Timber Systems for Greater London
In the challenging microclimate of the United Kingdom capital, fenestration faces a complex duality: exterior surfaces must withstand continuous driving rain, atmospheric acid pollutants, and seasonal damp, while interiors require warm, authentic natural timber textures that complement London's timeless residential heritage.
0.79 W/m²K
Passive House U-Value
Surpasses UK Approved Document L 2025 targets with triple Low-E warm-edge IGUs.
48 dB
Acoustic Reduction
Multi-layer acoustic PVB interlayer shields homes near Heathrow flight paths & Tube lines.
Class 4 / 9A / C5
Weather Tightness
Tested to BS EN 12207 air permeability, EN 12208 water tightness, & EN 12210 wind resistance.
PAS 24:2022
Security Standards
Approved Document Q compliance featuring multi-point perimeter gear locking systems.
Dual-Frame Floating Clip Technology
Aluminum and timber expand and contract at fundamentally divergent thermal coefficients. Our precision OEM manufacturing deploys multi-axis nylon-polymer composite clips that mechanically couple the external 6063-T6 aluminum shell to the internal timber substrate without rigid fastening.
This floating architectural interface forms an intentional 6mm continuous capillary back-ventilation cavity, ensuring that any residual condensation dissipates instantly while preventing timber warp, stress fracture, or finish delamination under extreme temperature swings.
- Eliminates thermal bridging between materials
- Accommodates micro-movement without frame stress
- Hydrophobic drainage channels integrated into the sub-sill
Multi-Cavity PA66 GF25 Polyamide Breaks
Standard architectural aluminum transfers interior warmth outdoors rapidly. Our custom extrusions incorporate 34mm multi-chambered polyamide insulation bars reinforced with 25% continuous fiberglass strands (PA66 GF25).
This thermal barrier breaks energy conductivity completely. When combined with argon-gas-filled triple-glazed panels with double silver magnetron sputtering Low-E glass, our assemblies deliver exceptional condensation resistance factors (CRF) that safeguard internal plaster finishes from mold growth.
- Uw values down to 0.79 W/m²K on tilt-and-turn configurations
- Warm-edge composite spacers (Swisspacer Ultimate / Technoform)
- Helps achieve BREEAM 'Outstanding' building ratings
Sustainably Harvested FSC Timber Substrates
The interior visual warmth is rooted in defect-free, four-layer cross-laminated timber billets sourced strictly from FSC-certified slow-grown Nordic Pine, European White Oak, or American Black Walnut.
Radial and tangential grain patterns are systematically counter-glued under industrial hydraulic pressure using D4 DIN EN 204 waterproof polyurethane adhesives, neutralising natural grain tensions and guaranteeing absolute dimensional stability even in moisture-prone ground-floor wet rooms and kitchens.
- Multi-stage organic micro-porous waterborne Remmers finishes
- Zero VOC emission levels compliant with indoor air standards
- Custom RAL color matching for historical interior woodwork
Urban Architecture Scenarios
Engineered Specifically for London's Strict Planning Contexts
From the red-brick Victorian terraces of Kensington and Chelsea to the sleek glass penthouses along Canary Wharf, London's built environment imposes stringent structural, acoustic, and heritage constraints that mass-produced windows fail to satisfy.
Conservation Areas & Article 4 Directions
Boroughs: Royal Borough of Kensington & Chelsea, Westminster, Camden, Islington.
Planning officers frequently reject bulky modern window extrusions that alter historical streetscapes. Our OEM manufacturing precisely replicates authentic 19th-century sightlines using bespoke aluminum exterior putty-line profiles (45-degree heritage chamfers) coupled with hand-finished interior timber astragal bars.
This allows London developers to secure Conservation Planning approvals while embedding contemporary triple-glazing efficiency inside an outwardly heritage-accurate profile.
- Ultra-slim 54mm profile sightline options
- Concealed friction hinges preserving external lines
- Deep bottom rail options reflecting historic sash proportions
Acoustic Isolation Along Rail & Flight Corridors
Locations: Heathrow flight paths (Richmond, Hounslow), Elizabeth Line & Overground trackside residential infills.
