Direct factory access to highly customized residential and commercial security and sliding entrance system designs.
Zhejiang Larsom Door Co., Ltd. is a professional manufacturer specializing in the research, development, production, and global sales of high-quality security doors, armored doors, steel-wood doors, and customized entrance door solutions.
Since its establishment, Larsom Door has been committed to providing customers around the world with safe, durable, and stylish door products. Today, the company operates a modern manufacturing facility covering more than 16,000 square meters, supported by an experienced team of over 160 skilled employees. With advanced production management and efficient manufacturing systems, our daily production capacity exceeds 200 sets of premium doors, enabling us to meet both large-scale projects and customized orders with reliable delivery.
Guided by the philosophy of "Quality First, Customer Foremost, Innovation for the Future," Zhejiang Larsom Door Co., Ltd. continues to improve its manufacturing capabilities, expand its international market presence, and build long-term partnerships with customers around the world.
To continuously improve product quality and manufacturing efficiency, Larsom Door has invested heavily in advanced automated production equipment. From raw materials processing to UV protective coating, each station meets strict international quality standards.
Our high-speed turret punching systems and automatic milling stations machine lock pockets, hinge recesses, and smart integration channels with sub-millimeter tolerances. This ensures a seamless hardware fit for modern security standards.
Analyzing structural performance, wood stabilization mechanisms, global compliance parameters, and manufacturing supply chain dynamics.
“An architect's vision requires the raw, tactile integrity of natural solid timber; modern regulatory environments demand structural tightness, thermal efficiency, and long-term geometric stability. The CE-certified French door represents the ultimate resolution of these two conflicting demands.”
For European construction markets and international developments referencing European norms, CE certification is not simply a decorative stamp—it is a legal mandate under the Construction Products Regulation (CPR). Under standard EN 14351-1, windows and external pedestrian doorsets must demonstrate verified compliance across critical mechanical and thermal characteristics.
The testing protocol for a solid wood French door involves verifying resistance to wind load, water tightness, air permeability, acoustic insulation performance, and primary thermal transmittance (U-value). Because solid timber is a natural anisotropic material—one that shifts, expands, and contracts dynamically with atmospheric relative humidity—meeting these requirements demands precision woodworking and specialized engineering.
The primary issue with historic solid timber doors is warping, twisting, and cracking over seasonal transitions. At Zhejiang Larsom Door Co., Ltd., we tackle these challenges through an engineered, multi-layered wood technology route. Instead of using a single solid timber block, which contains natural internal stresses, our premium French doors utilize three-layer or four-layer engineered timber blanks.
In this process, the wood grain of each layer is oriented perpendicular to the adjacent layer. Any internal stress or movement within one layer is countered by the opposing grain direction of the next layer. This structured alignment minimizes warp and twist, ensuring that the door frame remains geometrically stable under harsh exposure to rain, sun, and snow.
We dry our raw lumber to a strict 8% to 12% moisture content range, stabilizing the cell structure before milling.
Adhered using EN 204 Class D4 polyurethane adhesives, providing water-proof and boil-proof bond lines.
Coated with multi-stage waterborne acrylic elastomeric sealants that shield timber from UV radiation and moisture absorption.
Building regulations and aesthetic expectations vary widely across regional B2B markets. A door profile designed for a Mediterranean resort will not suit a residential development in Scandinavia or the United Kingdom.
In the British market, building regulations mandate strict thermal efficiency benchmarks, requiring U-values lower than 1.4 W/m²K for external doors. Our French doors feature Argon-filled double or triple glazing packages with Low-E coatings. Furthermore, to satisfy security regulations, our manufacturing lines integrate multi-point lock systems with hooks and deadbolts tested to meet security standard PAS 24.
In cold climates, standard wood doors can suffer from freeze-thaw cycles. To prevent this, we offer engineered Pine and Larch profiles treated with non-toxic preservatives. These doors are paired with low-profile thermal-break thresholds that allow wheelchairs to pass easily while preventing frost bridges.
China's manufacturing capability is built on reliable material sourcing, high-speed automated processing, and efficient logistics. At Zhejiang Larsom Door Co., Ltd., our 16,000-square-meter facility brings together automated CNC processing centers, laser metal cutting, and a dust-free finishing department.
This vertically integrated manufacturing model allows us to control quality at every step. While small workshops must outsource metal reinforcement plates or complex frame profiles, we process our structural steel reinforcements, custom aluminum parts, and timber components under one roof. Our CNC machining stations drill and pocket hardware mounting points automatically, keeping tolerances under 0.1 mm. This precision reduces errors during on-site installation and lowers labor costs for construction contractors.
The architectural landscape is shifting toward decarbonization and smart building systems. The next generation of solid wood French doors will feature advanced tech integrations:
Expand your design offerings with our modern pivot systems, interior acoustic doors, and sliding partition panels.
Larsom Door