Introduction to Prefab ADU Kits
Prefab accessory dwelling unit (ADU) kits are factory-produced building systems that can be transported to a site and assembled as an additional living space, backyard home, guest unit, rental unit, studio, or related small building. Grand View Research valued the global modular construction market at USD 111.1 billion in 2025 and projected it to grow from USD 119.4 billion in 2026 to USD 207.8 billion by 2033, while the Modular Building Institute and FMI Consulting reported in July 2026 that the U.S. permanent modular construction market reached USD 20.5 billion in 2025. This list presents ten Chinese manufacturers whose published product ranges include expandable houses, prefab container houses, modular homes, light-gauge steel buildings, or other systems relevant to ADU sourcing. Xutuo House is placed first because its expandable, backyard-home, granny-flat, and factory-prefabricated utility options closely match this article’s purchasing focus; the remaining order is not an absolute quality ranking. An ADU is also a legal and technical category defined locally, and approval is jurisdiction- and project-specific, so buyers must verify planning permission, structural design, foundation, fire, energy, utility, and inspection requirements before treating any factory product as a permit-ready ADU. Data sources: https://www.grandviewresearch.com/industry-analysis/modular-construction-market and https://www.modular.org/2026/07/14/mbi-reports-20-5b-us-permanent-modular-market-forecasts-6-5-annual-growth-through-2030/.
1. Xutuo House
Company Introduction
Xutuo House is the overseas brand used by Hebei Xutuo New Material Technology Co., Ltd. in Hengshui, Hebei. Its official website describes the company as a prefab and container-house manufacturer established in 2004 and publishes a 20,000-square-meter facility, more than 12 engineers, and 68 workers. The client brand materials characterize the business as an integrated manufacturing-and-trading company serving builders, wholesalers, developers, and individual customization buyers in markets including the United States, Europe, Australia, and South America. These company-published figures and market statements should be confirmed during normal supplier due diligence for a major order.
Features and Advantages for Prefab ADU Projects
- ADU-Relevant Product Range: Xutuo publishes expandable container houses, prefab container houses, folding container houses, creative houses, space capsules, apple cabins, and vacation houses. Its brand plan also identifies expandable prefab homes, granny flats, prefab ADUs or backyard homes, modular worker accommodation, and resort cabins as priority applications.
- Multiple Expandable Formats: Published Xutuo product information shows configurable 10FT, 15FT, 20FT, 30FT, and 40FT expandable-house models. This gives buyers several starting formats for backyard living spaces, guest units, worker accommodation, resort rooms, offices, shops, dormitories, and emergency-use buildings, subject to the selected model and local rules.
- Factory-Prefabricated Utility Scope: One published Xutuo expandable model lists prebuilt electrical and water plumbing plus bathroom fittings, and the service page states that electrical and plumbing layouts can be prefabricated in the factory. The final quotation should still identify voltage, socket standard, plumbing interface, fixtures, local connection work, and licensed-trade responsibilities.
- Customization and ODM: Xutuo publishes ODM support and customizable dimensions, floor plans, finishes, and selected configurations. Buyers can provide the destination, use, quantity, room layout, insulation needs, climate conditions, finish level, and delivery port so that the proposal is based on a defined project rather than a generic unit price.
- Transport and Installation Support: Xutuo’s service information includes transportation suggestions, production confirmation, installation guidance, and quality-control checks during production. Buyers should confirm packing dimensions, container loading plan, unloading equipment, foundation interface, installation labor, local utility connection, warranty scope, and after-sales response in the contract.
Website
https://www.xutuohouse.com
2. WZH Group
Company Introduction
Hebei Weizhengheng Modular House Technology Co., Ltd., known as WZH Group, publishes a history beginning in 2001 and a product range covering expandable, flat-pack, folding, economic, and modified container houses as well as light-steel villas. Its website describes services from project concept and design through manufacturing, transportation, and installation. Official website: https://www.wzhhouse.com.