Urban acoustic pollution undermines premium London residential asset valuations. We formulate asymmetrical acoustic glazing suites (e.g., 8.8mm acoustic laminated outer + 16mm warm-edge cavity with 90% Argon gas + 6mm toughened inner glass).
Combined with triple EPDM continuous automotive-grade gasket seals, our casement and tilt-and-turn units achieve field attenuation ratings up to Rw 48 dB, eliminating low-frequency locomotive hums and urban sirens.
- Certified Sound Transmission Class (STC) test reports
- Dissimilar glass thicknesses preventing resonance frequency
- Heavy-duty German Siegenia/Roto multi-point cam locking seals
High-Rise Luxury Developments & Riverside Wharf Penthouses
Locations: Battersea Power Station corridor, South Bank, Nine Elms, Docklands.
Riverside exposure exposes facade elements to intense vortex wind loads up to 2400 Pascals (Class C5). Our heavy-duty structural corner joints are hydraulically crimped with reinforced die-cast corner cleats and injected with two-component polyurethane bonding sealant.
Exterior powder coatings feature marine-grade Qualicoat Class 2 or AkzoNobel Interpon D2525 fluorocarbon (PVDF) finishes that completely resist micro-corrosion from maritime Thames salt mist and urban industrial smog.
- Deflection limit tested to 1/300 under wind pressure
- Qualicoat Seaside-class anti-corrosion exterior guarantee
- Motorized smart rain-sensing integration capabilities
London Specification Advisory: For basement digs and lightwell extensions typical in Belgravia and Mayfair, our motorized vertical-sliding and oversized tilt-and-slide products deliver unobstructed natural light and passive ventilation while meeting London Building Control egress requirements (clear openable area ≥ 0.33 m² with minimum dimensions of 450mm).
Market Dynamics
Key Market Drivers Shaping London Fenestration Specifications
A fundamental transformation is sweeping the London property development sector, driven by statutory decarbonisation policies, evolving building regulations, and a discerning luxury demographic.
The Future Homes Standard 2025 Preparedness
The UK government's tightening of Approved Document L demands that all new domestic dwellings achieve a minimum 31% reduction in carbon emissions compared to previous benchmarks, pushing whole-window U-values down toward 0.8 to 1.2 W/m²K.
Standard UPVC and basic thermal-break aluminum frames struggle to hit these numbers without unattractive, bulky sightlines. Aluminum-clad timber stands out as the ultimate commercial solution, fusing aluminum's low lifecycle maintenance with timber's superior natural thermal mass.
Biophilic Architecture & Wellness Real Estate
High-net-worth London homebuyers in areas like Hampstead, St John's Wood, and Chelsea place a massive premium on natural tactile elements. The interior warmth of natural oak, larch, and walnut relieves clinical urban aesthetics and promotes biophilic occupant wellbeing.
By specifying aluminum clad wood windows, architects provide homeowners with organic architectural timber finishes indoors while preserving a weather-resistant, maintenance-free metal exterior that eliminates periodic scaffolding and exterior painting costs.
Stringent Security: Approved Document Q & SBD
Metropolitan Police initiatives and London planning mandates insist on robust perimeter defense (Secured by Design principles). Ground floor and easily accessible first-floor fenestration must pass the rigorous forced-entry simulations of PAS 24:2022.
Our custom factory production integrates full perimeter mushroom cams, hardened anti-drill gearbox plates, internal glazing beads that prohibit pane removal from outside, and Class P4A laminated safety glass cores.
| Performance Characteristic | Standard UK uPVC Window | Standard Thermally Broken Aluminum | DERCHI Architectural Aluminum-Clad Timber |
|---|---|---|---|
| Typical Uw-Value | 1.3 – 1.5 W/m²K | 1.4 – 1.6 W/m²K | 0.79 – 1.1 W/m²K (Passivhaus Ready) |
| Acoustic Rating (Rw) | 28 – 32 dB | 30 – 35 dB | Up to 48 dB (Acoustic Laminated Core) |
| Conservation Area Suitability | Very Low (Frequently Rejected) | Moderate (Modern Schemes Only) | High (Approved in Westminster / RBKC) |
| Expected Service Life | 15 – 20 Years | 25 – 30 Years | 50+ Years (Marine Exterior + D4 Timber) |
| Maintenance Cycle | UV Yellowing; Seal Failure | Periodic Washdown | Zero Exterior Repainting Needed |
Manufacturing Capability
World-Class OEM/ODM Precision from an Industrial Powerhouse
Headquartered in Foshan, Guangdong—the epicentre of advanced global aluminum engineering—Guangdong Dejiyoupin Doors and Windows Co., Ltd. (DERCHI) stands among the premier Top 10 fenestration manufacturers in China. For over 25 years, our facility has executed precision OEM contracts for landmark residential and commercial developments globally.
