Interior Commercial Doors Built for Project Volume
EUWOO manufactures interior commercial doors for office fit-outs, hotels, healthcare corridors, and institutional buildings. Lighter gauge where it makes sense, mineral wool acoustic core where it doesn't, and a powder line that holds color across your entire batch.
What Makes an Interior Commercial Door Different from the Rest of the Line
Interior commercial doors occupy a specific position in the commercial door category — and getting the spec wrong in either direction costs you.
Over-spec with heavy-gauge industrial construction and you're adding freight weight and unit cost that your downstream buyers won't pay for. Under-spec with residential-grade hollow core and you're generating warranty claims from hotel operators and facility managers within 18 months.
The interior commercial door sits between those two failure modes. The body gauge runs 0.8–1.0mm SPCC cold-rolled steel — sufficient for the cycle loads and impact profiles of office corridors, hotel guest floors, and healthcare wings, without the weight penalty of industrial-grade construction.
The frame runs heavier, at 1.2–1.5mm, because the frame is what the building opening sees for the life of the installation. We don't match frame gauge to leaf gauge on interior doors; the frame takes the abuse from door stops, cart impacts, and hardware stress, and it needs the extra material.
Core Fill: Where Interior Doors Earn Their Keep
Standard honeycomb paper core keeps weight and cost down for applications where sound transmission isn't a spec requirement. Mineral wool fill — used on all acoustic-rated configurations — brings the assembly to STC 32–38 depending on door thickness and seal specification.
STC Tested on the Complete Assembly
That range covers most commercial building acoustic requirements for office partitions, hotel guest rooms, and healthcare consultation rooms. We test STC on the complete assembly — door leaf, frame, and perimeter seals together — not just the leaf in isolation. An STC rating on a leaf-only test is meaningless once the door is installed with gaps at the threshold.
Heavy-gauge industrial construction adds freight weight and unit cost your downstream buyers won't absorb. Wrong tool for interior applications.
0.8–1.0mm body gauge, 1.2–1.5mm frame, mineral wool acoustic core where required. Engineered for the cycle loads and impact profiles of commercial interiors.
Residential-grade hollow core generates warranty claims from hotel operators and facility managers within 18 months. Not built for commercial cycle loads.
Technical Specifications
These are industry-standard values for this product type. Actual specifications may vary by configuration — contact us for detailed product data sheets.
| Parameter | Standard Value / Range |
|---|---|
| Body material | Cold-rolled SPCC steel |
| Body gauge | 0.8mm / 1.0mm (1.2mm available for high-traffic corridors) |
| Frame gauge | 1.2mm – 1.5mm |
| Door thickness | 40mm / 45mm / 50mm |
| Standard leaf width | 700mm – 1000mm (single leaf) |
| Standard leaf height | 2000mm – 2400mm |
| Custom sizing | Available on runs ≥ 100 units; non-standard dimensions handled on press brake without tooling surcharge |
| Core fill | Honeycomb paper (standard) / Mineral wool (acoustic-rated) |
| Acoustic rating | STC 32–38 (mineral wool core, complete assembly) |
| Surface finish | Powder coat, 60–80μm; 60+ standard colors; primer-only available |
| Hardware prep | ANSI, EN, AS/NZS mortise and cylindrical lock prep; vision panel cutout available |
| Hinge prep | Standard 3-hinge prep; 4-hinge available for taller or heavier configurations |
| Fire rating | FD30 / FD60 available on applicable configurations |
| Certifications | ISO 9001:2015 CE SGS |
| MOQ | 50 units (standard) / 100 units (custom configurations) |
Key Spec Highlights
Where Interior Commercial Doors Move: Market Segments Worth Building Into Your Line
Interior commercial doors move across four high-volume segments — each with distinct spec drivers, order sizes, and repeat purchase logic. Understanding where your downstream customers operate determines which configurations to stock and which certifications to lead with.
Office Fit-Out & Commercial Real Estate
The highest-volume segment for interior commercial doors. A mid-size office tower fit-out runs 150–400 interior doors across tenant floors, service corridors, and common areas.