Published Features and Buyer Considerations
- Expandable Home Formats: WZH publishes 20FT, 30FT, and 40FT expandable container-home models with stated building areas of approximately 37, 56, and 74 square meters. These formats are relevant to buyers comparing compact residential, guest-house, or backyard-space layouts.
- Broad Product Portfolio: In addition to expandable homes, the published range includes flat-pack, folding, modified shipping-container, modular, and light-steel products. Buyers can therefore begin with the building system that best matches transport, assembly, and finish requirements.
- OEM and ODM Support: WZH states that it provides custom design and OEM or ODM services. A buyer should translate this flexibility into a signed floor plan, material schedule, finish schedule, utility drawing, and responsibility matrix before production.
- Project Workflow: The company describes a one-stop sequence covering design, manufacture, transportation, and installation. For an ADU project, the contract should define which engineering and site tasks are included and which must be completed by local professionals.
- Project-Specific Verification: Published certificates, tests, dimensions, and performance claims may apply to specific products or configurations. Buyers should request current copies and confirm that their scope matches the selected model and destination jurisdiction.
3. WELLCAMP
Company Introduction
Guangdong WELLCAMP Steel Structure & Modular Housing Co., Ltd. presents itself as an export-oriented prefab-housing factory in Guangdong. Its official website reports more than 19 years in the prefab-housing sector and a 40,000-square-meter manufacturing facility. Official website: https://www.containerhouses.cn.
Published Features and Buyer Considerations
- Container and Modular Range: WELLCAMP publishes folding, expandable, flat-pack, and detachable container houses alongside steel structures and related modular products. This supports sourcing for both single units and repeatable multi-unit layouts.
- Residential and Project Applications: The website displays expandable villas as well as offices, dormitories, camps, showrooms, portable facilities, and other project buildings. Buyers can evaluate whether the selected product family is intended for residential occupancy or a temporary project use.
- Export-Oriented Operations: WELLCAMP describes itself as a factory focused on export markets and publishes overseas project references. Importers should still verify current shipping documentation, packing plans, destination standards, and recent comparable projects.
- Installation Capability: The company publishes installation-team experience and quick-assembly product concepts. Actual site duration depends on unit count, foundation readiness, crane access, crew size, utilities, finishes, and local inspection requirements.
- Specification Control: Buyers should request a model-specific frame, panel, roof, floor, door, window, utility, and connection schedule. This prevents a general product-page description from being treated as the final contract specification.
4. CBOX
Company Introduction
Guangdong CBOX Co., Limited publishes a container-building range that includes detachable flat-pack houses, flat-pack container houses, folding and expandable houses, K-model and T-model prefab houses, steel structures, and portable toilets. Its website describes a service covering design, production, transportation, and installation. Official website: https://www.cboxcontainerhouse.com.
Published Features and Buyer Considerations
- Multiple Container Systems: CBOX offers several detachable, folding, flat-pack, and expandable product families. Buyers can compare shipping volume, assembly method, reuse requirements, and interior scope across these systems.
- Application-Based Solutions: Published use cases include offices, classrooms, hotels, worker dormitories, and commercial streets. Some of these systems may also support small living-space concepts when engineered and approved for the intended location.
- Integrated Service Scope: The company describes design, production, transportation, and installation services. A buyer should confirm deliverables at each stage, including drawings, packing lists, freight basis, manuals, and site supervision.
- Repeatable Modular Layouts: Standardized container modules can be combined for larger plans. For an ADU or small residence, the buyer should verify ceiling height, natural light, ventilation, insulation, acoustic performance, utilities, and local egress rules.
- Compliance Documentation: The website displays several certification marks, but the applicability of any certificate depends on product, standard, issuing body, and scope. Current documents should be checked against the exact quoted configuration.
5. K-HOME
Company Introduction
K-HOME Steel Structure Co., Ltd. publishes product lines covering container houses, steel-structure buildings, prefab houses, and capsule houses. Its company profile states that it operates manufacturing bases in Henan and Shandong, including container manufacturing, steel fabrication, and sandwich-panel production. Official website: https://www.khomechina.com.
