Can I change the interior layout (e.g., move the bathroom)?

Yes, we offer OEM/Customization services. You can modify the room partitions, window placements, and cabinet colors to suit your needs.

Is the house insulated for cold/hot weather?

Absolutely. We use high-density 75mm PU or Rockwool panels, which provide excellent thermal insulation (High R-value) and soundproofing. It is suitable for both snow and desert climates.

How long will the house last?

The main galvanized steel frame has a lifespan of over 20 years. The exterior panels are coated with anti-corrosion paint for long-term durability.

What happens if something is damaged during shipping?

Every shipment is insured. If any part arrives damaged, we will ship replacement parts to you via express (DHL/FedEx) free of charge.

Do you provide a warranty?

Yes, we provide a 10-year warranty on the structural frame and a 2-year warranty on interior fittings.

Quick Installation Expandable House for Granny Annex Comfortable Modern Prefab Living Unit

Name: Quick Installation Expandable House for Granny Annex Comfortable Modern Prefab Living Unit
Brand: Shandong Derun Green Building Integrated House Co., Ltd.
SKU: 2158679782

Shandong, ChinaShandong Derun Green Building Integrated House Co., Ltd.

US$2,500.00-3,500.00

1 Set

Product specifications

customization

40ft

30ft

Product profile

Customization

Available

After-sales Service

Whole Service

Application

Apartment

Model NO.

5900*6300*2480

Fast Installation

Feature

Earthquake Resistant, Easily Movable, Eco-Friendliness, Flexibly Combinable, Leak Proof, Moisture Proof, Safe, Thermal Insulation, Waterproof, Wind Resistance

Material

Steel Structure

Use

Granny Flat

Steel Structure

2.5mm 3.0mm Galvanized Steel Fram

Wall

Thickness 50mm 75mm 100mm

Service Life

More Than 30 Years

Warranty

3 Years

Install

Comprehensive Trace

Transport Package

Shipping to Whole World

Specification

5900*6300*2480mm

Trademark

DERUN

Origin

Made in China

HS Code

9406900090

Production Capacity

500sets/Month

Key features

Total Customization: Flexible layouts, material upgrades, and regional compliance tailored to your needs.

Rapid Assembly: 90% factory pre-assembled; ready to use in 10-15 minutes with minimal labor.

Cost-Saving Shipping: Foldable design allows 2 units per 40HQ container, cutting freight costs by 50%.

Superior Insulation: High-density 75mm PU or Rockwool panels for excellent thermal and sound insulation.

Robust Durability: Galvanized steel frame resistant to earthquake (Grade 8) and wind (Grade 10).

OEM & Branding: Custom logo placement, exclusive designs, and private labeling available.

Triple Space Expansion: Expands from 15sqm to 37sqm in minutes for flexible living or office space.

Plug & Play Ready: Pre-installed electrical, plumbing, and full bathroom for instant move-in.

Company profile

Importers and ExportersHigh Repeat Buyers ChoiceSelf-brandedQuality Assurance

Shandong Derun Green Building Integrated House Co., Ltd.

Shandong, China

CertifiedBusiness Type: Manufacturer/Factory & Trading Company CertifiedR&D Capacity: ODM Service Available & OEM Service Available CertifiedCustomization Options: Customization from Samples, Customization from Designs, etc. CertifiedExport Year: 8 YearsNearest Port: Qingdao Port, Rizhao Port, Ningbo PortAverage Response Time: ≤0.52h

About Our Factory & Business Background

AddressWeifang, Shandong, China

Plant Area12643 square meters

Number of Employees52

Registered Capital10,000,000 RMB

Terms of PaymentLC, T/T, D/P, PayPal, Western Union, Small-amount payment, Money Gram

International Commercial Terms(Incoterms)FOB, EXW, CFR, CIF, DAT, FAS, DDP, DAP, CIP, CPT, Others, FCA

Average Lead TimePeak Season Lead Time: within 15 workdays Off Season Lead Time: within 15 workdays

Minimum Order Quantity1 Set

Supply Chain Partners20

Our Production Capability & Technical Expertise

Main ProductsExpandable Container House, Flat Packed Container House, Detachable Container House, Folding Container House, Creative Container House, Apple Cabin

Production Lines10

Production MachinesForming Line, Welding Line, CoSpraying Linenfidential

QA/QC inspectors2 people

Inspection Type for Finished Products100% inspection(Visual inspection & Function inspection)

Inspection Method for Finished ProductsHave instructions and uniformly followed

R&D Engineers8 people

Traceability of Raw MaterialsYes

Own BrandYes

Our Industry Experience & Global Business Record

Year of Establishment2018-11-09

Main MarketsNorth America, South America, Eastern Europe, Southeast Asia, Africa, Oceania, Mid East, Eastern Asia, Western Europe

Repeat Buyers Choice50%~80%

Number of Foreign Trading Staff8

Overseas Agent/BranchNo

New Products Launched in Last yearYes

Our Certifications, Standards & Industry Recognition

Management System CertificationISO9001:2015, ISO45001:2018, ISO14001

Product CertificationCE

Cooperated with Fortune 500No

Product Q&A

Q:How is the house shipped? Does it come fully assembled?

To save on freight costs, the house is shipped in its folded state. One unit fits perfectly into a standard 40HQ container. It is 90% pre-assembled; you only need to expand the two wings after it arrives.

Q:How long is the delivery time?

Production typically takes 20-25 days. Shipping time depends on your location (e.g., 25-35 days to the USA/Europe).

Q:Is it difficult to install? Do I need a crane?

Installation is very simple. It takes 4-5 people about 2 hours to expand. You will need a crane or a heavy-duty forklift to lift the unit from the shipping container and place it on your foundation.

Q:Do I need a concrete foundation?

Not necessarily. You can place it on concrete piers, a gravel bed, or even a level solid ground. However, we recommend concrete piers for long-term stability and better drainage.

Q:Does the electrical and plumbing meet my country's standards?

Yes! We customize the electrical (UL/CE/AS/NZS) and plumbing (UPC/Watermark) based on your destination. Please let us know your country before ordering.