National Door and Trim

What National Door and Trim does

National Door and Trim is a privately held, family-owned building products manufacturer and distributor headquartered in Van Wert, Ohio, with a second production facility in Lexington, North Carolina. Founded in 1967 as Turnwald Construction Inc. and rebranded to National Door and Trim in 1978, the company produces pre-hung, pre-finished, and fully customizable doors, frames, hardware, and moulding products for the commercial and residential construction markets. Its core technology centers on an automated finish line system (developed from founder Tom Sr. Turnwald's design) that delivers factory-applied finishes at a capacity of over 1,500 pre-hung doors per week, supported by over 150,000 square feet of production and warehousing across three locations.

The company operates a single-source supplier business model, bundling Division 6 (doors and frames), Division 8 (openings), and Division 10 (specialties) scopes into integrated packages for multi-family, student housing, and senior living developers, complemented by a residential channel at ndtresidential.com. Revenue is generated through project-based hardware and millwork sales with dedicated account managers; no public pricing or subscription model is disclosed. Distribution is direct via field sales and a structured pre-qualification process for new commercial clients and installers. The company holds long-standing vendor partnerships with leading manufacturers including Masonite Architectural, Allegion, Assa Abloy, Schlage, Ceco Door, Steelcraft, ThermaTru, and Metrie, which underpin its product breadth. Ownership and leadership remain with the Turnwald family across three generations, with operational executives including a President, COO, and a CFO with 34 years of tenure.

Name

National Door and Trim

Legal name

Turnwald Construction Inc.

Website

https://national-door.com

Company type

Private

Founded year

1967

Operating status

Operating

Headcount range

51–100 employees

Ownership category

akta.pro rank

Product category

Building Materials Manufacturing

NAICS

Metal Window and Door Manufacturing (332321), Wood Window and Door Manufacturing (321911)

SIC

Metal Doors, Sash, Frames, Moldings & Trim (3442)

akta.pro primary industry

Commercial & Industrial Doors (Sectional, High-Speed, Fire, Security) (IMADAIAF)

akta.pro secondary industries

Interior Doors (IMADAIAB), Exterior Doors (IMADAIAA)

Keywords

• Pre-hung doors
• Commercial door supplier
• Architectural millwork
• Door and hardware packages
• Moulding and trim

Headquarters

HQ city

Van Wert

HQ country

United States

HQ region

North America

Offices2 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Operations, Infrastructure, Personnel, Technology or R&D, Marketing or Sales

Revenue model

1. Commercial Door and Hardware Sales: One-time product sales of commercial doors, frames, and hardware to developers and contractors for multi-family, student housing, and senior living projects. Revenue generated through project-based transactions with Division 6, 8, and 10 product categories.
2. Residential Door and Moulding Sales: Product sales of interior doors, exterior doors, and moulding for residential construction and renovation projects.

Go-to-market motion1 record

Distribution channels2 records

Marketing channels3 records

Core offering

National Door and Trim is a manufacturer and supplier of pre-hung, pre-finished, and customizable doors, moulding, frames, and hardware for commercial and residential construction. The company acts as a single-source supplier delivering complete Division 6, 8, and 10 packages for multi-family, student housing, senior living, and single-family residential projects. It operates manufacturing and stocking facilities in Ohio and North Carolina, producing over 1,500 pre-hung doors per week with factory-applied finishes.

Product overview

National Door and Trim is a building materials supplier serving multi-family, student housing, and senior living markets. The company offers a comprehensive portfolio of door and moulding products through five core categories: Commercial Products (architectural doors, hollow metal doors and frames for Division 6, 8, and 10 needs), Interior Doors (molded and solid wood options), Hardware (commercial-grade and residential-grade), Exterior Doors (fiberglass and steel entry systems), and Moulding (hardwood, softwood, and MDF). They position themselves as a single-source supplier offering pre-hung door assembly, custom finishing, and inventory storage capabilities across over 150,000 square feet of facilities, producing over 1,500 pre-hung doors per week.

Differentiator

Problem solved

Functional benefit

Products and services

• Architectural Doors Wood commercial-grade architectural doors including flush doors, stile and rail, laminates, and impact-resistant options, built for demanding commercial environments.
• Hollow Metal Doors and Frames Durable hollow metal doors and frames in various gauges with fire ratings, glazing options, and custom borrowed lite designs for commercial applications.
• Molded Interior Doors Economical hollow and solid core molded interior doors available in paintable surfaces with bifold, modern, and barn door configurations.
• Solid Wood Interior Doors High-grade solid wood interior doors in paneled and glass configurations, available in stock or fully custom species, styles, and sizes.
• Fiberglass Exterior Doors Insulated fiberglass exterior doors with smooth or woodgrain textures, reinforced lock areas, and various panel and glass designs.
• Steel Exterior Doors Strong and affordable steel exterior doors with high-definition profiles, typically supplied as pre-hung units with sill systems ready for installation.
• Hardwood Moulding Natural wood mouldings offering texture and dimension, with hundreds of standard profiles plus custom matching and design capabilities.
• Softwood Moulding Softwood moulding solutions with smooth paint-ready finishes, trending designs, and high-quality material to avoid warping.
• MDF Moulding Engineered MDF interior finishing moulding with a uniform smooth surface free of knots, economical for intricate designs and paint projects.
• Commercial Hardware Commercial-grade hardware including electronic access control solutions, locks, and door hardware for high-use commercial environments.
• Residential Hardware Residential hardware offerings with multiple styles, finishes, and functionality options, including innovative security solutions for homes.
• Pre-Hung Door Assembly Factory-built pre-hung door units with jamb, trim, and hardware assembled, supported by a state-of-the-art finish line system capable of producing over 1,500 units per week.
• Fire-Rated Doors Warnock Hersey Mark-certified fire-rated doors, machined in-house by a certified fire-rated shop for projects requiring specific fire safety ratings.

