The Five Key Advantages of Our Flush Doors
- Weight categories ranging from 25 kg to 50 kg, eliminating the risk of structural load on walls
- By using the filling method we provide, the rework rate can be reduced by 90%
- 20 noise-reduction measures to resolve 80% of noise complaints
- The product’s internal filling is highly consistent with the sample
- By applying the correct fill rate, the repurchase rate increased by 10%
Flush Door Manufacturing Solutions for Cost and Performance Control
We have partnered with eight key core material suppliers to offer three core structures and over ten types of filling materials, with a customisable hollow ratio ranging from 10% to 60%. We will match you with the most suitable interior door core solution based on your project budget, helping you to avoid rework and customer complaints resulting from the wrong choice of core material.
Send your project specs, get a custom core solution in 24 hours.
Flush Door by Core Hollow Rate
Choose the right flush door based on your project’s budget and performance needs.
Hollow ratio: 50%–60%
- Save 5%–10% on total procurement costs
- Lightweight for easy installation
Best for: Budget hotels, rental properties, temporary buildings
Hollow ratio: 5%–50%
- Reduce 80% of noise complaints
- 5%–8% better warping resistance than hollow-core flush doors
Best for: Apartments, offices, mid-range hotels (80% client choice)
Hollow ratio: <5%
- 10%–15% better warping resistance than semi-solid flush doors
- Superior sound insulation and durability
Best for: Luxury villas, high-end residential, 5-star hotels
8 Ways Our Flush Doors Fix Your Biggest Project Headaches
No more warping, noise, or delays
Save 5%-10% total costs
10%-15% better anti-warp
Cut 80% noise complaints
Fit all project types
25-50kg, no wall overload
Improved sound insulation for interior spaces
Sample = mass production
20-day delivery guaranteed
3 Processes Ensure the Flatness of the Flush Door
Flush doors are a type of minimalist interior door, so the flatness of the door leaf is of the utmost importance. We ensure the flatness of the flush doors you purchase through random checks of raw materials and mandatory inspections throughout the production process.
We rigorously screen our suppliers, and we also carry out spot checks on the filling materials they supply.
We carry out two inspections on flush doors during the production process: the first before the edges are sealed, and the second before packaging.
Through a process involving one random inspection and two mandatory inspections, we ensure the surface flatness of the flush doors, thereby reducing the risk of customer complaints and returns.
A Flush Door Designed Specifically for Villas
The door leaf thickness for flush doors ranges from 50 to 55 millimetres. When you use a 55 mm thick door with a hollow core ratio below 5%, you get 5–8% better sound insulation compared to standard doors. You can also opt for a 35-millimetre-thick door frame and four load-bearing hinges, which virtually eliminate the risk of the door leaf sagging, thereby reducing noise complaints and 90% of after-sales issues. This is the ideal choice for your high-end residential property, designed specifically for villas.
Free Resources to Help You Choose the Right Flush Doors
See all 10+ filling materials, sizes, and specs. Find the exact option that fits your budget and performance needs.
Watch side-by-side tests of rubberwood vs chipboard vs standard timber. Learn their pros, cons, and best uses in 3 minutes.
Get a tailored core structure that balances cost, weight, and sound insulation perfectly for your unique project.
WanBaoYiJia: Your Trusted Flush Door Partner
We are a one-stop provider of swing door solutions, working with eight core material suppliers to offer over 10 types of core materials and custom void ratios ranging from 10% to 60%. We tailor solutions precisely to your budget and requirements, with a reliable 20-day lead time, helping you avoid rework, noise complaints, and delivery delays. We have served clients in over 30 countries worldwide.
Custom Flush Door Solutions for Every Industry
We engineer tailored solutions to solve your unique project challenges, whether it’s load-bearing limits, tight budgets, strict soundproofing needs, or premium quality requirements.
An office fit-out contractor needed 2.55m tall doors for a modern building with only 11cm thin walls that couldn’t support heavy door panels. We engineered a custom aluminum honeycomb core paired with a solid rubberwood frame, reducing each door’s weight to just 30kg. The doors installed perfectly without any structural stress, and the project reported zero warping or sagging after 12 months of daily use.