Key Spec Driver
Finish consistency — architects and fit-out contractors specify a color and expect every door in the batch to match. Our automated powder line holds ΔE < 1.5 across a full production run — the number that matters when your client is comparing door 1 to door 347 on a punch list walkthrough.
Distributors supplying fit-out contractors in this segment see repeat orders as tenants turn over and buildings refresh — it's not a one-time project sale.
Hotel & Hospitality Construction
A 200-room hotel typically specifies 250–350 interior doors across guest rooms, corridors, back-of-house, and service areas. Projects run on tight schedules with no tolerance for late supply.
Key Spec Driver
Acoustic performance — STC 32+ is the baseline for most hotel brand standards. Guest room doors also need a finish that holds up to housekeeping cart impacts and daily cycling. Our mineral wool acoustic core and EPDM perimeter seals satisfy hotel brand QA requirements without pushing into fire door pricing territory.
Most hotel projects in the Middle East and Southeast Asia that come through us specify the 45mm door with mineral wool core — the sweet spot between acoustic performance and freight cost.
Healthcare Facilities
Hospitals, clinics, and aged care facilities specify interior commercial doors in volume and to tighter tolerances than most other segments. Corridor doors in active wings cycle 150–300 times per day.
Spec Requirements
- 1.0mm body gauge minimum
- 4-bearing hinges
- Continuous EPDM perimeter seal
- Vision panel options for patient room doors
- Antimicrobial powder coat finishes (on request)
Healthcare procurement runs through approved vendor lists. Our ISO 9001:2015 and CE certifications are the entry tickets for most institutional procurement processes.
Educational Buildings
Schools, universities, and student accommodation order interior commercial doors in predictable annual cycles tied to construction and renovation budgets. A secondary school project runs 100–300 doors; a university dormitory block runs 200–500.
Standard Spec
0.8–1.0mm body, standard acoustic core, durable powder coat finish in institutional colors. Straightforward spec — the commercial logic is the repeatability.
A distributor on an approved vendor list sees orders year after year from the same district or institution. Education construction follows budget cycles — predictable demand, predictable margins.
Acoustic Performance: How We Engineer It In
Acoustic performance in an interior commercial door isn't a single-component spec — it's a system result. The STC rating of the complete assembly depends on four variables working together. Getting one wrong degrades the whole number.
Four Variables That Determine STC Rating
Core Fill Density
Mineral wool at 80–100 kg/m³ — the engineering sweet spot. Below 80 kg/m³ and you're not getting meaningful sound attenuation; above 100 kg/m³ and you're adding weight without proportional acoustic gain.
Door Thickness
45mm is the standard acoustic configuration. Thickness directly affects mass law attenuation — thicker leaf, higher STC ceiling.
Perimeter Seal Compression
EPDM compression type, continuous on all four sides. Seal compression must be consistent around the full perimeter — any gap creates a flanking path that bypasses the core entirely.
Threshold Seal Continuity
The variable most suppliers get wrong. An interrupted threshold seal, or one undersized for the door's operating weight, drops the STC rating by 4–6 points in field conditions versus the lab test.
Dual-Purpose Core: Acoustic + Fire Rating
The mineral wool fill also contributes to FD30 and FD60 fire ratings on applicable configurations. A single door spec can satisfy both acoustic and fire compartmentation requirements — useful for healthcare and hospitality projects where both apply. One spec, two compliance boxes ticked.
Threshold Seal: Sized to Door Weight
We size the threshold seal to the door weight and test the complete assembly — not just the leaf. If your downstream customers are specifying STC ratings for compliance purposes, this is the detail that determines whether the installation passes or fails the acoustic test.
Field Failure Case
We've had buyers come to us after a competitor's doors failed an acoustic compliance test on a hotel project — the doors themselves were fine, but the threshold seals were undersized. The fix required replacing seals on 180 doors after installation. That's the kind of after-sales cost that ends supplier relationships.
Acoustic Performance Summary
STC 32+
Hotel brand standard baseline for guest room doors
80–100
kg/m³ mineral wool density — engineered sweet spot
4–6 pts
STC drop from undersized threshold seal in field conditions
FD30/60
Fire ratings available on acoustic configurations
Relevant Products
Finish Consistency Across Large Batches — Why It Matters for Your Downstream Clients
Color consistency across a large interior door order is a more commercially significant spec than most buyers realize until they've had a problem with it.