Named customers10 records

Segments4 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature1 record

Partnerships

13 partnerships are on record, tiered core.

• Masonite ArchitecturalcoreTechnology or IntegrationPrimary vendor partner for architectural grade wood commercial doors and molded interior doors. Provides technical specifications and catalogs for product specification.
• AllegioncoreTechnology or IntegrationCommercial hardware partner providing access control, electronic solutions, and commercial-grade hardware. Technical support and product catalogs available.
• Assa AbloycoreTechnology or IntegrationOpening solutions and commercial hardware partner. Technical resources and product information provided for commercial applications.
• SchlagecoreTechnology or IntegrationResidential and commercial hardware including electronic access control. Technical support and product catalogs for specification.
• Ceco DoorcoreTechnology or IntegrationHollow metal doors and frames supplier for commercial applications. Technical resources and product literature available.
• SteelcraftcoreTechnology or IntegrationHollow metal door and frame products for commercial projects. Technical documentation and catalogs for product specification.
• ThermaTrucoreTechnology or IntegrationFiberglass exterior door systems. Technical specifications and inspiration literature for residential applications.
• De La FontainecoreTechnology or IntegrationHollow metal frames and doors supplier. Technical library available for commercial product specification.
• NGP (National Guard Products)coreTechnology or IntegrationCommercial hardware including door hardware and accessories. Product catalogs for specification.
• Dorma KabacoreTechnology or IntegrationCommercial door hardware and access solutions. Knowledge center and technical support available.
• BESTcoreTechnology or IntegrationCommercial grade hardware and access control. Support literature and product documentation.
• HagercoreTechnology or IntegrationDoor hardware and trim products. Resource library with catalogs and technical documentation.
• MetriecoreTechnology or IntegrationHardwood moulding and millwork products. BIM library and catalogs for specification.

Scale indicators4 records

Recent moves9 records

Expansion highlights5 records

Direct peers

• Marshfield DoorSystems: Wisconsin-based manufacturer of commercial architectural wood doors, including fire-rated and stile-and-rail products — directly comparable in commercial wood door manufacturing and specification-driven sales to ND&T's architectural door category.
• VT Industries: Iowa-based manufacturer of architectural wood doors, postformed countertops, and custom components serving commercial construction — comparable commercial door manufacturing capabilities and specification model.
• Trimlite: Manufacturer of interior doors, mouldings, and millwork serving residential and light commercial builders — directly comparable moulding and pre-hung interior door category to ND&T's residential line.
• Woodgrain Millwork: Idaho-based manufacturer of pre-hung doors, millwork, and moulding serving residential and commercial construction across North America — directly comparable product mix, distribution model, and customer base to ND&T.
• Algoma Hardwoods: Wisconsin-based manufacturer of hardwood stile-and-rail doors and architectural wood components — comparable custom interior and architectural wood door offering for commercial and residential customers.
• Eggers Industries: Wisconsin-based manufacturer of architectural flush wood doors, stile-and-rail doors, and custom millwork serving commercial and institutional construction — overlaps with ND&T's architectural and commercial door lines.

Broad incumbents

• Cornerstone Building Brands: Public building products manufacturer of exterior building products including doors, windows, and siding — broad incumbent with overlapping commercial and residential door categories, though serving a wider envelope of products beyond ND&T's specialty.
• Masonite: Global door manufacturer with deep commercial and residential door lines, including architectural and molded interior doors — ND&T is also a Masonite Architectural distribution partner, illustrating the incumbent–specialist relationship.
• Sierra Pacific Industries: Large vertically integrated wood products manufacturer producing windows, doors, and millwork — broad incumbent with comparable door and millwork manufacturing capabilities, though operating at substantially larger scale.
• JELD-WEN: Global manufacturer of windows, doors, and millwork across residential and commercial segments — a broad incumbent whose product portfolio (interior, exterior, commercial, moulding) directly overlaps with ND&T's full catalog, though at significantly greater scale and geographic reach.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks7 records

Key highlights7 records

Customer concentration

Revenue estimate

Valuation estimate

Number of profiles

Profiles5 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about National Door and Trim