A major African property developer required 230 sets of affordable doors with an urgent 18-day turnaround for a residential complex. We delivered chipboard core doors with a 40% hollow rate and 10% hollow door frames. This solution cut their total procurement costs by 10% while meeting all functional requirements. All units shipped on schedule, and the included hardware exceeded their quality expectations.
A healthcare facility construction project needed solid-feeling doors that wouldn’t overload their partition walls. The original 65kg solid-core design was too heavy for installation. We recommended a 15% hollow rate sound-absorbing core, reducing weight to 50-55kg while maintaining 5-8dB better sound insulation than standard semi-solid doors, eliminating both installation issues and noise complaints.
For high-end private villa developments where quality and user experience are non-negotiable. We offer an upgraded 55mm solid rubberwood core with 4 heavy-duty hinges. This design eliminates door sagging completely, improves sound insulation by an extra 5%, and delivers a premium solid closing feel. It reduces long-term maintenance costs by 15% and significantly boosts end-user satisfaction.
Flush Door Factory Visits
Customers meet our team, visit the workshop, and look at door samples.
Visitors speak with our team beside stacked materials in the storage area.
A visitor and our team examine a door surface on the workshop floor.
Complete Flush Door Guide for Your Project
Helping you choose the right core, understand the details, and reduce project risk.
- Product Specifications
- After-Sales Service
- Product Details
- Choose the Right Core for Your Project
- Why Work With Us？
All sizes, cores, and hollow rates are fully customizable to your project’s budget and performance needs.
| Item | Specification |
| Door Type | Flush Door |
| Door Leaf Thickness | 45 / 50 mm |
| Standard Size | 2100 mm (H) × 900 mm (W)× 160mm（T) |
| Size Customization | Available |
| Core Type | Hollow / Semi-Solid / Solid |
| Core Structure | Wooden Strip Filling |
| Filling Ratio | 30% – 100% (Based on Requirement) |
| Surface Finish | Painted / Melamine / Veneer |
| Color Options | Custom Colors Available / Color Matching Supported |
| Door Frame Material | Rubber Wood / Solid Wood |
| Frame Thickness | 30–35 mm |
| Sound Insulation | Optional |
| Moisture Resistance | Suitable for Interior Use |
| Hardware | Locks, Hinges, and Accessories Available |
| Application | Residential / Hotel / Apartment / Project Use |
1. If quality issues occur, we confirm with photos/videos and respond within 24–48 hours.
2. For confirmed defects, we provide replacement, compensation, or on-site support.
3. We offer free installation guidance to avoid mistakes and reduce your on-site risks.
View real product details, core structures, filling materials, and finished door effects.
| Type | Structure | Cost | Best For | Your Benefits |
| Hollow | Paper Honeycomb | Low | Budget hotels, rentals | Save 5%-10% cost, lightweight |
| Semi-Solid | Mixed Filling | Medium | Apartments, offices | Reduce 80% noise complaints |
| Solid | Full Wood | High | Villas, high-end projects | Zero sag, best durability |
- 10%–60% customizable hollow rates & 10+ filling materials for ANY project
- Stable 20-day lead time to keep your project on schedule
- Serve 30+ countries with proven project experience
- Sample structure 100% consistent with mass production
- Avoid rework, complaints, and budget overruns
Trusted Flush Doors for Global Projects
Solutions for Extra-high Flush Doors
We purchased 23 sets of flush doors for our office last year. And I am very satisfied with them. Our office doorways are quite tall, measuring approximately 2.55 metres in height and 0.98 metres in width. The walls are very thin, only 11 centimetres thick, so they lack load-bearing capacity.
Consequently, they proposed a solution featuring an aluminium honeycomb core and a rubberwood frame. When we visited the factory to inspect the goods, we found that the 2.5-metre-high door panels weighed around 30 kilograms, which our walls were perfectly capable of supporting.