A fit-out contractor installing 300 doors across 15 floors will notice batch-to-batch color variation. A hotel operator doing a punch list walkthrough will flag it. The result is a warranty claim, a re-coating job, or a relationship problem — all of which land on you before they land on the factory.
Our automated electrostatic powder coating line applies 60–80μm consistent thickness across the entire production run. The pre-treatment sequence — phosphate conversion coating, weld seam grinding and re-treatment, full wash cycle — is the same for every door regardless of batch size.
Color consistency is measured at ΔE < 1.5 across the run, which is tighter than most manual coating operations can hold. For custom RAL or proprietary brand colors, we do a color match sample before committing the production run — you approve the sample, then we coat the batch to that standard.
Coating Thickness
60–80μm applied uniformly via automated electrostatic line — consistent across every unit in the production run, not just the first pallet.
Color Tolerance
ΔE < 1.5 across the full production run. Tighter than most manual coating operations. Custom RAL colors approved by sample before batch commitment.
Pre-Treatment Sequence
Phosphate conversion coating, weld seam grinding and re-treatment, full wash cycle — identical for every door regardless of batch size.
Stocked Institutional Colors
For interior commercial doors going into office and hospitality projects, we stock the most common institutional colors with no MOQ premium.
Custom Brand Colors
Custom colors available on runs of 100+ units. For hotel chains or product lines with a proprietary brand color, we hold that color in our system for repeat orders.
Customization Options for Interior Commercial Doors
Interior commercial doors have more configuration variables than most other lines in our catalog, because the end applications vary significantly in their requirements. Here's what's adjustable and what the constraints are.
Dimensions
Standard leaf widths run 700–1000mm; heights run 2000–2400mm. Non-standard dimensions — wider openings for accessible entrances, reduced heights for mezzanine applications, oversized configurations for double-leaf sets — are handled on our press brake.
Core Fill
Honeycomb paper (standard, lower cost) or mineral wool (acoustic/fire-rated). The mineral wool option adds approximately 15–20% to unit cost but opens the door to acoustic-spec projects and fire-rated applications.
Vision Panels
Glazed vision panels in standard sizes (150×600mm, 200×800mm) or custom cutouts. Glazing options include clear tempered, wired glass (for fire-rated applications), and laminated safety glass. Most common customization on healthcare and education projects.
Hardware Prep
ANSI, EN, and AS/NZS mortise and cylindrical lock prep. Closer prep (surface-mounted and concealed), coordinator prep for double-leaf sets, and electric strike prep for access-controlled openings are all available.
Surface Finish
60+ standard powder coat colors, primer-only for field painting, or stainless steel face sheet for healthcare and food-adjacent applications. Custom RAL colors on runs of 100+ units.
Branding
OEM brand plates, custom packaging, and private-label documentation available for distributor partners. Most of our North American and Australian distributor partners run our doors under their own brand.
Double-Leaf Interior Door Sets
For double-leaf interior door sets, MOQ is 100 units — the coordinator and astragal hardware prep adds complexity that makes smaller runs uneconomical for both sides. Tell us the hardware standard for your target market and we'll prep accordingly.
We'll confirm feasibility and pricing within one business day.
Installation Considerations That Affect Your Total Cost of Ownership
Shipping configuration, on-site assembly, and frame anchoring decisions all feed directly into your landed cost and after-sales risk. Here's what to factor in before you commit to a configuration.
KD Flat-Pack vs. Pre-Hung Assemblies
Interior commercial doors ship KD (knocked down) flat-pack as standard — door leaf, frame sections, and hardware packaged separately. A 40HQ container loads approximately 450–550 standard single-leaf interior doors in flat-pack configuration, depending on door thickness.
Pre-hung assemblies (door pre-hung in frame, hardware installed) are available and reduce on-site assembly labor, but cut container loading density by 30–35%. The right choice depends on your market's labor cost profile — in markets with high installation labor costs, pre-hung assemblies often make economic sense despite the freight efficiency trade-off.