Massive Scale Meets Micro-Millimetre Tolerance
Spanning a modern 180,000 m² integrated production base with over 600+ skilled engineers, artisans, and technicians, our automated manufacturing lines integrate German CNC 5-axis profile machining centres, automated European double-mitre saw arrays, and computerized static pressure dust-free cleanrooms for insulated glass assembly.
We hold over 100+ global patents and international product certifications, including CE, ISO9001, AS2047, and UL fire ratings. When partnering with London architectural firms, main contractors, and bespoke home builders, we provide complete technical transparency: full structural calculations, thermal finite-element analysis (THERM modeling), wind-deflection shop drawings, and free BIM/Revit libraries.
180,000㎡
Industrial Base
25+ Years
OEM/ODM Excellence
1. Architectural CAD & Schedule Review
Submit your architectural elevations and window schedules. Our dedicated project engineering desk verifies all structural loads, opening egresses, and local council requirements.
2. Free Shop Drawings & 3D Modeling
Within 48 hours, we supply full CAD interface connection details, perimeter sealant and cavity closer recommendations, and accurate section cuts for direct client sign-off.
3. Precision CNC Machining & In-Line QC
Automated cutting, multi-layer timber lamination, multi-point lock hardware fitting, and pressurized helium seal checks ensure flawless factory-controlled tolerances.
4. Crated Ocean Freight Direct to UK Ports
Fully fumigated steel-reinforced timber crating with desiccant protection. Direct shipping to London Gateway, Felixstowe, or Southampton with full customs documentation.
London Procurement Guide
Frequently Asked Questions by UK Quantity Surveyors, Architects & Builders
Direct, technically verifiable answers addressing compliance, logistics, warranty protocols, and site installation across Greater London and the Home Counties.
How do your aluminum-clad timber systems comply with UK Building Regulations Approved Document L (2025 updates)?
Our systems exceed the current UK Approved Document L whole-window performance requirements (1.4 W/m²K for replacements, 1.2 W/m²K for new dwellings). Configured with our standard triple-glazed warm-edge units (argon fill, double Low-E soft coating), our aluminum-clad wood casement and tilt-and-turn assemblies achieve a whole-window U-value (Uw) down to 0.79 – 0.95 W/m²K. Complete thermal simulation reports conforming to BS EN ISO 10077-1 and 10077-2 are supplied with every quotation to support your SAP / BREEAM energy compliance calculations.
Can your products satisfy planning officers in London Conservation Areas and Listed Curtilages?
Yes. We frequently supply projects in conservation hotspots across Westminster, Camden, Islington, and Kensington & Chelsea. We manufacture customized narrow-frame heritage profiles that emulate historical sash and casement sightlines, featuring authentic 45-degree exterior putty-line chamfers, traditional 24mm or 32mm interior Georgian / Victorian astragal bars, and deep traditional bottom rails. We provide free scaled architectural cross-section cuts (DWG and PDF format) for inclusion within your planning application package.
What are your typical manufacturing lead times and ocean shipping timelines to London?
From the date of formal shop-drawing sign-off, standard OEM production takes 25 to 35 calendar days. Ocean freight from our Foshan facility (via Nansha or Yantian port) directly to London Gateway, Felixstowe, or Southampton averages 26 to 32 days. We recommend London clients incorporate an overall timeline of approximately 8 to 10 weeks from deposit to site delivery. For critical fast-track developments, expedited production queues and bonded warehousing options are available upon consultation.
How do you ensure weather tightness and corrosion protection in London’s damp, urban-industrial environment?