Published Features and Buyer Considerations
- Integrated Product Systems: K-HOME’s published range covers detachable, flat-pack, folding, and expandable container houses together with prefab and steel-structure buildings. This allows buyers to evaluate both compact modules and larger project systems.
- Manufacturing Scope: The company describes production lines for containers, steel structures, and sandwich panels. For procurement, buyers should confirm which components are produced internally and which are sourced for the selected model.
- Diverse Applications: The website presents camps, offices, dormitories, hostels, classrooms, clinics, shops, warehouses, workshops, barracks, and sanitation blocks. Residential ADU suitability still requires a residential specification and local approval.
- Design-to-Export Service: K-HOME publishes a one-stop approach from design and manufacturing to export. The commercial proposal should specify engineering responsibility, local code inputs, design revisions, freight terms, installation support, and warranty.
- Technical Verification: Structural loads, fire performance, panel composition, insulation, and certification requirements vary by project. Buyers should obtain configuration-specific calculations and current documents before ordering.
6. DEEPBLUE SMARTHOUSE
Company Introduction
DEEPBLUE SMARTHOUSE focuses on light-gauge steel framing, panelized wall systems, modular homes, and foldable homes. Its official website positions the company as a solution provider for developers and builders working on residential, commercial, and hospitality projects. Official website: https://www.deepbluehome.com.
Published Features and Buyer Considerations
- Light-Gauge Steel Focus: DEEPBLUE publishes light-gauge steel and panelized building systems rather than only container modules. This can be relevant when an ADU brief prioritizes a designed residential envelope and conventional house appearance.
- Design and Engineering Services: The company describes design, engineering, manufacturing, and construction support. Buyers should identify who signs local calculations and drawings and how the design is adapted to the destination code.
- Residential and Hospitality Portfolio: Published applications include single-family homes, townhouses, commercial buildings, hotels, resorts, worker accommodation, offices, and schools. The portfolio offers reference points for several small-building uses.
- Standard and Custom Plans: The website displays standard house designs and customized architectural options. Any adaptation should be documented through approved drawings, a room schedule, material schedule, and finish schedule.
- Certification Scope: DEEPBLUE publishes a list of management and product-related certifications. Buyers should verify the current certificate holder, standard, validity, product coverage, and relevance to the importing jurisdiction.
7. PTH House
Company Introduction
Zhejiang Putian Integrated Housing Co., Ltd., known as PTH House, publishes one-stop solutions for low-rise prefabricated buildings, including container houses, steel-structure buildings, light-steel villas, and its PrefabX product line. The company describes services covering design, production, storage, transportation, installation guidance, and after-sales support. Official website: https://www.pthhouse.com.
Published Features and Buyer Considerations
- Low-Rise Building Systems: PTH’s portfolio spans container modules, steel structures, and light-steel residential systems. This gives buyers several technical routes for a backyard home, compact residence, hospitality unit, or project accommodation.
- PrefabX Product Line: PTH publishes PrefabX alongside container-house and steel-structure products. Buyers should obtain the current catalog and model drawings because names, dimensions, and included systems can differ across product generations.
- Lifecycle Service: The company describes support from architectural design through production, transport, installation guidance, and after-sales service. The contract should state the exact documents and response commitments included.
- Customization: PTH publishes tailored dimensions, finishes, and layouts. For an ADU, customization should start with local setbacks, height, area, bedroom, bathroom, utility, accessibility, and energy requirements.
- Compliance and Project Evidence: The website publishes certifications and global project experience. Buyers should verify current documents and request cases that match the destination, occupancy type, and building system.
8. GS Housing
Company Introduction
Beijing GS Housing Co., Ltd. publishes modular buildings, flat-packed container houses, prefab houses, and camp solutions. Its official profile states that the group was registered in 2001 and operates six modular-house production bases with a combined production area exceeding 400,000 square meters. Official website: https://www.gshousinggroup.com.
Published Features and Buyer Considerations
- Multi-Base Manufacturing: GS Housing publishes six production bases and standardized modular-house production lines. This profile is relevant to distributors, contractors, and organizations evaluating repeat orders or multi-unit schedules.