Container Loading Comparison
| Configuration | 40HQ Capacity | Labor Impact |
|---|---|---|
| KD Flat-Pack | 450–550 doors | Higher on-site assembly |
| Pre-Hung Assembly | 30–35% fewer units | Reduced on-site labor |
Best choice depends on your market's labor cost profile. High labor cost markets often favor pre-hung despite the freight trade-off.
Rough Opening Tolerance
Frame installation requires a prepared rough opening with ±3mm tolerance on width and height. We supply installation instructions and hardware templates with every order.
For project contractors who need on-site technical support, we can provide installation documentation in English, Arabic, and Bahasa Indonesia — the three languages that cover most of our active export markets.
Frame Anchoring in Lightweight Partition Walls
One detail that generates disproportionate after-sales issues: door frame anchoring in lightweight partition walls. Standard commercial door frames are designed for masonry or steel stud rough openings.
In lightweight drywall partitions, the frame anchor points need to hit the stud framing — if they don't, the frame works loose under door cycling and generates alignment complaints within 6–12 months.
We include anchor point guidance in our installation documentation, but it's worth flagging to your downstream customers before installation begins.
Certifications and Compliance
Our interior commercial doors carry the certifications your procurement process requires — from ISO quality management through fire-resistance testing to market-specific compliance documentation.
ISO 9001:2015
QMSManufactured under ISO 9001:2015 quality management certification. SGS audit reports available on request for buyers who need third-party verification for their own procurement processes.
CE Marking
EUCE marking covers the European market. For fire-rated configurations (FD30/FD60), CE marking covers the essential requirements of the Construction Products Regulation for fire-resistance performance.
EN 1634-1
FireFire-rated door assemblies (FD30/FD60) are designed to comply with EN 1634-1, the European fire resistance testing standard. For UL listing on specific fire-rated configurations, contact us for current listing documentation.
NFPA 80
NANFPA 80 certification (held at the company level) covers fire door assembly standards for North American projects. Contact us for current UL listing documentation on specific fire-rated configurations.
Healthcare & Education: Material Safety
For healthcare and education projects in markets with specific material safety requirements — VOC limits, formaldehyde emissions — our powder coat finish is zero-VOC post-cure and complies with standard commercial indoor air quality requirements.
Documentation available on request. Specify your target market's applicable standard when requesting compliance documentation so we can match the correct test report to your requirement.
Documentation Available on Request
- SGS audit reports — third-party verification for procurement processes
- CE Declaration of Performance — fire-rated and standard configurations
- UL listing documentation — specific fire-rated configurations, North American projects
- VOC / formaldehyde compliance — healthcare and education market requirements
- Installation documentation — English, Arabic, and Bahasa Indonesia
Frequently Asked Questions
Specification and procurement questions we hear from architects, hotel procurement teams, and commercial door distributors — answered with the technical detail you need to make the right call.
What steel gauge should I specify for interior commercial doors in a hotel or office building?
For standard hotel guest room and office corridor applications, 0.8mm SPCC cold-rolled steel is the appropriate body gauge — it meets the cycle load and impact profile of these environments without the weight and cost penalty of heavier gauge.
For high-traffic corridors — hospital wings, school hallways, back-of-house hotel service corridors — move to 1.0mm body gauge. The frame should always run heavier than the leaf: we use 1.2–1.5mm frame steel on all interior commercial door configurations.
The gauge jump from 0.8mm to 1.0mm body adds roughly 6–10% to unit cost but eliminates panel denting complaints in high-traffic applications.
What STC rating do I need for hotel guest room doors?
Most international hotel brand standards require STC 32–35 for guest room corridor doors. Premium and luxury brands often specify STC 38–42, which requires a thicker door assembly (50mm) with high-density mineral wool core and continuous perimeter seals.
For budget and mid-scale hotels, STC 32 on a 45mm door with mineral wool core and EPDM perimeter seals is the standard spec that satisfies brand QA requirements.
Critical installation note: The threshold seal is the variable that most often causes field installations to fall short of the lab-tested STC rating. Specify a continuous threshold seal and confirm it is sized for the door weight.
Interior commercial doors vs. hollow metal commercial doors: which is right for my project?