Our exterior aluminum casings are extruded from virgin 6063-T6 architectural grade alloy and finished using premium AkzoNobel or PPG fluorocarbon (PVDF) powder coats compliant with Qualicoat Seaside class standards. This treatment provides impenetrable defense against atmospheric sulfur dioxide (SO₂), urban nitrogen oxides (NOx), and acid moisture. Internally, the timber is isolated from external condensation by a continuous 6mm pressure-equalized capillary cavity, eliminating the moisture entrapment that plagues traditional wooden windows.
How are oversized or heavy window units packaged to prevent damage during international shipping?
Every window and door unit is wrapped in heavy-duty 50-micron scratch-resistant protective polyethylene film, fitted with reinforced high-density corner buffers, and enclosed within custom-engineered, fully enclosed, ISPM-15 heat-treated plywood crates. Corner lifting brackets and palletized footings allow safe crane or counterbalance forklift offloading on tight London construction sites. Desiccant packs are inserted into every crate to completely eliminate in-transit container moisture.
Do your locking mechanisms comply with UK Approved Document Q security mandates?
All our residential and commercial assemblies comply with PAS 24:2022 standards and meet the legal requirements of Approved Document Q. We utilize world-renowned German hardware systems (Siegenia, Roto, or GU) featuring multi-point mushroom-head cams, reinforced heavy-duty anti-jemmy strike plates, and key-locking sash restrictors. Glass panes are internally beaded, preventing external glass removal by potential intruders.
What warranties and technical site installation support do you provide to UK contractors?
DERCHI offers a comprehensive 10-year comprehensive factory warranty on insulated glass units against seal failure/fogging, a 15-year warranty on exterior aluminum powder coatings against fading/chalking, and a 10-year warranty on mechanical multi-point operating hardware. We provide comprehensive step-by-step 3D visual installation manuals, cavity closer integration drawings, and real-time video engineering support aligned with UK working hours.
Master Specification Data
Technical Specification Schedule for Quantity Surveyors & Specifiers
Use the following technical parameters when compiling NBS (National Building Specification) documentation or project tender schedules for high-end residential fenestration packages.
| Component Category | Architectural Factory Specification | Standard / Regulation |
|---|---|---|
| Exterior Shell Alloy | 6063-T6 High-Tensile Architectural Extruded Aluminum Alloy | BS EN 755-9 / BS EN 12020 |
| Internal Timber Core | FSC-Certified 4-Layer Cross-Glued Laminated Nordic Pine / Oak / Walnut | EN 14220 / DIN 68360 |
| Thermal Isolator | 34mm Multi-Cavity PA66 GF25 Polyamide Thermal Barrier | DIN EN 14024 |
| Insulated Glass Unit (IGU) | Triple Glazed (4mm Low-E + 16mm Argon Warm Edge + 4mm Clear + 16mm Argon + 4mm Low-E) | BS EN 1279 Parts 1-6 |
| Acoustic Glazing (Optional) | Up to 48.8mm Acoustic Laminated Sound-Control Glass Core (Rw 42 to 48 dB) | BS EN ISO 10140 / BS EN 717-1 |
| Exterior Finish / Coating | AkzoNobel Interpon D2525 / PVDF Fluorocarbon 3-Coat System (≥ 60 microns) | Qualicoat Class 2 / AAMA 2605 |
| Internal Timber Coating | Remmers 4-Stage Waterborne Eco-Friendly Microporous Stain / Lacquer | DIN EN 71-3 (Child/Food Safe) |
| Operating Hardware | Concealed German Siegenia Titan AF / Roto NX Multi-Point Perimeter Locking | BS EN 13126 / PAS 24:2022 |
| Perimeter Weatherseals | Triple High-Resilience Continuous Co-Extruded EPDM Gaskets | DIN 7863 / BS EN 12365 |
| Air Permeability | Class 4 (600 Pa test pressure with minimal leakage) | BS EN 12207 |
| Water Tightness | Class E900 / 9A (Zero ingress at 900 Pa continuous dynamic spray) | BS EN 12208 |
| Wind Resistance | Class C5 (2000 Pa design wind pressure, safety test to 3000 Pa) | BS EN 12210 |
Looking for Custom London Shop Drawings or Fast Estimations?
Our technical team responds within 24 hours with comprehensive preliminary schedules, U-value ratings, and volume CIF quotations tailored to your exact bill of quantities.
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