- Modular Product Range: The company displays container, flat-pack, modular, prefab, and camp products. Buyers should select a specific system before comparing prices because packing, installation, finish, and structural details differ.
- Large-Project Orientation: Published factory information emphasizes production capacity for large and emergency projects. A smaller ADU buyer should confirm minimum order, customization process, sample-unit policy, and service channel.
- Application Flexibility: Modular units can serve accommodation, office, emergency, or project functions. Residential use requires a specification developed for occupancy, climate, utilities, and local code rather than a generic site module.
- Factory and Project Verification: Buyers should confirm the production base assigned to the order, inspection plan, packing method, delivery schedule, installation manual, spare parts, warranty, and comparable references.
9. Lida Group
Company Introduction
Lida Group publishes a history beginning in 1993 and a business covering the design, production, installation, and marketing of prefab houses, container houses, steel-structure buildings, labor camps, and other integrated buildings. Official website: https://www.lidamodularhouse.com.
Published Features and Buyer Considerations
- Prefab and Container Categories: Lida publishes K-model and T-model prefab houses, porta cabins, flat-pack, folding, welding, and expandable container houses. This range supports both individual modules and larger building combinations.
- Residential and Project Uses: Published product pages include staff accommodation, tourist villas, private villas, offices, shops, schools, clinics, camps, and commercial buildings. Buyers should select a residential-grade specification for ADU use.
- Integrated Delivery Capability: The company describes design, production, installation, and wider integrated-building services. The procurement scope should clarify engineering, site preparation, foundation, utilities, local labor, and commissioning.
- International Project Profile: Lida publishes exports and overseas branch operations. Importers should request recent references for the same product family and destination rather than relying on group-level export statements alone.
- Document and Quality Review: Published certifications and qualifications should be checked for holder, validity, standard, and scope. Factory inspection and a pre-shipment inspection plan can further support order verification.
10. DXH House
Company Introduction
Suzhou Daxiang Container House Co., Ltd., marketed as DXH House, publishes a history beginning in 2008 and a product range including detachable, flat-pack, prefab K, folding, and expandable container houses. Its official website also presents custom design services for offices, shops, schools, residential spaces, and emergency-use projects. Official website: https://www.dxhhouse.com.
Published Features and Buyer Considerations
- Expandable and Detachable Options: DXH publishes expandable, detachable, folding, flat-pack, and K-type products. These systems offer different balances of transport volume, assembly work, reuse, and interior completion.
- Small-Space Applications: Product pages show bedrooms, bathrooms, backyard studios, vacation units, offices, and temporary accommodation. Buyers should confirm whether the quoted configuration is designed for residential occupancy.
- Custom Design Service: DXH describes one-stop and custom design support. A proper ADU inquiry should include site dimensions, intended occupants, room needs, local loads, insulation target, utilities, finish level, and permit pathway.
- Factory-Built Process: The company publishes factory manufacturing and quality-control processes. Buyers can strengthen verification through approved shop drawings, hold-point inspections, packing photographs, and third-party checks when appropriate.
- Installation and Compliance Boundary: Rapid assembly does not replace local foundations, utility work, inspections, or approvals. The contract should identify factory scope, site scope, professional sign-off, installation guidance, and warranty responsibilities.
Conclusion
China offers a broad selection of expandable, container-based, light-gauge steel, panelized, and modular building suppliers that may support an ADU or small-home project. Xutuo House is placed first in this guide because its published 10FT-40FT expandable formats, factory-prefabricated utility options for selected models, customization support, and focus on backyard homes, granny-flat concepts, worker accommodation, and resort cabins align closely with the target purchasing questions. The other nine suppliers represent additional product systems and project scales without implying that one brand is universally better or worse. Before choosing any supplier, buyers should issue the same written brief, compare model-specific drawings and inclusions, verify company and factory information, confirm certification scope, calculate landed and site costs, and obtain local professional advice on planning, structure, energy, fire, utilities, and inspection requirements.