Hollow metal (HM) is a construction standard (ANSI/SDI A250.8) used primarily in North American institutional and commercial construction. Interior commercial doors built to hollow metal standards are the right spec for North American projects where the general contractor or specifier will ask for ANSI/SDI compliance documentation.
For projects outside North America — Middle East, Southeast Asia, Australia, Africa — standard interior commercial doors at equivalent gauge are functionally identical and typically more cost-competitive, since the ANSI/SDI compliance documentation adds cost without adding value in markets that don't require it.
Specify hollow metal with ANSI/SDI A250.8 documentation when GCs or specifiers require compliance paperwork.
Standard interior commercial doors at equivalent gauge with CE documentation — functionally identical, more cost-competitive outside North America.
If you're selling into both markets, we can supply the same physical door with ANSI/SDI documentation for North American orders and standard CE documentation for other markets.
What is the minimum order for custom-sized interior commercial doors?
MOQ for custom dimensions is 100 units. Non-standard widths, heights, and unusual aspect ratios are handled on our press brake without dedicated tooling on runs of 100 units or more.
| Dimension Type | MOQ | Notes |
|---|---|---|
| Custom dimensions | 100 units | Non-standard widths, heights, unusual aspect ratios — handled on press brake, no dedicated tooling required at this run size |
| Custom <100 units | Case-by-case | Still possible — tooling economics discussed upfront; small tooling charge may apply in some cases |
| Standard catalog dimensions | 50 units | 700–1000mm wide, 2000–2400mm tall |
Below 100 units, custom sizing is still possible but we'll discuss the tooling economics upfront — in some cases a small tooling charge applies.
How do I prevent interior commercial door finish from fading or delaminating in a humid climate?
Powder coat failure on interior doors in humid climates almost always starts at weld seams, not on flat panel surfaces. The fix is in the pre-treatment: weld seams need to be ground flush and treated separately before the phosphate wash, because the heat-affected zone from welding reduces adhesion. For interior applications in high-humidity environments (Southeast Asia, coastal Middle East), specify a zinc-rich primer undercoat before the topcoat powder — this adds a sacrificial corrosion barrier that extends coating life significantly. Ask your supplier specifically about their weld pre-treatment process. If they can't describe it in detail, the coating process probably isn't adequate for your market.
What lead time should I plan for interior commercial door orders?
Standard catalog configurations: 25–35 days from confirmed order to shipment. Custom configurations (non-standard dimensions, custom colors, vision panel cutouts, special hardware prep): 35–45 days.
These ranges assume normal line loading — for large orders (500+ units), confirm lead time at the time of inquiry since production scheduling affects availability. Sample orders (2–4 units) ship faster; contact us for current sample lead times.
Related Products in the Commercial Door Line
If interior commercial doors aren't the right fit for your project, these lines may be:
Office Commercial Doors
Designed specifically for corporate fit-out: clean profiles, vision panel options, compatible with standard office hardware prep. Narrower spec range than interior commercial, optimized for open-plan office environments.
View LineHollow Metal Commercial Doors
ANSI/SDI A250.8 construction standard; the required spec for North American institutional projects where compliance documentation is mandatory.
View LineSliding Commercial Doors
Top-hung and bottom-track configurations for space-constrained interiors where swing clearance is a problem.
View LineSecurity Commercial Doors
Anti-pry, anti-drill, multi-point locking for interior applications where access control is a project requirement.
View LineStart with a Sample Order
Most buyers sourcing interior commercial doors for the first time — or switching suppliers after a quality issue — start with 2–4 units across the configurations they're considering. It's the fastest way to test acoustic performance, finish quality, and hardware fit against your own project spec or your customers' requirements before committing volume.
Send us your target market, the configuration you're evaluating (gauge, core fill, finish color, hardware prep standard), and your rough volume expectations. We'll send back a detailed quote with CAD drawings and a sample lead time within 3 business days.
What to Include in Your Inquiry
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Target Market The end-use segment you're supplying — hospitality, healthcare, education, office fit-out, or other.
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Configuration Gauge, core fill, finish color, and hardware prep standard you're evaluating.
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Volume Expectations Rough order quantities so we can size the quote and lead time accurately.
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