I think they are very professional.
David MillerProcurement ManagerCost-Effective Flush Door Solution for Large-Volume Africa Project
Our project is in Africa, and we need a batch of very inexpensive wooden doors. We also require a quick turnaround.
The solution they offered us is: flat door panels + chipboard filling + hollow door frames. The door leaf has a hollow core of approximately 40%, whilst the door frame is 10% hollow. I’m quite satisfied with this, mainly because of the low price.
We’re ordering 230 sets of wooden doors, with dispatch scheduled for 18 days from now – I consider that to be quite a fast turnaround.
The locks they’ve provided are better than I’d expected.
Ahmed HassanProject DirectorHeavy Door Problem Solved (65kg → 55kg)
I saw their video two years ago and got in touch with them. Last year, I had a construction site where I needed to order 133 sets of wooden doors. My client requested solid-core door panels that were 55 cm thick, with the largest panel reaching 1.2 meters in width.
They told me that these panels would weigh 65 kilograms each, which I thought was too heavy and difficult to install. So, following their recommendation, I opted for soundproof panels with a hollow core ratio of about 15%. The soundproofing turned out to be quite effective, and the weight was reduced to just 50–55 kilograms.
In the end, they helped me transport the doors to Foshan for container consolidation, and I was very satisfied with their service.
Carlos RodriguezPurchasing ManagerSolving High Installation Cost with Pre-Assembled Doors
I’m in charge of procurement and construction. This year, I placed an order for 32 sets of wooden doors with them. Since installation costs are very high here, I asked them if there was a solution.
They proposed to pre-assemble the door frames and door panels at the factory before shipping them. After comparing the shipping costs and installation fees, I decided their plan was feasible.
For the door panels, I opted for the rubberwood-filled design. I wouldn’t be able to move them once they were assembled with the frames.
Michael ThompsonConstruction ManagerInstallation Team Confirms Solid Core Door Quality
My project is in Southeast Asia, and I needed solid wood doors. When the doors arrived at my construction site, I weighed them and found that each door panel averaged 45 kilograms, so I assumed they were solid. I asked our installers, and they said the doors sounded very solid when tapped, and they were also very heavy to move during installation, so the door panels should indeed be solid.
Daniel WeberProject Manager
A flush door is a smooth, flat door without extra carvings. Its quality mainly depends on the inner core.
It has a solid wood frame around, with different materials filled inside. We divide them into 3 types:
Hollow core: hollow ratio > 50%
Semi-solid core: 5% ≤ hollow ratio < 50%
Solid core: hollow ratio < 5%
The main differences are weight, sound insulation and durability.
Lower hollow rate means a heavier door, better soundproofing, and longer service life.
You can choose based on your project budget and performance needs.
About 50%–60% of a door’s weight comes from the filling.
For standard 2000×900 mm doors, every 10% higher hollow rate reduces weight by 2–3 kg and price by 3%–5%.
We support custom hollow rates from 10%–60% to fit your project.
For hotels & commercial projects, we recommend semi-solid doors (5%–50% hollow rate) – good sound insulation at a reasonable cost.
For high-end residential, solid core doors (<5% hollow rate) are the best choice to avoid complaints and rework.
Yes. With proper frame, veneer, and edge sealing, hollow core doors can last about 20 years for normal interior use.
We use 8mm veneer, double frame, and PUR sealing to make them even more durable for your project.
Related Products
Panel doors offer multiple construction and material options, helping buyers match decorative designs with project budgets.
Molded panel doors add visual depth while supporting consistent designs and selectable core options for project orders.
Glass doors balance natural light, privacy and security with tempered glazing options for varied interior projects.
Solid core doors provide stable, durable construction with selectable finishes for hotels, apartments, offices and residential projects.
Painted doors combine smooth engineered-wood surfaces with custom colors for coordinated apartment and hotel projects.
Melamine doors provide wear-resistant decorative finishes and configurable cores for hotel, apartment and commercial projects.
